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Pyrene-based aggregation-induced emission luminogens and their applications

Islam, Md. Monarul; Hu, Zhen; Wang, Qingsong; Redshaw, Carl; Feng, Xing

Authors

Md. Monarul Islam

Zhen Hu

Qingsong Wang

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Xing Feng

Abstract

"Unity is force"-Aesop. It is a common phenomenon that traditional chromophores exhibit high fluorescence in dilute solution yet luminescence is quenched at high concentrations or in the aggregate state, ie “aggregation-caused quenching” (ACQ). Tang reported the unusual photophysical observation that luminogens can exhibit weak or no fluorescence in solution yet are highly emissive in the aggregate or solid state, which is defined as aggregation-induced emission (AIE).This discovery of AIE helped solve the ACQ effect in traditional luminophores. Pyrene is an important polycyclic aromatic hydrocarbon (PAH), which exhibits very different photophysical behaviour in solution versus the aggregate state, and the ACQ effect has played a dominant role in pyrene chemistry. The ACQ effect is harmful to some practical applications and is a challenge in organic light-emitting diodes (OLEDs) and light-emitting electrochemical cells for which the effect is more severe in the solid state. Thus, how to overcome the ACQ effect observed in pyrene chemistry still remains a challenge. In this review, we discuss how following the basic AIE mechanism, such as the restriction of intramolecular rotations/motion/vibrations (RIR/RIM/RIV), excited state intramolecular proton transfer (ESIPT), twisted intramolecular charge transfer (TICT), can transform pyrene-based ACQ luminogens to AIE luminogens with excellent optical properties. Furthermore, prospective applications of pyrene-based AIEgens are discussed as is the potential for designing new organic functional materials.

Journal Article Type Article
Publication Date Mar 20, 2019
Journal Materials Chemistry Frontiers
Print ISSN 2052-1537
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Institution Citation Islam, M. M., Hu, Z., Wang, Q., Redshaw, C., & Feng, X. (2019). Pyrene-based aggregation-induced emission luminogens and their applications. Materials Chemistry Frontiers, https://doi.org/10.1039/c9qm00090a
DOI https://doi.org/10.1039/c9qm00090a
Publisher URL https://pubs.rsc.org/en/Content/ArticleLanding/2019/QM/C9QM00090A#!divAbstract