Eu3+ activated novel alkaline earth metal gallium oxide phosphors: Sr(2.92−x)Ca(x)Ga2O6:Eu3+0.08 for light emitting diodes

Present study deals with Eu3+ activated novel alkaline earth metal (Sr and Ca) gallium oxide phosphors, Sr(2.92−x)Ca(x)Ga2O6:Eu3+0.08 (x = 0 to 2.92). Crystal structure, morphology and luminescence (excitation, emission and CIE coordinate) properties of these phosphors have been studied as a function of Ca concentration. Doping of Ca ions into Sr2.92Ga2O6:Eu3+ phosphor gives rise to a significant enhancement in overall fluorescence and the optimum emission is attained for pure Ca2.92Ga2O6:Eu3+ phosphor for x = 2.92. The intensity ratio of 5D0 → 7F2 to 5D0 → 7F1 transitions (monochromaticity) of Eu3+ for different doping concentration of Ca suggests that asymmetry around the Eu3+ ion increases with increase in Ca ion concentration, which is responsible for enhanced emission. The excellent optical features, such as broad excitation band (230–480 nm) and excellent emission in red region (at 614 nm), conclude that calcium gallet phosphor could be a potential candidate for light emitting diodes and display applications.