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:
Oct. 06, 2009
Filed:
Dec. 17, 2004
Marina E. Kondakova, Kendall, NY (US);
Joseph C. Deaton, Rochester, NY (US);
Christopher T. Brown, Rochester, NY (US);
Kevin P. Klubek, West Henrietta, NY (US);
Shouquan Huo, Webster, NY (US);
Marina E. Kondakova, Kendall, NY (US);
Joseph C. Deaton, Rochester, NY (US);
Christopher T. Brown, Rochester, NY (US);
Kevin P. Klubek, West Henrietta, NY (US);
Shouquan Huo, Webster, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An electroluminescent device comprises a cathode and an anode; and, located therebetween, a light-emitting layer (LEL) comprising at least one hole transporting co-host and at least one electron transporting co-host, together with at least one phosphorescent emitter, and wherein the triplet energy of each of the co-host materials is greater than the triplet energy of the phosphorescent emitter, and further containing an exciton blocking layer comprising a hole transporting material with triplet energy greater or equal to 2.5 eV adjacent the emitting layer on the anode side. The invention provides devices that emit light with high luminous efficiency at low voltage.