Controlled synthesis of YF₃ nanocrystals with multiple morphologies in ethylene glycol

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• 作者：Congling Li^a ; ^b ; Yuanyuan Mei^a ; Jianjian Xie^a ; Wei Dai^b ; Gaohui Du^b ; ^{gaohuidu@zjnu.edu.cn} ; Zhengquan Li^a ; ^{zqli@zjnu.edu.cn}
• 关键词：Lanthanide nanocrystals ; Controlled synthesis ; Crystal growth ; Photoluminescent ; Upconversion
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：25 May, 2013
• 年：2013
• 卷：560
• 期：Complete
• 页码：10-14
• 全文大小：955 K

文摘

YF₃ is an important host matrix for lanthanides doping to give both strong down- and up-conversion luminescence with high quantum efficiency. Controlled synthesis of YF₃ nanocrystals is an efficient route to obtain different YF₃ nanocrystals satisfying for different applications and controlling their fluorescence. Here we present a facile approach to selectively synthesize different YF₃ nanocrystals using ethylene glycol (EG) as solvent. Five distinct morphologies can be conveniently obtained through changing the fluoride sources and chelating ligands in the EG solution. The prepared products were characterized and their formation mechanisms were proposed. After doped with different lanthanides, these samples can give both down- and up-conversion luminescence, suggesting that they are good nanoparticulate hosts. A comparison of fluorescent intensities between different products has been made, offering us an opportunity to study the relationship between fluorescence intensities and morphologies of YF₃ nanostructures. Our results suggest that formation of assemblies is a feasible way to enhance the fluorescence of lanthanide nanocrystals in addition to the size control.