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Photoluminescent manipulation of phenoxazine-based molecules via regulating conformational isomerization, and the corresponding electroluminescent properties

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Abstract

Multi-stimuli-responsive materials have attracted tremendous attention owing to their promising applications. Herein, we constructed two multifunctional optoelectronic materials (PXZ-DCzBN and PXZ-DtCzBN) composed of benzonitrile, phenoxazine and carbazole or tert-butyl carbazole moieties, which are endowed with thermally activated delayed fluorescence and mechanochromic luminescence characteristics. Intriguingly, under external stimuli, PXZ-DCzBN presents a unique multicolor transformation, including single-molecule white-light emission, while PXZ-DtCzBN simply displays bicolor switching. The white-light emission of PXZ-DCzBN is eventually attributed to the coexistence of two different conformers: ‘quasi-equatorial’ (eq) and ‘quasi-axial’ (ax). PXZeq-DCzBN can convert into PXZax-DCzBN via recrystallization in poor solvents. PXZeq-DCzBN generates long-wavelength emission from an intramolecular charge transfer excited state, and PXZax-DCzBN emits short-wavelength fluorescence through a locally excited transition. This study evaluates the importance of the conformational isomerization of PXZ moieties and provides an innovative perspective for understanding the relationship between molecular conformations and excited-state characteristics.

Graphical abstract: Photoluminescent manipulation of phenoxazine-based molecules via regulating conformational isomerization, and the corresponding electroluminescent properties

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Publication details

The article was received on 30 Sep 2019, accepted on 24 Oct 2019 and first published on 25 Oct 2019


Article type: Paper
DOI: 10.1039/C9TC05368A
J. Mater. Chem. C, 2019, Advance Article

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    Photoluminescent manipulation of phenoxazine-based molecules via regulating conformational isomerization, and the corresponding electroluminescent properties

    Z. Cheng, J. Liang, Z. Li, T. Yang, C. Lin, X. Mu and Y. Wang, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC05368A

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