Cr3+ doping optimization in CaAl2O4:Eu2+ blue phosphor

被引：18
|
作者：
Ryu, H. [1 ]
Bartwal, K. S. [1 ,2 ]
机构：
[1] Korea Res Inst Chem Technol, Energy Mat Res Ctr, Taejon 305600, South Korea
[2] Raja Ramanna Ctr Adv Technol, Laser Mat Dev & Devices Div, Indore 452013, India
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 464卷 / 1-2期
关键词：
blue phosphor; solid-state reaction; XRD; SEM; TEM; luminescence;
D O I：
10.1016/j.jallcom.2007.09.100
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A new composition of phosphor material CaAl2O4:Eu2+ co-doped with Cr3+ was investigated. Various compositions with Eu2+ (1 and 2 mol%) and Cr3+ (0.05-0.1 mol%) were prepared by solid-state reaction method. These compositions show high brightness and longer persistent luminescence. Phase and crystallinity were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Excitation and emission spectra were taken to investigate the luminescence characteristics. Broad band UV excited luminescence of the CaAl2O4:Eu-2, Cr3+ was observed in the blue region (lambda(max) = 440 nm) Clue to transitions from 4f(6)5d(1) to the 4f(7) configuration of the Eu2+ ion. Cr3+ ion co-doping generates deep traps which results in longer afterglow phosphorescence compared to parent phosphor. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：317 / 321
页数：5
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