title: Synthesis, structure, photoluminescence, and electroluminescence of siloles that contain planar fluorescent chromophores.
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).
authors: College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036 (China).
authors: Bin
authors: B
authors: Chen
authors: Yibin
authors: Y
authors: Jiang
authors: Bairong
authors: B
authors: He
authors: Jian
authors: J
authors: Zhou
authors: Herman H Y
authors: HH
authors: Sung
authors: Ian D
authors: ID
authors: Williams
authors: Ping
authors: P
authors: Lu
authors: Hoi Sing
authors: HS
authors: Kwok
authors: Huayu
authors: H
authors: Qiu
authors: Zujin
authors: Z
authors: Zhao
authors: Ben Zhong
authors: BZ
authors: Tang
mesh_terms: D055664:Electrochemical Techniques; D005456:Fluorescent Dyes / Q000737:chemistry*; D049449:Luminescence; D015394:Molecular Structure; D012821:Silanes / Q000138:chemical synthesis / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D005456:Fluorescent Dyes; D012821:Silanes; C540376:silole
keywords: chromophores; conjugation; electroluminescence; fluorescence; siloles