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Two‐Component Aggregation‐Induced Emission Materials: Tunable One/Two‐Photon Luminescence and Stimuli‐Responsive Switches by Co‐Crystal Formation
Author(s) -
Li Shuzhen,
Yan Dongpeng
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800445
Subject(s) - materials science , aggregation induced emission , luminescence , photoluminescence , intermolecular force , fluorescence , cyan , photochemistry , chemical physics , molecule , optoelectronics , chemistry , optics , organic chemistry , physics
Molecular materials with aggregation‐induced emission (AIE), which have been paid much attention recently, are important for applications in optoelectronic devices, chemical sensors, and biomedical probes. To date, single‐component AIE systems are largely developed; however, the knowledge on the aggregation emission properties for multicomponent systems is still rather limited. In this work, it is shown that the AIE can be further extended to two‐component molecular assemblies, with the (naphthylvinyl)pyridine (NP) as the model. The NP‐based two‐component solutions present typical AIE properties, and their aggregation/crystalline states (co‐crystals) further exhibit different fluorescence emission (blue/cyan/green) with variable photoluminescence quantum yields as high as 50.4%. The co‐crystals present adjustable two‐photon fluorescence emission that is absent for the pristine NP solid. Moreover, NP‐based co‐crystals represent smart luminescent switches with reversible changes upon external stimuli (such as heat and base vapor), and the fluorescence visualization can be easily monitored benefitting from their high‐efficiency photoemission and obvious color change. It can be expected that by virtue of facile design of intermolecular interactions (such as halogen/hydrogen bonds and π–π interactions) during co‐aggregation and/or co‐crystallization, the two‐component AIE materials can be readily extended to other fluorphore systems toward tuning high‐efficiency solid‐state emission, two‐photon luminescence, and stimuli‐responsive switching.