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Diamine-cored tetrastilbene compounds as solution-processable hole transport materials for stable organic light emitting diodes
Dyes and Pigments ( IF 4.5 ) Pub Date : 2017-10-20 , DOI: 10.1016/j.dyepig.2017.10.016
Min Jy Cho , Kyu Min Sim , Sa-Rang Bae , Hye Ok Choi , Soo Young Kim , Dae Sung Chung , Kwangyong Park

A series of diamine-cored tetrastilbene (DTS) derivatives bearing various aliphatic and aromatic substituents was designed and synthesized for use as solution-processed hole transport layers (HTLs) in organic light emitting diodes (OLEDs). The chemical structures of the DTS derivatives were strategically designed to increase solubility in organic solvents as well as to avoid self-crystallization, and thus ensure a stable morphology under Joule heating while maintaining efficient hole transport capabilities. The five DTS derivatives, composed of different conjugation structures, yielded reasonably good hole transport behavior with a marginal charge carrier mobility of ∼10−5 cm2V−1s−1, which is similar to that of vacuum-deposited N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB). Due to the high glass transition temperatures of the DTS derivatives, this satisfactory charge transport behavior and smooth surface morphology were conserved up to 180 °C. Green OLEDs were prepared using tris-(8-hydroxyquinoline) aluminum (Alq3):C545T as the emission layer, and the OLED performances of the solution-processed DTS HTLs and the vacuum-deposited NPB HTL were compared. A high luminance efficiency of 11.5 cd A−1 was obtained for one solution-processed DTS HTL, which exceeds that of the NPB HTL (10.01 cd A−1). Furthermore, the DTS HTLs enabled a stable OLED operation, with double the accelerated half-life of the NPB-based device.



中文翻译:

二胺类四苯乙烯化合物作为可溶液加工的空穴传输材料,用于稳定的有机发光二极管

设计并合成了一系列带有各种脂族和芳族取代基的二胺核四苯乙烯(DTS)衍生物,用作有机发光二极管(OLED)中的溶液处理空穴传输层(HTL)。DTS衍生物的化学结构经过战略性设计,旨在增加在有机溶剂中的溶解度并避免自结晶,从而确保在焦耳加热下保持稳定的形态,同时保持有效的空穴传输能力。由不同的共轭结构组成的五种DTS衍生物产生了相当好的空穴传输行为,其边际电荷载流子迁移率为〜10 -5 cm 2 V -1 s -1,与真空沉积的近似N,N′-双(1-萘基)-N,N′-二苯基-1,1′-联苯-4,4′-二胺(NPB)。由于DTS衍生物的玻璃化转变温度高,这种令人满意的电荷传输行为和光滑的表面形态在高达180°C的温度下得以保留。使用三-(8-羟基喹啉)铝(Alq 3):C545T作为发光层制备绿色OLED ,并比较了溶液处理的DTS HTL和真空沉积的NPB HTL的OLED性能。对于一种溶液处理的DTS HTL,获得了11.5 cd A -1的高发光效率,超过了NPB HTL(10.01 cd A -1)。此外,DTS HTL能够实现稳定的OLED操作,并使基于NPB的设备的加速半衰期延长一倍。

更新日期:2017-10-20
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