| 摘要 |
PURPOSE:To obtain a blue light-emitting phosphor with prolonged after-grow for a color display tube with excellent luminance, by baking oxides of Sr, Ca, Mn and Sb, etc. with addition of a sulfate of K, Rb, Na or Cs as a flux. CONSTITUTION:Oxides of Sr, Ca, Mn and Sb, or compounds forming these oxides by heating are well mixed and then fired at about 1,100 deg.C. The fired product is crushed and then fired again at about 1,200 deg.C in O2 with addition of at least one comp. selected from among K2SO4, Rb2SO4, Na2SO4 and Cs2SO4 as a flux, to obtain a blue light-emitting phosphor of the formula (wherein 0<=x<=0.99; 0.01<=y<=0.25).
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