Chen Xing, Meng Guoyun, Liao Guanming, Rauch Florian, He Jiang, Friedrich Alexandra, Marder Todd B, Wang Nan, Chen Pangkuan, Wang Suning, Yin Xiaodong
Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 102488, Beijing, P.R. China.
Institut für Anorganische Chemie, Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
Chemistry. 2021 Apr 7;27(20):6274-6282. doi: 10.1002/chem.202005185. Epub 2021 Mar 10.
A series of 9-borafluorene derivatives, functionalised with electron-donating groups, have been prepared. Some of these 9-borafluorene compounds exhibit strong yellowish emission in solution and in the solid state with relatively high quantum yields (up to 73.6 % for FMesB-Cz as a neat film). The results suggest that the highly twisted donor groups suppress charge transfer, but the intrinsic photophysical properties of the 9-borafluorene systems remain. The new compounds showed enhanced stability towards the atmosphere, and exhibited excellent thermal stability, revealing their potential for application in materials science. Organic light-emitting diode (OLED) devices were fabricated with two of the highly emissive compounds, and they exhibited strong yellow-greenish electroluminescence, with a maximum luminance intensity of >22 000 cd m . These are the first two examples of 9-borafluorene derivatives being used as light-emitting materials in OLED devices, and they have enabled us to achieve a balance between maintaining their intrinsic properties while improving their stability.
一系列用供电子基团官能化的9-硼芴衍生物已被制备出来。其中一些9-硼芴化合物在溶液和固态中均表现出强烈的淡黄色发射，具有相对较高的量子产率（对于FMesB-Cz作为纯膜，高达73.6%）。结果表明，高度扭曲的供体基团抑制了电荷转移，但9-硼芴体系的固有光物理性质得以保留。这些新化合物对大气显示出增强的稳定性，并表现出优异的热稳定性，揭示了它们在材料科学中的应用潜力。用其中两种高发射性化合物制造了有机发光二极管（OLED）器件，它们表现出强烈的黄绿色电致发光，最大亮度强度>22000 cd·m 。这些是9-硼芴衍生物首次被用作OLED器件中的发光材料的两个例子，它们使我们能够在保持其固有性质的同时提高其稳定性之间实现平衡。
