Self‐assembly and tunable optical properties of intramolecular charge transfer molecules

Shên, Hui; Li, Yongjun; Li, Yuliang

doi:10.1002/agt2.6

Cited by 50 publications

(18 citation statements)

References 57 publications

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“…Researchers have established many photophysical theories based on molecular science, which focus on the fluorescent mechanisms of organic fluorophores. For example, efficient fluorophores are closely correlated with large π conjugation through covalent bonds (e.g., double bond, triple bond, or aromatic ring), , and introduction of donor (D) and acceptor (A) groups into the molecular skeleton often leads to redder but weaker emission, , especially for molecules showing twisted intramolecular charge transfer effects. , In most cases, these molecular theories are capable of revealing the photophysical mechanisms of organic luminescent materials. Based on these studies at the molecular level, a paradigm of material research is gradually formed that molecular structures and properties always determine the performance of macroscopic materials.…”

Section: Introductionmentioning

confidence: 99%

How to Manipulate Through-Space Conjugation and Clusteroluminescence of Simple AIEgens with Isolated Phenyl Rings

Zhang

et al. 2021

J. Am. Chem. Soc.

124

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Apart from the traditional through-bond conjugation (TBC), through-space conjugation (TSC) is gradually proved as another important interaction in photophysical processes, especially for the recent observation of clusteroluminescence from nonconjugated molecules. However, unlike TBC in conjugated chromophores, it is still challenging to manipulate TSC and clusteroluminescence. Herein, simple and nonconjugated triphenylmethane (TPM) and its derivatives with electron-donating and electron-withdrawing groups were synthesized, and their photophysical properties were systematically studied. TPM was characterized with visible clusteroluminescence due to the intramolecular TSC. Experimental and theoretical results showed that the introduction of electron-donating groups into TPM could red-shift the wavelength and increase the efficiency of clusteroluminescence simultaneously, due to the increased electronic density and stabilization of TSC. However, TPM derivatives with electron-withdrawing groups showed inefficient or even quenched clusteroluminescence caused by the vigorous excited-state intramolecular motion and intermolecular photoinduced electron transfer process. This work provides a reliable strategy to manipulate TSC and clusteroluminescence.

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Section: Introductionmentioning

confidence: 99%

How to Manipulate Through-Space Conjugation and Clusteroluminescence of Simple AIEgens with Isolated Phenyl Rings

Zhang

et al. 2021

J. Am. Chem. Soc.

124

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“…[8,26,[40][41][42][43][44][45] The optimization of the NLO response of organic materials usually involves the introduction of electron donating and accepting groups into a π-conjugated molecule. [19,[46][47][48] By chemically optimizing the electronic structures of the electron donors (D) and acceptors (A) as well as the π-bridges, intramolecular charge transfer (ICT) processes within these D-π-A molecules are facilitated and consequently, their NLO hyperpolarizabilities are boosted. [49,50] However, such an optimization of the molecular hyperpolarizabilities does not always lead to materials with high macroscopic NLO susceptibilities, because such D-π-A molecules have a strong tendency to self-organize in centrosymmetric ways, driven by dipole-dipole interactions.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Optical Properties and Applications of Fluorenone Molecular Materials

Semin

Duan

et al. 2021

Advanced Optical Materials

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Fluorenone molecular materials provide an excellent platform to engineer new materials that are very promising for photonic and optoelectronic applications, such as very efficient optical second harmonic (SHG) and terahertz (THz) generation, light emitting diodes, biomarkers, solar cells, and sensors. More recently, there have been a lot of research efforts dedicated towards the nonlinear optical (NLO) properties of these fluorenone materials because of their unique combination of chemical, structural, and optical properties. This review addresses the state of the art of this very interesting and potent class of molecular materials. In particular, the NLO susceptibilities, their potential for optical SHG and THz generation and their two‐photon luminescence properties and how to optimize these by rational design are reviewed. Flexibility and easiness of modification of their molecular properties combined with their structural polymorphism enable a variety of applications. Perspectives and future research directions for these fluorenone materials are also presented.

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“…Further increasing the strength of the electron-donating and electron-withdrawing abilities between a D-A pair, the emission from the CT state becomes dominant without any LE feature. 52,53 Specifically, polychromic emission from CT states may be observed if two or more different D-A pairs are presented. Chi et al reported an asymmetrical compound CPzPO based on diphenylsulfone, diphenylketone, and diphenylphosphine oxide, which showed a donor-acceptor-acceptor conformation [Fig.…”

Section: Dual Fluorescence From Two Statesmentioning

confidence: 99%

White-light emission from organic aggregates: a review

et al. 2021

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White light, which contains polychromic visible components, affects the rhythm of organisms and has the potential for advanced applications of lighting, display, and communication. Compared with traditional incandescent bulbs and inorganic diodes, pure organic materials are superior in terms of better compatibility, flexibility, structural diversity, and environmental friendliness. In the past few years, polychromic emission has been obtained based on organic aggregates, which provides a platform to achieve white-light emission. Several white-light emitters are sporadically reported, but the underlying mechanistic picture is still not fully established. Based on these considerations, we will focus on the single-component and multicomponent strategies to achieve efficient white-light emission from pure organic aggregates. Thereinto, single-component strategy is introduced from four parts: dual fluorescence, fluorescence and phosphorescence, dual phosphorescence with anti-Kasha's behavior, and clusteroluminescence. Meanwhile, doping, supramolecular assembly, and cocrystallization are summarized as strategies for multicomponent systems. Beyond the construction strategies of white-light emitters, their advanced representative applications, such as organic light-emitting diodes, white luminescent dyes, circularly polarized luminescence, and encryption, are also prospected. It is expected that this review will draw a comprehensive picture of white-light emission from organic aggregates as well as their emerging applications.

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Self‐assembly and tunable optical properties of intramolecular charge transfer molecules

Cited by 50 publications

References 57 publications

How to Manipulate Through-Space Conjugation and Clusteroluminescence of Simple AIEgens with Isolated Phenyl Rings

How to Manipulate Through-Space Conjugation and Clusteroluminescence of Simple AIEgens with Isolated Phenyl Rings

Nonlinear Optical Properties and Applications of Fluorenone Molecular Materials

White-light emission from organic aggregates: a review

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