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Issue 40, 2019
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One-dimensional π–π stacking induces highly efficient pure organic room-temperature phosphorescence and ternary-emission single-molecule white light

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Abstract

It is extremely challenging to achieve high-efficiency room-temperature phosphorescence (RTP) in pure organic metal-free systems. Herein, we systematically investigated the photophysical properties of thioxanthone (TX) and its halogenated derivatives (TX-R, R = F, Cl, Br, I), and 2-chlorothioxanthone (TX-Cl) exhibits very strong RTP with an absolute quantum yield (ΦRTP) of 74.7% as a crystal, which is outstanding in pure organic RTP materials. Experimental and theoretical investigations demonstrate that such a high-efficiency RTP of the TX-Cl crystal is attributed to the aggregate emission from one-dimensional strong π–π stacking, which significantly enhances both intersystem crossing (ISC, S1 → Tn) and phosphorescence radiative rate (T1 → S0). Moreover, a single-molecule white-light emitter (SMWLE) was harvested with the CIE coordinates of (0.31, 0.33) by precisely controlling the doping ratio of TX-Cl in a polymethyl methacrylate (PMMA) film, which consists of ternary emissions: monomer fluorescence, monomer RTP and aggregate RTP. This result provides an important prototype to explore high-efficiency RTP by supramolecular aggregation.

Graphical abstract: One-dimensional π–π stacking induces highly efficient pure organic room-temperature phosphorescence and ternary-emission single-molecule white light

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Publication details

The article was received on 19 Aug 2019, accepted on 16 Sep 2019 and first published on 18 Sep 2019


Article type: Paper
DOI: 10.1039/C9TC04580E
J. Mater. Chem. C, 2019,7, 12502-12508

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    One-dimensional π–π stacking induces highly efficient pure organic room-temperature phosphorescence and ternary-emission single-molecule white light

    Y. Wen, H. Liu, S. Zhang, Y. Gao, Y. Yan and B. Yang, J. Mater. Chem. C, 2019, 7, 12502
    DOI: 10.1039/C9TC04580E

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