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.
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)
