Je Hyeondoo, Cho Min Ju, Kwon Na Yeon, Park Su Hong, Kang Min Ji, Baek Heume Il, Youn Junho, Han Chang Wook, Choi Dong Hoon
Department of Chemistry, Research Institute for Natural Sciences, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
LG Display, E2 Block LG Science Park 30, Magokjungang 10-ro, Gangseo-gu, Seoul 07796, Korea.
ACS Appl Mater Interfaces. 2023 Feb 22;15(7):9792-9799. doi: 10.1021/acsami.2c23092. Epub 2023 Feb 13.
To obtain high-efficiency solution-processed organic light-emitting diodes (OLEDs), a hole transport material (HTM) capable of solution processing with excellent charge transport properties is required. In this study, a new vinyl polymer () containing hole-transporting 1,3-di(9-carbazol-9-yl)benzene (mCP) in the side chain was successfully synthesized via radical polymerization. showed good film-forming ability and thermal stability. Moreover, has a higher triplet energy value and hole mobility than poly(-vinylcarbazole) (PVK) used as a reference HTM, which can be applied as a hole transport layer (HTL) in thermally activated delayed fluorescence (TADF) OLEDs, providing green and blue emissions. -based solution-processable TADF-OLEDs containing green- and blue-emitting layers were easily fabricated without damaging the lower HTL while using ethyl acetate as an orthogonal solvent. The corresponding OLEDs possess high external quantum efficiencies of 29.60% and 11.00% for the green- and blue-emitting devices, respectively. They show superior performances compared to PVK-based devices used as a reference. It was confirmed that as a solution-processable HTM can replace PVK and is universally applicable to both green- and blue-emitting devices.
为了获得高效溶液处理的有机发光二极管（OLED），需要一种能够进行溶液处理且具有优异电荷传输性能的空穴传输材料（HTM）。在本研究中，通过自由基聚合成功合成了一种在侧链中含有空穴传输基团1,3-二（9-咔唑-9-基）苯（mCP）的新型乙烯基聚合物（ ）。 表现出良好的成膜能力和热稳定性。此外，与用作参考HTM的聚（乙烯基咔唑）（PVK）相比， 具有更高的三线态能量值和空穴迁移率，可作为热激活延迟荧光（TADF）OLED中的空穴传输层（HTL），实现绿色和蓝色发光。以 为基础的、包含绿色和蓝色发光层的可溶液处理TADF-OLED在使用乙酸乙酯作为正交溶剂时，易于制备且不会损坏下层HTL。相应的OLED中，绿色和蓝色发光器件的外量子效率分别高达29.60%和11.00%。与用作参考的基于PVK的器件相比，它们表现出优异的性能。证实了作为可溶液处理的HTM， 可以替代PVK，并且普遍适用于绿色和蓝色发光器件。
