In situ doped Cs2AgIn0.9Bi0.1Cl6:8%Yb,2%Er/PVDF composite films for the printing of multimodal fluorescent anti-counterfeiting marks

Shi, Jindou; Wang, Zeyu; Gaponenko, Nikolai V.; Da, Zheyuan; Zhang, Chen; Wang, Junnan; Ji, Yongqiang; Yao, Qing; Ding, Yusong; Wang, Minqiang; Xu, Youlong

doi:10.1016/j.mtchem.2023.101874

Cited by 4 publications

(1 citation statement)

References 47 publications

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“…1–6 Applications of these materials have extended across various domains, notably in solar cells and photodetectors. 7–12 Concurrently, the enhancement of the optical properties of lead-free DP materials through ion doping has emerged as a focal point of research, 13–15 setting a foundational platform for their integration into light-emitting diodes (LEDs). 16–19 However, a critical challenge is the high temperatures generated on optoelectronic device surfaces during extended operation, adversely affecting the optical performance of fluorescent materials, including lead-free DPs.…”

Section: Introductionmentioning

confidence: 99%

Advanced lead-free double perovskites/silica hybrid nanocrystals for highly stable light-emitting diodes

Shi,

Wang,

et al. 2024

J. Mater. Chem. C

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Section: Introductionmentioning

confidence: 99%

Advanced lead-free double perovskites/silica hybrid nanocrystals for highly stable light-emitting diodes

Shi,

Wang,

et al. 2024

J. Mater. Chem. C

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In Situ Growth of Lead‐Free Double Perovskite Micron Sheets in Polymethyl Methacrylate for X‐Ray Imaging

Shi,

Wang,

et al. 2024

Advanced Optical Materials

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Pb‐free double‐perovskite (DP) scintillators are highly promising candidates for X‐ray imaging because of their superior optoelectronic properties, low toxicity, and high stability. However, practical applications require Pb‐free DP crystals to be ground and mixed with polymers to produce scintillator films. Grinding can compromise film uniformity and optical properties, thereby affecting imaging resolution. In this study, an in situ fabrication strategy is proposed to facilitate the crystalline growth of Pb‐free Cs2AgInxBi1‐xCl6 micron sheets in polymethyl methacrylate in a single step. By adjusting the In3+/Bi3+ ratio, Cs2AgIn0.9Bi0.1Cl6/PMMA composite films (CFs) with excellent scintillation properties are obtained, including a light yield of up to 32000 photons per MeV and an X‐ray detection limit of 87 nGyairs−1. This strategy also enabled the production of large Cs2AgIn0.9Bi0.1Cl6/PMMA CFs, which demonstrated favorable flexibility and stability, fabricating products with advanced eligibility for commercial applications. The CFs exhibited outstanding performances in X‐ray imaging, producing high‐resolution structures and providing a new avenue for the development of Pb‐free DP materials in fields such as medical imaging and safety detection.

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Patterned Lead‐Free Double Perovskite/Polymer Fluorescent Piezoelectric Composite Films for Advanced Anti‐Counterfeiting

Shi,

Wang,

Jia

et al. 2024

Advanced Science

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The limitations of single fluorescent anti‐counterfeiting technologies necessitate the development of more sophisticated encryption methods to protect information and data. Traditional optical anti‐counterfeiting encryption techniques, which rely on light sources with varying wavelengths to identify information, are now insufficient to meet contemporary security demands due to their restricted response to a narrow range of wavelengths. In this study, the fabrication of patterned, lead‐free double perovskite (DP)/poly(vinylidene fluoride‐trifluoroethylene) (P(VDF‐TrFE)) fluorescent piezoelectric composite films (CFs) is reported. These CFs integrate the up‐conversion and down‐conversion photoluminescent properties of Cs2Na0.8Ag0.2BiCl6:Yb3+/Er3+ DP crystals with the piezoelectric properties of P(VDF‐TrFE) film, facilitating multi‐modal information protection. The fluorescent signals of different concealed information in CFs are observable under the excitation of 365 nm UV light and 980 nm infrared (IR) light. Additionally, external pressure applied at various locations on the CFs generates corresponding electrical signals, thereby providing triple‐layer encryption for protected information. A multifunctional anti‐counterfeiting device has been further developed by integrating patterned optical and electrical responses onto flexible CFs, achieving synergistic protection of information security in cross fields and bringing a significant advancement to the high‐level anti‐counterfeiting market.

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In situ doped Cs2AgIn0.9Bi0.1Cl6:8%Yb,2%Er/PVDF composite films for the printing of multimodal fluorescent anti-counterfeiting marks

Cited by 4 publications

References 47 publications

Advanced lead-free double perovskites/silica hybrid nanocrystals for highly stable light-emitting diodes

Advanced lead-free double perovskites/silica hybrid nanocrystals for highly stable light-emitting diodes

In Situ Growth of Lead‐Free Double Perovskite Micron Sheets in Polymethyl Methacrylate for X‐Ray Imaging

Patterned Lead‐Free Double Perovskite/Polymer Fluorescent Piezoelectric Composite Films for Advanced Anti‐Counterfeiting

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