Tailoring electronic structure of organic host for high-performance phosphorescent organic light-emitting diodes |
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Authors: | Jing Xiao Xiao-Ke Liu Xin-Xin Wang Cai-Jun Zheng Feng Li |
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Affiliation: | 1. College of Physics and Electronic Engineering, Taishan University, Taian, Shandong 271021, PR China;2. Nano-Organic Photoelectronic Laboratory and Key Laboratory of Photochemical Conversion & Optoelectronic Materials, Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;3. Institute of Functional Nano & Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science & Technology, Soochow University, Suzhou, Jiangsu 215123, PR China |
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Abstract: | We investigated highly efficient phosphorescent organic light-emitting diodes (PHOLEDs) based on three novel 1,3,5-triazine derivatives as the host materials and two kinds of iridium complexes as the guests, respectively. For comparison, the devices using a common phosphorescent host 4,4′-N,N′-dicarbazolebiphenyl (CBP) have also been fabricated. Results show that the devices using 9-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-9H-carbazole (PTC) and 4-(4,6-diphenoxy-1,3,5-triazin-2-yl)-N,N-diphenylaniline (POTA) as host have better performance than that of CBP. In comparison with the PHOLEDs based on CBP host, PTC- and POTA-based PHOLEDs show significantly lower driving voltages and higher power efficiencies. The high bipolar carrier mobility of the host is found to be critical to this kind of doping system, which would balance the injection of both carriers and improve efficiency. |
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Keywords: | Phosphorescent organic light-emitting diodes Novel 1,3,5-triazine derivatives Iridium complexes Energy-transfer Bipolar carrier mobility |
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