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:
May. 07, 2002
Filed:
Nov. 20, 1998
Richard Henry Friend, Cambridge, GB;
Karl Pichler, Hopewell Junction, NY (US);
David John Lacey, Ashwell, GB;
Abstract
An electroluminescent device comprising: a first charge-carrier injecting layer for injecting positive charge-carriers; a second charge-carrier injecting layer for injecting negative charge-carriers; a layer of a first organic material located between the charge-carrier injecting layers; and located between the layer of a first organic material and one of the charge-carrier injecting layers: a first light-emissive region comprising a light-emissive second organic material having an energy-gap less than that of the first organic material; and a second light-emissive region comprising a first component of a light-emissive third organic material having an energy-gap greater than that of the first organic material, and a second component having at least one energy level off-set from that of the first component; such that when charge-carriers are injected in the first region by the charge-carrier injecting layers light is emitted principally from the second organic material and when charge-carriers are injected in the second region by the charge-carrier injecting layers light is emitted principally from the third organic material.