標題: Physical characteristics and infrared fluorescence properties of sol-gel derived Er3+-Yb3+ codoped TiO2
作者: Ting, CC
Chen, SY
Lee, HY
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-Aug-2003
摘要: Er3+-Yb3+ codoped TiO2 films were prepared on fused silica by sol-gel processes. The Yb3+ codoping effect on the physical characteristics and similar to1.54 mum photoluminescence (PL) properties of Er3+-doped TiO2 films was investigated. Maximum similar to1.54 mum PL intensity occurs in Er3+ (5 mol %)-Yb-3+ (30 mol %) codoped TiO2 samples annealed at 700degreesC. However, when the concentration of Yb3+ ions is more than 30 mol %, the back energy transfer effect from Er3+ to Yb3+ will deteriorate the similar to1.54 mum PL efficiency. Extended x-ray absorption fine structure measurements show that the average spatial distance between Er3+ ions is slightly decreased due to the partial substitution of Yb3+ for Er3+ ions in the local structure. The Yb3+ ion in the Er3+-Yb3+ codoped TiO2 samples not only plays the role of disperser but is also a sensitizer of the Er3+ ion. This dual effect leads to larger PL intensity in the Er3+-Yb3+ codoped TiO2 system in comparison with Er3+-Y3+ codoped TiO2 samples. Compared with SiO2 films with Er3+ (5 mol%)-Yb3+ (30 mol %) codoped and annealed at optimal temperature of 985degreesC, the Er3+ -Yb3+ codoped TiO2 film obtains better PL properties at lower annealing temperature. (C) 2003 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.1590411
http://hdl.handle.net/11536/27649
ISSN: 0021-8979
DOI: 10.1063/1.1590411
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 94
Issue: 3
起始頁: 2102
結束頁: 2109
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