Synthesis, characterization and optical properties of Y 3 Al 5 O 12 :Ce phosphor by mixed fuel combustion synthesis

Abstract YAG:Ce phosphors have been synthesized by single step combustion synthesis employing glycine-urea fuels at 500C. Crystal structures, luminescent properties of the phosphors are analyzed. XRD study of polycrystalline powder shows the formation of YAG phase at low temperature and crystallite size found in the range of 28 nm size. Photoluminescence emission spectra of YAG:Ce phosphor exhibited broad greenish yellow emission from Ce 3+ . The emission spectra of phosphors show gradual shift towards longer wavelength with the increase of doping concentration of Ce 3+ however results in significant decrease in the emission intensity. The critical distance of the energy transfer has been calculated by the concentration-quenching method. The energy transfer mechanism between Ce 3+ ions in YAG host has been studied in detail. The concentration-quenching mechanism can be explained by the electric dipole–dipole interaction of the Ce 3+ ions. Commission Internationale de l'Eclairage (CIE) co-ordinate of phosphor studied for and found suitable for wLEDs.