Synthesis and luminescence properties of Er³⁺-doped Lu₃Ga₅O₁₂ nanocrystals

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• 作者：V. Venkatramu ; D. Falcomer ; A. Speghini ; M. Bettinelli ; C.K. Jayasankar
• 关键词：Nanocrystals ; Luminescence ; Erbium
• 刊名：Journal of Luminescence
• 出版年：2008
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：May-June 2008
• 卷：128
• 期：5-6
• 页码：811-813
• 文件大小：164 K

摘要

The concentration-dependent luminescence properties of sol–gel-derived nanocrystalline Lu_3(1−x)Er_3xGa₅O₁₂ powders (where x=0.01, 0.05 and 0.1) have been studied. Laser-excited luminescence spectra, emission decays and upconversion luminescence of Er³⁺-doped Lu₃Ga₅O₁₂ nanocrystalline samples have been measured. The decay curve of the (²H_11/2,⁴S_3/2) emission exhibits a non-exponential behavior presumably due to cross-relaxation process. Moreover, near-infrared to visible upconversion luminescence has been observed in the green region for 1.0 mol%Er³⁺ ions in Lu₃Ga₅O₁₂ nanocrystals upon 815 nm excitation. The power dependence of the anti-Stokes luminescence suggests that upconversion is probably achieved through the sequential absorption of two photons. To the best of our knowledge, this is the first report on the preparation and optical properties of Er³⁺-doped Lu₃Ga₅O₁₂ in the form of nanocrystalline powders.