Synthesis and optical characterization of novel Sr3Ga2O6:Eu3+ phosphor

Abstract

Alkaline earth metal gallets have been identified as an important ceramic material. The crystal chemistry of many of these gallets is well explored; however, very rare studies regarding optical properties of rare earth (RE) ions doped in such gallets, particularly in Sr3Ga2O6 host, have been carried out. The present study reports on synthesis and characterization of novel Sr3Ga2O6:Eu3+ phosphors. The phosphors have been synthesized using a conventional solid state reaction method. Crystal structure, morphology and luminescence properties (excitation, emission and CIE coordinate) of these phosphors have been studied as a function of sintering temperature and Eu3+ concentration. X-ray diffraction study reveals that the phosphor sintered at low temperature (900°C) contains an impurity phase which is removed at higher sintering temperatures and results into cubic crystalline phase of Sr3Ga2O6. Particle size of the phosphor increases with an increase in sintering temperature which results to a red shift in the peak position of excitation band lying in a broad range from 250 to 370nm. Optimum emission intensity is attained for 0.12mol% concentration of Eu3+ ions; above this concentration, a quenching in emission intensity is observed.