A method for producing a blue phosphor, comprising firing a mixture for 2 to 24 hours at a temperature of 800.degree. C. or higher in an atmosphere of hydrogen sulfide, carbon disulfide, or an inert gas, the mixture containing a barium compound component, a silicon compound component, and a cerium compound component in quantitative proportions such that the atomic ratios of the components fulfill the equations 0.50

 
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