Eu3+ doped KYF4 nanocrystals: synthesis, electronic structure, and optical properties

被引：78
作者：
Wang, Yanhua [1 ,2 ,3 ]
Liu, Yongsheng [1 ,2 ]
Xiao, Qingbo [1 ,2 ]
Zhu, Haomiao [1 ,2 ]
Li, Renfu [1 ,2 ]
Chen, Xueyuan [1 ,2 ]
机构：
[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, Key Lab Optoelect Mat Chem & Phys, Fuzhou 350002, Fujian, Peoples R China
[2] State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
来源：
NANOSCALE | 2011年 / 3卷 / 08期
关键词：
UP-CONVERSION; NAYF4; NANOCRYSTALS; LUMINESCENCE; EMISSION; SIZE; INTENSITIES; STRATEGY; SPECTRA; PHASE; ER3+;
D O I：
10.1039/c1nr10341e
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Monodisperse cubic-phase KYF4 : Eu3+ nanocrystals (NCs) were synthesized via a modified thermal decomposition method. The optical properties of Eu3+ in KYF4 NCs including multiple luminescence centers, site symmetry, luminescence dynamics, as well as crystal-field levels of Eu3+ were investigated in detail based on high-resolution photoluminescence (PL) spectroscopy at low temperature (10 K). Different from Eu3+ in bulk counterparts, multiple sites of Eu3+ in KYF4 NCs were revealed by using the luminescence of Eu3+ as a sensitive structural probe. The highest site symmetry of Eu3+ at new near-surface site was deduced to be distorted from O-h to D-2 (or C-2v). Due to a small filling factor (0.45) of NCs, the PL lifetime of D-5(0) of Eu3+ in KYF4 NCs was much longer than that in bulk counterparts, which was found to be significantly affected by the surrounding medium around the NCs.
引用
收藏
页码：3164 / 3169
页数：6
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