Organic electronics p. 85 - 92 (2019)
Update date:2022-08-16
Topics:
Wu, Sen
Liu, Hongli
Sun, Wei
Li, Xianggao
Wang, Shirong
Solution-processable hole transporting materials (HTMs)play a vital role in organic light emitting diodes (OLEDs)with the purpose of reducing costs and improving productivity. Herein, two twisted HTMs N2,N2,N7,N7-tetrakis(4-(3,6-di-tert-butyl-9H- carbazol-9-yl)phenyl)-9,9-dimethyl-9H-fluoren-2,7-diamine (p-BCz-F)and N2,N2,N7, N7-tetrakis(4-(2,7-di-tert-butyl-9H-carbazol-9-yl)phenyl)-9,9-dimethyl-9H-fluoren-2,7-diamine (m-BCz-F), have been successfully synthesized. The two compounds are endowed with superior solubility in common organic solvents, facilitating solution-processed OLEDs. By simply changing position of peripheral tert-butyl moiety, the material performance could be regulated. The HTMs p-BCz-F exhibits superior glass transition temperature (Tg)of 168 °C. Particularly, in terms of mobility, 1.42-fold higher could be also found for p-BCz-F (4.35 × 10?4 cm2V– 1S?1)than m-BCz-F (3.05 × 10?4 cm2V– 1S?1). Similarly, the p-BCz-F-based blue devices with BCzVBi as the emitter show better performance with maximum current efficiency (CE)of 7.05 cd/A and luminance (L)of 23365 cd/m2, corresponding CE of 6.12 cd/A and L of 21055 cd/m2 for m-BCz-F-based devices. In short, the different position of peripheral tert-butyl on carbazolyl moiety will lead to different performance and it provided a simple strategy to design solution-processable HTMs for efficient OLEDs.
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Doi:10.1021/ja00986a004
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