Penetration phosphors for display devices

Details Penetration phosphors for display devices Penetration phosphors for display devices

1977-10-27

1978-08-08

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Screen

2523014S, H01J 2920, H01J 2928, H01J 3120

Patent

active

041059093

ABSTRACT:
La.sub.2 O.sub.2 S particles are employed as a carrier host in conjunction with terbium activator ions in a cathodo-luminescent penetration phosphor composition for cathode ray display tubes. A thin layer of La.sub.2 O.sub.2 SO.sub.4 :Tb or La.sub.2 O.sub.2 SO.sub.4 :Tb,Eu is utilized to provide a barrier which must be penetrated by excitation electrons to produce green spectral emission from the particle thereby increasing the voltage-turn-on characteristic of the phosphor. Additionally, methods are disclosed for synthesizing the same in addition to an improved method for synthesizing a penetration phosphor particle comprising a core of La.sub.2 O.sub.2 S:Tb and a barrier layer of La.sub.2 O.sub.2 S:Tb,Eu.

REFERENCES:
patent: 3939377 (1976-02-01), Ignasiak

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