Electroluminescent device containing blue light emitting materia

Details Electroluminescent device containing blue light emitting materia Electroluminescent device containing blue light emitting materia

1997-06-26

1999-09-21

Nold, Charles

Stock material or miscellaneous articles

Composite

Of inorganic material

428917, 313503, 25230165, 25230145, H05B 3300

Patent

active

059552107

ABSTRACT:
In an EL device in which a blue light emitting material obtained by doping Ce as a luminescent center into Ca.sub.X S.sub.Y host material is used for a luminescent layer, values of X and Y in the CaGa.sub.X S.sub.Y host material are set in ranges of 1.4.ltoreq.X.ltoreq.1.9, 2.9.ltoreq.Y.ltoreq.3.8. The blue light emitting material thus obtained has a new structure defined by the fact that an X-ray diffraction spectrum obtained by using Cu K.alpha. radiation as a X-ray source has at least one peak in diffraction angles of 13.5.+-.0.2 degrees, 14.6.+-.0.2 degrees and 25.7.+-.0.2 degrees. The blue light emitting EL device has a luminance higher than that of a conventional EL device.

REFERENCES:
patent: 5309070 (1994-05-01), Sun et al.
Patent Abstracts of Japan, 09007769, Oct. 1997, Hattori.
Patent Abstracts of Japan, 002061410, May 1996, Derwent.
D.C. Smith, et al. "Late-News Paper: Crystalline--As-Deposited CaGa.sub.2 S.sub.4 :Ce Via Low-Temperature Metal-Organic Chemical Vapor Deposition", SID 95 Digest, 1995, pp. 728-731.

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