Review on new horizons of aggregation induced emission: from design to development

Suman, G.R.; Pandey, Mayank; Chakravarthy, A. S. Jeevan

doi:10.1039/d0qm00825g

Cited by 134 publications

(14 citation statements)

References 150 publications

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“…Whereas the fluorescence property of conformationally restricted, planar, conjugated molecules has been known for many years, the aggregation-induced emission enhancement (AIEE) exhibited by conformationally flexible conjugated systems is a more recent phenomenon . TPE ( 1 ) and its substituted variants are widely used as fluorescence probes by exploiting their AIEE, which is theorized to result from a restriction in conformational freedom upon aggregation .…”

Section: Results and Discussionmentioning

confidence: 99%

“…Established conjugated systems based upon a tetrasubstituted CC core are tetraphenylethylene TPE 1 , tetravinylethylene TVE 2 , and tetraethynylethylene TEE 3 (Figure , top right). All have been shown to have useful applications: in the case of TPE, as a fluorescence-based sensor by exploiting its aggregation-induced emission enhancement (AIEE) and in OLEDs; with TVE 2 due to its ability to rapidly generate structural complexity through pericyclic reaction sequences; and with TEE 3 through contributions in the field of molecular electronics . The properties of these molecules are determined not only by the connectivity of their π-frameworks but also by their conformational behavior.…”

Section: Introductionmentioning

confidence: 99%

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Substituted Tetraethynylethylene–Tetravinylethylene Hybrids

et al. 2022

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A general synthetic approach to molecular structures that are hybrids of tetraethynylethylene (TEE) and tetravinylethylene (TVE) is reported. The synthesis permits the controlled preparation of many previously inaccessible structures, including examples with different substituents on each of the four branching arms. Most substituted TVE−TEE hybrids are found to be significantly more robust compounds than their unsubstituted counterparts, enhancing the prospects of their deployment in conducting materials and devices. Their participation in pericyclic reaction cascades, leading to sp 3 -rich polycycles, is demonstrated. The utilization of TEE−TVE hybrids as building blocks for larger acyclic, through/cross-conjugated hydrocarbon frameworks is also established. Aryl-substituted TEEs, TVEs, and their hybrids are fluorescent, with some exhibiting aggregation-induced emission enhancement. The structural requirements are defined and explained, setting the scene for applications as fluorescent probes and organic light-emitting diodes.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Substituted Tetraethynylethylene–Tetravinylethylene Hybrids

et al. 2022

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“…In the last couple of years, extensive research has been devoted to the development of exciting new generations of AIE materials. , These include, for instance, water-soluble AIE materials such as polymers or multifunctional charged AIEgen (poly)electrolytes. , It has been clearly demonstrated that due to the combination of their size, special chemistry, and chromophore characteristics, these novel materials are superior compared to the individual small AIE analogs in terms of luminescence efficiency, photostability, low background signals, high resistance to photobleaching, structural diversity, etc. A very recent hot example shown in Figure is related to the observation of the 3D reconstruction and in situ crack tracing of polydimethylsiloxane/montmorillonite nanocomposite layers.…”

Section: Discussionmentioning

confidence: 99%

Adsorption of Dye Molecules and Its Potential for the Development of Photoactive Hybrid Materials Based on Layered Silicates

et al. 2023

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The present paper gives a brief account of the latest advances in understanding of the mechanism and implications of dye adsorption with a special focus on layered silicate surfaces. It has been clearly demonstrated that the controlled adsorption of novel or already well-known dyes has equally great yet unexplored potential. In principle, the well-engineered surface confinement of the molecules may lead to their aggregation, adsorption, or intercalation-induced fluorescence emission even with conventional dyes, which are not considered as luminophores in solutions or in the solid state. We envision the utilization of silicate-based heterogeneous systems to produce novel polymer blended films or structured liquids, as well as to develop a plethora of other photophysical and biomedical applications.

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“…We believe this to be a significant advancement over the currently known examples of TADF AIE/CIE materials. 45 Furthermore, this work serves as a proofof-concept for a new simple one-step method for producing luminescent nanocrystals through use of sonication.…”

Section: Introductionmentioning

confidence: 99%

Sonocrystallization Induced Thermally Activated Delayed Fluorescence via Distortion of Molecular Geometry

Maggiore

Pander

et al. 2023

Preprint

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In this work we present three donor-acceptor thermally activated delayed fluorescence (TADF) molecules comprising a 2,3,5,6-tetrafluorobenzonitrile acceptor with various electron donor units: phenoxazine (Phx-BzN), phenothiazine (Pht-BzN), and carbazole (Cz-BzN). These molecules have been studied using steady-state and time-resolved photophysical techniques in solution, film and in crystal state. While Cz-BzN displays TADF in solution and PMMA films, Phx-BzN and Pht-BzN are non-emissive in solution and somewhat emissive in polymer films. More interestingly, while Pht-BzN remains virtually non-emissive in all studied solvents, it exhibits strong photoluminescence and TADF in crystal state, attributed to Crystallization Induced Emission (CIE). We demonstrate through computational studies that the CIE properties arise due to intermolecular interactions in the crystal structure that result in locking the ground state molecular geometry and blocking relaxation in the excited state. As a result, the oscillator strength in the crystal form is enhanced leading to a highly luminescent behaviour, while in solution it equals nearly zero due to the molecule adopting a perfectly orthogonal D-A orientation in the excited state.

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Review on new horizons of aggregation induced emission: from design to development

Abstract: An unusual behavior of some organic luminophores is known as Aggregation Induced Emission (AIE). The exposure of this concept to the scientific community significantly changes the perception towards conventionally used...

Cited by 134 publications

References 150 publications

Substituted Tetraethynylethylene–Tetravinylethylene Hybrids

Substituted Tetraethynylethylene–Tetravinylethylene Hybrids

Adsorption of Dye Molecules and Its Potential for the Development of Photoactive Hybrid Materials Based on Layered Silicates

Sonocrystallization Induced Thermally Activated Delayed Fluorescence via Distortion of Molecular Geometry

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