The novel red phosphors NaLu1-xEux(WO4)2(x=0.1,0.2,0.4,0.6,0.8,1.0)were synthesized via the combustion method.The X-ray powder diffraction patterns show that these phosphors have the same single phase with the scheeli...The novel red phosphors NaLu1-xEux(WO4)2(x=0.1,0.2,0.4,0.6,0.8,1.0)were synthesized via the combustion method.The X-ray powder diffraction patterns show that these phosphors have the same single phase with the scheelite structure.The photoluminescence spectra results indicate that the excitation spectra of the samples consist of a broad absorption band of 200-350 nm and some sharp lines around 350-500 nm which corresponds to the f-f transitions within 4fs configuration of Eu3+.The emission spectra consist of the orange region 5D0---~7F1(594 nm)and the red region 5D0→7F2(618 nm).Among these phosphors,NaEu(WO4)2 synthesized at 900℃exhibits the strongest red emission under 395 nm excitation and appropriate CIE chromaticity coordinates(x=0.637,y=0.359)close to the NTSC standard value.展开更多
基金This work was supported by National Natural Science Foundation of China(No.51002069).
文摘The novel red phosphors NaLu1-xEux(WO4)2(x=0.1,0.2,0.4,0.6,0.8,1.0)were synthesized via the combustion method.The X-ray powder diffraction patterns show that these phosphors have the same single phase with the scheelite structure.The photoluminescence spectra results indicate that the excitation spectra of the samples consist of a broad absorption band of 200-350 nm and some sharp lines around 350-500 nm which corresponds to the f-f transitions within 4fs configuration of Eu3+.The emission spectra consist of the orange region 5D0---~7F1(594 nm)and the red region 5D0→7F2(618 nm).Among these phosphors,NaEu(WO4)2 synthesized at 900℃exhibits the strongest red emission under 395 nm excitation and appropriate CIE chromaticity coordinates(x=0.637,y=0.359)close to the NTSC standard value.
