Oxonitridosilicate phosphors with compositions of Y 1-xCexSiO2N （x=0-0. 1） were synthesized by a new synthetic route based on a solid state reaction among YSi, CeSi, SiO2 and Y203 compounds at high temperature and high pressure. The photohtminescence properties dependent on Ce concentration and temperature were investigated. Concentration quenching occurred when the doped Ce3＋ concentration was more than 3 tool.%. The emission spectra showed red shifts from 430 to 447 nm with the increased Ce concentration from 0.5 mol.% to 10 mol.%. The quenching temperature was estimated as ~380 K. The chromaticity coordinates of the excitation and emission spectra were stable against the temperature. This study showed these YSiO2N：Ce3＋ phosphors the potential applications in the three-RGB phosphor-converted white LEDs.
A series of novel Sm3＋-doped LiY（MoO4）2 red phosphors under the UV excitation were synthesized by solid state reaction at 800 ℃ for 7 h. The data measured by X-ray diffraction （XRD） indicated that the samples were all pure phases of LiY（MoO4）2. Their excitation spectra had a broad band ranging from 250 to 350 nm and several sharp peaks. The centers of the peaks were located at about 365 nm （6H5/2→4D3/2）, 378 nm （6H5/2→rp7/2）, 406 nm （6H5/2→4FT/2）, 420 nm （6H5/2→6ps/2）, 442 nm （6H5/2→4Gg/2）, 471 nm （6H5/2→4I13/2） and 482 nm （6H5/2→419/2）, respectively. The strongest emission was excited by 406 nm, and the main emissions were located at 568 nm （4G5/2→6Hs/2）, 610 nm （4Gs/2→rH7/2）, 649 nm （4G5/2→6H9/2） and 710 nm （4Gs/2→6HII/2）. Photoluminescence prop- erties were determined for various concentrations of Sm3＋-doped LiY（MoO4）2 host, and the luminescence intensity had the best value when x=0.02 in LiYix（MoO4）2：xSm3＋.
