基于三元硼-氧-氮嵌入多环芳烃体系实现37.1%的绿色电致发光效率和0.09电子伏特的半高宽。
Achieving 37.1% Green Electroluminescent Efficiency and 0.09 eV Full Width at Half Maximum Based on a Ternary Boron-Oxygen-Nitrogen Embedded Polycyclic Aromatic System.
作者信息
Cai Xinliang, Xue Jianan, Li Chenglong, Liang Baoyan, Ying Ao, Tan Yao, Gong Shaolong, Wang Yue
机构信息
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
Jihua Laboratory, 28 Huandao South Road, Foshan, 528200, Guangdong Province, P. R. China.
出版信息
Angew Chem Int Ed Engl. 2022 Jun 7;61(23):e202200337. doi: 10.1002/anie.202200337. Epub 2022 Apr 5.
Herein, a ternary boron-oxygen-nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR-TADF), namely DBNO, is developed by adopting the para boron-π-boron and para oxygen-π-oxygen strategy. The designed molecule presents a vivid green emission with a high photoluminescence quantum yield (96 %) and an extremely narrow full width at half maximum (FWHM) of 19 nm/0.09 eV, which surpasses all previously reported green TADF emitters to date. In addition, the long molecular structure along the transition dipole moment direction endows it with a high horizontal emitting dipole ratio of 96 %. The organic light-emitting diode (OLED) based on DBNO reveals a narrowband green emission with a peak at 504 nm and a FWHM of 24 nm/0.12 eV. Particularly, a significantly improved device performance is achieved by the TADF-sensitization (hyperfluorescence) mechanism, presenting a FWHM of 27 nm and a maximum external quantum efficiency (EQE) of 37.1 %.
在此，通过采用对位硼-π-硼和对位氧-π-氧策略，开发了一种具有多重共振热激活延迟荧光（MR-TADF）的三元硼-氧-氮嵌入多环芳烃，即DBNO。所设计的分子呈现出鲜艳的绿色发射，具有高光致发光量子产率（96%）和极窄的半高宽（FWHM），为19 nm/0.09 eV，超过了迄今为止所有先前报道的绿色TADF发光体。此外，沿跃迁偶极矩方向的长分子结构赋予其96%的高横向发射偶极比。基于DBNO的有机发光二极管（OLED）呈现出窄带绿色发射，峰值在504 nm，FWHM为24 nm/0.12 eV。特别地，通过TADF敏化（超荧光）机制实现了显著改善的器件性能，半高宽为27 nm，最大外量子效率（EQE）为37.1%。
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