Enhanced luminescence and degradation of SiO2:Ce,Tb powder phosphors prepared by a sol-gel process

被引：52

作者：

Ntwaeaborwa, O. M.

Swart, H. C.

Kroon, R. E.

Holloway, P. H.

Botha, J. R.

机构：

[1] Univ Free State, Dept Phys, ZA-9300 Bloemfontein, South Africa

[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

[3] Nelson Mandela Metropolitan Univ, Dept Phys, ZA-6031 Port Elizabeth, South Africa

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2006年 / 67卷 / 08期

基金：

新加坡国家研究基金会;

关键词：

cathodoluminescence; degradation; photoluminescence; energy transfer;

D O I：

10.1016/j.jpcs.2006.04.002

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Enhanced green photoluminescence and cathodoluminescence (CL) from Tb3+ ions due to co-doping with Ce3+ ions were observed from SiO2:Ce,Tb powder phosphors prepared by a sol-gel technique. Blue emission from the Ce3+ ions was completely suppressed by Tb co-doping, presumably due to energy transfer from Ce3+ to Tb3+. In addition, the green CL intensity from SiO2:Ce,Tb degraded by similar to 50% when the powders were irradiated for 10h with a 2 keV, 54 mA/cm(2) beam of electrons in an ultra-high vacuum chamber containing either 1 x 10(-8) or 1 x 10(-7) Torr O-2. Desorption of oxygen from the surface was observed during the decrease of CL intensity. The mechanisms for energy transfer from Ce3+ ions to Tb3+ ions to enhance the green luminescence, and mechanisms for desorption of oxygen from the phosphor surface that would result in decreased CL intensity are discussed. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：1749 / 1753

页数：5

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