Li Mengke, Li Zhizhi, Peng Xiaomei, Liu Denghui, Chen Zijian, Xie Wentao, Liu Kunkun, Su Shi-Jian
Guangdong Basic Research Center of Excellence for Energy and Information Polymer Materials, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Wushan Road 381, Tianhe District, Guangzhou, 510640, Guangdong Province, P. R. China.
Angew Chem Int Ed Engl. 2025 Feb 17;64(8):e202420474. doi: 10.1002/anie.202420474. Epub 2025 Jan 5.
The exploration of circularly polarized luminescence is important for advancing display and lighting technologies. Herein, by utilizing isomeric molecular engineering, a novel series of chiral molecules are designed to exploit both thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP) mechanisms for efficient luminescence. The cooperation of a small singlet-triplet energy gap, moderate spin-orbital coupling (SOC), and large oscillator strength enables efficient TADF emission, with photoluminescence quantum yields exceeding 90 %. By altering the symmetry of molecular structures, it is demonstrated that the intrinsic electronic SOC and vibrational SOC effects can be greatly enhanced to facilitate RTP emission. Notably, through modulating simultaneous TADF and RTP emissions, single-molecule white emission is successfully achieved. Accordingly, the TADF-based organic light-emitting diode (OLED) achieves a maximum external quantum efficiency up to 30 %, representing exceptional performance of non-aromatic amine-based emitters. Furthermore, the first single-molecule white OLED based on TADF and RTP dual-emissive chiral material is developed, establishing a benchmark for the development of advanced display and lighting technologies.
圆偏振发光的探索对于推进显示和照明技术至关重要。在此，通过利用异构体分子工程，设计了一系列新型手性分子，以利用热激活延迟荧光（TADF）和室温磷光（RTP）机制实现高效发光。小的单重态-三重态能隙、适度的自旋-轨道耦合（SOC）和大的振子强度的协同作用实现了高效的TADF发射，光致发光量子产率超过90%。通过改变分子结构的对称性，证明可以大大增强本征电子SOC和振动SOC效应以促进RTP发射。值得注意的是，通过调节同时的TADF和RTP发射，成功实现了单分子白色发射。因此，基于TADF的有机发光二极管（OLED）实现了高达30%的最大外量子效率，代表了非芳香胺基发光体的卓越性能。此外，开发了首个基于TADF和RTP双发射手性材料的单分子白色OLED，为先进显示和照明技术的发展建立了基准。
