Adjusting luminescence properties of SrxCa1-xAl2O4:Eu2+, Dy3+ phosphors by Sr/Ca ratio

被引：44

作者：

Liu, Cheng ^{[1
]}

Wang, Yinhai ^{[1
]}

Hu, Yihua ^{[1
]}

Chen, Ren ^{[1
]}

Liao, Feng ^{[1
]}

机构：

[1] Guangdong Unit Technol, Sch Phys & Optoelect Engn, Guangzhou 510006, Guangdong, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 470卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

Phosphors; Chemical synthesis; X-ray diffraction; Luminescence; LONG PHOSPHORESCENCE; MECHANISM; BA;

D O I：

10.1016/j.jallcom.2008.03.001

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：

Long persistent phosphors SrxCa1-xAl2O4: Eu2+, Dy3+ (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) were prepared through a solution-combustion method at 600 degrees C. The phase structures of the phosphors were characterized by Xray diffraction. The major phase was CaAl2O4 when x < 0.8 with SrAl2O4 phase as a minor phase whereas, the major phase was SrAl2O4 when x >= 0.8. The results indicated that the phase structure of the samples changed from CaAl2O4 to SrAl2O4 when x changed from 0 to 1.0. The emission colors changed accordingly from blue to green-blue and then to green in visible range, as evidenced from the emission spectra. The decay characteristics showed that the life times also varied with the value of x. These results revealed that the emission colors and life times can be adjusted by the value of x. Furthermore, the reason that the emission colors and decay times varied with x has been ascribed to the distortion of crystal lattice. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：473 / 476

页数：4

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