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      An Organic Luminescent Molecule: What Will Happen When the “Butterflies” Come Together?

      , , , , , , , ,
      Advanced Materials
      Wiley-Blackwell

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          Electroluminescence in conjugated polymers

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            The nature of .pi.-.pi. interactions

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              Multistimuli two-color luminescence switching via different slip-stacking of highly fluorescent molecular sheets.

              Color tuning and switching of the solid-state luminescence of organic materials are attractive subjects for both the fundamental research and practical applications such as optical recording. We report herein cyanostilbene-based highly luminescent molecular sheets which exhibit two-color fluorescence switching in response to pressure, temperature, and solvent vapor. The origin for the multistimuli luminescence switching is the two-directional shear-sliding capability of molecular sheets, which are formed via intermolecular multiple C-H···N and C-H···O hydrogen bonds. The resulting two distinctive crystal phases are promoted by different modes of local dipole coupling, which cause a substantial alternation of π-π overlap. These changes can be directly correlated with the subsequent intermolecular excitonic and excimeric coupling in both phases, as demonstrated by an in-depth theory-assisted spectroscopic and structural study. Finally, we have prepared a first device demonstrator for rewritable fluorescent optical recording media which showed multistimuli luminescence tuning with fast response. Our multistimuli responsive system is unique in terms of the slip-stacking of molecular sheets and thus provides a novel concept of rewritable fluorescent optical recording media.
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                Author and article information

                Journal
                Advanced Materials
                Adv. Mater.
                Wiley-Blackwell
                09359648
                February 2014
                February 05 2014
                : 26
                : 5
                : 739-745
                Article
                10.1002/adma.201303639
                24306899
                da2658a4-2434-4594-8a1c-ce98d719da8e
                © 2014

                http://doi.wiley.com/10.1002/tdm_license_1.1

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