Navegação Eventos - Resumos por autor "1103"

Classificar por: Ordenar: Resultados:

  • IPEN-DOC 29596

    SANTOS, PAULO R.S.; JESUS, ASHELY A.S.S. de; LIMA, WILLIAM B. de; COSTA, ISRAEL F.; FAUSTINO, WAGNER M.; FELINTO, MARIA C.F.C. ; TEOTONIO, ERCULES E.S.; BRITO, HERMI F.. Complex of luminescent europium containing bis(diphenylphosphine)oxide ligands. In: SILVA, FERNANDO de C. da (Org.) REUNIAO ANUAL DA SBQ, 45., 31 de maio - 3 de junho, 2022, Maceió, AL. Resumo... São Carlos, SP: Aptor Software, 2022. p. 380-380.

    Abstract: Trivalent lanthanide coordination compounds are characterized by their long luminescence lifetime of emitting level, narrow emission band and high color purity, which makes them fascinate for application in LCMDs, OLEDs, immunoassay, bioimaging probes, luminescent sensors and in telecommunications systems etc. Among this class of compounds, those ones in which β-diketonate ligands act as luminescence sensitizers have found a prominent position. However, most of these systems are obtained in the form of simple molecular entities. Recently, interest in new polynuclear systems containing diketonate ligands has been growing significantly. Therefore, this work reports on the synthesis, characterization, and photophysical properties of the lanthanide compounds of general formula [Ln2(β- dik)6(dppeO2)], where β-dik = tta, bzac, dbm, [Ln(β-dik)3(dppeO2)] where β-dik = btf and [Ln(β-dik)3(dppeO2)2]n where β-dik = fod, dppeO2 = 1,2-Bis(diphenylphosphino)ethane oxide, Ln = Eu3+ and Gd3+. These complexes were prepared by direct reaction among ethanolic solutions of the [Ln(β-dik)3(H2O)] complexes and dppeO2 ligands in the molar ratios [Ln(β-dik)3(H2O)]: dppeO2 of 2:1. The FT-IR spectra of complexes show red-shifted of 20–41 cm-1 for the band assigned to the ν(C=O) vibrational mode (Fig 1a), suggesting that β–diketonate ligands are coordinated to the Ln3+ ion in chelating mode. Diffuse reflectance spectra of the Eu3+-complexes show strong absorption bands in the range of 200–450 nm ascribed to the S0→Sn (ππ* or mixed nπ*) transitions from the diketonate ligands. The high relative intensities between excitation bands from ligand and 4f-4f transitions in the complexes with tta, btf and bzac indicates an efficient ligand-to-metal energy transfer process. On the other hand, for complexes with fod, dbm and bzac (Fig 1b) a lower intensity of the ligand bands is observed, suggesting that a luminescence suppression channel is operative. The emission spectra present the bands assigned to the 5D0→7FJ (J = 0–4) transitions of the europium ion (Fig 1c). The Ω2 and Ω4 intensity parameters, lifetime (τ) and luminescence intrinsic quantum yield ΦEu/Eu were calculated from the emission spectral data and luminescence decay curves of the compounds in solid state (Table 1). According with these data, the polymeric or dimeric investigated systems exhibit high luminescence intensities in the red region, which make them potential candidates for application as emitting layer in molecular light-converting devices.

    Como referenciar este item
    Icon

  • IPEN-DOC 28444

    FRANCISCO, LEONARDO ; FELINTO, MARIA ; BRITO, HERMI. Development of rare-earth-doped hybrid materials towards luminescence enhancement. In: PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS, October 13-15, 2020, Online. Abstract... 2020.

    Abstract: The rapid growth on the development of rare-earth-doped luminescent materials has been drawing attention due to complex energy converting systems that can be structurally engineered to tune absorption and emission wavelengths, outlining new materials and applications for photonics. [1, 2] In this scenario, this work presents the development of rare-earth-doped strontium aluminate phosphors prepared by the Pechini method and modified with 3-aminopropyltrimethoxysilane via microwaveassisted synthesis, integrating a silica network with rare-earth β-diketonate complexes in order to enhance the absorption section and promote energy-transfer processes within the system. The prepared materials were analyzed by X-ray powder diffraction, where a characteristic monoclinic SrAl2O4: Eu2+, Dy3+ phase with crystallite size around 30 nm was observed. Several structural changes attributed to surface modification were also noted. Scanning Electron Microscopy images and Energy- Dispersive X-ray Spectroscopy results revealed the expected surface alteration effects, as well as the element mapping throughout the samples. Standard UV-Vis and Vacuum-UV Luminescence Spectroscopies were also performed. The optical behavior of the synthesized materials was characterized by green Eu2+ emission assigned to the 4f65d1→4f7(8S7/2) interconfigurational transition under near-ultraviolet excitation alongside narrow 4f-4f transitions of non-reduced Eu3+. Furthermore, in functionalized samples, S0→Sn transitions attributed to β-diketonate ligands were also observed, unveiling an increasing absorption section under ultraviolet light. Finally, it was noted a significant increase in the persistence decay time under near Band-Gap excitation in modified materials, suggesting interactions between the inorganic host-matrix, the silica network, and the β-diketonate complexes.

    Como referenciar este item
    Icon

  • IPEN-DOC 26955

    BEZZAN, OTAVIO P.; PEDROSO, CASSIO C.S.; CARVALHO, JOSE M.; FELINTO, MARIA C.F.C. ; BRITO, HERMI F.; RODRIGUES, LUCAS C.V.. Discovering new colors of luminescence in rare-earths doped CaTiO3 through co-doping. In: WORLD CHEMISTRY CONGRESS, 46th; ANNUAL MEETING OF THE BRAZILIAN CHEMICAL SOCIETY, 40th; IUPAC GENERAL ASSEMBLY, 49th, July 07-14, 2017, São Paulo, SP. Abstract... Durham, NC, USA: International Union of Pure and Applied Chemistry, 2017.

    Abstract: The luminescence of CaTiO3:Pr3+ has been known since mid-90s [1] and its persistent luminescence has been explained via InterValence Charge Transfer transitions [2]. However, the trivalent dysprosium doped materials besides presenting white luminescence does not present any persistent luminescence. On the other hand, the expected red emission on materials doped with Eu3+ only occur when exciting in the forbidden 4f6-4f6 transitions. The objectives of this work are to show the synthesis and luminescence properties of CaTiO3:Dy3+ and CaTiO3:Dy3+,R3+ prepared with the sol-gel method [3, 4]. The excitation spectra of single Eu3+ or Dy3+ doped materials (Fig. left) show for Eu3+, only the 4f6-4f6 transitions while for Dy3+ both the 4f9-4f9 transitions as well as the O2-→TiIV charge transfer and the host absorption. The excitation spectrum for the Dy3+,Eu3+ co-doped material monitoring the Eu3+ emission at 610 nm exhibit both the Eu3+ intraconfigurational transitions as well as the O2-→TiIV charge transfer and the host absorption. This result indicates that there is no direct energy transfer from Dy3+ to Eu3+, but Dy3+ acts as a sensitizer for Eu3+ to be excited by host transitions. Based on experimental data the energy level diagram was constructed (Fig. right) showing that Eu3+ is deep inside the valence band.

    Como referenciar este item
    Icon

  • IPEN-DOC 28441

    MOREIRA, R.P. ; FRANCISCO, L.H.C. ; BRITO, H.F.; MALTA, O.L.; TEOTONIO, E.E.S.; FELINTO, MARIA C.F.C. . Eu3+-doped BaMO4 (M: W or Mo) luminescent materials for lighting applications prepared by coprecipitation method. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th, July 26-30, 2021, Changchun, China. Abstract... 2021.

    Abstract: This work presents the development and investigation of the structural, spectroscopic, and electronic properties of Eu3+-doped BaMO4 (M: W or Mo) compounds obtained by the coprecipitation method, at room temperature, targeting applications in phosphor-converted Light-Emitting Diode (pc-LEDs) lighting devices [1,2]. A systematic study was performed to determine optimal doping concentrations in order to obtain high-intensity monochromatic-like luminescence with efficient lanthanide quantum yield for red light emission. Structural analysis by X-Ray Powder Diffraction showed a stable characteristic scheelite-type structure for all of the studied compounds, with no phase segregation, as confirmed by Rietveld Refinement, whereas average crystallite size was estimated to be about 30 nm. Morphology and elemental distribution were probed by Scanning Electron Microscopy coupled with Energy dispersive X-ray spectroscopy, where homogeneous europium distribution was identified even at high doping concentrations (up to 10% molar). The optical behavior of the prepared materials was studied by Diffuse Reflectance Spectroscopy and Luminescence Spectroscopy in the UV-Vis range, displaying characteristic red emission, together with the nephelauxetic effect associated with spectral red-shifts attributed to structural distortions around the Eu3+ ion and significant (LMCT) contribution. The intensity parameters Ω2,4 and lanthanide quantum yield QLn Ln of all Eu-doped materials were also determined. Furthermore, the CIE color diagram was investigated, showing the rate of greenish-blue host matrix contribution ([WO4]2- or [MoO4]2-) and Eu3+ luminescence in different compounds.

    Como referenciar este item
    Icon

  • IPEN-DOC 29595

    SAULA, MATHEUS S.N.; FELINTO, MARIA C.F.C. ; NUNES, LUIZ A.O.; MALTA, OSCAR L.; BRITO, HERMI F.. Europium activator ion acting as an efficient luminescent probe to identify local symmetry in Li2ZnSn3O8:Eu3+ materials prepared by the MASS method. In: SILVA, FERNANDO de C. da (Org.) REUNIAO ANUAL DA SBQ, 45., 31 de maio - 3 de junho, 2022, Maceió, AL. Resumo... São Carlos, SP: Aptor Software, 2022. p. 390-390.

    Abstract: Luminescent materials doped with rare earth ions (RE) have been intensely applied in several areas in the new photonic technologies, such as emergency lights, radiation detectors, biological markers, and anti-counterfeiting products. Stannate-based host matrices have attracted significant attention, as they are relatively inexpensive and have a favorable bandgap to allow the persistence luminescence phenomenon. In this work, Li2ZnSn3O8:Eu3+ was synthesized by the microwave-assisted solid-state method (MASS) using a domestic microwave oven after gridding Li2CO3, ZnO, SnO2, Eu2O3 precursor oxides. Therefore, the as-prepared precursors were heated in a static air atmosphere at a preset configuration of 900W for 20 min. The material was characterized by powder X-ray diffraction (PXRD), scan electron microscopy (SEM), and diffused reflectance spectroscopy. The PXRD patterns indicate the formation of the desired Li2ZnSn3O8matrix phase when doped with different concentrations of the Eu3+ ion, showing a high crystallinity. The photoluminescence properties were determined based on the emission spectra of the Li2ZnSn3O8:mol%Eu3+ materials (Fig 1), showing intense yellowish-orange and reddish-orange emission colors under UV excitation at 282 and 336 nm, respectively. Moreover, both spectra show narrow emission bands characteristic of 5D0 →7F0-4 Eu3+ transitions. Sinceeuropium ions are powerful spectroscopic probes for the symmetry of the first coordination sphere of these ions in a lattice, and the spectral profiles change with the incident radiation wavelengths, which demonstrates the presence of more than one site of symmetry around the chemical environment of the Eu3+ion.Finally, it is noteworthy that these luminescent materials can be selectively excited in the UV range, leading to more than one specific emission spectral profile, which can be applied as efficient luminescent probes for anti-counterfeiting products.

    Como referenciar este item
    Icon

  • IPEN-DOC 27643

    FRANCISCO, L.H. ; FELINTO, M.C. ; BRITO, H.F.. Hydrothermal synthesis of rare-earth doped nanoparticles for energy conversion and storage. In: PAN-AMERICAN NANOTECHNOLOGY CONFERENCE, 2nd, March 4-7, 2020, Águas de Lindoia, SP. Abstract... 2020.

    Abstract: In recent years, several classes of rare-earth doped luminescent nanoparticles have been drawing attention due to complex energy converting systems that can be structurally engineered to tune absorption and emission wavelengths, outlining novel materials and applications on photonics [1-2]. In this scenario, this work presents the development of rare-earth doped core-shell SrAl2O4:Eu2+/3+, Dy3+ nanoparticles prepared via hydrothermal synthesis and post-annealed on carbon monoxide reducing atmosphere, which exhibit appealing spectroscopic properties for solar energy conversion and storage. The prepared strontium aluminate phosphors were further amino-functionalized with 3-aminopropyltrimethoxysilane (APTMS) and ?-diketonate rare-earth complexes by microwave assisted synthesis [3], in order to enhance its absorption section and energy-transfer processes within the system. Prepared samples were analyzed by X-ray powder diffraction, which revealed a stable monoclinic phase of pure strontium aluminate accordingly to PDF34-379. Crystallite size was estimated by the Scherrer method, indicating dimensions of about 25 nm. Moreover, standard luminescence spectroscopy results of pure SrAl2O4:Eu2+/3+, Dy3+ showcased characteristic green Eu2+ emission assigned to the 4f65d1?4f7(8S7/2) interconfigurational transition under near ultraviolet excitation. It was also found that amino-functionalized samples display distinguished emission spectral profiles, as Eu2+ emission shifts on ?-diketonate coated samples, suggesting an effective interaction between the inorganic host-matrix, the silica network and the ?-diketonate complexes. Likewise, acquired excitation spectra monitored on Eu2+ emission revealed its characteristic broad band in the ultraviolet region, as well as non-reduced Eu3+ narrow absorption lines. In addition, ?-diketonate S0?Sn transitions were also observed on functionalized samples, unveiling an increasing absorption section under ultraviolet light. Finally, it is highlighted that prepared SrAl2O4:Eu2+/3+, Dy3+ persistent phosphors displayed intensifying characteristic green emission under UV light due to imposed surface modification processes by functionalization. Therefore, as its emission wavelength overlaps with a commonly used dye (N719) in dye-sensitized solar cells, the materials assembled in this work aspire to enhance energy conversion efficiency and storage on such photovoltaic devices.

    Como referenciar este item
    Icon

  • IPEN-DOC 28442

    FRANCISCO, L.H.C. ; MOREIRA, R.P. ; BRITO, H.F.; TEOTONIO, E.E.S.; MALTA, O.L.; FELINTO, M.C.F.C. . Luminescence of Eu(tta)3(N-picNO)2 (N=2, 3 and 4) doped PMMA films under Synchrotron radiation. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th, July 26-30, 2021, Changchun, China. Abstract... 2021.

    Abstract: Since their discovery, trivalent lanthanide β-diketonate complexes often stand out among luminescent coordination compounds [1]. Thus, the incorporation of such complexes into polymeric materials proposes increased photostability, optical quality, and processing conditions [2]. In this work, we prepared and doped the luminescent Eu(tta)3(N-picNO)2 (N=2, 3 and 4) complexes into Poly(methyl methacrylate) (PMMA) films via the solvent casting method, yielding transparent materials under visible light. These amorphous materials (XRD) presented considerable thermal stability up to 300°C (TGA), and their spectroscopic properties with ancillary ligand exchange were investigated by luminescence spectroscopy in the UV-Vis and Vacuum-UV energy range by synchrotron radiation. Mainly, Eu3+ transitions (5D0→7F0-4) were observed in the emission spectra for all compounds, with intense monochromatic-like red (614 nm) emission (Fig. 1), indicating efficient intramolecular energy transfer. Experimental intensity parameters and quantum yields were also determined, where it is seen the influence on the positioning of the methyl group in the luminescence efficiency.

    Como referenciar este item
    Icon

  • IPEN-DOC 27636

    FELINTO, M.C. . Nanocrystals of BaWO4:Dy3+ and SrWO4:Dy3+ synthetized by green chemistry method. In: PAN-AMERICAN NANOTECHNOLOGY CONFERENCE, 2nd, March 4-7, 2020, Águas de Lindoia, SP. Abstract... 2020.

    Abstract: Nowadays, the investigation of oxide based light emitting materials for white light emitting diodes (w-LEDs) or device applications have generated interest due to the advantages such as long lifetime, low energy consumption, high luminescence efficiency and environmental friendliness [1]. These qualities make them a strong candidate for the solid state lighting, display devices, optoelectronic devices and light-emitting diodes (LEDs). In this work, we present results of Dy3+: BaWO4 and Dy3+: SrWO4 that present luminescence close to white color (Figure 1) left. They were synthesized using co-precipitation method. The emission spectra exhibit four emission transitions centered at around 486 nm, 576 nm, 665 nm and 760 nm corresponding to the transitions 4F9/2?6H15/2 (blue), 4F9/2?6H13/2 (yellow) 4F9/2?6H11/2 and 4F9/2?6H9/2 6F11/2 (red) respectively. Among these transitions 4F9/2?6H15/2 and 4F9/2?6H13/2 are observed to be strong whereas 4F9/2?6H11/2 transition is found to be relatively quite weak. The 4F9/2?6H13/2 transition is hypersensitive in nature and is strongly influenced by the environment around the Dy3+ ion site. It is observed in the luminescence spectra of these materials that the electric dipole transition is dominant compared to the magnetic dipole transition. The CIE diagram show emission close to white (Fig.1 right) for the five composition with little distortion of the color showing the influence of dopant concentration in the color of the emission. Figure 1. Dy3+: BaWO4 under UV excitation (366nm) left, emission spectra under excitation at 350nm middle and chromaticity coordination diagram of BaWO4:Dy3+ material.

    Como referenciar este item
    Icon

  • IPEN-DOC 27637

    BRITO, H.F.; FELINTO, M.C. ; FRANCISCO, L.H. ; SAULA, M.S.; MERIZIO, L.G.. Nanoparticles presenting the phenomenon of luminescent persistence make the difference in biological applications. In: PAN-AMERICAN NANOTECHNOLOGY CONFERENCE, 2nd, March 4-7, 2020, Águas de Lindoia, SP. Abstract... 2020.

    Abstract: The persistent luminescent materials are an important class of light-induced energy storage materials, which have undertaken a long development process. Recently, there has been increasing interest in employing long persistence luminescent nanoparticles (LPLNPs) for in vivo imaging. Because the long afterglow of these nanoparticles can last for several hours after they are excited in vitro, real-time in vivo imaging can be achieved after injection without requiring any external illumination source. Thus, the SNR can be significantly improved by removing the background noise originating from in situ excitations. Moreover, the afterglow luminescence of near-infrared (NIR)-emitting long-persistence luminescent nanoparticles (NLPLNPs) (the afterglow wavelength varies from 650 nm to 900 nm) falls within the tissue transparency window, where light attenuation is largely due to scattering rather than absorption, which is advantageous for long-term in vivo imaging with deep penetration and a high SNR1-3. In this work, we will be discussed the synthesis of these LPLNPs, the characterization and the luminescent properties especially the persistent luminescence intensity and lifetime that are the two important parameters to evaluate the persistent luminescent properties of materials. It was expected the materials to have a very high luminescence intensity and long persistent lifetime. The development of rare-earth doped core-shell SrAl2O4:Eu2+/3+, Dy3+ nanoparticles prepared via hydrothermal synthesis and p-st-annealed on carbon monoxide, in reducing atmosphere, or materials like Li1,6M1,6Sn2,8O8:R3+ (M2+: Mg, Zn and Cd; R3+: Cr, Nd, Yb), etc prepared by microwave-assisted solid-state reaction, ceramics method and co-precipitation reaction generate materials with efficient persistent luminescence and will be discussed in terms of electronic structure and syntheses methodology. Moreover, standard luminescence spectroscopy results of pure characteristic green Eu2+ emission assigned to the 4f65d1?4f7(8S7/2) interconfigurational transition under near-ultraviolet excitation. Some of these materials have special behavior and present persistent luminescence in the near-infrared, NIR, which is very important in terms of biological application point-of-view.

    Como referenciar este item
    Icon

  • IPEN-DOC 28552

    FRANCISCO, LEONARDO H.C. ; MOREIRA, RENAN P. ; SALVADOR, FRANCINE F. da S. ; MOTTA, MARCIO P. ; FELINTO, MARIA C.F. da C. ; BRITO, HERMI F.. Near-infrared emitting Cr(3+)-doped mixed oxide luminescent materials for optical imaging. In: BRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS, August 30 - September 3, 2021, Online. Abstract... São Carlos, SP: Aptor Software, 2021. p. 194-194.

    Abstract: The rapid growth of optical imaging in the latest years proposes novel alternatives to well-established imaging techniques, in a way that current research interest within this field is now focused on the design of efficient photonic materials and optical sensors[1-2]. In this scenario, this work presents the development of Cr3+-doped Zn/Mg/Sn mixed oxides prepared via solid-state and microwave synthesis, exhibiting interesting spectroscopic properties in the red to near-infrared (NIR) range. Prepared compounds were analyzed by PXRD, where the obtained diffraction profiles followed mainly the overlapping Mg2SnO4 and Zn2SnO4 patterns, and crystallite size was estimated to be about 70 nm. SEM/EDS analysis revealed micrometer-sized particles up to 20 μm, but much smaller particles and homogeneous Cr3+ distribution were also observed. Moreover, Synchrotron radiation measurements obtained at the Brazilian Synchrotron Light Laboratory, on the TGM beamline via Vacuum UV Spectroscopy within the 4.5–7.5 eV energy range revealed distinct emission profiles with increasing Zn concentration, affecting the contribution of deep-red and NIR vibronic sidebands at 700 and 720 nm, respectively. Still, maximum absorption energies (about 6.6 eV) remained constant for all the analyzed compounds, whereas the broad-band NIR emission of Cr3+ ion centered around 770 nm assigned to the [4T2(t2e)→4A2] transition is predominant. Persistent luminescence decay curves under near-band gap excitation were also probed. Thus, in this work, we demonstrated an effective way to assemble NIR emitting luminescent materials with potential applications in optical imaging and photonics, where similar and expensive Cr3+-doped gallates are already widely explored.

    Como referenciar este item
    Icon

  • IPEN-DOC 28439

    ASSUNCAO, I.P.; BRITO, H.F.; FELINTO, M.C.F.C. ; TEOTONIO, E.E.S.; MALTA, O.L.. A new series of luminescent tetrakis Ln3+-complexes with α-substituted β-diketonate ligands and Na+ as countercation. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th, July 26-30, 2021, Changchun, China. Abstract... 2021.

    Abstract: The Ln3+ β-diketonate coordination compounds have received growing attention in the past few years, mainly due to their inherent huge variety of applications. The tris and tetrakis species have also been widely used as an emitting layer in organic light-emitting diodes (OLEDs) due to their high intensity and monochromatic emission. The tetrakis complexes usually present improved properties such as thermal and chemical stabilities, besides higher luminescence lifetimes than its correspondent tris complexes. Moreover, the commonly hydrated tris Ln3+-complexes show a luminescence quenching due to vibronic coupling between H2O molecules and the Ln3+ principal emitting levels (e.g., 4G5/2, 5D0, 5D4, 4F9/2 and 1G4 of the Sm3+, Eu3+, Tb3+, Dy3+ and Tm3+ ions, respectively) [1]. The acetylacetone (2,4-pentanedione) ligand, Hacac, is one of the most extensively used and studied β-diketonate ligands, especially for the Tb3+ ion. Nevertheless, the α-substituted Ln3+ β-diketonate complexes are relatively scarce in the literature [2]. Hence, this work reports the synthesis, characterization, and photoluminescent study of a new series of tetrakis coordination compounds containing the α-substituted β-diketonates 3-chloro acetylacetone (Cl-acac), presenting the general formula Na[Ln(Cl-acac)4], where Ln: Sm3+, Eu3+, Tb3+, Dy3+, and Tm3+. All complexes were characterized by elemental analysis, complexometric titration, thermal analysis, infrared absorption spectroscopy (FTIR), and X-ray powder diffraction (XPD). The Ln3+ complex photoluminescent properties (Figure 1) as well as the experimental intensity parameters (Ω2,4) of the Eu3+ were determined.

    Como referenciar este item
    Icon

  • IPEN-DOC 25986

    SALVADOR, F.F.S. ; FELINTO, M.C.F.C. ; FRANCISCO, L.H.C. ; BARBOSA, H.P.; BRITO, H.F.. Optical properties of Eu 3+ and Tb 3+ - doped tin dioxide nanoparticles prepared by coprecipitation method. In: SÃO PAULO SCHOOL OF ADVANCED SCIENCE ON MODERN TOPICS IN BIOPHOTONICS, March 20-29, 2019, São Carlos, SP. Abstract... 2019. p. 45-45.

    Abstract: Rare earth (RE) ion doped phosphors have attracted great interest during the past several decades due to their unique physical and chemical properties. RE ions can display many meaningful properties in optics, electronics, and magnetics, originating from f-f electronic transitions within the 4f shell. Doping of wide band gap of metaloxide semiconductors with RE proved to be a successful tool for tailoring their electrical, optical and microstructural properties. Tin dioxide combines high electrical conductivity with optical transparency. The luminescence of pure SnO2, observed in the UV and/ or visible region (350-550 nm) is generally correlated with the presence of crystalline defects, mainly oxygen vacancies, the most likely candidates for recombination centers in emission processes for SnO2 samples. In this work, the incorporation of the Tb3+ and Eu3+ - doped SnO2 nanoparticles were prepared by coprecipitation method. In semicontuctor nanocrystals, lattice distortions near the surface may produce distinct RE3+ environments, which may be enough to affect their band structure and to relax the dipole-forbidden rule. SnO2:Eu3+ presents the appropriate energetic configuration, which takes effect the luminescence in visible range. The ground state (7F0) and some of the metastable excited levels of Eu3+ ion (5D0, 5D1) are situated in the band gap of SnO2. It allows to observe a typical orange/red emissiom from the excited 5D0 to 7FJ (J=0-4) levels. SnO2: Tb3+ presents the transition 5D4→ 7F6 more intense than 5D4→7F5 and exhibit bluish emission in chromaticity diagram. The CIE parameters and CCT values were also varied and the emission color can be tuned from warm to cool light. In addition, this work opens the possibility to produce new functionalized nanoparticles with control of luminescent properties for photonic and biomedical applications.

    Como referenciar este item
    Icon

  • IPEN-DOC 28440

    PARRA, DUCLERC F. ; MARCHINI, LEONARDO G. ; FELINTO, MARIA C. ; BRITO, HERMI F.. Photoluminescent properties of the polyamide /Eu3+ β-diketonate complex for optical application. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th, July 26-30, 2021, Changchun, China. Abstract... 2021.

    Abstract: The Eu3+ complex precursor, the polymeric (PA) optical marker and the plastic luminescent films obtained were characterized by infrared spectroscopy (FTIR), X-Ray diffractometry (DRX), emission spectroscopy, and thermogravimetry (TGA). The emission spectra of the Eu3+–tta complex doped in the PA exhibited the characteristic bands arising from the 5D0 → 7FJ transitions (J = 0-4). High values of the Ω2 intensity parameter were obtained, indicating the hypersensitive character of the 5D0 → 7F2 transitions and the Eu3+ ions are in a polarizable chemical environment. The high values of the Ω4 parameter confirm the basicity of the oxygen donor from the polymer. Lifetime measurement suggests that doped Eu3+ ion has higher luminescence efficiency in the film than hydrated complex. The emission quantum efficiencies (η) and the highest value are observed in the system PA:[Eu(tta)3(H2O)2] 5%. The PA-optical marker resulted a luminescent plastic film, with high stability when processing.

    Como referenciar este item
    Icon

  • IPEN-DOC 29593

    FELINTO, MARIA C.F.C. ; SILVA, JAQUELINE A.P. ; FRANCISCO, LEONARDO C. ; COSTA, ISRAEL F.; TEOTONIO, ERCULES E.S.; MALTA, OSCAR M.L.; BRITO, HERMI F.. Preparation and photoluminescence properties of functionalized silica submicron-sphere materials decorated with Eu(tta)3•FX complex (FX= fluoxetin). In: SILVA, FERNANDO de C. da (Org.) REUNIAO ANUAL DA SBQ, 45., 31 de maio - 3 de junho, 2022, Maceió, AL. Resumo... São Carlos, SP: Aptor Software, 2022. p. 511.

    Abstract: The development of functionalized silica particles containing luminescent materials has received special attention because of their biological applications such as optical markers in vitro and in vivo, clinical diagnosis and drug delivery. The incorporation of Eu3+-complex into modified silica particles combines optical characteristics of Eu3+- complex and properties of inorganic oxides, resulting in organic-inorganic hybrid materials. In this work, we synthesize and characterize sub-microspheres of SiO2 decorated with a new complex of Eu3+ and fluoxetine, an antidepressant of the selective serotonin reuptake inhibitor (SSRI) class. The Eu-complex and the submicron-spheres (ϕ~500nm) were characterized optically and photo-physical characteristics of these materials were examined spectroscopically. In emission spectra of complex (Fig 1.a), four characteristic peaks of Eu3+ ion with the maximum at ~580 nm, ~595 nm, ~614 nm, and ~702 nm accredited to 5D0 → 7FJ (J = 0-4) transitions appeared upon excitation in UV region. The most intense peak at 614 nm is accountable for the bright red emission of the ternary complex. For the SiO2 nanospheres decorated with the complex these transitions are close to the complex but are identified the change in the symmetry around the Eu3+ ion when analyzing the spectra. Experimental intensity parameters (Ωλ), lifetime (τ), radiative (Arad) and non-radiative (Anrad) coefficients, and intrinsic quantum yield (Q Eu3+/Eu3+) values were determined. 3D emission spectra for the Eu(tta)3•FX complex in the VUV region (Fig. 1b) revealed a high emission band originated from (Eu3+) 5D0→7F2,4 transitions (centered around 614 and 702nm) under excitation at near bandgap energy. Color purity and CIE parameters also suggest the red luminous behavior of complex. Thermal and morphological behavior of the Eu-complex and submicron-spheres decorated with the Eu(tta)3•FX complex are also evaluated (Fig1c). Our investigation has revealed that the synthesized complex and inorganic hybrid materials could be used in preparing lighting systems, OLEDs, display devices and biological sensors owing to their luminescent characteristics

    Como referenciar este item
    Icon

  • IPEN-DOC 26971

    KHAN, LATIF U.; BRITO, HERMI F.; MURACA, DIEGO; COSTA, LUELC S. da; FELINTO, MARIA C.F. da C. . Red-emitting magnetic mesocomposites of Ag-decorated Fe3O4@SiO2 nanoflowers coated with Y2O3:Eu3+: study of iron oxide induced luminescence quenching. In: BRAZIL MRS MEETING, 16th, September 10-14, 2017, Gramado, RS. Abstract... São Carlos, SP: Aptor Software, 2017. p. 127-127.

    Abstract: The new multistep approach for co-assembling magnetic iron oxide nanoflowers with red-emitting Y2O3:Eu3+ to form magneto-luminescent mesocomposites was reported. The Fe3O4 core particles prepared by solvothermal method were layered with SiO2 shell and decorated with small size spherical Ag nanoparticles as well as further coated with Y2O3:Eu3+ lluminophore. The nanoflower shape Fe3O4 core of size ~110 nm and crystalline cubic structure of bifunctional ironoxide@ Y2O3:Eu3+, Fe3O4@SiO2@Y2O3:Eu3+ and Fe3O4@SiO2-Ag@Y2O3:Eu3+ (1 mol%) mesocomposites were confirmed from X-rays diffraction, EDS spectra and transmission electron microscopy images. The static magnetic measurements supported and manifested nonsuperparamagnetic behavior of the materials at 300 K. The iron oxides are usually luminescent quencher, therefore, the photoluminescence properties based on the emission spectral data and luminescence decay curves were studied. In addition, experimental intensity parameters (Ωλ), lifetimes (τ), emission quantum efficiencies as well as radiative (Arad) and non-radiative (Anrad) decay rates were also calculated, in order to probe the local chemical environment of the Eu3+ ion and better understand the phenomena of iron oxide induced luminescence quenching. The highest value of the quantum efficiency = 74 %, for the a-Fe2O3@Y2O3:Eu3+ (1 mol%) among all the luminescent and magnetic mesocomposites suggests that Fe2O3 is induced lower luminescence quenching then Fe3O4. Though, the thin layer of SiO2 spacer is caused of increase the quantum efficiency, whereas the Ag is further enhanced the luminescence quenching by energy transfer form Eu3+ ion to the Ag nanoparticles. These novel Eu3+ mesocomposites may act as a red emitting layer for magnetic and light converting molecular devices.

    Como referenciar este item
    Icon

  • IPEN-DOC 28443

    FELINTO, M.C.F.C. ; ALI, B. ; FRANCISCO, L.H.C. ; BLOIS, L.; BRITO, H.F.; MALTA, O.L.; TEOTONIO, E.E.S.. Synthesis and luminescent properties of three new and bright Eu - tta compounds modified on α-carbon for use as biological markers. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 19th, July 26-30, 2021, Changchun, China. Abstract... 2021.

    Abstract: Three smarts luminescent Eu3+ complexes (Eu1 = Eu(tta-ester)3phen 1, Eu2 = Eu(tta- NH2)3phen 2, Eu3 = Eu(tta-COOH)3phen, were synthesized by using phenanthroline as the neutral ligand and Cα modified 2-thenoyltrifluoroacetonate and as the anionic ligand. All the Eu(III) complexes were structurally characterized by spectroscopic methods. Photoluminescence (PL) emission spectra of Eu complexes showed red color emission in the solid state. These materials were analyzed by X-ray diffraction, scanning electron microscopy and by energy dispersive, ultraviolet–visible spectroscopy, luminescence and vacuum ultraviolet–ultraviolet spectroscopies.The spectra show several sharp emission bands ranging from 450 to 750 nm due to the 4f– 4f transition from the excited state 5D0 to the low-lying multiple level 7FJ (J = 0, 1, 2, 3 and 4) of the Eu3+ ion. The five main sharp emission peaks were observed at wavelengths of c.a. 579, 591, 613, 653 and 702 nm, which are attributed to the f–f electronic transitions of the Eu(III) ion (5D0 → 7F0, 5D0 → 7F1, 5D0 → 7F2, 5D0 → 7F3 and 5D0 → 7F4, respectively). These complexes were evaluated also in terms of high energy.VUV-UV emission spectra present the 5D0→7F2 the transition dominating the spectrum under excitation at higher energies (Fig.1).

    Como referenciar este item
    Icon

  • IPEN-DOC 27652

    MOREIRA, R.P. ; FELINTO, M.C. ; BRITO, H.F.. Synthesis of tungstates nanoparticles with luminescent properties. In: PAN-AMERICAN NANOTECHNOLOGY CONFERENCE, 2nd, March 4-7, 2020, Águas de Lindoia, SP. Abstract... 2020.

    Abstract: Nanomaterials doped with rare earth ions have attracted great attention due to their unusual optical and electronic properties which leads these materials to be looked at as potential materials for application in the fields of high performance luminescent devices, lighting, magnets, catalysts, medical diagnostics, markers biological luminescent, etc. The advantages of using lanthanide ions as luminescent markers are numerous: it is a safe, low cost method, has higher specificity, the tests are more sensitive and the luminescence can be measured quickly, with a high degree of sensitivity and accuracy. [1-3] Among the methods used in obtaining nanocrystals can be mentioned: coprecipitation, sol-gel, microemulsion, microwave, polymer precursor, among others. In recent years, the polymer precursor (Pechini) and combustion methods are being used with greater emphasis due to the race to obtain nanoparticulate compounds, with homogeneous morphology in order to improve the performance of luminescent materials with application in nanotechnology. The Ba(1-x)WO4:xEu3+ powders were synthesized using the Pechini method, where the solutions of the salts of the Ba2+ and Eu3+ percussors in the form of NO3 ions. The 1: 4 citric acid and ethylene glycol solutions were added in the form of heat and heat to form a polymer resin, the pH being adjusted to 7 with ammonium hydroxide so that a brown, transparent resin . This resin was heated at 300°C for 2 hours, resulting in a black mass, which was prepared for the preparation of the precursor in powder form. The precursor was calcined at a preset temperature of 900°C for the production of barium tungstate.

    Como referenciar este item
    Icon

  • IPEN-DOC 29592

    SANTOS, SIMEI T.S.; BRITO, HERMI F.; TEOTONIO, HERCULES E.S.; FELINTO, MARIA C.F.C. ; MALTA, OSCAR L.. Synthesis, modification surface and characterization of tungstate/molybdate of zinc, doped with lanthanide ions [ Zn1-xREx(WO4)y(MoO4)z] (y or z = 0, 0.5, 1). In: SILVA, FERNANDO de C. da (Org.) REUNIAO ANUAL DA SBQ, 45., 31 de maio - 3 de junho, 2022, Maceió, AL. Resumo... São Carlos, SP: Aptor Software, 2022. p. 535-535.

    Abstract: A class of materials with the general formulation of MIMIII(XO4)2 (MI=Alkali metal, MIII = trivalente metal and X = W or Mo) with structural importance and diferente properties exposed to the attention of researchers, especially when doped with rare earth ions, which give the material luminescent properties. These properties can make the material promisingly important for diverse applications, such as solar cells, light converting devices and sensors, depending only on the changes in its structure and surface. This work was synthesized using co-precipitation method from aqueous solutions tungstates and molybdates of zinc doped with rare earth íons (Scheme 1a [Zn0.95Eu0.05WO4],1b [Zn0.95Eu0.05(WO4)0.5(MoO4)0.5],1c [Zn0.95Eu0.025Tb0.025WO4]) and coated with a thin layer of sílica (scheme 1d) using the hydrolysis and condensation of tetraethoxysilane (TEOS). For the phenantroline ligand functionalization, 3- (chloropropyl)triethoxy-silane (CPES) was grafted onto the particle surfaces in their aqueous suspensions, and bound to modified phenanthroline. For the synthesis of doped tungstates and molybdates, equivalent amounts of zinc, terbium, and europium chlorides were added under stirring at 70 °C for 1h. After drying, the material was ground with TEOS, water, ethanol and remained (with catalyze acid) for 3h at 70 °C under constant agitation. The 1,10- Phenantroline (scheme 1e) has been nitrated (H2SO4/HNO3) (scheme 1f) and reduced (Sn/HCl) (scheme 1g and infrared) to then be coupled to the modified particle. The final product was characterized. We are currently improving and studying synthesis conditions and aplications.

    Como referenciar este item
    Icon

  • IPEN-DOC 28445

    ASSUNCAO, ISRAEL; NETO, ALBANO; MOURA JUNIOR, RENALDO; PEDROSO, CASSIO; SILVA, IVAN; FELINTO, MARIA C. ; TEOTONIO, ERCULES; MALTA, OSCAR; BRITO, HERMI. The influence of the odd-even effect of aliphatic dicarboxylate ligands on the photoluminescent properties of europium complexes. In: PREQUEL SYMPOSIUM ON ADVANCED TECHNOLOGIES AND MATERIALS, October 13-15, 2020, Online. Abstract... 2020.

    Abstract: Eleven [Eu2(L)3(H2O)x]·y(H2O) complexes with aliphatic dicarboxylate ligands (L: OXA, MAL, SUC, GLU, ADP, PIM, SUB, AZL, SEB, UND, and DOD, where x=2–6 and y=0–4) were synthesized and characterized by elemental and thermal analysis, FTIR spectroscopy and powder X-ray diffraction. The obtained data confirms the ligand to metal ratio, the hydration degree, the coordination mode and that the complexes are crystalline. The oddeven effect was observed for the final dehydration temperature of the Eu3+ complexes (Fig. 1). Moreover, the effect was also observed in the experimental and theoretical photoluminescent properties such as the intensity parameters, Ω2 and Ω4 (Fig. 2) and the emission intrinsic quantum yield, QLnLn (Fig. 3) of the Eu3+ complexes. The odd-even effect on the Ω2 and Ω4 values could be explained by using an extension of the dynamic coupling mechanism, herein named the ghost-atom (GA) model, in which the long-range polarizabilities (α*) were determined by simulating the presence of a ghost atom in the middle of each ligand carbon chain and the localized molecular orbital approach. The GA approach is an extension of the Bond Overlap Model (BOM) [1].

    Como referenciar este item
    Icon

  • IPEN-DOC 29594

    COSTA, ISRAEL F.; BLOIS, LUCCA; SANTOS, PAULO R.; CARNEIRO NETO, ALBANO N.; MOURA JUNIOR, RENALDO T.; DEFLON, VICTOR M.; CARLOS, LUIS D.; FAUSTINO, WAGNER M.; FELINTO, MARIA C.F.C. ; LONGO, RICARDO L.; MALTA, OSCAR L.; TEOTONIO, ERCULES E.S.; BRITO, HERMI F.. Unexpected luminescent and thermal properties of novel tetrakis Eu3+- indandionate complex: experimental and theoretical studies. In: SILVA, FERNANDO de C. da (Org.) REUNIAO ANUAL DA SBQ, 45., 31 de maio - 3 de junho, 2022, Maceió, AL. Resumo... São Carlos, SP: Aptor Software, 2022. p. 437-437.

    Abstract: Luminescent coordination compounds based on trivalent europium ions (Eu3+) have found wide range of applications in new technologies, such as optoelectronics, molecular thermometers, and biomedical devices. Applications of this materials may be associated with narrow emission bands, which are arise from intra-configurational Laporte forbidden 4f – 4f transitions (5D0 → 7FJ). Furthermore, Eu3+ ion can act as a powerful spectroscopic probe and the 5D0 → 7F2 transition are strongly sensitive to small angular variations in the coordination polyhedron. However, the energy structures of the organic ligands in the complexes play the most important role on the Eu3+ luminescence sensitization process1. In this context, this work reports about theoretical, syntheses, characterization, and photoluminescence studies of a series of tetrakis complexes containing tetraethylammonium, Et4N+[Ln(L)4]– (Et4N+: tetraethylammonium cation, Ln: Gd and Eu, and L: 2-acyl-1,3-indandionate). The Judd–Ofelt intensity parameter (Ωλ), lifetime (τ), radiative (Arad) and non-radiative (Anrad) coefficients, and intrinsic quantum yield ΩEu/Eu) values were calculated for different temperatures (80 - 475 K) (Table 1). The Et4N+[Eu(isovind)4]– complex, where isovind: 2-isovaleryl-1,3-indandonate) shows an extraordinarily high value of the intensity parameter (Ω2 = 73.5×10-20 cm2, considering the index of refraction equal to 1.5) and radiative decay rate (Arad = 2.468×103 s-1) at 300 K. These optical results show an abnormally high emission intensity of the 5D0 → 7F2 transition (Figure 1), leading to the highest measured Ω2 value of the europium materials, to the best our knowledge, reported in the literature. In addition, this complex shows different solid phases at 367 and 460 K, leading significant changes in the band profile assigned to the 5D0 → 7F2 transition. The spectroscopic study of luminescent systems has shown very interesting and promising results for applications, such as OLED devices and luminescent thermometers based on Ln3+ ions.

    Como referenciar este item
    Icon

A pesquisa no RD utiliza os recursos de busca da maioria das bases de dados. No entanto algumas dicas podem auxiliar para obter um resultado mais pertinente.

✔ É possível efetuar a busca de um autor ou um termo em todo o RD, por meio do Buscar no Repositório , isto é, o termo solicitado será localizado em qualquer campo do RD. No entanto esse tipo de pesquisa não é recomendada a não ser que se deseje um resultado amplo e generalizado.

✔ A pesquisa apresentará melhor resultado selecionando um dos filtros disponíveis em Navegar

✔ Os filtros disponíveis em Navegar tais como: Coleções, Ano de publicação, Títulos, Assuntos, Autores, Revista, Tipo de publicação são autoexplicativos. O filtro, Autores IPEN apresenta uma relação com os autores vinculados ao IPEN; o ID Autor IPEN diz respeito ao número único de identificação de cada autor constante no RD e sob o qual estão agrupados todos os seus trabalhos independente das variáveis do seu nome; Tipo de acesso diz respeito à acessibilidade do documento, isto é , sujeito as leis de direitos autorais, ID RT apresenta a relação dos relatórios técnicos, restritos para consulta das comunidades indicadas.

A opção Busca avançada utiliza os conectores da lógica boleana, é o melhor recurso para combinar chaves de busca e obter documentos relevantes à sua pesquisa, utilize os filtros apresentados na caixa de seleção para refinar o resultado de busca. Pode-se adicionar vários filtros a uma mesma busca.

Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

Título: loss of coolant

Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

✔ Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

✔ 95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, bibl@ipen.br .

✔ Ao efetuar a busca por um autor o RD apresentará uma relação de todos os trabalhos depositados no RD. No lado direito da tela são apresentados os coautores com o número de trabalhos produzidos em conjunto bem como os assuntos abordados e os respectivos anos de publicação agrupados.

✔ O RD disponibiliza um quadro estatístico de produtividade, onde é possível visualizar o número dos trabalhos agrupados por tipo de coleção, a medida que estão sendo depositados no RD.

✔ Na página inicial nas referências são sinalizados todos os autores IPEN, ao clicar nesse símbolo será aberta uma nova página correspondente à aquele autor – trata-se da página do pesquisador.

✔ Na página do pesquisador, é possível verificar, as variações do nome, a relação de todos os trabalhos com texto completo bem como um quadro resumo numérico; há links para o Currículo Lattes e o Google Acadêmico ( quando esse for informado).

ATENÇÃO!

ESTE TEXTO "AJUDA" ESTÁ SUJEITO A ATUALIZAÇÕES CONSTANTES, A MEDIDA QUE NOVAS FUNCIONALIDADES E RECURSOS DE BUSCA FOREM SENDO DESENVOLVIDOS PELAS EQUIPES DA BIBLIOTECA E DA INFORMÁTICA.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.