题目: | A Quadruple-Borylated Multiple-Resonance Emitter with para/meta Heteroatomic Patterns for Narrowband Orange-Red Emission |
作者: | Xiao-Chun Fan1, Feng Huang1, Hao Wu1, Hui Wang1, Ying-Chun Cheng1, Jia Yu1,2, Kai Wang1,3,* and Xiao-Hong Zhang1,2,* |
单位: | 1Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, P. R. China 2Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, Jiangsu 215123, P. R. China 3Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University Suzhou, Jiangsu 215123 P. R. China |
摘要: | Hindered by spectral broadening issues with redshifted emission, long-wavelength (e.g., maxima beyond 570nm) multiple resonance (MR) emitters with full width at half maxima (FWHMs) below 20nm remain absent. Herein, by strategically embedding diverse boron (B)/nitrogen (N) atomic pairs into a polycyclic aromatic hydrocarbon (PAH) skeleton, we propose a hybrid pattern for the construction of a long-wavelength narrowband MR emitter. The proof-of-concept emitter B4N6-Me realized orange-red emission with an extremely small FWHM of 19nm (energy unit: 70meV), representing the narrowest FWHM among all reported long-wavelength MR emitters. Theoretical calculations revealed that the cooperation of the applied para B-π-N and para B-π-B/N-π-N patterns is complementary, which gives rise to both narrowband and redshift characteristics. The corresponding organic light-emitting diode (OLED) employing B4N6-Me achieved state-of-the-art performance, e.g., a narrowband orange-red emission with an FWHM of 27nm (energy unit: 99meV), an excellent maximum external quantum efficiency (EQE) of 35.8%, and ultralow efficiency roll-off (EQE of 28.4% at 1000cdm−2). This work provides new insights into the further molecular design and synthesis of long-wavelength MR emitters. |
影响因子: | 16.823 |
分区情况: | 一区 |
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责任编辑:郭佳