Synthesis and device characterisation of side-chain polymer electron transport materials for organic semiconductor applications
作者:Stuart Dailey、W. James Feast、Richard J. Peace、Ian C. Sage、Stephen Till、Emma L. Wood
DOI:10.1039/b104674h
日期:——
Improved syntheses and polymerisations are reported of monomers bearing electron transporting substituents based on 2,5-diphenyloxadiazole and 2,3-diphenylquinoxaline attached directly to a vinyl group. By copolymerisation and by use of mixtures of homopolymers, these materials have been incorporated into light emitting polymer devices in which hole conduction properties are provided by 4-vinyltriphenylamine groups. High luminescence efficiency is achieved by use of a fluorescent additive. The resulting devices show narrow emission bands and high brightnesses, except in the case of those based on a diphenyloxadiazole–triphenylamine polymer blend. Thermal analysis data are equivocal but we present evidence that in this system, but not the quinoxaline blend, phase separation occurs. The minority charge carrying capacity of the homopolymers is probed: it is shown that the quinoxaline derivative has hole blocking properties superior to those of the oxadiazole polymer and is
a good candidate for use in optimised devices.
报道了基于2,5-二苯基噁二唑和2,3-二苯基喹喔啉的电子传输取代基单体的改进合成和聚合。这些单体直接连接到乙烯基团。通过共聚合和使用均聚物的混合物,这些材料被纳入到发光聚合物器件中,其中4-乙烯基三苯胺基团提供了孔导电特性。通过使用荧光添加剂,获得了高的发光效率。所得到的器件显示出窄的发射带和高亮度,除了基于二苯基噁二唑-三苯胺聚合物混合物的器件外。热分析数据并不明确,但我们提供证据表明,在该系统中发生了相分离,而在喹喔啉混合物中没有发生。探测了均聚物的少数电荷载流能力:结果表明,喹喔啉衍生物的孔阻断性能优于噁二唑聚合物,且是优化器件中使用的良好候选材料。