Photoluminescence and Raman Spectra of Double-Perovskite Sr[sub 2]Ca(Mo/W)O[sub 6] with A- and B-Site Substitutions of Eu[sup 3+]

Abstract

A- and B-site substituted double-perovskite by have been synthesized using solid-state reactions and characterized by X-ray diffraction, Raman spectroscopy, and photoluminescence measurement. Raman spectra are used to identify the A- and B-site substitutions, because specific Raman peaks corresponding to different ions motion are sensitive to each situation. Raman data reveal that both the A- and B-site substituted solid solutions are formed. The photoluminescence intensity of the B-site substituted is evidently higher than that of the A-site substituted phosphor. The group introduced into acts as an energy obstacle to prevent energy transfer among groups, leading to more energy being trapped by , and a higher photoluminescence intensity is obtained. The phosphor with optimized composition shows a better luminescence intensity than the commercial phosphor under 395 nm excitations.