高效稳定的单层聚合物发光二极管

有机发光二极管（OLED）作为主流显示技术已在全球范围内得到广泛应用。然而OLED产业面临器件制备成本高昂、难以大面积成型且稳定性较低等迫切问题。这些问题反应到基础科学问题上是人们对有机半导体内制约电荷传输、器件效率与稳定性的关键物理机制尚缺乏充分理解。陷阱效应是导致有机半导体内电荷传输不平衡与器件内量子效率耗损的关键物理过程。同时我们近期研究证实空穴陷阱形成造成了聚合物发光二极管的老化现象。因此，本项目拟从分子设计出发，通过合成具有不同共轭程度的聚合物发光体系，结合相应器件的电学表征与器件模拟，探索有机半导体内电荷陷阱本质与器件统一老化机制。在此基础上，设计具有高效电荷传输且兼具高发光效率与高稳定性的聚合物发光体系，以单层聚合物半导体实现溶液加工高效稳定的发光二极管。

Organic light-emitting diodes (OLEDs) have already been commercially used and become the main-stream display technology nowadays. However, to realize low-cost and large scale OLED displays with enhanced stability is still a big challenge. The reason is that the key process which limits the charge transport, efficiency and stability of the OLEDs is still not well understood. It is known that trapping effect leads to imbalanced hole and electron transport in organic semiconductors and efficiency loss in organic LEDs. Our recent research has demonstrated the degradation of polymer LEDs is attributed to hole trap formation. Therefore, in this proposed project we will systematically investigate the origin of traps and the unified degradation mechanism of organic LEDs based on a series of semiconducting polymers with different conjugation. By eliminating trapping effect and suppressing trap formation, a solution-processable stable and efficient single-layer LED based on polymeric semiconductor will be realized.