OXIDE CERAMIC FLUORESCENT MATERIAL HAVING RARE EARTH ELEMENT DIFFUSED THEREIN

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PROBLEM TO BE SOLVED : To provide an oxide ceramic fluorescent material having a rare earth element diffused therein which is obtained by diffusing a rare earth element as an activating agent from the surface of a transparent ceramic sintered product, has desired characteristics, and is thin and uniform. SOLUTION : An oxide ceramic fluorescent material having a rare earth element diffused therein is characterized in that at least one rare earth element selected from Ce, Eu and Tb as a fluorescent light-activating agent is diffused from the surface of at least one polycrystalline ceramic sintered product selected from Y3Al5O12, Lu3Al5O12, (Y, Lu)3Al5O12, (Y, Gd)3Al5O12, Al2O3; the concentration of the rare earth element at any place between a depth position of ≥50 μm and a depth position of 600 μm from the surface of the polycrystalline ceramic sintered product is 1 mass%; the concentration of the rare earth element on the surface side of the polycrystalline ceramic sintered product from the position is ≥1 mass%. The fluorescent light material comprises the oxide ceramic sintered product, and is suitable for high output pseudo white LED illumination at the point of heat resistance in comparison with conventional resin fluorescent light materials. COPYRIGHT : (C)2014, JPO&INPIT