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Photostimulated and thermally stimulated charge transfer between impurity ions and intrinsic defects in Y3Al5O12

The ESR method was applied to a Y 3 Al 5 O 12 crystal at 300 K to establish a photostimulated charge transfer in iron and chromium impurity ion systems at 450-320 nm: Fe 2+ → Fe 3+ , Cr 3+ → Cr 2+ . Near 150 K, the thermally stimulated and photostimulated change in the valence state of chromium, iron, and intrinsic defects, and the recombination processes are governed by electron traps with activation energy ∼0.14 eV. Apart from the initial stage, the charge recombination is satistactorily represented by the Forster equation