Ion-ion interactions in β-NaGdF4:Yb3+, Er3+ nanocrystals - the effect of ion concentration and their clustering

被引：36
|
作者：
Noculak, A. [1 ]
Podhorodecki, A. [1 ]
Pawlik, G. [2 ]
Banski, M. [1 ]
Misiewicz, J. [1 ]
机构：
[1] Wroclaw Univ Technol, Dept Expt Phys, PL-50370 Wroclaw, Poland
[2] Wroclaw Univ Technol, Dept Theoret Phys, PL-50370 Wroclaw, Poland
来源：
NANOSCALE | 2015年 / 7卷 / 32期
关键词：
UP-CONVERSION LUMINESCENCE; COMPUTED-TOMOGRAPHY; NANOPARTICLES; SIZE; ULTRASMALL; YB3+; EMISSION; DYNAMICS; PROBES; PHASE;
D O I：
10.1039/c5nr03385c
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In this work we report co-thermolysis as a suitable method for nanomaterial synthesis which allows the creation of hexagonal upconverting nanocrystals, NaGdF4:Yb3+,Er3+, in a wide range of sizes (20-120 nm). Only a very high Yb3+ concentration (above 70%) results in pure cubic-phase nanocrystals with irregular shape. Additionally, we showed that the impact of Yb3+, Er3+ and Gd3+ ions on the size and optical properties of nanocrystals is significant. We found that the main changes in optical properties do not depend on the nanocrystal size mostly, but are determined by the ion-ion interactions which include both Er3+-Er3+ and Er3+-Yb3+ cross relaxation.
引用
收藏
页码：13784 / 13792
页数：9
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