Deep-red fluorescence from isolated dimers: a highly bright excimer and imaging <i>in vivo</i>

Luo, Qianxin; Lin, Li; Ma, Huili; Lv, Chunyan; Jiang, Xueyan; Gu, Xinggui; An, Zhongfu; Zou, Bo; Zhang, Cheng; Zhang, Yujian

doi:10.1039/d0sc01873b

Cited by 51 publications

(27 citation statements)

References 51 publications

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“…The synthetic method of DBCT was modified by the reported literature (Figure 1a). [22,23] More detailed synthesis and characterization of the final compound are illustrated in (Schemes S1-S3 and Figures S1-S6, Supporting Information). As shown in Figure 1b and Figure S7 (Supporting Information), the obvious color variance of DBCT powder was observed after pressing or grinding along with the fluorescence wavelength variation (Δλ = 60 nm) from orange (O-phase, λ= 586 nm) to deep red (R-phase, λ = 646 nm), which can recover to pristine color (λ = 585 nm) by heating at 120 °C for about 10 s. Especially, an obvious emission enhancement was observed in the pressure range of 1 atm-0.4 MPa and further compression induced the emission decrease (>0.4MPa).…”

Section: Piezochromic Behaviors Of Powdermentioning

confidence: 99%

High Contrast and Bright Emission Piezochromic Fluorescence in Organic Crystals via Pressure Modulated Exciton Coupling Effect

Man

et al. 2021

Advanced Optical Materials

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With its recent debut in various fields, piezochromic fluorescent (PCF) materials have attracted considerable attention due to their unique photophysical features with dynamically reversible emission wavelength and intensity. Herein, a novel luminogen DBCT is developed, which is sensitive to external pressure and displays dual color reversibly switched PCF fluorescence. The solid state emission can switch from bright orange (O) (λem = 586 nm, Φsolid = 0.47) to deep red (R) emission (λem = 646 nm, Φsolid = 0.34) with high contrast through pressing (0.6 MPa), heating and fuming processes. Single crystal X‐ray analysis and theoretical calculations verify that the reversible luminescence switching characteristic is highly related to the different molecular packing mode within O and R crystals, which amplifies the exciton coupling (EC) effect and results in good PCF performances with high Φsolid as well as distinguishable red‐shifted emission. With such multiple advantages that writable fluorescent inks are successfully fabricated with high contrast for security anti‐counterfeiting applications based on DBCT molecules. This research may offer an important guideline for molecular design of PCF materials and enrich the underlying mechanism of mechanochromic luminescence, which also broadens the real‐life applications of smart materials.

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Section: Piezochromic Behaviors Of Powdermentioning

confidence: 99%

High Contrast and Bright Emission Piezochromic Fluorescence in Organic Crystals via Pressure Modulated Exciton Coupling Effect

Man

et al. 2021

Advanced Optical Materials

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“…[50] However, it remains challenging to demonstrate the microstructures of the Janus-NFs based on the same kind of polymer matrix, which is crucial to aid in the rational design and optimization of high-performance nanofibers for high efficient WLEEs. Thanks to the sensitivity of AIEgens to aggregation microenvironment, lots of microscopic processes and microstructures for both material science [51][52] and biomedicine [53][54][55] have been monitored and visualized in situ to unveil the inherent mechanism and provide straightforward guidance. Therefore, we envision that the combination of AIE characteristics and Janus-NFs would provide a promising approach for in-situ visualization of the microscopic process and microstructures of Janus-NFs.…”

Section: Introductionmentioning

confidence: 99%

Janus‐Structural AIE Nanofiber with White Light Emission and Stimuli‐Response

Zhao

Sun

Qin

et al. 2022

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White‐light emitting elastomers (WLEEs) based on stimuli‐responsive aggregation‐induced emission (AIE) and regulated Förster resonance energy transfer (FRET) have aroused increasing attention due to the demands for wearable optoelectronic devices. Herein, the blue and orange AIEgens with different environmental sensitivities are synthesized and then encapsulated on both sides of nanofibers via side‐by‐side electrospinning aiming to achieve the Janus WLEEs. After regulating the blue‐orange AIEgens ratio, efficient and stable white light emission with a CIE coordinate of about (0.33, 0.31) is achieved at a blue‐orange AIEgens mass ratio of 3:1. Besides, the Janus nanofibers (Janus‐NFs) also present super stretchability with elongation at the break over 150% and tensile strength close to 7 MPa. The sensitivity of fluorescence for Janus‐NFs to its stretching deformation is used to visualize the evolution of the microstructure of nanofibers during stretching. Moreover, the Janus‐NFs are also sensitive to HCl and NH3, of which the fluorescence color would change under HCl and NH3 fuming above 2 and 57 ppm in air, respectively. The promising applications of the white light Janus‐NFs in smart fabrics, warning sensors, and anti‐counterfeiting packaging are demonstrated. This finding provides an efficient strategy for achieving wearable WLEEs with multiple functionalities, promoting the development of wearable devices.

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“…Despite the fact that the aggregates, especially the excimer and exciplex, that are used are believed to be of low-efficiencies, recently, our group have reported a series of highly efficient excimer fluorescent materials. [9][10][11] For example, with systematically regulated side-group substitutions, the optimized structure 2-(anthracen-9-yl) thianthrene (2-TA-AN) exhibits a green excimer emission at 526 nm with a considerably high PLQY of 80% compared with its deep-blue, but low-efficiency monomer emission (424 nm, PLQY = 33%). 12 However, the present excimer is that the molecular structure of these efficient excimers is limited to anthracene derivatives, which can only produce a green emission.…”

Section: Introductionmentioning

confidence: 99%

Deep-red electro-fluorescence based on an excimer emission with hot-exciton channels

Gao

Yao²,

Zhou

et al. 2022

J. Mater. Chem. C

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Deep-red fluorescence from isolated dimers: a highly bright excimer and imaging in vivo

Abstract: A strategy is proposed to realize high-efficiency, solid-state and NIR-emissive organic molecules based on HLCT state and separated dimeric stacks.

Cited by 51 publications

References 51 publications

High Contrast and Bright Emission Piezochromic Fluorescence in Organic Crystals via Pressure Modulated Exciton Coupling Effect

High Contrast and Bright Emission Piezochromic Fluorescence in Organic Crystals via Pressure Modulated Exciton Coupling Effect

Janus‐Structural AIE Nanofiber with White Light Emission and Stimuli‐Response

Deep-red electro-fluorescence based on an excimer emission with hot-exciton channels

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