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  Journal of Spectroscopy and Dynamics 2013, 3: 10
  Research Article
Crystal structure and luminescence properties of novel red - emitting Ca10-1.5xEuxLi(VO4)7 phosphors
  Lihong Liua,b, Rong-Jun Xieb, Naoto Hirosakib, Yuanqiang Lic  
a Structural and Functional Integration of Ceramics Group, the Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, China
b Sialon Group, Sialon Unit, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
c Dow Electronic Materials, The Dow Chemical Company, 201 Washington Road, Princeton, NJ 08540, United States

  A novel vanadate-compound Ca10Li(VO4)7 was synthesized by using solid-state reaction. Phase purity and crystal structure of Ca10Li(VO4)7 were determined by X-ray powder diffractions and the Rietveld refinement analysis (R3c, Z = 6, a = 10.8223(1) nm, c = 38.0451(7) nm). By doping with Eu3+, Ca10-1.5xEuxLi(VO4)7 phosphors showed the most intense emission at 613 nm under 465 nm excitation, and their emission intensities were greatly affected by firing temperature and Eu3+ concentration. Furthermore, at 150 °C, the emission intensity maintained about 77% of that measured at room temperature. These experimental results indicate that this kind of red-emitting Ca10-1.5xEuxLi(VO4)7 phosphors may be potentially applied in white light-emitting diodes (LEDs).
  White LEDs; Red-emitting; Vanadate; Luminescence; Phosphor  

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