Red-emitting LiEuMo2-xSixO8 phosphors for white light-emitting diodes

被引:17
作者
Dai, Pengpeng
Zhang, Xintong [1 ]
Li, Xinghua
Wang, Guorui
Zhao, Chengjiu
Liu, Yichun
机构
[1] NE Normal Univ, Ctr Adv Optoelect Funct Mat Res, Changchun 130024, Peoples R China
基金
中国国家自然科学基金;
关键词
Phosphor; Red emission; Lithium europium double molybdate; Trivalent europium; White light-emitting diode; EU3+; CA;
D O I
10.1016/j.jlumin.2010.11.010
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Si4+ was introduced to the lattice of LiEuMo2O8 by solid-state reaction to prepare a new kind of red-emitting LiEuMo2-xSixO8 (0 < x <= 0.5) phosphors. The introduction of Si4+ ion caused the distortion and slight shrinking of the unit cell of LiEuMo2O8 material, and the blue-shift of the charge-transfer-absorption (CTA) band of LiEuMo2O8. Photoluminescence excitation (PLE) and photoluminescence measurements showed that the introduction of Si4+ was able to enhance the excitation efficiency of LiEuMo2O8 in NUV spectral region (360-400 nm). Consequently the red emission of LiEuMo2O8 phosphor was improved by 30% at x=0.2 under 395 nm light excitation, without loss of color purity. The enhanced red emission of LiEuMo2-xSixO8 was discussed in terms of the blue-shift of CTA band and the relaxation of parity-forbidden selection rules for trivalent europium luminescent centers. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:653 / 656
页数:4
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