Light-induced change of charge transfer band in one europium doped aluminosilicate glass

Ultraviolet light-induced spectral change in one Eu3+ doped aluminosilicate glass was studied. It was observed that the excited charge-transfer band decreased after irradiation. The intensity at the irradiated site decreased linearly with the power density of the irradiation light. This means that the light-induced change is a one-photon process. Irradiations at different wavelengths indicate that the spectral change is frequency-selective. The dark decay of the spectral change was also studied. At least two time constants were obtained. One constant is ∼2.5 h, and the other is longer.