Excitation mechanisms and effects of dopant concentration in Gd2O2S:Tb3+ phosphor

被引：54

作者：

da Silva, Alison Abreu ^{[1
]}

Cebim, Marco Aurelio ^{[1
]}

Davolos, Marian Rosaly ^{[1
]}

机构：

[1] Sao Paulo State Univ, UNESP, Inst Chem, LML, BR-14800900 Araraquara, SP, Brazil

来源：

JOURNAL OF LUMINESCENCE | 2008年 / 128卷 / 07期

基金：

巴西圣保罗研究基金会;

关键词：

scintillator; luminescence; cross relaxation; emission tuning;

D O I：

10.1016/j.jlumin.2007.11.095

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Gadolinium oxysulfide powders doped with different Tb3+ concentrations were prepared from sulfur vaporization on rare earths' basic carbonate precursors. Single-phase Gd2O2S samples were obtained, with Tb3+ doping up to 9 at%. The study of the excitation mechanisms revealed that the Tb3+ emission might occur after the direct Tb3+ excitation either by energy transfer from Gd3+ or from the phosphor host. The characteristic terbium emission lines were observed, resulting from the radiative decay from D-5(3) or D-5(4), to F-7(j) levels. The cross-relaxation phenomenon was observed and its effects on the materials emission color were discussed based on the CIE diagram. By using time-resolved spectroscopy, D-5(3) -> F-7(J) and D-5(4) -> F-7(J) transitions were separated. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1165 / 1168

页数：4

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