Effect of OH^- on fluorescence properties in 1.5-1.6 μm for Er:Yb:YCOB crystal  

作　　者：Degao Zhong Chen Hu Shakir Ullah Hui Xu Jianhong Li Fei You Dongjuan Wang Shijia Sun Weijin Kong Jie Tang Zhenghe Yu Bing Teng 

机构地区：[1]College of Physics,Qingdao University,Qingdao 266071,China [2]National Demonstration Center for Experimental Applied Physics Education (Qingdao University),Qingdao 266071,China [3]CRYSTECH Inc.,Qingdao 266107,China [4]Institute o f Engineering Materials,Weifang Business Vocational College,Weifang 262234,China

出　　处：《Journal of Rare Earths》2019年第9期924-930,I0001,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(11204148,11374170);Major Basic Research Projects of Shandong Natural Science Foundation(ZR2018ZB0650);China Postdoctoral Science Foundation(2015M580573);the Applied Basic Research Programs for Youths of Qingdao(15-9-1-52-JCH);Taishan Scholar Program of Shandong Province;the Qingdao Postdoctoral Application Research Project(2015127);the Open Projects of State Key Laboratory of Rare-earth Resource Utilization(RERU2016015)

摘　　要：FTIR absorption spectra indicate that H^+can easily enter the crystal structure and form OH^-centers in Er:Yb:YCOB and O-H bonds prefer to lie in the a-c plane.Within our current studied concentration level,crystal samples with higher OH-abso rption coefficie nts demonstrate stro nger fluo rescence intensity and longer fluorescence lifetime at 1535 nm.As the stretching vibration energy of OH-group approximately corresponds to the energy gap between the 4 I11/2 and 4 I13/2 levels of Er^3+,and thus,OH^-ions can shorten the fluorescence lifetime of Er^3+-4I11/2 level by the phonon-assisted cross-relaxation process between the Er^3+and OH-ions.Our curre nt results confirm that a certain conte nt of OH ions can enhance the ene rgy transfer process from Yb^3+to Er^3+and subsequently promote fluorescence output in 1.5-1.6μm.FTIR absorption spectra indicate that H+ can easily enter the crystal structure and form OH-centers in Er:Yb:YCOB and O—H bonds prefer to lie in the a-c plane. Within our current studied concentration level,crystal samples with higher OH-abso rption coefficie nts demonstrate stro nger fluo rescence intensity and longer fluorescence lifetime at 1535 nm. As the stretching vibration energy of OH-group approximately corresponds to the energy gap between the 4 I11/2 and 4 I13/2 levels of Er3+, and thus, OH-ions can shorten the fluorescence lifetime of Er3+-4I11/2 level by the phonon-assisted cross-relaxation process between the Er3+ and OH-ions. Our curre nt results confirm that a certain conte nt of OH ions can enhance the ene rgy transfer process from Yb3+ to Er3+ and subsequently promote fluorescence output in 1.5-1.6 μm.

关 键 词：Er:Yb:YCOB CRYSTAL OH^-ions FLUORESCENCE OUTPUT efficiency Energy transfer process RARE earths 

分 类 号：O734[理学—晶体学]