2,3-Disubstituted Fluorene Scaffold for Efficient Green Phosphorescent Organic Light-Emitting Diodes |
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| Authors: | Jia-Jia Wei Yong-Jian Yang Dr Xiang-Yang Liu Dr Runlai Li Prof Dr Shu-an Li |
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| Institution: | 1. School of Environment and Chemical Engineering, Jiangsu Ocean University, 59 Cangwu Road, Haizhou District, Lianyungang, 222005 P. R. China;2. WISPO Advanced Materials (Suzhou) Co., Ltd., 200 Xingpu Road, Shengpu Street, Suzhou Industrial Park (SIP), Suzhou, 215126 P. R. China;3. College of Polymer Science & Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 P. R. China |
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| Abstract: | Fluorene is a classic three-membered polycyclic aromatic hydrocarbon, and it has been widely used in optoelectronic devices. Here we explore a simple and efficient strategy for the derivatization at the 2- and 3- positions in fluorene unit. By introducing different types of substituents, we design two pairs of 2,3-disubstituted fluorene isomers and use them as host materials for phosphorescent organic light-emitting diodes (PHOLEDs). The green PHOLEDs hosted by these fluorene derivatives realize high external quantum efficiencies (EQE) over 20 % with low efficiency roll-off. Particularly, the devices hosted by 2TRz3TPA and 2TPA3TRz achieve nearly 24 % EQE and 104 lm W−1 power efficiency. These results clearly demonstrate that the 2,3-disubstituted fluorene platforms are potentially useful for constructing host materials. |
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| Keywords: | fluorene derivatives green device high efficiency host materials PHOLEDs roll-off triplet energy |
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