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:
Feb. 28, 2012
Filed:
Nov. 09, 2006
Salvatore Cina, Grenoble, FR;
Salvatore Cina, Grenoble, FR;
Cambridge Display Technology Limited, Cambridgeshire, GB;
Abstract
A polymer blend comprising a first, light-emissive polymer comprising substituted or non-substituted units according to formulae (I) and (II) and a second, hole transport polymer comprising substituted or non-substituted fluorene units according to formula (I) and substituted or non-substituted triarylamine units, wherein the molecular weights of the first and second polymers and the blending ratio of the first and second polymers are selected such that, in use in a light-emissive device, the luminance of the emitted light at a bias of 5V is no less than 20,000 cd/m. wherein R' is independently in each occurrence H, C-Chydrocarbyl or C-Chydrocarbyl containing one or more S, N, O, P or Si atoms, C-Chydrocarbyl carbonyloxy, C-Caryl(trialkylsiloxy) or both R′ may form together with the 9-carbon on the fluorene ring a C-Ccycloaliphatic structure containing one or more heteroatoms of S, N or O.