NITRIDE-BASED FLUORESCENT MATERIAL, OXYNITRIDE-BASED FLUORESCENT MATERIAL AND LIGHT-EMITTING DEVICE

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PROBLEM TO BE SOLVED : To provide a red fluorescent material having a controllable particle size and good light-emitting properties and a light-emitting device produced by using the material. SOLUTION : The invention provides a nitride-based fluorescent material or an oxynitride-based fluorescent material doped with europium, emitting red light by absorbing near ultraviolet ray or blue light, expressed by general formula : CaxAlySizOaNb : Eu2+ (x, y, z, a and b satisfy the following formulas), further containing a rare earth metal fluoride or a rare earth metal chloride and having an average particle diameter of preferably ≥5 μm and ≤10 μm. 0.5≤x≤3, 0.5≤y≤3, 0.5≤z≤9, 0≤a≤3 and 0.5≤b≤3. COPYRIGHT : (C)2008, JPO&INPIT