Trapping processes of 5d electrons in Ce3+ doped SrAl2O4

被引：16

作者：

Jia, Dongdong

Wang, Xiao-jun ^{[1
]}

Jia, W.

Yen, W. M.

机构：

[1] Georgia So Univ, Dept Phys, Statesboro, GA 30460 USA

[2] Lock Haven Univ, Dept Geol & Phys, Lock Haven, PA 17745 USA

[3] Chinese Acad Sci, CIOMP, Key Lab Excited State Proc, Changchun 130033, Peoples R China

[4] Univ Puerto Rico, Dept Phys, Mayaguez, PR 00681 USA

[5] Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA

来源：

JOURNAL OF LUMINESCENCE | 2007年 / 122卷 / 311-314期

基金：

中国国家自然科学基金;

关键词：

long persistence; delocalization; trapping; thermoluminescence;

D O I：

10.1016/j.jlumin.2006.01.154

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Ce-3 divided by -doped SrAl2O4 single-crystal fibers have been prepared by laser-heated pedestal growth method. A broad emission band peaking at 385 nm and originating from the Ce3+ 5d-4f transition is observed with excitations at 340, 320, 29 1, and 259 nm, which correspond to the crystal field splitting components of the Ce3+ 5d states in SrAl2O4. The emission shows strong persistence for longer than 10 h after UV radiation at 254 nm from mercury lamp. Trapping dynamics of 5d electrons of Ce3+ in SrAl2O4 host is studied. The electron traps at 0.75 eV are found to be responsible for the long persistent phosphorescence. Excitation-dependent thermoluminescence spectra are also recorded and analyzed. The lowest 5d state of Ce3+ in SrAl2O4 is found to be about 0.1 eV below the host conduction band. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：311 / 314

页数：4

共 15 条

[1] Mechanisms of persistent luminescence in Eu2+, RE3+ doped alkaline earth aluminates [J].