2022
DOI: 10.31635/ccschem.021.202000731
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Thermally Activated Delayed Fluorescence of Aggregates Induced by Strong π–π Interactions and Reversible Dual-Responsive Luminescence Switching

Abstract: A reversible dual-responsive luminescent material was introduced by our group to show the simultaneous color and lifetime switching in response to external stimuli. Pristine crystalline powder of (E)-2-(benzo[d]thiazol-2-yl)-3-(pyren-1-yl)acrylonitrile (Py-BZTCN) shows the ordered π-π stacking with only near-monomer-normal orange-yellow fluorescence, but it exhibits red emission with thermally activated delayed fluorescence (TADF) after grinding, which can be reversibly recovered by heating or fuming treatment… Show more

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Cited by 41 publications
(16 citation statements)
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References 95 publications
(111 reference statements)
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“…It is known that the interplanar distance and overlap are two important factors to evaluate the intermolecular π–π interaction, and small distance and large overlap are conducive to strengthening the π–π interaction. 5 a ,10 In previous studies, there was hardly one Py-based dimer with such a large overlap and such a close interplanar distance simultaneously, which means that the stronger intermolecular π–π interaction may exist in the Py-based π–π dimer in this study. 7 d…”
mentioning
confidence: 67%
“…It is known that the interplanar distance and overlap are two important factors to evaluate the intermolecular π–π interaction, and small distance and large overlap are conducive to strengthening the π–π interaction. 5 a ,10 In previous studies, there was hardly one Py-based dimer with such a large overlap and such a close interplanar distance simultaneously, which means that the stronger intermolecular π–π interaction may exist in the Py-based π–π dimer in this study. 7 d…”
mentioning
confidence: 67%
“…And it showed green fluorescence with a λ max at 500 nm (Figure S8, Supporting Information). [ 27 ] The second crystal (Crystal‐A) was obtained via solvent volatilization from concentrated chloroform (CHCl 3 ) or deuterated chloroform (CDCl 3 ) solution and then could turn to the third crystal (Crystal‐B) once Crystal‐A was taken out of the solution. The transformation from Crystal‐A to Crystal‐B was accompanied by a morphological change from transparent to cloudy as well as an emission color change from yellow to bluish‐green (Figure S9, Supporting Information).…”
Section: Resultsmentioning
confidence: 99%
“…13 Recently, Wang and co-workers reported a novel MCL-active TADF material based on the change of packing arrangements. 14 However, despite these advancements, research on efficient TADF with pressure-induced emission enhancement (PIEE) and multicolor MCL materials remains in its infancy due to the lack of systematic molecular design.…”
Section: Introductionmentioning
confidence: 99%