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Synthesis, Phase Formation between Solid Solutions and Photoluminescence Studies on Rare Earth Doped - Glaserite Type Orthovanadate Ca9Y(1-x)-yEux[VO4]7 : Lay

  • David, A. Duke John
  • Muhammad, G. Shakil
  • Sivakumar, V.
A new type of orthovanadate Ca9Y(1-x)-yEux[VO4]7 : Lay (x = 0.05 and y = 0 to 1 insteps of 0.2) phosphor was synthesized via the conventional high temperature solid state reaction method. The phase purity and phase transition were studied systematically by Powder X-ray diffraction (PXRD). The PXRD pattern reveals that the synthesized phosphors have a unique crystal structure, which is a rhombhohedral crystal with a slight different lattice paramaters between the two solid solutions. The morphology and elemental analysis of the synthesized compounds was measured by FESEM with EDAX. The diffuse reflectance spectra were measured for all the compositions and the corresponding band gap was calculated. The photoluminescence (PL) study shows a dominant electric dipole and a weak magnetic dipole transitions were observed. The efficient energy transfer from host [VO4] to Eu3+ is confirmed by the PL life time studies. The chromaticity colour coordinate value for this phosphor material is calculated by using emission data and the obtained CIE color coordinate values are very much closer to the NTSC standard values for red colour. This phosphor material can find potential application as a red phosphor for white light emitting diodes.
Select Volume / Issue:
Year:
2015
Type of Publication:
Article
Keywords:
A Phase Formation; B Solid Solutions; C Phosphor Material; D White LEDs
Journal:
IJASM
Volume:
2
Number:
4
Pages:
110-116
Month:
July
Hits: 1268

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