Naphthalene diimide based near-infrared luminogens with aggregation-induced emission characteristics for biological imaging and high mobility ambipolar transistors

• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2020,（9）
• 所属期刊栏目: ARTICLES
• 页码范围: 1198-1207
• 页数: 10页
• 语种: 英文

摘要

Organic conjugated materials combining high conductivity with strong solid-state emission are highly desired for organic electronic applications,yet still rather rare.Herein,a novel luminogen (TEN) comprised by linking naphthalene diimides and triphenyl ethylene with vinyl bridges is reported.TEN exhibits aggregation-induced emission (AIE) behavior of a strong nearinfrared fluorescence over 700 nm and the efficiency above 60.5％ in the solid state,while also shows promising application in vivo bio-imaging with good permeability and extremely low background.Single crystal of TEN reveals intra-and intermolecular C-H…O hydrogen bonds,contributing to an inclined molecular stackingalong the a-axis of the cell,creating a 1D charge carrier transporting channel under a short π-π interaction distance of 3.42 (A),which might benefit the solid emission and charge transport ability simultaneously.Solution processed bottom contact,top gate organic field effect transistors based on TEN reveal a high ambipolar charge transport ability with the hole mobility up to 0.13 cm2 V-1 s-1 and electron mobility up to 0.010 cm2 V-1 s-1.Further atomic force microscopy and X-ray diffraction analysis on TEN thin film confirm the existence of the 1D π-π stacking channel,suggesting the stacking geometry revealed in crystal crucial for facilitating high charge carrier mobility while preserving the strong solid emission at the same time.