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Reducing Grain Size and Enhancing Luminescence of NaYF4:Yb3+, Er3+ Upconversion Materials
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-01-10 00:00:00 , DOI: 10.1021/acs.cgd.7b01274
Lihua He 1 , Xiao Zou 1 , Xiang He 1 , Fengying Lei 1 , Na Jiang 1 , Qiaoji Zheng 1 , Chenggang Xu 1 , Yongfu Liu 2 , Dunmin Lin 1
Affiliation  

A variety of NaYF4:Yb/Er upconversion materials were successfully synthesized via a facile hydrothermal method by altering the volume ratios (0:1, 1:1, 2:1, 3:1, 4:1, 5:1) of ethanol to water and various alcohols (methanol, n-propyl alcohol, isopropyl alcohol, ethylene glycol, polyethylene glycol, and phemethylol), and the grain size and luminescence of the materials were effectively tailored. The addition of alcohol effectively reduces the grain size of the materials and simultaneously leads to the surprising enhancement of the UC emission. The increase in the volume ratio of EtOH/H2O causes the transformation of the crystal structure of the materials from hexagonal to cubic phase. The particle size of the material with the EtOH/H2O of 2:1 is almost 1000 times smaller than that of the material without EtOH, and the strongest luminescence is observed at the EtOH/H2O of 2:1. The type of alcohol in the solvent exhibits a significant influence on the luminescent properties of the materials. The NaYF4:Yb/Er nanocrystals obtained using different alcohols as solvent possess much a smaller grain size and stronger upconversion luminescence than that using water as solvent, and the NaYF4:Yb/Er materials with n-propyl alcohol exhibit the strongest luminescence intensity. The mechanism of the reduction of grain size and enhancement in the luminescence of the NaYF4:Yb3+, Er3+ upconversion materials has been proposed. This study may suggest a simple method to significantly reduce the grain size and improve the upconversion luminescence properties of NaYF4-based fluorescence material.

中文翻译:

减小晶粒尺寸并增强NaYF 4:Yb 3+,Er 3+上转换材料的发光

通过改变水合物的体积比(0:1、1:1、2:1、3:1、4:1、5:1),通过简便的水热方法成功地合成了多种NaYF 4:Yb / Er上转换材料。乙醇与水和各种醇(甲醇,ñ丙基醇,异丙基醇,乙二醇,聚乙二醇,和phemethylol),并且晶粒尺寸和材料的发光被有效定制。醇的添加有效地减小了材料的晶粒尺寸,并且同时导致了UC排放的出人意料的增强。EtOH / H 2 O的体积比的增加导致材料的晶体结构从六方相转变为立方相。含EtOH / H 2的材料的粒径2:1的O几乎比没有EtOH的材料小1000倍,并且在2:1的EtOH / H 2 O处观察到最强的发光。溶剂中的醇类型对材料的发光性能有重要影响。的NaYF 4:使用不同的醇作为溶剂,所得到的Yb / ER的纳米晶体具有很多较小的晶粒尺寸和更强的上转换发光比使用水作为溶剂,和NaYF 4:镱/铒的材料与Ñ丙基醇表现出最强的发光强度。NaYF 4:Yb 3+,Er 3+的晶粒尺寸减小和发光增强的机理已经提出了上转换材料。这项研究可能建议一种简单的方法来显着减小晶粒尺寸并改善基于NaYF 4的荧光材料的上转换发光性能。
更新日期:2018-01-10
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