Selective Introduction of Carbazole and Diphenylamine into Spirofluorenexanthene Core for Different Phosphorescent Hosts |
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| Authors: | Mingli Sun Shouzhen Yue Hongtao Cao Changjin Ou Yan Qian Ting Wang Ligang Chen Yi Zhao Wei Huang |
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| Affiliation: | 1. Department of Chemistry, College of Science, Northeast Forestry University, Harbin, Heilongjiang 150040, China;2. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin 130013, China;3. Center for Molecular Systems and Organic Devices (CMSOD), Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, Jiangsu 210023, China |
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| Abstract: | Built on the spiro[fluorene‐9,9′‐xanthene] (SFX) core and two frequently‐used hole‐transporting groups such as carbazole and diphenylamine, two SFX derivatives, namely SFXCz and SFXDPA, have been synthesized by one‐step reaction for red, green and blue phosphorescent organic light‐emitting devices (PHOLEDs). Though the properties of these two groups are very similar, the devices based on SFXCz and SFXDPA exhibit distinct performances. In blue PHOLEDs, the device based on SFXCz exhibited much better performances than that based on SFXDPA. However, the latter was superior to the former in green and red PHOLEDs. And the red PHOLED based on SFXDPA exhibited maximum current efficiency (CE) of 27.1 cd·A?1, power efficiency (PE) of 25.0 lm·W?1, and external quantum efficiency (EQE) of 15.0%. The results show that the introduction of diphenylamine group is suitable for constructing green and red host materials, whereas the introduction of carbazole group is suitable for constructing blue host materials. |
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| Keywords: | spirofluorenexanthene organic light‐emitting diode host materials triplet energy level charge transport electroluminescence |
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