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

被引：79

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

页码：3164 / 3169

页数：6

共 46 条

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