Tailored photoluminescence of YAG:Ce phosphor through various methods

Trivalent cerium Ce3+ (Ce) activated yttrium aluminum garnet Y3Al5O12 (YAG) phosphor was synthesized by two methods: solid state reaction (SS), and combustion (CB) with urea, respectively. The crystallization and luminescent properties of the phosphors were studied. Factors influencing on the intensity of luminescence and the location of emission band of YAG:Ce, such as the type of flux used in SS, the reaction atmosphere, the concentration of activator, were investigated in detail. We accomplished red or blue shift of Cc emission band by a number of techniques in order to match with the variable emission wavelength of blue light emitting diodes. The change of emission in color coordinates was illustrated by chromaticity. Co-doping other rare earth ions with Ce3+ ions into YAG was attempted to increase the color rendering index. (C) 2003 Elsevier Ltd. All rights reserved.