Patent ID: 7897064

Claim:
A method for the production of the oxynitride-based fluorescent material formed by substitution of Eu for part of M in a composition of MOSi 2 N 2 O, wherein M denotes one or more elements selected from among Be, Mg, Ca, Sr and Ba, comprising the steps of: mixing oxides of Be, Mg, Ca, Sr, Ba and Eu or compounds of Be, Mg, Ca, Sr, Ba and Eu capable of forming said oxides on exposure to heat, silicon oxide or a compound capable of forming silicon oxide on exposure to heat, and silicon nitride or a compound capable of forming silicon nitride on exposure to heat to obtain a mixture; and firing the mixture in a presence of carbon or a carbon-containing compound in a vacuum or in a non-oxidizable atmosphere at a temperature in a range of 1200 to 1900° C.