Method for producing M-c-n-o phosphor

It reduces uneven light emission, provides a method for producing the M-C-N-O based phosphor improved color purity. Group IIIB element (M), a carbon (C), nitrogen (N) and oxygen (O) M-C-N-O based phosphor manufacturing method consisting, group IIIB element-containing compound and the nitrogen-containing organic compounds step of producing a heated thermal decomposition product mixture comprising the step of crushing the product containing the resulting pyrolysis products, and manufacturing method comprising the step of firing the resultant pulverized product.