Oxide Ceramic Fluorescent Material Having Rare Earth Diffused Therein

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PURPOSE : An oxide ceramic fluorescent material is suitable for manufacturing high output white LED illumination in comparison with conventional resin-coupled fluorescent material.CONSTITUTION : An oxide ceramic fluorescent material includes at least one polycrystalline ceramic sintered material selected from Y3Al5O12, Lu3Al5O12, (Y, Lu)3Al5O12, (Y, Gd)3Al5O12, and Al2O3 that at least one rare earth element selected from Ce, Eu, and Tb is diffused from the surface. The concentration of the rare earth element is 1 wt% at a depth of 50-600 micron from the surface of the sintered material and the concentration of the rare earth element at anywhere near the surface of the sintered material is at least 1 wt%.[Reference numerals] (AA) Surface white part P1; (BB) Gray part P2COPYRIGHT KIPO 2013