[20p-W521-1~16] 12.4 Organic light-emitting devices and organic transistors

[20p-W521-14] Triarylboron-based thermally activated delayed fluorescence emitters

〇Katsuaki Suzuki¹, Shosei Kubo¹, Katsuyuki Shizu¹, Tatsuya Fukushima¹, Aitsush Wakamiya¹, Yasujiro Murata¹, Chihaya Adachi^2,3, Hironori Kaji¹ (1.ICR, Kyoto Univ., 2.OPERA, Kyushu Univ., 3.ERATO, Kyushu Univ.)

Keywords:Organic light emitting diodes,Thermally activated delayed fluorescence,Organo boron compounds

Triarylboron compounds have attracted muchattention, and found wide use as functional materials becauseof their electron-accepting properties arising from the vacant porbitals on the boron atoms.Inthis study,wedesign andsynthesize new donor–acceptor triarylboron emitters that showthermally activated delayed fluorescence.These emitters dis-play sky-blue to green emission and high photoluminescencequantum yields of 87–100%inhost matrices.Organic light-emitting diodes using these emitting molecules as dopantsexhibit high external quantum efficiencies of 14.0–22.8%,which originate from efficient up-conversion from triplet tosinglet states and subsequent efficient radiative decayfromsinglet to ground states.