Abstract
A novel red-emitting phosphor LixCa1−2xEuxSiyMo1−yO4 (0.22⩽x⩽0.32, 0⩽y⩽0.08) was synthesized by solid state reaction at 750°C. The phosphors were characterized by X-ray powder diffraction (XRD) and photoluminescence spectra. The LixCa1−2xEuxSiyMo1−yO4 phosphors can be efficiently excited by 395nm near ultraviolet and 465nm blue light. The emission spectra exhibit intense red emission with the main emission peak at 617nm and the chromaticity coordinates locate in the range of x=0.667–0.668, y=0.331–0.332 approaching the National Television System Committee (NTSC) standard values (x=0.67, y=0.33). The photoluminescence spectra showed that simultaneously co-doping Li+ and Si4+ ions in Eu3+-activated CaMoO4 system enhanced luminescence intensity compared with that of CaMoO4:Eu3+.
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