| 摘要 |
PROBLEM TO BE SOLVED: To provide a phosphor having a capability of emitting light even at a low voltage and contg. as the matrix SrTiO3 having good life span properties. SOLUTION: There is prepd. an SrTiO3 : Pr, Al phosphor activated with 0.0025mol/mol of Pr and admixed with 0.2mol/mol of Al. The phosphor is coated with Pt chloride dissolved in a predetermined amt. of ethanol, and fired at a temp. of 400 to 700 deg.C to convent the substance coating the phosphor into an oxide, PtO2-x (wherein 0<=x<2). The amt. of coat was varied in the range of 10 to 80,000μg/g. A vacuum fluorescence display having the phosphor mounted on the anode thereof was produced to evaluate the light emission thereof at an anode voltage of 400V and at an anode current of 75mA/cm<2> . STD stands for the phosphor not subjected to surface treatment. The residual luminamnce rate, which indicates the life span, is increased as the amt. of coat is increased. The residual luminance rate of STD with no coat is 20% in terms of relative value. A phosphor wherein the amt. of coat is about 500μg/g shows a relative illuminance of at least 70%, which is more than 3 times as much as that of STD. The amt. of coat is most pref. in the range of 800 to 2,000μg/g.
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