Patent ID: 8366965

Claim:
A method for producing a blue phosphor represented by a general formula aBaO.bSrO.(1−a−b)EuO.cMgO.dAlO 3/2 .eWO 3 , where 0.70≦a≦0.95, 0≦b≦0.15, 0.95≦c≦1.15, 9.00≦d≦11.00, 0.001≦e≦0.100, and a+b≦0.97 are satisfied, comprising: a step of mixing source materials of the phosphor according to a composition of the general formula; and a step of firing the mixture of the source materials in a mixed gas comprising hydrogen, nitrogen, and oxygen at temperature in a range of 900 to 1600° C. for 1 to 50 hours.