Binary temporary photo-response of ZnSe:Mn/ZnS quantum dots for visible time-domain anti-counterfeiting

Wang, Jiancheng; Zhou, Beiying; Ma, Jiaxin; Jin, Meizhen; Wang, Bijia; Jiang, Wan

doi:10.1039/d2nr00946c

Cited by 3 publications

(1 citation statement)

References 52 publications

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“…The luminescent materials used as fluorescent safety inks include organic dyes, − semiconductor quantum dots, rare earth doped upconversion luminescence nanomaterials, and more. Compared with the first two types, , the latter − have been preferred in anticounterfeiting applications due to their large anti-stokes displacement, stable luminescence performance, high quantum efficiency, and easy regulation of luminescence color. , For example, Xu et al prepared NaYF 4 :Ln 3+ upconversion hollow microtubules with different color output by adjusting the doping ratio of rare earth ions . Consequently, these tunable luminescent materials used as light-emitting ink were printed on various substrates by a screen for anticounterfeiting.…”

Section: Introductionmentioning

confidence: 99%

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF₄Yb³⁺,Er³⁺@Carbon Dots Chiral Fluorescent Cellulose Film

Dong

Zhao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Advanced fluorescent anticounterfeiting technology has attracted a great deal of attention and inspired researchers to develop reliable fluorescent materials with multimodal luminescence. Herein, hydrophobic NaGdF4:Yb3+,Er3+ nanoparticles with dual-mode luminescence were prepared through a one-step solvothermal method using oleic acid as a chelating agent and octadecene as a solvent. The as-synthesized sample was found to provide both green upconversion luminescence and blue downconversion luminescence at excitation wavelengths of 365 and 980 nm. The structure and composition analysis showed that the as-obtained samples were spherical NaGdF4:Yb3+,Er3+@carbon dots (CDs) with a 14.5 ± 0.2 nm particle size and good dispersity in nonpolar solvents. Subsequently, NaGdF4:Yb3+,Er3+@CDs were coated on a cholesteric nanocellulose film with structural color to prepare multimode circularly polarized fluorescent materials. The prepared composite film is flexible and water-resistant, meaning that it is very suitable for anticounterfeiting labels, not only providing a simple and rapid synthesis method with which to prepare multimode fluorescent materials but also presenting a novel anticounterfeiting technology.

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Section: Introductionmentioning

confidence: 99%

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF₄Yb³⁺,Er³⁺@Carbon Dots Chiral Fluorescent Cellulose Film

Dong

Zhao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Triply Hiding Optical Information via Excitation‐Dependent Allochroic Photoluminescence Based on Cellulose Derivates

Shi

Zhao

Zhang

et al. 2022

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Optical encryption technologies are widely used in information security, whereas the technology with one single optical secret key can be easily cracked. Here, a triple encryption is reported, which hides patterned information in excitation‐dependent allochroic materials with long afterglow, enhancing the security level. The allochroic materials are based on a uniaxial co‐assembly structure of cellulose nanocrystals (CNCs) and silica. The assembled CNCs present blue emission with quantum yield of 19.8% under 367 nm UV radiation. The blue emission is maintained in the inverse structure when CNCs are calcinated and converted to carbon dots (CDs). The inverse uniaxial‐assembly structure improves the CD emission by 6.7 times. The assembly structure can even improve the phosphorescence of CDs, leading to excellent excitation‐dependent allochroic properties. Specifically, the materials maintain a cyan long afterglow luminescence at 480 nm after removing 365 nm UV light, whose lifetime is 0.492 s. Changing the excitation wavelength to 254 nm, a UV emission at 343 nm can be obtained, alongside a blue long afterglow luminescence of 420 nm, whose lifetime is 1.574 s. Combining with blue afterglow materials, optical encryption labels are prepared, which hide different patterned information in three scenarios: natural light, UV light, and afterglow luminescence.

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High strength and transparent polyvinyl alcohol/nanocellulose film with encoding fluorescence properties

Zhang,

Xi,

Chu

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Binary temporary photo-response of ZnSe:Mn/ZnS quantum dots for visible time-domain anti-counterfeiting

Abstract: The development of multi-level anti-counterfeiting techniques is of great significance to economics and security issues, especially the newly emerged temporal-domain techniques based on lifetime coding. However, intricate reading methods required...

Cited by 3 publications

References 52 publications

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF₄Yb³⁺,Er³⁺@Carbon Dots Chiral Fluorescent Cellulose Film

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF₄Yb³⁺,Er³⁺@Carbon Dots Chiral Fluorescent Cellulose Film

Triply Hiding Optical Information via Excitation‐Dependent Allochroic Photoluminescence Based on Cellulose Derivates

High strength and transparent polyvinyl alcohol/nanocellulose film with encoding fluorescence properties

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Binary temporary photo-response of ZnSe:Mn/ZnS quantum dots for visible time-domain anti-counterfeiting

Abstract: The development of multi-level anti-counterfeiting techniques is of great significance to economics and security issues, especially the newly emerged temporal-domain techniques based on lifetime coding. However, intricate reading methods required...

Cited by 3 publications

References 52 publications

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF4Yb3+,Er3+@Carbon Dots Chiral Fluorescent Cellulose Film

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF4Yb3+,Er3+@Carbon Dots Chiral Fluorescent Cellulose Film

Triply Hiding Optical Information via Excitation‐Dependent Allochroic Photoluminescence Based on Cellulose Derivates

High strength and transparent polyvinyl alcohol/nanocellulose film with encoding fluorescence properties

Contact Info

Product

Resources

About

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF₄Yb³⁺,Er³⁺@Carbon Dots Chiral Fluorescent Cellulose Film

Multimode Anticounterfeiting Labels Based on a Flexible and Water-Resistant NaGdF₄Yb³⁺,Er³⁺@Carbon Dots Chiral Fluorescent Cellulose Film