Up-conversion properties of Yb,Tb:YAG single crystals grown by the micro-pulling-down method

Jian Liu (1) , Qingsong Song (1) , Jie Xu (2) , Jun Guo (2) , Yuxin Pan (3) , Na Li (4) , Dongzhen Li (2) , Peng Liu (2) , Xiaodong Xu (2) , Jun Xu (1) , Kheirreddine Lebbou (5)

1 Tongji University
2 JSNU - Jiangsu Normal University
3 University of Shanghai for Science and Technology
4 Jinzhong University
5 iLM - LUMINESCENCE - iLM - Luminescence

Yb,Tb:YAG crystals with various Yb 3+ and Tb 3+ concentration were grown by the micro-pulling-down technique (µ-PD). The absorption spectra, fluorescence spectra and fluorescence decay curves of Yb,Tb:YAG crystals were measured at room temperature. Under 980 nm excitation, Yb,Tb:YAG crystals exhibited intense visible up-conversion luminescence due to the cooperative energy transfer from two Yb 3+ ions to one Tb 3+ ion. Under 4850 nm excitation, Yb,Tb:YAG crystals yielded near-infrared down-conversion emission, ascribing to the cooperative absorption of pumping photons and cooperative energy transfer from one Tb 3+ ion to two Yb 3+ ions. The energy transfer processes from Yb 3+ ions to Tb 3+ ions were discussed, and the energy transfer efficiency was calculated. The results show that Yb,Tb:YAG crystal is promising for visible laser output when pumped by InGaAs laser diode (LD).

Mots clés: Energy transfer; Visible emission; Micro-pulling-down method; Up-conversion; Energy transfer; Micro-pulling-down technique; Visible laser; Energy transfer; Energy transfer

Domaines: Sciences de l'ingénieur [physics]; Chimie; Physique [physics]

Jian Liu, Qingsong Song, Jie Xu, Jun Guo, Yuxin Pan, et al.. Up-conversion properties of Yb,Tb:YAG single crystals grown by the micro-pulling-down method. Journal of Luminescence, 2022, 246, pp.118826. ⟨10.1016/j.jlumin.2022.118826⟩. ⟨hal-03687027⟩