A hole transport material with ortho- linked terphenyl core structure for high power efficiency in blue phosphorescent organic light-emitting diodes |
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| Affiliation: | 1. Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-1, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan;2. Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan;3. ACCEL Program, Japan Science and Technology Agency, Kawaguchi, 332-0012, Japan;1. Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. Department of Chemistry, Hanyang University, Seoul 133-791, Republic of Korea;1. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan;2. Idemitsu Kosan Co. Ltd., 1280 Kami-izumi, Sodegaura, Chiba 299-0293, Japan |
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| Abstract: | A hole transport material for use in blue phosphorescent organic light-emitting diodes was developed using an ortho linked terphenyl core structure. The ortho linked terphenyl core was modified with ditolylamine to yield the N4,N4,N4″,N4″-tetra-p-tolyl-[1,1′:2′,1″-terphenyl]-4,4″-diamine (TTTDA) hole transport material. TTTDA was compared with common 1,3-bis(N-carbazolyl)benzene (mCP) and showed lower driving voltage and higher power efficiency than mCP. The driving voltage was decreased by as much as 1.5 V and the power efficiency was improved by 25%. |
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| Keywords: | Blue device Phosphorescent organic light emitting diodes Driving voltage Power efficiency |
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