Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Enhanced green emission of terbium-ions-doped phosphate glass embedding metallic nanoparticles

Texto completo
Autor(es):
Dousti, Mohammad Reza [1, 2] ; Amjad, Raja Junaid [3]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Islamic Azad Univ, Dept Phys, Tehran North Branch, Tehran - Iran
[2] Univ Sao Paulo, Inst Fis Sao Carlos, Lab Espectroscopia Mat Func LEMAF, BR-13566590 Sao Carlos, SP - Brazil
[3] COMSATS Inst Informat Technol, Dept Phys, Lahore 54000 - Pakistan
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF NANOPHOTONICS; v. 9, JUN 25 2015.
Citações Web of Science: 5
Resumo

Tb3+-doped glasses are promising materials for green lasers working at a UV-excitation light. It is essential to find a commercially low-cost host with high quantum efficiency in the visible region. We report the preparation and optical characterization of a thermally stable and optically transparent phosphate glass containing silver nanoparticles with nominal composition 57P(2)O(5)-40(ZnO-PbO)-2Tb(2)O(3)-1AgNO(3) (mol%) obtained by a melt-quenching technique and subsequent heat-treatments. The glasses are transparent in UV to near-infrared region and are not hygroscopic at ambient environment. The optical absorption and luminescence excitation spectra of the samples with and without silver nanoparticles are identical, and no sign of any silver species is revealed, while the luminescence spectrum is enhanced up to 1.7 times after heat-treating the samples for 15 h. The transmission electron microscopy and selected area diffraction pattern of glasses show the presence of silver nanoparticles with an average size of similar to 15 nm and growth at {[}200] crystallographic direction. The lifetime of the D-5(4) state of Tb3+ ions decreases from 3.06 to 2.85 ms by increasing the heat-treatment duration, which is indicative of the plasmonic effect of nanoparticles on the radiative rates of Tb3+-doped glasses. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE) (AU)

Processo FAPESP: 13/24064-8 - Estudos estruturais e fotofísicos de vidros fosfato de tungstênio dopados com íons terras raras e nanopartículas metálicas
Beneficiário:Mohammad Reza Dousti
Linha de fomento: Bolsas no Brasil - Pós-Doutorado