Luminescence behaviour of rare earth doped alkaline earth aluminates prepared by the halide route

Abstract

The fluorescence and long persistent phosphorescence behaviour of alkaline earth aluminates of the type MAl 2O 4 (M=Ba, Sr or Ca) doped with rare earth ions has been extensively studied in the literature. These phosphors are usually prepared using their oxides as the starting materials and employing temperatures in excess of 1000 °C. In this paper, we report the possibility of synthesizing the alkaline earth aluminates starting from the alkaline earth halides. The operating temperatures are around 900 °C, yet single-phase materials with high luminescence output have been realized.