物理化学学报 >> 2016, Vol. 32 >> Issue (8): 2108-2112.doi: 10.3866/PKU.WHXB201605091

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氟离子浓度对稀土掺杂上转换发光纳米材料形貌及荧光寿命的影响

刘珊珊1,2,徐征1,2,*(),赵谡玲1,2,梁志琴1,2,朱薇1,2   

  1. 1 北京交通大学发光与光信息技术教育部重点实验室,北京100044;
    2 北京交通大学光电子技术研究所,北京100044
  • 收稿日期:2016-03-07 发布日期:2016-07-29
  • 通讯作者: 徐征 E-mail:zhengxu@bjtu.edu.cn

Effects of F- Concentration on the Morphologies and Fluorescent Lifetimes of Ln3+-Doped Up-Conversion Nanocrystals

Shan-Shan LIU1,2,Zheng XU1,2,*(),Su-Ling ZHAO1,2,Zhi-Qin LIANG1,2,Wei ZHU1,2   

  1. 1 Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, Beijing 100044, P. R. China;
    2 Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, P. R. China
  • Received:2016-03-07 Published:2016-07-29
  • Contact: Zheng XU E-mail:zhengxu@bjtu.edu.cn

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摘要：

利用溶剂热法制备了Yb3+、Er3+共掺的NaYF4上转换发光纳米材料。实验结果表明，不同F-离子对纳米晶的晶型和粒径尺寸起着重要的作用。低F-离子浓度下，NaYF4纳米材料的粒径尺寸随F-离子浓度的增加逐渐变小且趋于均一；高F-离子浓度下，六方晶相的形成受到抑制，上转换纳米晶出现团聚现象。在一定浓度范围内，F-离子的浓度有利于促进荧光发射。同时F-离子浓度对荧光寿命也有显著的影响。

关键词: 上转换发光, 纳米材料, NaYF4, 形貌控制, 荧光寿命

Abstract:

Up-conversion luminescent NaYF4:Yb3+/Er3+ nanomaterials were synthesized using a solvo-thermal method. It was determined that the size, morphology, and luminescence intensity of these nanoparticles can be controlled by varying the concentration of fluoride ions. Low reactant concentrations were found to always result in monodisperse, hexagonal nanocrystals, and to gradually and uniformly decrease the size of the NaYF4 nanocrystals. In contrast, at higher concentrations, the nanocrystals grow to form a mixed phase. Fluoride ion concentrations over a specific range tend to promote the fluorescence emission of the material and may also significantly affect the fluorescent lifetime.

Key words: Up-conversion luminescent, Nanomaterial, NaYF4, Morphology control, Fluorescent llifetime