(12) United States Patent (10) Patent No.: US 6,361,885 B1 Chou (45) Date of Patent: Mar
USOO636.1885B1 (12) United States Patent (10) Patent No.: US 6,361,885 B1 Chou (45) Date of Patent: Mar. 26, 2002 (54) ORGANIC ELECTROLUMINESCENT Electrical Conduction and Low Voltage Blue Electrolumi MATERIALS AND DEVICE MADE FROM nescence in Vacuum-Deposited Organic Films, P.S. Vincett, SUCH MATERALS W. A. Barlow and R. A. Hann. G.G. Roberts, Source, date and page numbers not given. (75) Inventor: Homer Z. Chou, Schaumburg, IL (US) Organic electroluminescent diodes, C. W. Tang and S. A. Van Slyke, Research Laboratories, Corporate Research (73) Assignee: Organic Display Technology, Chicago, Group, Eastman Kodak Company, Rochester, New York IL (US) 14650, pp. 913–915, Sep. 21, 1987, Appl. Phys. Lett. 51(12). Molecular design of hole transport materials for obtaining (*) Notice: Subject to any disclaimer, the term of this high durability in organic electroluminescent diodes, Chi patent is extended or adjusted under 35 haya Adachi, Kazukiyo Nagai, and Nozomu Tamoto, U.S.C. 154(b) by 0 days. Chemical Products R&D Center, Rico Co., Ltd. pp. 2679–2681, May 15, 1995, Appl. Phys. Lett. 66(20). (21) Appl. No.: 09/196,672 Electroluminescence from trap-limited current transport in Vacuum deposited organic light emitting devices, P.E. Bur (22) Filed: Nov. 19, 1998 rows and S. R. Forest, Advanced Technology Center for Photonics and Optoelectronic Materials, Princeton Univer Related U.S. Application Data sity, pp. 2285-2287, Apr. 25, 1994, Appl. Phys. Lett. 64(17). (63) Continuation-in-part of application No. 09/172.843, filed on Multilayered organic electroluminescent device using a Oct. 15, 1998, and a continuation-in-part of application No.
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