GREEN-EMITTING PHOSPHOR COMPOSITION AND CATHODE RAY TUBE PROVIDED WITH FLUORESCENT FILM PRODUCED THEREFROM

PROBLEM TO BE SOLVED: To obtain a phosphor composition having good luminance characteristics, after-glow characteristics, and deterioration resistance even in a high-current drive and giving a fluorescent film desirable for cathode ray tubes by mixing a Y2SiO5:Tb phosphor with an SrGa2S4:Eu phosphor...

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Bibliographic Details
Main Authors YUN WON-HO, JEONG JWA-YOUNG, KYO KYOSAI
Format Patent
LanguageEnglish
Published 21.11.2000
Edition7
Subjects
ADHESIVES
BASIC ELECTRIC ELEMENTS
CHEMISTRY
DYES
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
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Summary:PROBLEM TO BE SOLVED: To obtain a phosphor composition having good luminance characteristics, after-glow characteristics, and deterioration resistance even in a high-current drive and giving a fluorescent film desirable for cathode ray tubes by mixing a Y2SiO5:Tb phosphor with an SrGa2S4:Eu phosphor in a specified ratio. SOLUTION: This composition comprises 75-95 mass % Y2SiO5:Tb phosphor and 5-25 mass % SrGa2S4:Eu. This composition is thoroughly mixed with a 0.1% K2SiO3 solution to prepare a dispersion. This dispersion is added to a Ba(NO3)2 solution, and the resultant solution is placed on a glass panel and is subjected to a precipitation treatment to form a fluorescent film on the panel. The thus formed fluorescent film is processed to obtain a cathode ray tube. The SrGaS4:Eu phosphor is obtained by mixing 0.1-1.5 mol of a strontium salt with 1.5-2.5 mol of gallium salt, and 0.001-0.05 mol of europium oxide, adding a suitable amount of a solvent to the mixture, firing the resultant mixture at 700-900 deg.C in a hydrogen sulfide gas atmosphere, and subsequently carrying out washing with water, drying, and screening.
Bibliography:Application Number: JP20000114317