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He B.,South China University of Technology | Nie H.,South China University of Technology | Chen L.,South China University of Technology | Lou X.,Huazhong University of Science and Technology | And 6 more authors.
Organic Letters

A series of pure hydrocarbon fluorophores containing a pair of π-stacked oligo-p-phenylenes have been synthesized and analyzed by NMR and X-ray crystallography. They show good fluorescence in solutions and enhanced fluorescence in the aggregated state. Large Stokes shifts (up to 214 nm) have been achieved in these folded fluorophores in virtue of intramolecular energy transfer, and balanced structural rigidity and flexibility. These folded fluorophores provide perfect models for understanding the energy and charge transfer process in π-stacked systems. © 2015 American Chemical Society. Source

Lin G.,South China University of Technology | Peng H.,South University of Science and Technology of China | Chen L.,South China University of Technology | Nie H.,South China University of Technology | And 9 more authors.
ACS Applied Materials and Interfaces

Robust light-emitting materials with strong solid-state fluorescence as well as fast and balanced carrier transporting ability are crucial to achieve high-performance organic light-emitting diodes (OLEDs). In this contribution, two linear tetraphenylethene (TPE) derivatives (TPE-TPAPBI and TPE-DPBI) that are functionalized with hole-transporting triphenylamine and/or electron-transporting 1,2-diphenyl-1H-benzimidazole groups are synthesized and fully characterized. Both TPE-TPAPBI and TPE-DPBI have aggregation-induced emission attributes and excellent photoluminescence quantum yields approaching 100% in vacuum deposited films. They also possess good thermal property, giving high decomposition temperatures (480 and 483 °C) and glass-transition temperatures (141 and 157 °C). TPE-TPAPBI and TPE-DPBI present high electron mobilities of 1.80 × 10-5 and 1.30 × 10-4 cm2 V -1 s-1, respectively, at an electric field of 3.6 × 105 V cm-1, which are comparable or even superior to that of 1,3,5-tri(1-phenylbenzimidazol-2-yl)benzene. The nondoped OLED device employing TPE-TPAPBI as active layer performs outstandingly, affording ultrahigh luminance of 125 300 cd m-2, and excellent maximum external quantum, power and current efficiencies of 5.8%, 14.6 lm W-1, and 16.8 cd A-1, respectively, with very small roll-offs, demonstrating that TPE-TPAPBI is a highly promising luminescent material for nondoped OLEDs. © 2016 American Chemical Society. Source

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