An abnormal fluorescence intensity ratio between two green emissions of Er^(3+) caused by heating effect of 980 nm excitation  

作　　者：周少帅 李心悦 曹中民 段昌奎 陈永虎 尹民 

机构地区：[1]Department of Physics,University of Science and Technology of China

出　　处：《Journal of Rare Earths》2015年第10期1031-1035,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(11374291,11274299 and 11204292)

摘　　要：An abnormal fluorescence intensity ratio （FIR） between two green emissions of Er3＋, at room temperature, which is larger than a normal value, emerged in many reported articles. However, up to now detailed work has seldom been done to clarify this abnormal phenomenon. In this paper, green upconversion luminescence of the β-NaLuF4：20%yb3＋,2%Er3＋ powder sample was investigated under 980 um excitation at different circumstances, different pump power densities and different temperatures as well as different air pressures. The corresponding local temperature calculated using FIR technique increased gradually with the enhancement of the pump power density. It was demonstrated that high pump power density of 980 nm laser led to the increase of local temperature of the luminescent material, which further gave the abnormal FIR.An abnormal fluorescence intensity ratio （FIR） between two green emissions of Er3＋, at room temperature, which is larger than a normal value, emerged in many reported articles. However, up to now detailed work has seldom been done to clarify this abnormal phenomenon. In this paper, green upconversion luminescence of the β-NaLuF4：20%yb3＋,2%Er3＋ powder sample was investigated under 980 um excitation at different circumstances, different pump power densities and different temperatures as well as different air pressures. The corresponding local temperature calculated using FIR technique increased gradually with the enhancement of the pump power density. It was demonstrated that high pump power density of 980 nm laser led to the increase of local temperature of the luminescent material, which further gave the abnormal FIR.

关 键 词：UPCONVERSION fluorescence intensity ratio heating effect rare earths 

分 类 号：TQ422[化学工程]