Steric Modulation of Spiro Structure for Highly Efficient Multiple Resonance Emitters

被引：142

作者：

Qu, Yang-Kun ^{[1
]}

Zhou, Dong-Ying ^{[2
]}

Kong, Fan-Cheng ^{[1
]}

Zheng, Qi ^{[1
]}

Tang, Xun ^{[3
]}

Zhu, Yuan-Hao ^{[1
]}

Huang, Chen-Chao ^{[1
]}

Feng, Zi-Qi ^{[1
]}

Fan, Jian ^{[1
]}

Adachi, Chihaya ^{[3
]}

Liao, Liang-Sheng ^{[1
,4
]}

Jiang, Zuo-Quan ^{[1
]}

机构：

[1] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat, Joint Int Res Lab Carbon Based Funct Mat & Device, 199 Renai Rd, Suzhou 215123, Jiangsu, Peoples R China

[2] Soochow Univ, Soochow Inst Energy & Mat Innovat SIEMIS, Coll Energy, Key Lab Adv Carbon Mat & Wearable Energy Technol, Suzhou 215006, Jiangsu, Peoples R China

[3] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Fukuoka, Japan

[4] Macau Univ Sci & Technol, Macao Inst Mat Sci & Engn, Taipa 999078, Macao, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2022年 / 61卷 / 22期

基金：

中国国家自然科学基金;

关键词：

Fluorescence; Multiple Resonance Thermally Activated Delayed Fluorescence; OLEDs; Spiro Compounds; Steric Effects; EMISSION; DIODES;

D O I：

10.1002/anie.202201886

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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 (approximate to 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 pi-framework.

引用

页数：8

共 57 条

[1]

[Anonymous], 2021, ANGEW CHEM, V133, P5273

[2] Microscopic determination of the interlayer binding energy in graphite [J].