Oxygen substituted barium thioaluminate phosphor materials

Stock material or miscellaneous articles – Composite – Of inorganic material

Reexamination Certificate

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C428S917000, C313S503000, C313S509000, C252S30140H

Reexamination Certificate

active

07112373

ABSTRACT:
A thin film phosphor for an electroluminescent device, the phosphor being selected from the group consisting of thioaluminates, thiogallates and thioindates having at least one cation selected from elements of Groups IIA and IIB of the Periodic Table of Elements. The phosphor being activated by a rare earth metal and containing oxygen as a partial substitute for a portion of the sulphur in the crystal lattice of the thiogallate, thioindate or thioaluminate. The phosphor is a single phase homogeneous compound and provides improved luminance stability. An electroluminescent device comprising the thin film phosphor is also described and methods of making the phosphor of the invention.

REFERENCES:
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Youji Inque, et al., Atomic Composition and Structural Preperties of Blue Emitting BaAl2S4:Eu Electroluminescent Thin Films,Jpn. J. Appl Phys, vol. 40 (2001), pp. 2451-2455, Japan Society of Applied Physics, 2001.
Y. Izumi et al., “An X-ray Photoelectron Spectroscopy Study of Elements Chemical States in SrGa2S4:CE Blue Electroluminescent Thin Films,” Jpn. J. Appl. Phys. vol. 38 (1999) pp. 4798-4801, Aug. 1999.

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