Charge transfer fluorescence and f–f luminescence in ytterbium compounds

Abstract

Abstract Luminescence and excitation spectra as well as decay kinetics are presented for the charge transfer (CT) luminescence of Lu 3 Al 5 O 12 , Y 3 Ga 5 O 12 and YAlO 3 crystals doped by Yb 3+ in various concentrations, the CT luminescence properties are compared to those of Y 3 Al 5 O 12 –Yb. For the first time the excitation spectra of the intraconfigurational 2 F 5/2 → 2 F 7/2 luminescence of Yb 3+ ions in YAG, LuAG and YAP in the region of the CT absorption band and in the fundamental absorption range up to 20 eV were measured, possible mechanisms of the energy transfer to Yb 3+ 4f states are discussed.