Synthesis and white upconversion emission of NaGdF4: Er3+, Tm3+, Yb3+ phosphors

被引：0

作者：

Li, Yan-Hong ^{[1
]}

Zang, Guo-Feng ^{[1
]}

Zhang, Xing-Ao ^{[2
]}

机构：

[1] School of Material Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

[2] College of Chemistry, Liaoning University, Shenyang 110036, China

来源：

Guangdianzi Jiguang/Journal of Optoelectronics Laser | 2014年 / 25卷 / 07期

关键词：

Hydrothermal synthesis - Sodium compounds - Rare earths - Gadolinium compounds - Luminescence - Metal ions - Ytterbium compounds - Fluorine compounds - Laser excitation;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A series of NaGdF4: Er3+, Tm3+, Yb3+ upconversion luminescence phosphors with different Yb3+ ion concentrations were prepared by a hydrothermal method under 180°C for 24 h, in which the molar ratio of NaF to rare earth ions is 5:1. The structure and upconversion luminescence are characterized. The results of XRD indicate that all the samples are hexagonal phase NaGdF4. The interplanar spacing of NaGdF4 phase is slightly affected by Yb3+ ions concentration. Under 980 nm laser excitation, the upconversion luminescence spectra of samples show green emission from 2H11/2→4I15/2 and 4S3/2→4I15/2 transitions of Er3+ ions, red emissions attributed to 4F9/2→4I15/2 transitions of Er3+ ions, respectively, and blue emissions assigned to 1G4→3H6 transitions of Tm3+ ions. The relative intensities of green to red emission and blue to red emission are governed by Yb3+ ions concentration in NaGdF4: Er3+, Tm3+, Yb3+ phosphors, respectively. The possible upconversion luminescence mechanisms of the samples are discussed. NaGdF4: 0.05%Er3+, 0.3%Tm3+, 50%Yb3+ phosphors exhibit bright white light under 980 nm laser excitation, and the calculated CIE color coordinates are (0.342, =0.331). The white upconversion luminescence from NaGdF4: Er3+, Tm3+, Yb3+ phosphors can be realized by adjusting the Yb3+ ions concentration.

引用

页码：1350 / 1354