Spectral properties and energy transfer in Er^(3+)/Yb^(3+) codoped LiYF_4 crystal  

作　　者：汪沛渊 夏海平 彭江涛 胡皓阳 唐磊 张约品 陈宝玖 江浩川 

机构地区：[1]Key Laboratory of Photoelectronic Materials,Ningbo University [2]Department of Physics,Dalian Maritime University [3]Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences

出　　处：《Optoelectronics Letters》2013年第4期285-288,共4页光电子快报（英文版）

基　　金：the National Natural Science Foundation of China (Nos.51272109,50972061 and 61078061);the Natural Science Foundation of Zhejiang Province (No.R4100364);the Natural Science Foundation of Ningbo City (No.2012A610115);the K. C. Wong Magna Fund in Ningbo University

摘　　要：Laser crystals of LiYF4 (LYF) singly doped with Er3+ in 2.0% and co-doped with Er3+/Yb3+ in about 2.0%/1.0% molar fraction in the raw composition are grown by a vertical Bridgman method. X-ray diffraction (XRD), absorption spectra, fluorescence spectra and decay curves are measured to investigate the structural and luminescent properties of the crystals. Compared with the Er3+ singly doped sample, obviously enhanced emission at 1.5 μm wavelength and green and red up-conversion emissions from Er3+/Yb3+ co-doped crystal are observed under the excitation of 980 nm laser diode. Meanwhile, the emission at 2.7 μm wavelength from Er3+ singly doped crystal is reduced. The fluorescence decay time ranging from 18.60 ms for Er3+ singly doped crystal to 23.01 ms for Er3+/Yb3+ co-doped crystal depends on the ionic concentration. The luminescent mechanisms for the Er3+/Yb3+ co-doped crystals are analyzed, and the possible energy transfer processes from Yb3+ to Er3+ are proposed.Laser crystals of LiYF4 （LYF） singly doped with Er3＋ in 2.0% and co-doped with Er3＋/yb3＋ in about 2.0%/1.0% molar fraction in the raw composition are grown by a vertical Bridgman method. X-ray diffraction （XRD）, absorption spectra, fluorescence spectra and decay curves are measured to investigate the structural and luminescent properties of the crystals. Compared with the Er3＋ singly doped sample, obviously enhanced emission at 1.5 um wavelength and green and red up-conversion emissions from Er3＋/Yb3＋ co-doped crystal are observed under the excitation of 980 nm laser diode. Meanwhile, the emission at 2.7/am wavelength from Er3＋ singly doped crystal is reduced. The fluorescence decay time ranging from 18.60 ms for Er3＋ singly doped crystal to 23.01 ms for Er3＋/Yb3＋ co-doped crystal depends on the ionic concentration. The luminescent mechanisms for the Er3＋/Yb3＋ co-doped crystals are analyzed, and the possible energy transfer processes from Yb3＋ to Er3＋ are proposed.

关 键 词：LiYF4晶体 能量传递 共掺杂 掺铒 光谱性质 荧光衰减时间 垂直布里奇曼法 镱 

分 类 号：TN31[电子电信—物理电子学]