Highly Emissive 9-Borafluorene Derivatives: Synthesis,Photophysical Properties and Device Fabrication |
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| Authors: | Xing Chen Dr Guoyun Meng Guanming Liao Dr Florian Rauch Dr Jiang He Dr Alexandra Friedrich Prof?Dr Todd B Marder Dr Nan Wang Dr Pangkuan Chen Prof?Dr Suning Wang Dr Xiaodong Yin |
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| Institution: | 1. 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;2. Institut für Anorganische Chemie, Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany;3. 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
Department of Chemistry, Queen's University, Kingston, ON, K7L3N6 Canada |
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| Abstract: | 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?2. 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. |
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| Keywords: | boron heterocycles density functional calculations luminescence organic light-emitting diodes photophysics |
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