New Wine in Old Bottles: Prolonging Room‐Temperature Phosphorescence of Crown Ethers by Supramolecular Interactions

Molecular science entails the study of structures and properties of materials at the level of single molecules or small interacting complexes of molecules. Moving beyond single molecules and well‐defined complexes, aggregates (i.e., irregular clusters of many molecules) serve as a particularly useful form of materials that often display modified or wholly new properties compared to their molecular components. Some unique structures and phenomena such as polymorphic aggregates, aggregation‐induced symmetry breaking, and cluster excitons are only identified in aggregates, as a few examples of their exotic features. Here, by virtue of the flourishing research on aggregation‐induced emission, the concept of “aggregate science” is put forward to fill the gaps between molecules and aggregates. Structures and properties on the aggregate scale are also systematically summarized. The structure–property relationships established for aggregates are expected to contribute to new materials and technological development. Ultimately, aggregate science may become an interdisciplinary research field and serves as a general platform for academic research.

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“…Such materials would have great potential for application in signal detection, information storage, etc. [255][256][257][258][259]…”

Section: Multicomponent Aggregatesmentioning

confidence: 99%

Aggregate Science: From Structures to Properties

et al. 2020

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“…Molecular organic materials with long‐persistent luminescence at room temperature have potential applications in anticounterfeiting, information storage, data encryption, and bioimaging, and have thus attracted considerable interest in the past decade . Several organic RTP materials with ultralong lifetime have been reported . Huang and An et al.…”

Section: Figurementioning

confidence: 99%

Time‐Dependent Afterglow Color in a Single‐Component Organic Molecular Crystal

Wang,

Fang,

et al. 2020

Angew Chem Int Ed

162

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An organic crystal of 4,4′‐bis(N‐carbazolyl)‐1,1′‐biphenyl (pCBP) exhibits time‐dependent afterglow color from blue to orange over 1 s. Both experimental and computational data confirm that the color evolution results from well‐separated, long‐persistent thermally activated delayed fluorescence (TADF) and room‐temperature phosphorescence (RTP) with different but comparable decay rates. TADF is enabled by a small S1–T1 energy gap of 0.7 kcal mol−1. The good separation of TADF and RTP is due to a 11.8 kcal mol−1 difference in the S0 energies of the S1 and T1 structures, indicating that apart from the excited‐state properties, tuning the ground state is also important for luminescence properties. This afterglow color evolution of pCBP allows its applications in anticounterfeiting and data encryption with high security levels.

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“…[ 2 ] Plenty of research works have been accomplished based on this knowledge. [ 9,10,74–78 ] With the rational induce selection of the macrocyclic hosts, we can not only achieve RTP with high efficiency, but also afford artificial soft materials that is highly desired today for both the superiority of polymers and the reversibility of noncovalent interactions. [ 79,80 ]…”

Section: Nondoped Polymer Systems With Rtp Emissionmentioning

confidence: 99%

Recent Advances of Polymer‐Based Pure Organic Room Temperature Phosphorescent Materials

Wang

Lou

Wang

et al. 2021

Macromol. Rapid Commun.

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Room temperature phosphorescence (RTP) has attracted broad attention due to their long lifetimes, large Stokes shift, and widespread applications. Achieving RTP emission has long been a challenging task under common conditions, for the necessary requirements of promoting intersystem crossing processes and suppressing nonradiative transitions are always tough to meet. Over the past decade, RTP has been obtained through several specific strategies, among which an important method lies in immobilizing phosphors into polymer matrices. Via the effect of steric overcrowding exerted by the polymeric structures, the phosphorescence of the initial phosphors can be promoted significantly. Hence, polymer‐based pure organic materials have proved to be one newly emerging subject in the field of RTP materials. In this review article, the progresses of polymer‐based pure organic room temperature phosphorescent materials are elaborated from four main approaches, including doped polymer systems, copolymer systems, homopolymer systems, and host–guest complexation systems, whereby the design principles, synthesis methods, possible mechanisms, and applications are summarized and discussed in detail.

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New Wine in Old Bottles: Prolonging Room‐Temperature Phosphorescence of Crown Ethers by Supramolecular Interactions

Cited by 116 publications

References 49 publications

Aggregate Science: From Structures to Properties

Aggregate Science: From Structures to Properties

Time‐Dependent Afterglow Color in a Single‐Component Organic Molecular Crystal

Recent Advances of Polymer‐Based Pure Organic Room Temperature Phosphorescent Materials

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