Thermoluminescence and Mechanoluminescence Properties of UV- Irradiated Ca2Al2SiO7:Ce3+, Tb3+ Phosphor

Rare earth activated, white light emitting Ca2Al2SiO7: Ce3+, Tb3+ phosphor was synthesized by combustion method at initiating temperature of 600 0C, using urea as a reducer. X – Ray diffraction, absorption spectra, thermoluminescence(TL) and mechanoluminescence (ML) were studied. The particle size was found to be 50.85 nm. The absorption spectra shows that the absorption edge is at λ = 240 nm. Two peaks were observed in the plot of time vs ML intensity. ML intensity increases with increasing droping height of the piston. The TL intensity was increased with increasing UV exposure time indicating the increase in concentration of trapped carriers with UV exposure. The TL emission spectra was found at 400 nm (UV-violet band) and 540 nm (green band).