Photoluminescence behaviour of Gd doped barium hexaferrite

Abstract

This paper reports synthesis of Barium Hexaferrite with different concentration of Gadolinium ion (0-2 mol %). Structural analysis of the prepared powders was done by X-ray diffraction pattern which reveals formation of hexagonal structure with space group p63/mmc. The FTIR and EDX spectra depict formation and composition of Barium Hexaferrite respectively. Agglomeration was observed from the SEM image of the prepared sample. Photoluminescence studies of the prepared samples show intensified PL emission peaks at 658 nm under ultraviolet (UV) excitation at 230 nm due to the optical transition 6G7/2 to 6P5/2 which arises because of the defects produced by doping of Gadolinium ion into the host lattice. Due to cross relaxation process PL intensity decreases after 1.5 mol% of doping concentration. CIE (commission International de) coordinates and CCT (correlated colour temperature) were also determined for the prepared samples which indicate that the powder samples show intense red cool emission.