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Issue 31, 2018
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Linearly polarized photoluminescence from an asymmetric cyclophane showing thermo- and mechanoresponsive luminescence

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Abstract

The first cyclophane to exhibit linearly polarized photoluminescence in the liquid-crystalline and crystalline states is described. An asymmetric cyclophane featuring a 4,7-bis(phenylethynyl)-2,1,3-benzothiadiazole group forms a thermodynamically metastable nematic liquid-crystalline phase at room temperature. The compound sandwiched between two glass substrates coated with rubbed polyimide thin layers exhibits homogeneous alignment after shearing. The transition dipole moments of the luminophores align along the rubbing direction. As a result, linearly polarized photoluminescence is achieved at room temperature without any other host materials. Furthermore, the polarized emission is retained after the transition to the crystalline phase, which is induced by annealing at 60 °C for 1 h. The cyclophane also shows a thermal and mechanical stimuli-induced change in the photoluminescence colors.

Graphical abstract: Linearly polarized photoluminescence from an asymmetric cyclophane showing thermo- and mechanoresponsive luminescence

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Publication details

The article was received on 14 Jun 2018, accepted on 18 Jul 2018 and first published on 19 Jul 2018


Article type: Paper
DOI: 10.1039/C8TC02919A
Citation: J. Mater. Chem. C, 2018,6, 8453-8459
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    Linearly polarized photoluminescence from an asymmetric cyclophane showing thermo- and mechanoresponsive luminescence

    Y. Sagara, A. Seki, Y. Kim and N. Tamaoki, J. Mater. Chem. C, 2018, 6, 8453
    DOI: 10.1039/C8TC02919A

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