Highly Luminescent Inks: Aggregation‐Induced Emission of Copper–Iodine Hybrid Clusters

Chen, Chen; Li, Ruihan; Zhu, Bai‐Sheng; Wang, Kunhua; Yao, Ji‐Song; Yin, Yi‐Chen; Yao, Mingming; Yao, Hong‐Bin; Yu, Shu‐Hong

doi:10.1002/anie.201802932

Cited by 97 publications

(77 citation statements)

References 28 publications

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“…Furthermore, the axisymmetric heterocycles shown in Supplementary Fig. 2 suffer from the restriction of intramolecular rotation (RIR) of symmetrical heterocycles about their disulfide bonds axes, like other reported symmetrical molecules with AIE 17,18,50 , resulting in red AIE 15,16,51 .…”

Section: Resultsmentioning

confidence: 69%

Hydrophobic carbon dots with blue dispersed emission and red aggregation-induced emission

et al. 2019

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Carbon dots (CDs) have been studied for years as one of the most promising fluorescent nanomaterials. However, CDs with red or solid-state fluorescence are rarely reported. Herein, through a one-pot solvothermal treatment, hydrophobic CDs (H-CDs) with blue dispersed emission and red aggregation-induced emission are obtained. When water is introduced, the hydrophobic interaction leads to aggregation of the H-CDs. The formation of H-CD clusters induces the turning off of the blue emission, as the carbonized cores suffer from π-π stacking interactions, and the turning on of the red fluorescence, due to restriction of the surfaces’ intramolecular rotation around disulfide bonds, which conforms to the aggregation-induced-emission phenomenon. This on-off fluorescence of the H-CDs is reversible when the H-CD powder is completely dissolved. Moreover, the H-CD solution dispersed in filter paper is nearly colorless. Finally, we develop a reversible two switch-mode luminescence ink for advanced anti-counterfeiting and dual-encryption.

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Section: Resultsmentioning

confidence: 69%

Hydrophobic carbon dots with blue dispersed emission and red aggregation-induced emission

et al. 2019

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“…In this context and regarding their mechanochromic properties, it appeared to be interesting to precisely evaluate the AIE properties of molecular [Cu 4 I 4 L 4 ] clusters. Notably, luminescent aggregates of copper iodide clusters obtained through the microemulsion method have been reported very recently and AIE properties were observed, but not thoroughly investigated . Also, the AIE properties of copper complexes, as well as copper, gold, and platinum nanoclusters have also been studied; thus demonstrating the potential of these AIE‐active metal‐based compounds.…”

Section: Introductionmentioning

confidence: 99%

Aggregation‐Induced Emission Properties of Copper Iodide Clusters

Utrera-Melero

Mevellec

Gautier

et al. 2019

Chemistry An Asian Journal

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The aggregation‐induced emission (AIE) properties of two different copper iodide clusters have been studied. These two [Cu4I4L4] clusters differ by their coordinated phosphine ligand and the luminescent mechanochromic properties are only displayed by one of them. The two clusters are AIE‐active luminophors that exhibit an intense emission in the visible region upon aggregation. The formed particles present luminescent thermochromism comparable to that of the bulk compounds. The observed AIE properties can be attributed to suppression of nonradiative relaxation of the excited states in a more rigid state, in relation to the large structural relaxation of the excited triplet state. The differences observed in the AIE properties of the two clusters can be related to the different ligands. A correlation between the luminescence mechanochromic properties and the AIE effect is not straightforward, but the formation of “soft” molecular solids is a common characteristic that can explain the photoactive properties of these compounds.

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“…Similar to many traditional luminescent nanomaterials, as‐prepared CdS:Ag QDs and their cation exchange synthesis mechanism have advantages to anticounterfeiting applications . Figure a illustrates the bulk‐sized printed pattern of “BIT” by prepared CdS:Ag QDs ink on a commercial available parchment paper under ambient (top) and UV light (bottom).…”

Section: Resultsmentioning

confidence: 99%

Hydrophilic Doped Quantum Dots “Ink” and Their Inkjet‐Printed Patterns for Dual Mode Anticounterfeiting by Reversible Cation Exchange Mechanism

Huang

et al. 2019

Adv Funct Materials

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Luminescent quantum dots (QDs) patterns have attracted great attention in anticounterfeiting applications because they can emit fluorescence upon excitation. Here, different from traditional luminescent patterns for anticounterfeiting purposes, a novel strategy based on the reversible cation exchange enabled Ag doped CdS quantum dots (CdS:Ag QDs) is reported to provide a higher security for anticounterfeiting. First, the reversibility of cation exchange enabled doped QDs crystal engineering have been revealed. The switch from nonluminescence to luminescence for several cycles by such a mechanism has been achieved. Second, the hydrophilic doped QDs "ink" can be prepared by surface modification, and then flexible bulk-sized patterns can be printed on different substrates by inkjet printing technology, such as the parchment paper, PET foil, and paper currency substrates. Third, owing to the characteristic of stable crystal structure of CdS:Ag QDs, the patterns of such doped QDs on substrates can be switched by in situ cation exchange to achieve conversion of the disappearance and recovery of luminescent signals, from which a multiple dual mode anticounterfeiting verification can be provided.

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Highly Luminescent Inks: Aggregation‐Induced Emission of Copper–Iodine Hybrid Clusters

Cited by 97 publications

References 28 publications

Hydrophobic carbon dots with blue dispersed emission and red aggregation-induced emission

Hydrophobic carbon dots with blue dispersed emission and red aggregation-induced emission

Aggregation‐Induced Emission Properties of Copper Iodide Clusters

Hydrophilic Doped Quantum Dots “Ink” and Their Inkjet‐Printed Patterns for Dual Mode Anticounterfeiting by Reversible Cation Exchange Mechanism

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