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Helicene-derived aggregation-induced emission conjugates with highly tunable circularly polarized luminescence

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Abstract

Chiral organic molecules play an important role in generating circularly polarized luminescence (CPL) with high quantum yield and tunable colours. However, their CPL performance is virtually limited by the small dissymmetric factor |glum| value and the aggregation-caused quenching issue in the solid state. Here, we report a series of luminescent molecules with tailored marriage of helicenes and aggregation-induced emission (AIE) luminophores. The resulting adducts are highly fluorescent in the aggregated state with colour varying from blue to green and quantum yield up to 37.0%, depending on the linkage position, conjugation and length. The efficient association of the helical conjugated skeleton of helicene and the AIE moiety also enables a relatively high |glum| value ranging from 0.001 to 0.011. Notably the |glum| value could be further enhanced to ca. 0.015 by the substitution of two AIE luminophores onto a single helicene. This work provides a practical synthetic strategy for advanced molecular CPL materials, and would also favour the fabrication of high-performance circularly polarized organic light-emitting devices.

Graphical abstract: Helicene-derived aggregation-induced emission conjugates with highly tunable circularly polarized luminescence

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Publication details

The article was received on 23 Oct 2019, accepted on 20 Nov 2019 and first published on 21 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QM00652D
Mater. Chem. Front., 2020, Advance Article

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    Helicene-derived aggregation-induced emission conjugates with highly tunable circularly polarized luminescence

    C. Shen, F. Gan, G. Zhang, Y. Ding, J. Wang, R. Wang, J. Crassous and H. Qiu, Mater. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QM00652D

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