OLED电子传输材料研究进展  

Recent Advances on Electronic Transport Materials in OLEDs

作　　者：唐振宇 郭浩清 肖静[2] 陈志坚[1] 肖立新[1] TANG Zhenyu;GUO Haoqing;XIAO Jing;CHEN Zhijian;XIAO Lixin(State Key Laboratory for Artificial Microstructures and Mesoscopic Physics,Department of Physics,Peking University,Beijing 100871,China;College of Physics and Electronic Engineering,Taishan University,Taian,271000,China)

机构地区：[1]北京大学物理学院,人工微结构和介观物理国家重点实验室,北京100871 [2]泰山学院物理与电子工程学院,山东泰安271000

出　　处：《发光学报》2023年第1期26-36,共11页Chinese Journal of Luminescence

基　　金：国家自然科学基金(61935016,52173153,12174013);山东省自然科学基金(ZR2022MF271);山东省青创人才引育计划项目(2019)。

摘　　要：有机电致发光(OLED)是目前最有竞争力的显示技术,市场占有量逐年攀升。高效、稳定的OLED,特别是深蓝光器件,性能仍需提升,其关键问题是高性能的电子传输材料的研发。这是由于有机分子难以获得较高电子迁移率,器件中的复合区域通常靠近电子传输层一侧,这就要求电子传输材料需要具有较高三线态能级来限域激子,尤其是高能量的蓝光激子。而高三线态(弱共轭)和高迁移率(强共轭)一直是有机分子设计中难以调和的矛盾,此外更宽的带隙也会导致较差的热稳定性,这些难题始终限制着OLED电子传输材料的发展。本文分类介绍了高性能的电子传输材料所需要具备的几点特性,包括热稳定性、光化学稳定性、电子迁移率、前线轨道能级和三重态能级等,并且综述了21世纪以来OLED小分子电子传输材料的重要研究进展,以期对未来开发理想的电子传输材料提供参考。Organic light emitting diodes(OLED)technology is considered to be the next generation of display technology,and has gradually occupied the mainstream of the market,but the performance of OLED is still largely limited by electron transport materials,especially in high-performance deep blue light devices.Because it is difficult for organic molecules to obtain high electron mobility,and the recombination zone in the device is usually close to the interface of the electron transport layer,which requires the electron transport material to have a high triplet energy level to confine the exciton,especially the blue light exciton with high energy.However,high triplet states(poor conjugation)and high mobility(strong conjugation)have always been difficult to reconcile in the design of organic molecules,and a wider band gap will also lead to poorer thermal stability.These problems have been affecting the development of OLED electronic transport materials.In this paper,several elements of high performance electronic transport materials are introduced,including thermal stability,photochemical stability,electron mobility,the frontier orbital and the triplet energy level and so on.And the important research progresses of the micromolecular electron transport materials in 21st century are summarized,in order to provide the reference for the development of the ideal electronic transfer materials in the future.

关 键 词：有机电致发光 电子传输材料 稳定性 电子迁移率 三重态能级 

分 类 号：O482.31[理学—固体物理]