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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.
Ye et al. (Tue,) studied this question.