Patent ID: 7713443

Claim:
A production method of a phosphor comprising: mixing raw material powders of silicon nitride, M element-containing inorganic substance having oxide of M element, and A element-containing inorganic substance as starting materials (wherein the M Element is one or more elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb; the A Element is one or more elements selected from the group consisting of Mg, Ca, Sr, and Ba; the oxide of M element is on M 2 O 3 basis; and the A element-containing inorganic substance is on AO basis) in a mixing ratio represented by fSi 3 N 4 -gM 2 O 3 -hAO, in which f+g+h= 1 0.00001≦g≦0.03 (6) 0.4≦h≦0.8 (7) are satisfied, so as to obtain a raw material mixture; and baking the raw material mixture at a baking temperature in a range of 1200° C. to 2200° C. in a nitrogen atmosphere so as to produce the phosphor as an inorganic composition containing the at least M Element, A Element, silicon, oxygen, and nitrogen, and including at least an inorganic crystal having the same crystal structure as that of A 2 Si 5 N 8 and an A element-containing crystal which is silicate containing A, Si, and O other than the inorganic crystal having the same crystal structure as that of A 2 Si 5 N 8 .