Colour-tunable dual-mode afterglows and helical-array-induced mechanoluminescence from AIE enantiomers: Effects of molecular arrangement on formation and decay of excited states

Li, Jianan; Song, Zicun; Chen, Yitong; Xu, Chao; Li, Shufeng; Peng, Qiaoer; Shi, Guang; Liu, Cong; Luo, Suilian; Sun, Fengqiang; Zhao, Zujin; Chi, Zhenguo; Zhang, Yi; Xu, Bingjia

doi:10.1016/j.cej.2021.129167

Cited by 64 publications

(24 citation statements)

References 52 publications

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“…[4][5][6] Under the guidance of these design strategies, lots of chiral organic luminogens with unique luminescence properties such as thermally activated delayed uorescence (TADF), roomtemperature phosphorescence, and aerglow have been sequentially developed in the last few years. 2,4,[7][8][9][10][11][12][13][14] Despite these signicant achievements, research on the differences in photophysical properties between chiral molecules and their racemate remains very limited. 15,16 In principle, an emissive racemate and its enantiomers have identical chromophores.…”

Section: Introductionmentioning

confidence: 99%

Controlling the thermally activated delayed fluorescence of axially chiral organic emitters and their racemate for information encryption

Song

Zhang

et al. 2021

Chem. Sci.

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Section: Introductionmentioning

confidence: 99%

Controlling the thermally activated delayed fluorescence of axially chiral organic emitters and their racemate for information encryption

Song

Zhang

et al. 2021

Chem. Sci.

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“…Li and co-workers synthesize a series of long lifetime boron-containing RTP materials, which are suitable for information anticounterfeiting . On the basis of previous research, prolonging the phosphorescence lifetime is still the focus of researchers. , To accomplish this objective, promoting intersystem crossing (ISC) of singlet–triplet transitions is one of the important factors, , which relies on efficient spin–orbit coupling (SOC) that is facilitated by introducing heteroatoms (N, S, P, O, etc.) with lone pair electrons. − …”

mentioning

confidence: 99%

Transient Absorption Spectroscopy of a Carbazole-Based Room-Temperature Phosphorescent Molecule: Real-Time Monitoring of Singlet–Triplet Transitions

Yang

Jiang

Liu

et al. 2022

J. Phys. Chem. Lett.

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Real-time monitoring of singlet–triplet transitions is an effective tool for studying room-temperature phosphorescent molecules. For femtosecond transient absorption (TA) spectroscopy of a 2,6-di(9H-carbazol-9-yl) pyridine molecule in dimethyl sulfoxide (DMSO), the stimulated emission signal (380 nm) and the excited-state absorption signal (650 nm) reach their maximum intensity within 397 fs. Subsequently, the two signals decay with time and the triplet–triplet absorption (TTA) signal (400 nm) is enhanced synchronously, accompanied by an isosbestic point at 491 nm. These results confirm intersystem crossing (ISC) within 2.5 ns. Moreover, the TTA signal (400 nm) in nanosecond TA spectroscopy gradually disappeared, accompanied by a phosphorescence lifetime of 4.1 μs. As the solvent polarity decreases (DMSO > N,N-dimethylformamide > 1,4-dioxane > toluene), similar spectral dynamic processes are observed, while the durations of ISC processes and phosphorescence lifetimes are shortened. This combined femtosecond and nanosecond transient absorption spectroscopy study presents the ultrafast excited-state dynamics of organic phosphorescent molecules.

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“…Very recently, luminescent materials with tunable photoluminescence (PL) and/or RTP have attracted much attention because they provide significant information of the excitons at the aggregate level and supply emerging applications in advanced data encryption, anticounterfeiting, UV detection [16][17][18][19][20][21][22][23][24][25][26], etc. For example, Huang and An et al obtained dual phosphorescent emission from monomers and H-aggregates of triazine derivatives with excitationdependent color-tunable p-RTP, which renders them applicable in UV detection [18].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Huang and An et al obtained dual phosphorescent emission from monomers and H-aggregates of triazine derivatives with excitation-dependent color-tunable p-RTP, which renders them applicable in UV detection [ 18 ]. Currently, the PL color tunability is mostly achieved by modifying the molecular structures [ 27 ], achieving polymorphs [ 23 , 28 ], changing the temperature or the excitation wavelength ( λ ex ) [ 18 , 22 , 29 , 30 ], and so on [ 31 – 33 ]. Organics with time-dependent color-tunable afterglow, however, are rarely reported [ 14 , 34 ], especially for single-component materials.…”

Section: Introductionmentioning

confidence: 99%

Time-Dependent Afterglow from a Single Component Organic Luminogen

et al. 2021

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Pure organic luminogens with long-persistent luminescence have been extensively studied, on account of their fundamental research significance and diverse utilizations in anticounterfeiting, bioimaging, encryption, organic light-emitting diodes, chemo-sensing, etc. However, time-dependent color-tunable afterglow is rarely reported, especially for single-component materials. In this work, we reported an organic luminogen with time-dependent afterglow, namely, benzoyleneurea (BEU), with multiple persistent room-temperature phosphorescence (p-RTP) and thermally activated delayed fluorescence (TADF) in single crystals. While the lifetime of TADF is relatively short (~1.2 ms), those for p-RTP are as long as around 369~754 ms. The comparable but different decay rates of diversified p-RTP emissions endow BEU crystals with obvious time-dependent afterglow. The existence of multiple emissions can be reasonably illustrated by the clustering-triggered emission (CTE) mechanism. Single-crystal structure illustrates that the combination of benzene ring and nonconventional chromophores of ureide helps facilitate divergent intermolecular interactions, which contribute to the formation of varying emissive species. Moreover, its methyl- and chloro-substituted derivatives show similar multiple p-RTP emissions. However, no time-dependent afterglows are observed in their crystals, due to the highly approaching lifetimes. The afterglow color variation of BEU crystals grants its applications in advanced anticounterfeiting field and information encryption.

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Colour-tunable dual-mode afterglows and helical-array-induced mechanoluminescence from AIE enantiomers: Effects of molecular arrangement on formation and decay of excited states

Cited by 64 publications

References 52 publications

Controlling the thermally activated delayed fluorescence of axially chiral organic emitters and their racemate for information encryption

Controlling the thermally activated delayed fluorescence of axially chiral organic emitters and their racemate for information encryption

Transient Absorption Spectroscopy of a Carbazole-Based Room-Temperature Phosphorescent Molecule: Real-Time Monitoring of Singlet–Triplet Transitions

Time-Dependent Afterglow from a Single Component Organic Luminogen

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