Photoluminescence and raman spectra of double-perovskite Sr2Ca(Mo/W)O6 with A- and B-site substitutions of Eu3+

A- and B-site substituted double-perovskite Sr(2)CaMoO(6) by Eu(3+) 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 Sr(2)CaMoO(6) is evidently higher than that of the A-site substituted phosphor. The WO(6) group introduced into Sr(2)CaMoO(6):Eu(3+),Li(+) acts as an energy obstacle to prevent energy transfer among MoO(6) groups, leading to more energy being trapped by Eu(3+), and a higher photoluminescence intensity is obtained. The phosphor with optimized composition Sr(2)Ca(0.80)Li(0.10)Eu(0.10)Mo(0.10)W(0.90)O(6) shows a better luminescence intensity than the commercial phosphor Y(2)O(2)S:Eu under 395 nm excitations. (c) 2008 The Electrochemical Society.