METHOD FOR PRODUCING CRYSTALLINE SUBSTANCE

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PROBLEM TO BE SOLVED : To provide a method for producing a crystalline substance exhibiting high emission intensity and having wide excitation spectrum suitable for white LED. SOLUTION : The method for producing a crystalline substance is expressed by M12a(M2bLc)M3dOyNx by firing a raw material mixture containing M1, M2, M3 and L once or more times, where at least once of firing is carried out in an atmosphere containing NH3 gas, provided that M1 is at least one selected from alkali metals; M2 is at least one selected from Ca, Sr and Ba; M3 is at least one selected from Si and Ge; L is at least one selected from a rare earth element, Bi and Mn; a is 0.9-1.5; b is 0.8-1.2; c is 0.005-0.2; d is 0.8-1.2; x is 0.001-1.0; and y is 3.0-4.0. COPYRIGHT : (C)2012, JPO&INPIT