BLUE LIGHT-EMITTING COMPOSITION AND FLUORESCENT DISPLAY TUBE EXCITED BY LOW ENERGY ELECTRON RAY

摘要

PURPOSE:To prepare the titled composition capable of giving a highly luminous fluorescent film and keeping the high luminance even after the baking in the screen printing process, by mixing a self-activated zinc sulfide fluorescent material and an electrically conductive material such as electrically conductive metallic oxide, etc. at a specific ratio. CONSTITUTION:The objective composition is prepared by mixing (A) a self- activated zinc sulfide fluorescent material[ZnS:(Zn)]with an electrically conductive material selected from electrically conductive metallic oxides (preferably indium oxide, tin oxide or zinc oxide) and electrically conductive metallic sulfides at a weight ratio of 99:1-1:99. A fluorescent display tube excitable with low energy electron ray can be manufactured by sealing an anodic plate having a fluorescent film made of the above light-emitting composition and a cathode placed opposite to the fluorescent film, in an evacuated vessel.