Fluorene-containing tetraphenylethylene molecules as lasing materials |
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| Authors: | C Orofino C Foucher F Farrell N J Findlay B Breig A L Kanibolotsky B Guilhabert F Vilela N Laurand M D Dawson P J Skabara |
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| Institution: | 1. WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL UK;2. Institute of Photonics, Department of Physics, University of Strathclyde, Glasgow, G1 1RD;3. WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL UK
Institute of Physical-Organic Chemistry and Coal Chemistry, Kyiv, 02160 Ukraine;4. School of Engineering and Physical Sciences, Chemical Sciences, Heriot Watt University, Edinburgh, EH14 4AS UK |
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| Abstract: | A series of star-shaped oligofluorene molecules, each containing a TPE core, have been specifically designed and produced to show effective aggregation-induced emission (AIE). Each molecule differs either in the number of fluorene units within the arms (e.g., 1 or 4, compounds 4 and 5 ), or the terminal group positioned at the end of each arm (e.g., H, TMS, or TPA, compounds 4 , 6 , and 7 ). Although they are all poor emitters in solution phase they become efficient yellow-green luminogens in the condensed state. Their AIE properties were investigated in THF/H2O mixtures, with each molecule exhibiting a clear emission enhancement at specific water contents. An all-organic distributed feedback (DFB) laser was fabricated using compound 4 as the gain material and exhibited an average threshold energy fluence of 60 ± 6 μJ/cm2 and emission in the green region. Furthermore, piezofluorochromism studies on a thin film of this material displayed a linear dependence of the amplified spontaneous emission (ASE) peak position on applied pressure, indicating potential applications as lasing-based pressure sensors. © 2016 The Authors. Journal of Polymer Science Part A: Polymer Chemistry Published by Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 734–746 |
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| Keywords: | Synthesis oligomers photophysics aggregation induced emission piezofluorochromism |
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