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  Physics Express 2013, 3: 24
  Research Article
Synthesis and characterization of yellow light emitting Na5Dy(MoO4)4 double molybdate phosphor
  S. Dutta, S. Som, R. K. Mukherjee, S. K. Sharma  
Department of Applied Physics, Indian School of Mines, Dhanbad-826004, India
  Na5Dy(MoO4)4 double molybdate phosphor was synthesized by solid state reaction method. Characterization of the prepared phosphor was carried out by X-ray diffraction, photoluminescence, absorption, diffuse reflectance, thermoluminescence and dielectric studies. X-ray diffraction studies confirm the tetragonal structure with average crystallite size of 60 nm. Photoluminescence spectrum shows intense emission peak at 579 nm corresponding to the transition 4F9/26H13/2 for bright yellow light. Thermoluminescence measurements show a broad glow curve with maximum centered at 107ºC after irradiating the phosphor by γ-rays. The dielectric properties such as permittivity, dielectric loss and a.c. conductivity were studied as a function of frequency. The structural, colour coordinates, band gap and trapping parameters were calculated from X-ray diffraction and optical studies.
  XRD; Photoluminescence; Band gap; Thermoluminescence  

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