蒋佐权教授、廖良生教授及其合作者在Angew. Chem. Int. Ed.上发表论文

Steric Modulation of Spiro Structure for Highly Efficient Multiple Resonance Emitters

作者：

Yang-Kun Qu⁺,¹ Dong-Ying Zhou⁺,² Fan-Cheng Kong⁺,¹ Qi Zheng,¹ Xun Tang,³ Yuan-Hao Zhu,¹ Chen-Chao Huang,¹ Zi-Qi Feng,¹ Jian Fan,¹ Chihaya Adachi,³ Liang-Sheng Liao,^1.4 and Zuo-Quan Jiang*¹

¹Institute of Functional Nano & Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, P.R. China

²College of Energy, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006, Jiangsu, P.R. China

³Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Fukuoka, Japan

⁴Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa 999078, Macau SAR, P.R. China

摘要：

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 spiro structure in π-framework.

影响因子：

15.336

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/anie.202201886