Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2006-05-11
2009-10-06
Garrett, Dawn (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S917000, C313S503000, C313S509000, C252S30140R
Reexamination Certificate
active
07597969
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.
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Y. lzumi 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.
Y. Inoue et al., “Atomic Composition and Structural Properties of Blue Emitting BaAl2S4:Eu Electroluminescent Thin Films,” Jpn. J. Appl. Phys. vol. 40 (2001) pp. 2451-2455, Apr. 2001.
Hamada Hiroki
Moore John Wesley
Pugliese Vincent Joseph Alfred
Stiles James Alexander Robert
Yoshida Isao
Fay Sharpe LLP
Garrett Dawn
Ifire IP Corporation
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