YAG yellow luminescence comprising lithium for white LED and manufacturing method thereof

摘要

PURPOSE: Provided are a yellow phosphor of yttrium aluminate which has excellent luminance under excited state of blue light source generated from blue emitting diode, and which is suitable for white light emitting diode, and a method for producing the same. CONSTITUTION: The yellow phosphor of yttrium aluminate is represented by formula: (Y1-a-bCeaLib)3Al5O12(wherein 0.005=a=0.02, 0.01=b=0.025). The method comprises the steps of (i) adding cerium oxide(CeO2) and lithium carbonate(Li2CO3) to yttrium aluminate which is a matrix, so that 0.005=a=0.02, 0.01=b=0.025 in the formula; (ii) drying the mixture and precalcining the dried mixture in atmosphere at 1,200 deg.C; (iii) cooling the precalcined product, and heat treating the cooled product at temperature of 1650 deg.C or more; and (iv) milling the treated product.