期刊
ADVANCED FUNCTIONAL MATERIALS
卷 22, 期 2, 页码 378-389出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201102030
关键词
aggregation-induced emission; electroluminescence; explosives; chemosensors; photoluminescence
类别
资金
- HKUST [RPC11SC09, RPC10SC13]
- Research Grants Council of Hong Kong [604711, 603509, HKUST2/CRF/10]
- National Natural Science Foundation of China [20634020, 20974028]
- University Grants Committee of Hong Kong [AoE/P-03/08]
- Cao Guangbiao Foundation of Zhejiang University
Benzene-cored luminogens with multiple triarylvinyl units are designed and synthesized. These propeller-shaped molecules are nonemissive when dissolved in good solvents, but become highly emissive when aggregated in poor solvents or in the solid state, showing the novel phenomenon of aggregation-induced emission. Restriction of intramolecular motion is identified as the main cause for this effect. Thanks to their high solid-state fluorescence quantum yields (up to unity) and high thermal and morphological stabilities, light-emitting diodes with the luminogens as emitters give sky-blue to greenish-blue light in high luminance and efficiencies of 10800 cd m-2, 5.8 cd A-1, and 2.7%, respectively. The emissions of the nanoaggregates of the luminogens can be quenched exponentially by picric acid, or selectively by Ru3+, with quenching constants up to 105 and similar to 2.0 x 105 L mol-1, respectively, making them highly sensitive (and selective) chemosensors for explosives and metal ions.
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