摘要 |
<p>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/m2. wherein R′ is independently in each occurrence H, C1-C20 hydrocarbyl or C1-C20 hydrocarbyl containing one or more S, N, O, P or Si atoms, C4-C16 hydrocarbyl carbonyloxy, C4-C16 aryl(trialkylsiloxy) or both R′ may form together with the 9-carbon on the fluorene ring a C5-C20 cycloaliphatic structure containing one or more heteroatoms of S, N or O.</p> |