| abstract |
The present invention provides a method for producing a crystalline material having high emission intensity and having a broad excitation spectrum suitable for a white LED. In the present invention, a raw material mixture containing M 1 , M 2 , M 3 , and L is calcined one or more times to obtain the formula: M 1 2a (M 2 b L c ) M 3 d O y N A method for producing a crystalline substance represented by x , wherein at least one firing is performed in an atmosphere containing NH 3 gas. M 1 is at least one selected from alkali metals, M 2 is at least one selected from Ca, Sr and Ba, M 3 is at least one selected from Si and Ge, L is a rare earth element, Bi and Mn At least one selected from: a is 0.9 or more and 1.5 or less, b is 0.8 or more and 1.2 or less, c is 0.005 or more and 0.2 or less, d is 0.8 or more, 1.2 or less, x is 0.001 or more and 1.0 or less, and y is 3.0 or more and 4.0 or less. [Selection figure] None |