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《Journal of The Chinese Rare Earth Society》 2002-06
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Laser Selective Excitation in Pr~(3+) Doped LaF+3 Nanocrystal/Oxyfluoride Glass Ceramics

Li Qingfu1*, Huang Shihua1, 2, Lu Shaozhe2, Liu Shuman1, Wang Xiaojun3,4, W.M.Yen4 (1. Institute of Optoelectronic Technique, Beijing 100044, China; 2. Laboratory of excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, China; 3. Department of Physics, Georgia Southern University, Statesboro, GA 30460, USA; 4. Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA)  
Spectroscopic properties of Pr3+ doped LaF3 nanocrystals/oxyfluoride glass ceramics were studied, Pr3+ ions in LaF3 nanocrystals and in oxyfluoride glass were distinguished by laser selective excitation, and there aren′t obvious interface effect, which is maybe a advantaged factor for luminescence. Surface or interface of nanocrystals diverges the local environments of the dopant, further broadens the inhomogeneous linewidth, and makes it increased in nanocrystals with decreasing the particle size. The dopant are enriched in nanocrystals, or nearby the interface, which enhance concentration within nanocrystals or local scope in nanocrystals, and increase the probability of crosstranstion, appear concentration quenching, so concentration quenching is responsible for short fluorescence lifetime of Pr3+ in LaF3 nanocrystals, where the Pr3+ ions are greatly enriched during annealing.
【Fund】: 中国国家重点基础研究发展规划-稀土功能材料的基础研究(G1998061309);; 美国NSF(DMR9986693)资助
【CateGory Index】: TQ174.1
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