Effects of Sr~(2+) substitution on photoluminescence characteristics of Ba_(1-x-y)Sr_yZrSi_3O_9:xEu~(2+) phosphors

摘要

In this work, single-phase Ba_(1-x-y)Sr_yZrSi_3O_9:xEu~(2+) phosphors were synthesized via the solid-state reaction method. The crystal structure and luminescence properties were investigated using X-ray diffraction and photoluminescence measurements, respectively. An increase of the dopant Sr~(2+) increased the emission intensity of the phosphors. The peak intensity of the samples was at y = 0.4 under near-ultraviolet light excitation (397 nm). The wavelength of the emission peaks red-shifts slightly from 477 to 483 nm due to the splitting of the 5d energy level. Sr~(2+) ions have a smaller ionic radius than that of Ba~(2+) ions, and thus the dopant changes the crystal structure, improving the energy transfer efficiency between luminescence centers. More Eu~(2+) solid solubility was found in Ba_(1-x-y)Sr_yZrSi_3O_9:xEu~(2+) phosphors (10 mol. %) than in the host BaZrSi_3O_9 (6 mol. %), which enhanced the emission intensity. In addition, the thermal reliability of the phosphors was studied.