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论文类型：期刊论文

发表时间：2009-02-01

发表刊物：JOURNAL OF LUMINESCENCE

收录刊物：SCIE、EI

卷号：129

期号：2

页面范围：110-113

ISSN号：0022-2313

关键字：Er3+-Y3+-codoped Al2O3 powders; Photoluminescence; Optical activity; Quantum efficiency

摘要：Enhanced photoluminescence (PL) mechanism of Er(3+)oped Al2O3 powders by Y3+ codoping at wavelength 1.53 mu m has been investigated through PL measurements of 0.1 mol% Er3+- and 0-20 mol% Y3+-codoped Al2O3 powders prepared at a sintering temperature of 900 degrees C in a non-aqueous sol-gel method. PL intensity and lifetime of Er3+-Y3+-codoped Al2O3 powders composed of gamma-(Al,Er,Y)(2)O-3 and theta-(Al,Er,Y)(2)O-3 phases increased with increasing Y3+-codoping concentration. The 10-20 mol% Y3+ codoping in 0.1 mol% Er3+-doped Al2O3 powders intensified the PL intensity by about 20 times, with a PL lifetime prolonged from 3.5 to 5.8 ms. A maximal increase of the optical activity of Er3+ in 0.1 mol% Er3+-Y3+-codoped Al2O3 powders about one order was achieved by 10-20 mol% Y3+ codoping. It is found that the improved PL properties for Er3+-Y3+-codoped Al2O3 powders are mainly attributed to enhanced optical activation of Er3+ in the Al2O3 by Y3+ codoping, and to the slightly increased radiative quantum efficiency of Er3+ in the Al2O3. (C) 2008 Elsevier B.V. All rights reserved.