Comparative spectroscopic investigation of Dy3+ ions in different sesquioxide solid solution ceramics

A comparative study of the spectroscopic properties of LuScO3:Dy, LuYO3:Dy, and YScO3:Dy was conducted to evaluate their application prospects in yellow laser generation. The absorption cross sections of Dy-doped LuScO3, LuYO3, and YScO3 at 446 nm were calculated to be 0.67, 1.51, and 1.05 x 10(-21) cm(2), respectively. The Judd-Ofelt (J-O) theory was used to determine the J-O parameters as well as the spontaneous transition probability and fluorescence branching ratios. The fluorescence spectra of LuScO3:Dy, LuYO3:Dy, and YScO3:Dy were dominated by yellow emission corresponding to the F-4(9/2) -> H-6(13/2) transition, with cross sections of 0.78, 1.10, and 0.76 x 10(-20) cm(2), respectively. The Inokuti-Hirayama model was applied to fit the non-exponential decay curve of Dy-doped sesquioxide solid solution ceramics in order to investigate the process of energy transfer. The impact of bond length and distortion degree on spectral properties and energy-transfer parameters was investigated. It was concluded that among Dy-doped sesquioxide solid solutions, LuYO3:Dy ceramics are the most promising materials for generating yellow lasers.