Display tube with terbium-activated blue-luminescing phosphor sc

Details Display tube with terbium-activated blue-luminescing phosphor sc Display tube with terbium-activated blue-luminescing phosphor sc

1984-11-01

1986-08-05

Willis, Davis L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313468, 313474, 358253, 2523014S, 2523014H, H01J 3100, H01J 2910, C09K 1108

Patent

active

046045503

ABSTRACT:
A display tube comprising in an evacuated envelope means to generate at least one electron beam which is focused on a display screen and describes a field thereon, which display screen comprises a terbium-activated blue-luminescing phosphor on a carrier, and in which the light emitted by the phosphor falls through a filter. If the energy of the emissions of the phosphor which find their origin in the .sup.5 D.sub.3 -level of terbium is at least 40% of the energy of the emissions of all terbium levels and the filter has a transmission of more than 75% at those wavelengths where the .sup.5 D.sub.3 .fwdarw..sup.7 F.sub.5 and the .sup.5 D.sub.3 .fwdarw..sup.7 F.sub.4 emissions of terbium are located and the filter has a transmission of less than 10% at those wavelengths where the .sup.5 D.sub.4 .fwdarw..sup.7 F.sub.5 and the .sup.5 D.sub.4 .fwdarw..sup.7 F.sub.4 and the .sup.5 D.sub.4 .fwdarw..sup.7 F.sub.3 emissions of terbium are located so that the color point of the filtered light is located in the range x.ltoreq. 0.200 and y.ltoreq.0.100 in the CIE color triangle, a well saturated blue picture is displayed having a satisfactorily high energy efficiency.

REFERENCES:
patent: 3760215 (1973-09-01), Sach
patent: 3946267 (1976-03-01), Lustig et al.
patent: 4177399 (1979-12-01), Muccigrosso et al.
patent: 4275333 (1981-06-01), Kagami et al.
patent: 4307320 (1981-12-01), Kotera et al.

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