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 similar to2.5 h, and the other is longer. (C) 2002 Elsevier Science B.V. All rights reserved.