Photostimulated luminescence phenomena in reduced rare earth ions containing glasses

Photostimulated luminescence phenomena have been observed in reduced rare earth ions i.e. Ce3+ and Eu2+, doped glasses. When the X-ray irradiated glasses were excited by a He-Ne laser (633 nm), photostimulated luminescence due to the 4f-5d transition of Ce3+ and Eu2+ ions was observed. X-ray absorption spectra of glasses X-ray irradiated for various durations were measured in order to examine the valence state and microstructure of the rare earth ions. In comparison with the mechanism of photostimulated luminescence in BaFBr:Eu2+, the luminescence is proposed to result from the photostimulated recombination of holes and electrons at traps which leave electrons in a long-lived excited state. These glasses may be promising materials as two-dimensional imaging sensors of X-ray. (author)