Photoluminescence profiles and fast/slow annealing effects of Eu(III)/Tb(III)-codoped silica phosphor materials.
Luminescence
; 31(3): 821-9, 2016 May.
Article
em En
| MEDLINE
| ID: mdl-26394870
ABSTRACT
A silica (SiO2) nanoparticle matrix was codoped with luminescent Eu(III) and Tb(III) ions using a modified Stöber method. The effects of fast and slow thermal annealing on photoluminescence profile imaging were examined. Slow annealing treatment suppressed more quenching sites than fast thermal annealing to further increase the photoluminescence signals. The photoluminescence signals observed between 450 and 720 nm were assigned to the (5)D(0) â (7)F(J) (J = 0,1,2,3,4) of Eu(III) and the (5)D(4) â (7)F(J) (J = 6,5,4,3) transitions of Tb(III). Photoluminescence was largely sensitized by indirect excitation and was much stronger than that generated by direct excitation. The Eu(III) and Tb(III) ions were doped at lower symmetry sites in the silica matrix.
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MEDLINE
Assunto principal:
Térbio
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Dióxido de Silício
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Luminescência
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Európio
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Processos Fotoquímicos
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article