Effect of X-Ray Radiation on the Valence State of Europium in Y2O3:Eu3+ Phosphor

Resumo

The effect of X-ray radiation on the valence state of europium ions in the Y₂O₃ matrix was studied by EPR. The alternation of the charge of europium ions (Eu³⁺ → Eu²⁺ → Eu³⁺) in the Y₂O₃ structure was detected. The mechanism of europium reduction to the divalent state under the action of X-ray irradiation is described.