Výsledky vyhledávání - "Sónia S. Nobre"

AgInS2-ZnS nanocrystals: Evidence of bistable states using light-induced electron paramagnetic resonance and photoluminescence

Autor: Gilles Le Blevennec, Olivier Renard, Théo Chevallier, Sónia S. Nobre, Christian Lombard, Brigitte Pépin-Donat

Publikováno v: physica status solidi (RRL) - Rapid Research Letters. 8:349-352

The precursor (AgIn)x Zn2(1–x)(S2CN(C2H5)2)4 was used to prepared AgInS2–ZnS nanocrystals with different compositions (x = 0.4 and x = 0.7) and with different time of reaction (10 min and 75 min). The photoluminescence features of the nanocrystal

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a82434738b4646b36fa520027dda87f3
https://doi.org/10.1002/pssr.201308329

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Highly luminescent di-ureasil hybrid doped with a Eu(III) complex including dipicolinate ligands

Autor: Sónia S. Nobre, Luís D. Carlos, Sílvia Santos, Rute A. S. Ferreira, V. de Zea Bermudez, Marcelo O. Rodrigues, Maria E. de Mesquita, Mariana Fernandes

Publikováno v: Journal of Photochemistry and Photobiology A: Chemistry. 205:156-160

A short chain di-urea cross-linked poly(oxyethylene) (POE)/siloxane hybrid host (di-ureasil), designated as d-U(600), was doped with the Na 3 [Eu(dipic) s ]· x H 2 O (where dipic 2− is the dipicolinate ion) complex. The resulting material is non-p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::24b61568c4a6dc1293e8638e441e3e98
https://doi.org/10.1016/j.jphotochem.2009.04.022

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Dual role of a di-urethanesil hybrid doped with europium β-diketonate complexes containing either waterligands or a bulky chelating ligand

Autor: Mariana Fernandes, Luís D. Carlos, Ana Charas, Jorge Morgado, Rute A. S. Ferreira, M. C. Gonçalves, Sónia S. Nobre, Verónica de Zea Bermudez

Publikováno v: J. Mater. Chem.. 19:733-742

In the present work we report the unusual role played by a sol-gel derived di-urethane cross-linked poly(oxyethylene) (POE)/siloxane (di-urethanesil, d-Ut(600)) hybrid matrix in the immobilization of the β-diketonate aquocomplex Eu(btfac)3(H2O)2 (bt

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c60e020827e0b23ce0fbd851c437193b
https://doi.org/10.1039/b813155d

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Optical studies of ZnO nanocrystals doped with Eu3+ ions

Autor: Eduardo Alves, A. Cruz, M. C. Carmo, Sérgio Pereira, Marco Peres, Maria R. Correia, Teresa Monteiro, Sónia S. Nobre, M.J. Soares, Maymone Martins, A.J. Neves, R. A. Sá Ferreira, Angela S. Pereira, Tito Trindade

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

Synthetic ZnO nanocrystals have been intentionally doped with Eu3+ ions. Structural analysis performed on the nanocrystals showed wurtzite-ZnO as the only phase present in the samples. Photoluminescence in emission and excitation modes allows the ass

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3914615314d78838c76d66692ffe7b11
https://doi.org/10.1007/s00339-007-3941-9

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Energy Transfer and Emission Quantum Yields of Organic−Inorganic Hybrids Lacking Metal Activator Centers

Autor: Lianshe Fu, Ricardo O. Freire, Verónica de Zea Bermudez, Patrícia P. Lima, Luís Mafra, Sónia S. Nobre, Luís D. Carlos, Uwe Pischel, and Oscar L. Malta, Rute A. S. Ferreira

Publikováno v: The Journal of Physical Chemistry C. 111:3275-3284

This work discusses quantitatively the energy transfer mechanism that occurs in the white-light emission of sol−gel derived amine- and amide-functionalized hybrids. The white-light photoluminescence (PL) results from a convolution of the emission o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::37980d9340dbfb4f790dcf39b30dd6e3
https://doi.org/10.1021/jp0668448

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A theoretical interpretation of the abnormal 5D0→7F4 intensity based on the Eu3+ local coordination in the Na9[EuW10O36]·14H2O polyoxometalate

Autor: R. A. Sá Ferreira, Luís D. Carlos, Helena I. S. Nogueira, Carlos M. Granadeiro, Oscar L. Malta, Sónia S. Nobre

Publikováno v: Journal of Luminescence. 121:561-567

The Na9[EuW10O36]·14H2O polyoxometalate studied here has shown a peculiar 4f–4f emission spectrum that has two main differences in comparison to data reported previously in the literature: a 5D0→7F0 line with much smaller intensity and an abnorm

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::44a1266718548665b783eba205889eb2
https://doi.org/10.1016/j.jlumin.2005.12.044

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Chromatic Dispersion in Ge-Doped SiO2-Based Single Mode Fibres due to Temperature Dependence of the Ultraviolet Absorption: Numerical and Experimental Results

Autor: Paulo P. Monteiro, Rute A. S. Ferreira, Sónia S. Nobre, João L. Pinto, Luís D. Carlos, Armando N. Pinto, Paulo André

Publikováno v: Materials Science Forum. :369-376

The main information transmission limitation in optical communications employing SiO2 optical fibres is imposed by the optical pulses temporal broadening, resulting from the dispersive properties of the transmission medium (chromatic dispersion). Usu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d6bbee8c647a777b2326684816b309f8
https://doi.org/10.4028/www.scientific.net/msf.514-516.369

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Photoluminescence of Di-Ureasil Hybrids Doped with Silica Coated Ag Nanoparticles

Autor: Luís D. Carlos, Sónia S. Nobre, M. J. M. Gomes, Rute A. S. Ferreira, Luis M. Liz-Marzán, Carlos Silva, V. Boev

Publikováno v: Materials Science Forum. :113-117

Photoluminescence of di-ureasil hybrids containing homogeneously dispersed Ag nanoparticles, covered with silica shells was investigated at room temperature and compared with emission of undoped hybrids. Metal-doped di-ureasils show a broad emission

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6719b55ac69c561e0181a9235a6c7c46
https://doi.org/10.4028/www.scientific.net/msf.514-516.113

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Organically Modified Silica-Based Xerogels Derived from 3-Aminopropyltrimethoxysilane and 3-Isocyanatepropyltriethoxysilane through Carboxylic Acid Solvolysis

Autor: Luís D. Carlos, João Rocha, Sónia S. Nobre, Rute A. S. Ferreira, Lianshe Fu

Publikováno v: Materials Science Forum. :108-112

Organically-modified silica xerogels from 3-aminopropyltrimethoxysilane (APTES) and 3-isocyanatepropyltriethoxysilane (ICPTES) have been synthesized through carboxylic acid (formic acid, acetic acid and valeric acid) solvolysis. The resulting hybrid

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::81132b8e3d4e12afe366b292e4c465c8
https://doi.org/10.4028/www.scientific.net/msf.514-516.108

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Efficient spectrally dynamic blue-to-green emission of bipyridine-based bridged silsesquioxanes for solid-state lighting

Autor: Sónia S. Nobre, Rute A. S. Ferreira, Luís D. Carlos, Michel Wong Chi Man, Xavier Cattoën

Publikováno v: physica status solidi (RRL) - Rapid Research Letters. 4:55-57

We report a metal-free bpy-bridged silsesquioxane displaying an efficient and tuneable blue-to-green emission (maximum quantum yield and luminance values of 0.22 ± 0.02 cd m–2 and 63 ± 3 cd m–2, respectively) when excited by commercial InGaN li

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::261fd46a1d180d301635910ae75eb30b
https://doi.org/10.1002/pssr.200903396

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