Park Woongbae, Yoon Sung Cheol, Lee Jaemin
Advanced Materials Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Korea.
J Nanosci Nanotechnol. 2019 Aug 1;19(8):4578-4582. doi: 10.1166/jnn.2019.16681.
Achieving well-defined multilayer structure is a key to improve device performance of organic light-emitting diodes (OLEDs), especially in solution-processed OLEDs. Use of cross-linkable hole-transporting materials (HTMs) is therefore gaining much attention to achieve such multilayer structures. One of representative solution-processable HTM is TFB, poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4'-(N-(4-sec-butylphenyl)diphenylamine)], but it does not have any cross-linkable units in its chemical structures. In this work, we performed basic physical characterization of a new cross-linkable HTM, HL-X026, and we also investigated its OLED characteristics. Actual solvent resistance by varying the thermal curing temperatures was measured. The thermally cross-linkable HL-X026 showed better device performances than simple TFB with higher luminance and efficiencies.
实现明确的多层结构是提高有机发光二极管（OLED）器件性能的关键，尤其是在溶液处理的OLED中。因此，使用可交联的空穴传输材料（HTM）来实现这种多层结构备受关注。具有代表性的可溶液处理的HTM之一是TFB，聚[（9,9-二辛基芴-2,7-二基）-co-（4,4'-（N-（4-仲丁基苯基）二苯胺）]，但其化学结构中没有任何可交联单元。在这项工作中，我们对一种新型可交联HTM HL-X026进行了基本物理表征，还研究了其OLED特性。通过改变热固化温度测量了实际耐溶剂性。热可交联的HL-X026比简单的TFB表现出更好的器件性能，具有更高的亮度和效率。
