Luminescence properties of (Ca1-xSrx)Se:Eu2+ phosphors for white LEDs application

被引：47

作者：

Zhang, XM

Liang, LF

Zhang, JH

Su, Q ^{[1
]}

机构：

[1] Zhongshan Univ, State Key Lab Optoelect Mat & Technol, Sch Chem & Chem Engn, Guangzhou 510275, Peoples R China

[2] Guangxi Normal Coll, Dept Chem, Nanning 530001, Guangxi, Peoples R China

来源：

MATERIALS LETTERS | 2005年 / 59卷 / 07期

关键词：

luminescence; phosphors; alkaline-earth selenide; europium; white LEDs;

D O I：

10.1016/j.matlet.2004.11.014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Novel phosphors of EU2+-doped (Ca1-xSrx)Se for the application of white light emitting diodes (LEDs) were prepared by conventional solid-state reaction. Diffuse reflection spectra of CaSe, SrSe, CaSe:Eu2+ and SrSe:EU2+ were measured. The excitation spectra consisted of two broad bands and were consistent with the diffuse reflectance spectra. The emission band is due to the 4f(6)5d(1) --> 4f(7) transition of the EU2+ ion. With an increase in x, the emission band shifted to shorter wavelength and the reason was discussed. The fluorescence lifetimes of EU in (Ca1-xSrx)Se:0.04Eu(2+) were also measured and the values were reasonable for the allowed transition 4f(6)5d(1)-->4f(7) r in EU2+. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：749 / 753

页数：5

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