The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 2002
Filed:
Sep. 30, 1998
Robert C. Haddon, Lexington, KY (US);
Agere Systems Guardian Corp., Orlando, FL (US);
Abstract
An improved multilayer light emitting device includes novel compounds for use as the electron transporting layer. In particular, the novel compounds are novel aluminum cheltates (e.g. tris(9-oxidophenalenone) aluminum [Al(9-opo) ] and tris(6-oxidobenzanthrone) aluminum [Al(6-obao) ]. These compounds are electron acceptors having improved thermal stability while in most cases and in most applications maintaining comparable efficiencies. When negatively biased, electrons are infected into the electron transporting layer. The concurrent positive bias on the anode in relation to the cathode causes holes to be injected from the cathode into the hole transporting layer. Electroluminescence is produced and confined generally near the interface between these electron and hole transporting layers an a result of the recombination of the electron and hole pairs.