Penetration phosphors for display devices

Details Penetration phosphors for display devices Penetration phosphors for display devices

1976-03-22

1978-01-31

Kendall, Ralph S.

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

427 68, 2523014R, 2523014S, 428403, C09K 1114, C09K 1146

Patent

active

040716406

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: 3560783 (1971-02-01), Shortes
patent: 3767459 (1973-10-01), Kingsley et al.
patent: 3791844 (1974-02-01), Tecotzky et al.
patent: 3939377 (1976-02-01), Ignasiak

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