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Multicolor Photoluminescence Including White-Light Emission by a Single Host-Guest Complex
KTH, School of Biotechnology (BIO), Theoretical Chemistry and Biology.ORCID iD: 0000-0001-6508-8355
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2016 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 138, no 41, 13541-13550 p.Article in journal (Refereed) Published
Abstract [en]

Achieving multicolor photoluminescence, 'especially white-light emission, under mild conditions based on a single "fluorescent compound-is a great challenge. Herein, we report a novel colorful-emission host guest complex BPCY, which is composed of a two-arm fluorescent guest molecule (BPC) and gamma-cyclodextrin (gamma-CD) as the host-molecule. BPC bears a unique asymmetrical donor acceptor donor (D-1-A(+)similar to D-2)-type structure, where D-1, A(+), and D-2 stand for the binaphthol electron donor, pyridinium electron acceptor, and coumarin electron donor, respectively. The luminescence property of BPC shows dual-sensitivity, i.e., toward the excitation wavelength and the cyclodextrin host molecule. Under certain conditions, the complex shows three different emission wavelengths, allowing the realization of multicolor photoluminescence, including red (R), green (G), and blue (B) as well as various intermediate colors by orthogonally modulating these two stimuli. In this way, nearly pure white-light emission with CIE coordinates (0.33, 0.34) could be generated. A combination of structural, spectroscopic, and computational simulation studies revealed the occurrence of synergetic mechanistic processes for the stimuli-responsive multicolor luminescence of the BPCY complex, namely, host-enhanced intramolecular charge-transfer (ICT) and host-induced restriction of intramolecular rotation (RIR). This new supramolecular complex with superior multicolor emission abilities may find wide applications in the fields of information processing and display media. Furthermore, the molecular design rationale presented here may provide a new design strategy for the development of high performance optical materials using a single supramolecular platform.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 138, no 41, 13541-13550 p.
Keyword [en]
Charge transfer, Cyclodextrins, Fluorescence, Light, Light emission, Luminescence, Molecules, Supramolecular chemistry, Computational simulation, Fluorescent compounds, Fluorescent guest molecules, Intramolecular charge transfers, Luminescence properties, Multi-color emissions, Multicolor luminescences, Supramolecular complexes
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URN: urn:nbn:se:kth:diva-196605DOI: 10.1021/jacs.6b04776ISI: 000385992100022ScopusID: 2-s2.0-84992146427OAI: diva2:1047619
EU, European Research Council, ALPROS-290886Swedish National Infrastructure for Computing (SNIC), SNIC 2015/16-10

QC 20161118

Available from: 2016-11-18 Created: 2016-11-17 Last updated: 2016-11-18Bibliographically approved

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Li, XinÅgren, Hans
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