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Triarylboron‐Based Fluorescent Organic Light‐Emitting Diodes with External Quantum Efficiencies Exceeding 20 % |
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| Authors: | Dr. Katsuaki Suzuki Shosei Kubo Dr. Katsuyuki Shizu Dr. Tatsuya Fukushima Prof. Dr. Atsushi Wakamiya Prof. Dr. Yasujiro Murata Prof. Dr. Chihaya Adachi Prof. Dr. Hironori Kaji |
| Affiliation: | 1. Institute for Chemical Research Kyoto University, Uji, Kyoto 611‐0011 (Japan);2. Center for Organic Photonics and Electronics Research, Kyushu University, 744 Motooka, Nishi, Fukuoka 819‐0395 (Japan);3. Japan Science and Technology Agency (JST), Exploratory Research for Advanced Technology (ERATO), Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishi, Fukuoka 819‐0395 (Japan) |
| Abstract: | Triarylboron compounds have attracted much attention, and found wide use as functional materials because of their electron‐accepting properties arising from the vacant p orbitals on the boron atoms. In this study, we design and synthesize new donor–acceptor triarylboron emitters that show thermally activated delayed fluorescence. These emitters display sky‐blue to green emission and high photoluminescence quantum yields of 87–100 % in host matrices. Organic light‐emitting diodes using these emitting molecules as dopants exhibit high external quantum efficiencies of 14.0–22.8 %, which originate from efficient up‐conversion from triplet to singlet states and subsequent efficient radiative decay from singlet to ground states. |
| Keywords: | boron donor‐acceptor systems electroluminescence fluorescence organic light‐emitting diodes |