Patent ID: 8124248
Filing Date: 2012-02-28
Classification: C09K,H01L,Y10S

Abstract:
1. 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 consisting of alternating single repeat units (a) and (b), said single repeat unit (a) comprising a substituted or non-substituted fluorene unit according to formula (I) and said single repeat unit (b) comprising a substituted or non-substituted triarylamine unit, 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 2 wherein R′ is independently in each occurrence H, C