| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluorescent display tube having a high luminance, a long lifetime and the capability of emitting a yellow light without causing any environmental problems by using a mixture of a (Zn, Mg)O:Zn phosphor with a conductive metal oxide as the material for forming the yellow-light- emitting phosphor layer. SOLUTION: A fluorescent display tube which performs display by utilizing the luminance of the phosphor layer by excitation with slow electron beams, wherein the phosphor layer is made of a mixture of a (Zn, Mg)O: Zn phosphor with a conductive metal oxide, is provided. When In2 O3 is used as the conductive metal oxide, it should have a median diameter of 10μm and is used in an amount of 0.01-20wt.% based on the phosphor. When a mixture of In2 O3 with WO3 is used as the conductive metal oxide, the mixture is used in an amount of 0.02-20wt.% based on the phosphor, and the In2 O3 is used in an amount to give an In2 O3 /Cn2 O3 +WO3 ) ratio of 0.01-1. Further, the surface of the phosphor is desirably coated with a silicone compound in a coating amount of 2,000ppm or below.
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