| 摘要 |
PROBLEM TO BE SOLVED: To obtain a pink phosphor excellent in luminance and excellent in hue retention and capable of emitting a light of a pink color with a sharp hue by mixing a ZnS:Zn or ZnS:Ag phosphor with a (Zn-Cd)S:Ag, Cl phosphor. SOLUTION: A ZnS:Zn or ZnS:Ag phosphor as a blue-emitting phosphor is mixed with a (ZnxCd1-x)S:Ag, Cl phosphor (wherein x=0.1-0.5) as a red- emitting phosphor in a weight ratio of 20:80 to 80:20 to obtain a pink-emitting phosphor which emits visible light at a relatively low drive voltage and suffers no luminance saturation. The pink phosphor shows x of 0.3-0.55 and y of 0.20-0.40 on the CIE color coordinates. When a metal is further added to the pin phosphor, it is effective to improve the luminance of the phosphor. Desirably, the metal added is a Zn powder having a diameter of 0.1-10μm and a purity of at least 95% and it is used in an amount of 0.1-5.0 wt.% based on the weight of the phosphor. By the addition of the metal, the luminance of the phosphor is improved.
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