Spiroborate-Based Host Materials with High Triplet Energies and Ambipolar Charge-Transport Properties |
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| Authors: | Dr Masahiro Hayakawa Mayu Kameda Ryosuke Kawasumi Dr Soichiro Nakatsuka Dr Nobuhiro Yasuda Prof?Dr Takuji Hatakeyama |
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| Institution: | 1. Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502 Japan;2. Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 1 Gakuen Uegahara, Sanda, Hyogo, 669-1330 Japan;3. SK JNC Japan Co., Ltd., 5-1 Goi Kaigan, Ichihara, Chiba, 290-8551 Japan;4. Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198 Japan |
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| Abstract: | Organic light-emitting diodes (OLEDs) receive considerable attention because of their commercial use in flat panel displays. Herein, highly efficient spiroborate-based host materials are reported for use in blue OLEDs. Our designed spiroborates ( SBOX ) were simple to synthesize and exhibited high triplet excitation energies, narrow S-T gaps, and balanced charge carrier mobilities. A blue OLED containing one of the designed spiroborates, SBON , as a host exhibited a high external quantum efficiency (27.6 %) and low turn-on voltage (3.7 V) compared to those observed using 3,3′-di(9H-carbazol-9-yl)-1,1′-biphenyl (17.6 % and 4.5 V, respectively), indicating their potential as host materials in OLEDs. |
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| Keywords: | Ambipolar Charge Transport High Triplet Energy Host Organic Light-Emitting Diodes Spiroborate |
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