Size-dependent upconversion luminescence in CaF₂:Yb^3 +,Tm^3 + nanocrystals

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• 作者：Tao Jiang ; Weiping Qin ; ^{wpqin@jlu.edu.cn} ; Dan Zhao
• 关键词：Luminescence ; Nanoparticles ; Size effect
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：1 May, 2012
• 卷：74
• 期：Complete
• 页码：54-57
• 文件大小：546 K

摘要

CaF₂:Yb,Tm nano- and micro-crystals with different sizes were synthesized by a simple hydrothermal method. All the nanocrystals present intense ultraviolet (UV), visible, and near infrared (NIR) upconversion (UC) luminescence. The relationship between the UC luminescence intensities and the sample sizes from 50 nm to 1200 nm was investigated. The UV UC luminescence intensity of the sample with the particle size around 600 nm was the highest among all the samples, but the NIR UC luminescence intensity of the sample was the lowest. Our experimental results indicated that there was a size between 50 nm and microscale at which the UV emission intensity was the highest for CaF₂ matrix. The size-dependent UC luminescence was proposed and analyzed based on experimental data.