Interionic Energy Transfer in Y₃Al₅O₁₂: Ce³⁺, Pr³⁺, Cr³⁺Phosphor

Abstract

We present an investigation of dynamical processes of nonradiative energy transfer (ET) in Y3Al5O12:Ce3+, Pr3+, Cr3+ phosphor. The analysis based on Inokuti-Hirayama model indicates that the ET from the lowest 5d state of Ce3+ to the 4T2g state of Cr3+, and from the state 1D2 of Pr3+ to 4T2g state of Cr3+ are both governed by electric dipole-dipole interaction. For Pr3+ concentration of 0.005 in YAG: Pr3+ Cr3+ and for Ce3+ concentration of 0.01 in YAG: Ce3+ Cr3+ the rate constant and critical distance are evaluated to be 7.3×10−37 cm6s−1 and 0.22 nm for Pr3+ - Cr3+ ET and 1.03×10−36 cm6s−1 and 0.63 nm for Ce3+ - Cr3+ ET, respectively.