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:
Jul. 21, 2009
Filed:
Jul. 28, 2005
William J. Begley, Webster, NY (US);
Tukaram K. Hatwar, Penfield, NY (US);
Natasha Andrievsky, Webster, NY (US);
William J. Begley, Webster, NY (US);
Tukaram K. Hatwar, Penfield, NY (US);
Natasha Andrievsky, Webster, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An OLED device comprises a cathode, an electron-transporting layer (ETL), a light-emitting layer (LEL) containing a fluorescent light-emitting material, a hole-transporting layer (HTL), and an anode, in that order, wherein the ETL comprises a mixture of compounds, including a first compound and at least one second compound, and wherein there is present a hole blocking layer (HBL) adjacent to the LEL on the cathode side. It provides a reduced drive voltage with comparable color hue. The first compound is present in an amount of 50% to 90% by volume and is represented by Formula (2): Wherein Rand Rrepresent the substituent and neither are hydrogen; Rand Rrepresent hydrogen; Arand Arrepresent the same aromatic group; and Arand Arrepresent the same aromatic group.