TY - JOUR
T1 - Steric Modulation of Spiro Structure for Highly Efficient Multiple Resonance Emitters
AU - Qu, Yang Kun
AU - Zhou, Dong Ying
AU - Kong, Fan Cheng
AU - Zheng, Qi
AU - Tang, Xun
AU - Zhu, Yuan Hao
AU - Huang, Chen Chao
AU - Feng, Zi Qi
AU - Fan, Jian
AU - Adachi, Chihaya
AU - Liao, Liang Sheng
AU - Jiang, Zuo Quan
N1 - Funding Information:
The authors acknowledge financial support from the National Natural Science Foundation of China (Nos. 51873139, 61961160731, 62175171, and 22175124). This project is also funded by the Suzhou Science and Technology Plan Project (SYG202010), Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Centre of Suzhou Nano Science & Technology (Nano‐CIC), and the “111” Project. The authors thank Prof. Cheng Zhong for the discussion of theoretical analysis and Mr. Ao Ying for the measurement of the horizontal orientation factor.
Funding Information:
The authors acknowledge financial support from the National Natural Science Foundation of China (Nos. 51873139, 61961160731, 62175171, and 22175124). This project is also funded by the Suzhou Science and Technology Plan Project (SYG202010), Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Centre of Suzhou Nano Science & Technology (Nano-CIC), and the “111” Project. The authors thank Prof. Cheng Zhong for the discussion of theoretical analysis and Mr. Ao Ying for the measurement of the horizontal orientation factor.
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022
Y1 - 2022
N2 - A multiple resonance thermally activated delayed fluorescence (MR-TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono-substituted design strategy by introducing spiro-9,9′-bifluorene (SBF) units with different substituted sites into the MR-TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2–35.9 %) and narrow-band emission (≈27 nm). Particularly, the shield-like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3-substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR-TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π-framework.
AB - A multiple resonance thermally activated delayed fluorescence (MR-TADF) molecule with a fused, planar architecture tends to aggregate at high doping ratios, resulting in broad full width at half maximum (FWHM), redshifting electroluminescence peaks, and low device efficiency. Herein, we propose a mono-substituted design strategy by introducing spiro-9,9′-bifluorene (SBF) units with different substituted sites into the MR-TADF system for the first time. As a classic steric group, SBF can hinder interchromophore interactions, leading to high device efficiency (32.2–35.9 %) and narrow-band emission (≈27 nm). Particularly, the shield-like molecule, SF1BN, seldom exhibits a broadened FWHM as the doping ratio rises, which differs from the C3-substituted isomer and unhindered parent emitter. These results manifest an effective method for constructing highly efficient MR-TADF emitters through a spiro strategy and elucidate the feasibility for steric modulation of the spiro structure in π-framework.
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U2 - 10.1002/anie.202201886
DO - 10.1002/anie.202201886
M3 - Article
C2 - 35293091
AN - SCOPUS:85127505674
SN - 1433-7851
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
ER -