TY - JOUR
T1 - Sequential Multiple Borylation Toward an Ultrapure Green Thermally Activated Delayed Fluorescence Material
AU - Uemura, Shigetada
AU - Oda, Susumu
AU - Hayakawa, Masahiro
AU - Kawasumi, Ryosuke
AU - Ikeda, Naoya
AU - Lee, Yi Ting
AU - Chan, Chin Yiu
AU - Tsuchiya, Youichi
AU - Adachi, Chihaya
AU - Hatakeyama, Takuji
N1 - Funding Information:
This study was supported by JST CREST (grant number JPMJCR22B3) and JSPS KAKENHI (grant numbers 20H05863, 21H02019, and 21H05408). The authors are grateful to Drs. Masakazu Kondo and Takeshi Matsushita for their experimental support and valuable input. The X-ray crystal structure analysis was performed at BL40XU at the SPring-8 facility with the approval of JASRI (2019A1142, 2019B1063, 2020A1066, 2021B1125, and 2022A1114) and the help of Dr. Nobuhiro Yasuda (JASRI).
Publisher Copyright:
© 2022 American Chemical Society.
PY - 2022
Y1 - 2022
N2 - Multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters have emerged as an important component of organic light-emitting diodes (OLEDs) because of their narrowband emission and high exciton utilization efficiency. However, the chemical space of MR-TADF emitters remains mostly unexplored because of the lack of suitable synthetic protocols. Herein, we demonstrate a sequential multiple borylation reaction that provides new synthetically accessible chemical space. ω-DABNA, the proof-of-concept material, exhibited narrowband green TADF with a full width at half-maximum of 22 nm and a small singlet-triplet energy gap of 13 meV. The OLED employing it as an emitter exhibited electroluminescence at 512 nm, with Commission International de l'Éclairage coordinates of (0.13, 0.73) and a high external quantum efficiency (EQE) of 31.1%. Moreover, the device showed minimum efficiency roll-off, with an EQE of 29.4% at 1000 cd m-2.
AB - Multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters have emerged as an important component of organic light-emitting diodes (OLEDs) because of their narrowband emission and high exciton utilization efficiency. However, the chemical space of MR-TADF emitters remains mostly unexplored because of the lack of suitable synthetic protocols. Herein, we demonstrate a sequential multiple borylation reaction that provides new synthetically accessible chemical space. ω-DABNA, the proof-of-concept material, exhibited narrowband green TADF with a full width at half-maximum of 22 nm and a small singlet-triplet energy gap of 13 meV. The OLED employing it as an emitter exhibited electroluminescence at 512 nm, with Commission International de l'Éclairage coordinates of (0.13, 0.73) and a high external quantum efficiency (EQE) of 31.1%. Moreover, the device showed minimum efficiency roll-off, with an EQE of 29.4% at 1000 cd m-2.
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U2 - 10.1021/jacs.2c10946
DO - 10.1021/jacs.2c10946
M3 - Article
C2 - 36547020
AN - SCOPUS:85144865401
SN - 0002-7863
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
ER -