Photoluminescence Characteristics of Nanocrystalline ZnGa_2O_4 Phosphors Obtained at Different Sintering Temperatures

摘要

A nano-sized ZnGa_2O_4 phosphor was synthesized via a precipitation method (at a low temperature) and then sintered at various temperatures. X-ray diffraction (XRD) analysis confirmed that single-crystalline ZnGa_2O_4 particles were formed. A pure ZnGa_2O_4 phase was obtained at a sintering temperature of 1000 deg C. The average size of the spherical ZnGa_2O_4-phosphor particles increased with increasing sintering temperature. The most intense photoluminescence (PL) peak -corresponding to blue emission at about 420 nm - was observed for the sample prepared at a sintering temperature of 1000 deg C.