A Versatile Triphenylamine/Fluoranthene‐Based Derivative as a Nondoped Green‐Emitting,Hole‐Transporting Interlayer for Electroluminescent Devices |
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| Authors: | Yi Yuan Guo‐Qiang Zhang Feng Lu Prof? Qing‐Xiao Tong Qing‐Dan Yang Hin‐Wai Mo Dr? Tsz‐Wai Ng Dr? Ming‐Fai Lo Dr? Zheng‐Qing Guo Chuan Wu Prof? Chun‐Sing Lee |
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| Institution: | 1. Department of Chemistry, Shantou University, Guangdong 515063 (P.R. China);2. Center of Super‐Diamond and Advanced Films (COSDAF) & Department of Physics and Materials Science, City University of Hong Kong, Hong Kong (S.A.R. P.R. China);3. Department of Biology and Chemistry, City University of Hong Kong, Hong Kong (S.A.R. P.R. China);4. School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054 (P.R. China) |
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| Abstract: | A new triphenylamine‐bridged fluoranthene derivative, 4‐(7,10‐diphenylfluoranthen‐8‐yl)‐N‐4‐(7,10‐diphenylfluoranthen‐8‐yl)phenyl]‐N‐phenylaniline (BDPFPA), with a high glass transition temperature of 220 °C has been synthesized and characterized. BDPFPA is a highly fluorescent and versatile material that can be used as a nondoped green emitter and as a hole transporter. BDPFPA was used in a standard trilayer device as the emitting layer, which showed a low turn‐on voltage (<3 V) and a high efficiency of 11.6 cd A?1. The device also shows little efficiency roll‐off at high brightness. For example, the efficiency can still be maintained at 11.4 cd A?1 (5.4 lm W?1) at a brightness of 10 000 cd m?2. These results are among the best reported for nondoped fluorescent green organic light‐emitting diodes. A simple bilayer device, in which BDPFPA serves as a hole‐transporting layer, has a maximum power efficiency of 3.3 lm W?1 and the performance is nearly 40 % higher than that of an N,N′‐bis(1‐naphthyl)‐N,N′‐ diphenyl‐1,1′‐biphenyl‐4,4′‐diamine (NPB)‐based standard device. |
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| Keywords: | fluorescence materials science organic light‐emitting diodes structure elucidation triphenylamines |
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