| 摘要 |
PROBLEM TO BE SOLVED: To obtain a blue-light-emitting phosphor having excellent discoloration resistance and improved application properties by multiply coating the surface of a phosphor having ZnS as the matrix with silicon dioxide of types having different particle diameters. SOLUTION: The surface of a phosphor having ZnS as the matrix is coated with 0.01-0.5wt.%, based on the phosphor, silicon dioxide having a mean particle diameter of 10μm or below and then coated with 0.05-1.0wt.%, based on the phosphor, silicon dioxide having a mean particle diameter of 10μm or above to obtain a blue-light-emitting phosphor. The binder used to adhere the silicon dioxide particles to the phosphor is at least one member selected from among zinc compounds, aluminum compounds and alkaline earth metal compounds.
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