Solvothermal synthesis and upconversion spectroscopy of monophase hexagonal NaYF₄:Yb³⁺/Er³⁺ nanosized crystallines

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• 作者：Jing Guo ; Feizhong Ma ; Shuangna Gu ; Ying Shi ; ^{yshi@shu.edu.cn} ; Jianjun Xie
• 关键词：NaYF4 ; Yb/Er ; Solvothermal synthesis ; Hexagonal ; Upconversion
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 May, 2012
• 卷：523
• 期：Complete
• 页码：161-166
• 文件大小：1308 K

摘要

The synthesis of single-phase hexagonal NaYF₄:Yb³⁺/Er³⁺ upconversion phosphors was investigated by a facile solvothermal processing. It was found that solvents adopted could influence the phase composition, morphology and luminescence property of resultant NaYF₄ nanosized crystals greatly. When a mixture of oleic acid-glycol-ethanol was used as solvent, the monophase hexagonal NaYF₄:Yb³⁺/Er³⁺ nanocrystals were successfully obtained, which exhibited nanorods morphology with a longitude of about 200 nm and a diameter of 50-80 nm. By co-doping Yb³⁺ and Er³⁺, hexagonal NaYF₄ nanorods emitted bright upconversion luminescence at 530 nm and 652 nm under excitation of 980 nm, which was much superior than those of NaYF₄:Yb³⁺/Er³⁺ particles synthesized in other solvents such as deionized water, ethanol, glycol and oleic acid.