Photoluminescence and Thermoluminescence Properties of Rare Earth Doped CaAl2Si2O8 phosphors

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Tbe doped Calcium alumino silicate (CaAl2Si2O8) phosphor was synthesized by combustion method at initiating temperature of 7000C, using urea as a reducer. XRD, Thermoluminescences, absorption spectra, FTIR and Thermoluminescences spectra were recorded. The X-ray diffraction pattern indicates that the crystal structure of CaAl2Si2O8is mainly triclinic phase. The absorption spectra shows that the absorption edge is at  = 240nm. The TL intensity was recorded for different exposure time of γ -irradiation and it was observed that TL intensity is maximum for 1180Gy exposure time. We have calculated the trap depth by initial rise methods. The TL emission spectra has maximum at 540 nm. Mechanism involved in TL is also suggested.