Analysis of Energy Transfer and Concentration Quenching in Sm -Activated Borate GdB 3 O 6 Phosphors by Means of Fluorescence Dynamics.

This article reports on the optical properties of Sm3+-activated GdB3O6phosphors based on the measurement of their photoluminescence spectra and luminescence decay curves. Energy transfer from Gd3+to Sm3+and the concentration quenching of the Sm3+ion emission are investigated. From the photoluminescence spectra and decay curves, the energy transfer from Gd3+to Sm3+is confirmed. The concentration quenching of the Sm3+ion emission can be ascribed to resonant cross-relaxation. The interaction between the Sm3+ions is derived of the electric dipole–dipole type through fitting the data with the Inokuti-Hirayama model. The critical distances and energy transfer microparameter for the transfer processes are given. The decay curves of Sm3+4G5/2level exhibiting a buildup and decay process also confirm the energy transfer from Gd3+to Sm3+and between Sm3+ions. [ABSTRACT FROM PUBLISHER]