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Discrete Face-to-Face Stacking of Anthracene Inducing High-Efficiency Excimer Fluorescence in Solids via a Thermally-activated Phase Transition

Abstract

It is always a challenge for planar polycyclic aromatic molecules to achieve high efficiency in solids owing to the frequent encounter with aggregation-caused quenching (ACQ). One more anthracene derivative with one-side meta-substituted triphenylamine (TPA) was found to show high-efficiency excimer fluorescence (ηPL= 76.8%) in G-phase (green) crystal as well as a long lifetime, in sharp contrast with that of monomer in doped film (ηPL= 36.6%) and that of B-phase (blue) crystal (ηPL= 8.1%). In essence, the excimer-induced enhanced emission can be ascribed to the special intermolecular stacking in solid state, namely, discrete antiparallel dimeric stacks between anthracene moieties in G-phase crystal, which is responsible for the greatly suppressed non-radiative deactivation due to uniform emissive state preventing the formation of energy-trapping “dark” state. Moreover, G-phase could be obtained through thermally-activated phase transition from B-phase crystal, corresponding to the completely synchronized change of fluorescence properties. The present results consolidate a novel strategy of designing discrete dimeric stack of planar polycyclic aromatic molecules to achieve high-efficiency fluorescence in solid state by excimer-induced enhanced emission (EIEE) mechanism.

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Publication details

The article was received on 19 Jul 2017, accepted on 30 Aug 2017 and first published on 30 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC03229C
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Discrete Face-to-Face Stacking of Anthracene Inducing High-Efficiency Excimer Fluorescence in Solids via a Thermally-activated Phase Transition

    Y. Shen, H. Liu, S. Zhang, Y. Gao, B. Li, Y. Yan, Y. Hu, L. Zhao and B. Yang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03229C

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