Triarylboron‐Based Fluorescent Organic Light‐Emitting Diodes with External Quantum Efficiencies Exceeding 20 %

• DOI: 10.1002/ange.201508270
• Publication Date: 2015-11-13T10:26:41Z
• Authors: Katsuaki Suzuki; Shosei Kubo; Katsuyuki Shizu; Tatsuya Fukushima; Atsushi Wakamiya; Yasujiro Murata; Chihaya Adachi; Hironori Kaji
• Keywords: Quantum Efficiency; Acceptor

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 boron atoms. In this study, we design synthesize new donor–acceptor triarylboron emitters that show thermally activated delayed fluorescence. These display sky‐blue to green emission high photoluminescence quantum yields 87–100 % in host matrices. Organic light‐emitting diodes using these emitting molecules dopants exhibit external efficiencies 14.0–22.8 %, which originate efficient up‐conversion triplet singlet states subsequent radiative decay ground states.