The effects of radiative-trapping and fluorescence-concentration quenching on the emission spectra and fluorescence lifetimes of Yb<sup>3+</sup>-doped YAl<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> crystals with a series of Yb<sup>3+</sup> concentrations were studied. The shift of barycenters in emission spectra, Δλ, was proposed as an appraisement of the radiative-trapping effect on the spectra, and an empirical relation between Δλ and Yb<sup>3+</sup> concentration in the Yb:YAl<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> crystals was deduced. The model of excitation random walk was used to analyze the effects of radiative trapping and concentration quenching on the fluorescence lifetimes. The relation between fluorescence lifetime and Yb<sup>3+</sup> concentration was obtained.
© 2006 Optical Society of America
Original Manuscript: June 9, 2006
Revised Manuscript: September 6, 2006
Manuscript Accepted: September 7, 2006
Jinsheng Liao, Yanfu Lin, Yujin Chen, Zundu Luo, En Ma, Xinghong Gong, Qiguang Tan, and Yidong Huang, "Radiative-trapping and fluorescence-concentration quenching effects of Yb:YAl3(BO3)4 crystals," J. Opt. Soc. Am. B 23, 2572-2580 (2006)