Combustion synthesis and luminescent properties of MIn2O4:xTb (M = Ca and Sr) phosphors

Terbium-activated (M1−xTbx)In2O4 (M = Ca and Sr, x = 0.12, 0.5,1.0,1.5 and 2%) phosphors have been synthesized by combustion route using urea as a fuel in a pre-heated furnace at 500 °C. The phosphors characteristic such as photoluminescence, crystallinity and particle morphology were investigated with different level of Tb3+ doping. The prepared phosphors under UV source revealed green luminescence that was attributed to the transition from 5D4 excited state to 7F5 ground state of Tb3+ ions. Qualitative analysis of the phosphors has been performed by energy-dispersive analysis (EDAX). The powder X-ray diffraction (XRD) of the phosphor was also studied and reported.