Synthesis,Structure, Photoluminescence,and Electroluminescence of Siloles that Contain Planar Fluorescent Chromophores |
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| Authors: | Bin Chen Yibin Jiang Bairong He Dr. Jian Zhou Dr. Herman H. Y. Sung Prof. Ian D. Williams Dr. Ping Lu Prof. Hoi Sing Kwok Prof. Huayu Qiu Prof. Zujin Zhao Prof. Ben Zhong Tang |
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| Affiliation: | 1. College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036 (China);2. Center for Display Research, The Hong Kong University of Science & Technology (HKUST), Kowloon, Hong Kong (China);3. Department of Chemistry, Division of Biomedical Engineering, Institute for Advanced Study and Institute of Molecular Functional Materials, HKUST, Kowloon, Hong Kong (China);4. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012 (China);5. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640 (China) |
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| Abstract: | ![]()
Herein, a new series of siloles that were 2,5‐substituted with planar fluorescent chromophores (PFCs), including fluorene, fluoranthene, naphthalene, pyrene, and anthracene, were synthesized and characterized. These compounds showed weak emission in the solution state, owing to active intramolecular rotation (IMR), but the synergistic effect from electronic coupling between the PFC and the silole ring compensated for the emission quenching by the IMR process to some extent, thereby affording higher emission efficiencies than those of 2,3,4,5‐tetraphenylsiloles in solution. These new siloles showed enhanced emission efficiencies in the aggregated state. The electroluminescence (EL) color and efficiency of new siloles were sensitive towards the PFC. Siloles containing naphthalene moieties showed green EL emission, whilst those containing anthracene moieties showed orange EL emission. The siloles containing pyrene moieties exhibited yellow EL emission at 546 nm, with a peak luminance of 49000 cd cm?2 and a high current efficiency of 9.1 cd A?1. |
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| Keywords: | chromophores conjugation electroluminescence fluorescence siloles |
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