Fracto-mechanoluminescence and thermoluminescence properties of UV and -irradiated Ca2Al2SiO7:Ce3+ phosphor

Ce3+-doped calcium aluminosilicate phosphor was prepared by a combustion-assisted method at an initiating temperature of 600 degrees C. Structural characterization was carried out using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The absorption spectra of Ca2Al2SiO7:Ce3+ showed an absorption edge at 230 nm. The optical characterization of Ca2Al2SiO7:Ce3+ phosphor was investigated in a fracto-mechanoluminescence (FML) and thermoluminescence (TL) study. The peak of ML intensity increased as the height of impact of the moving piston increased. The TL intensity of Ca2Al2SiO7:Ce3+ was recorded for different exposure times of UV and -irradiation and it was observed that TL intensity was maximum for a UV irradiation time of 30 min and for a -dose of 1180 Gy. The TL intensity had three peaks for UV irradiation at temperatures 82 degrees C, 125 degrees C and 203 degrees C. Also the TL intensity had a single peak at 152 degrees C for -irradiation. The TL and ML emission spectra of Ca2Al2SiO7:Ce3+ phosphor showed maximum emission at 400 nm. The possible mechanisms involved in the TL and ML processes of the Ca2Al2SiO7:Ce3+ phosphor are also explained. Copyright (c) 2015 John Wiley & Sons, Ltd.