Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2006-03-30
2009-12-29
Garrett, Dawn (Department: 1794)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S917000, C313S504000, C313S506000
Reexamination Certificate
active
07638207
ABSTRACT:
An improved OLED structure that enhances both stability and luminance efficiency, includes a substrate; an anode and a cathode; a light-emitting layer disposed between the anode and cathode; and a hole-transporting structure disposed between the light-emitting layer and the anode including two or more sublayers; a first sublayer in contact with the light-emitting layer and including a first hole-transporting material and a first stabilizing dopant, and a second sublayer including a second hole-transporting material and a second stabilizing dopant, and a third dopant having a bandgap that is smaller than each of the bandgaps of the second hole-transporting material and the second stabilizing dopant, respectively.
REFERENCES:
patent: 4769292 (1988-09-01), Tang et al.
patent: 5853905 (1998-12-01), So et al.
patent: 5989737 (1999-11-01), Xie et al.
patent: 6387546 (2002-05-01), Hamada et al.
patent: 6565996 (2003-05-01), Hatwar et al.
patent: 6692846 (2004-02-01), Hatwar et al.
“Organic Electroluminescent Diodes” by Tang et al.; Appl. Phys. Lett. 51 (12), Sep. 21, 1987; pp. 913-915.
“Electroluminescence in Organic Films with Three-Layer Structure” by Adachi et al.; JP Journal of Applied Physics; vol. 27, No. 2; Feb. 1988, pp. L269-L271.
“Electroluminescence of Doped Organic Thin Films” by Tang et al.; J. Appl. Phys. 65(9), May 1, 1989; pp. 3610-3616.
“Improving the Efficiency and Stability of Organic Light Emitting Devices by Using Mixed Emitting Layers” by Popovic et al.; Jul. 1998; SPIE vol. 3476, pp. 68-72.
Hatwar Tukaram K.
Spindler Jeffrey P.
Eastman Kodak Company
Garrett Dawn
Owens Raymond L.
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