On the Luminescence of Sm3+, Gd3+, and Dy3+ in Yttrium Aluminium Borate

Abstract

AbstractConcentration quenching of the luminescence in Y1−xRExAl3B4O12 (RE = Sm, Gd, Dy;0 < x ≦ 1) is examined. In the case of gadolinium compound the quenching is due to energy migration among the Gd3+ ions to quenching centres. From the decay curve of GdAl3B4O12 a lower limit for the diffusion constant at 300 K is derived. The quenching of the Sm3+ and Dy3+ ion emission can be ascribed to resonant cross‐relaxation. The interaction between the ions is probably of the electric dipole‐dipole type. The critical concentrations for the transfer processes are given.