Manganese-doped zinc germanate phosphors with vivid luminescent properties for anti-counterfeit applications

Yang, Zishen; Spencer, Levi D.; Patocka, Delaney R.; Putta, Anjaneyulu; Schnetzer, Erin E.; Kellar, Jon; Jiang, Chaoyang

doi:10.1016/j.optmat.2023.114036

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…Numerous studies have focused on utilizing germanate as a host material that contains various dopants to create phosphor materials with exceptional luminescent properties. For example, germanate material Zn 2 GeO 4 (ZGO) has been intensively studied in the last few decades, − and ZGO-based phosphor materials have been utilized in anticounterfeiting labels with excellent outcomes. − Other germanate materials could also be good candidates for anticounterfeiting applications. One such material is CaZnGe 2 O 6 [calcium zinc germanate (CZGO)], which is a clinopyroxene material utilized in long persistent luminescence phosphors. − The dopants used in CZGO clinopyroxene include chromium (Cr); , manganese (Mn); , bismuth (Bi); , dysprosium (Dy); terbium (Tb), and lead (Pb) .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Luminescence of Lead-Doped Calcium Zinc Germanate Clinopyroxene for Multimode Anticounterfeiting

Yang,

Spencer,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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Anticounterfeiting plays an essential role in authenticating genuine documents and combating forged products. To further advance the anticounterfeiting technology, there is a strong demand to design new functional materials with unique properties that will be appropriate for making multimode complex security labels. Recently, dynamic security labels have emerged as a new type of advanced anticounterfeiting method as they can hold a much higher security level than the traditional static ones. In this work, we report that calcium zinc germanate (CZGO) clinopyroxenes doped with lead ions have several interesting optical properties, such as dynamic fluorescence, long persistent luminescence, and photochromism. We find that the concentration of lead dopants can significantly impact the reaction kinetics as well as the crystallinity and luminescence properties of CZGO phosphors. By fully utilizing these unique properties, we have successfully fabricated several security labels with multilevel information encoding and dynamic optical performance. The combination of multimode and dynamic luminescence makes these labels extremely challenging to illegally duplicate. With further optimization, this lead-doped CZGO clinopyroxene can be well-integrated into modern anticounterfeiting techniques that will generate highly secure anticounterfeiting labels to combat fake products.

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Section: Introductionmentioning

confidence: 99%

Dynamic Luminescence of Lead-Doped Calcium Zinc Germanate Clinopyroxene for Multimode Anticounterfeiting

Yang,

Spencer,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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“…Furthermore, nanophosphors exhibit long-term stability and durability, ensuring that the authentication features remain effective over extended periods. 2,3 Nanophosphors are produced through the process of substitutional doping, where rare-Earth ions (known as activators) are incorporated into a host matrix. The choice of host matrix and dopant ion is crucial for achieving the desired fluorescent properties in the nanophosphors.…”

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confidence: 99%

Structural and Spectroscopic Analysis of Reddish-Orange Emitting (Y_1−x)₂WO₆:xEu³⁺ (0 ≤ x ≤ 0.11) Nanophosphors for Anti-Counterfeiting Application

Gupt,

H. B.,

Nunez

et al. 2024

ECS J. Solid State Sci. Technol.

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Exploring luminescent materials that meet the necessary specifications for anti-counterfeiting applications has been the focus of extensive research. In this study, we delve into a double perovskite-structured material, (Y1-x)2WO6:xEu3+ (0≤x≤0.11), synthesized via a chemical combustion method. The crystallographic studies using the X-ray diffraction pattern confirm the crystallization of the nanophosphors into the monoclinic phase with a P2/c space group. The Raman and Fourier transform infrared spectroscopy studies provide insights into the nature of chemical bonding within the material. UV visible spectra are analysed to determine the optical energy gap. Notably, the photoluminescence emission spectra of the Eu3+ incorporated phosphors exhibit a distinct emission peak at 609nm, corresponding to the 5D0→7F2 electric dipole transition of the Eu3+ ions. The optimal photoluminescence intensity is observed for the x=0.07 nanophosphor, with estimated chroma coordinates of (0.500, 0.316), placing it in the reddish-orange region of the chromaticity diagram. The incorporation of Eu3+ enhances magnetization, attributed to the presence of Eu3+ ions in the 7F2 state. The luminance stability is a critical factor for long-term performance, the x=0.07 phosphor was analysed under rigorous physical and chemical testing and is found to be stable, making it a favourable candidate as a luminescence pigment for anti-counterfeiting applications.

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UV excited thermoluminescence and kinetic analysis of CaZrO3:xCe3+ phosphors synthesized by sol–gel combustion method

Jafari Fesharaki,

Jalali,

Karimi

et al. 2023

Opt Quant Electron

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Manganese-doped zinc germanate phosphors with vivid luminescent properties for anti-counterfeit applications

Cited by 4 publications

References 35 publications

Dynamic Luminescence of Lead-Doped Calcium Zinc Germanate Clinopyroxene for Multimode Anticounterfeiting

Dynamic Luminescence of Lead-Doped Calcium Zinc Germanate Clinopyroxene for Multimode Anticounterfeiting

Structural and Spectroscopic Analysis of Reddish-Orange Emitting (Y_1−x)₂WO₆:xEu³⁺ (0 ≤ x ≤ 0.11) Nanophosphors for Anti-Counterfeiting Application

UV excited thermoluminescence and kinetic analysis of CaZrO3:xCe3+ phosphors synthesized by sol–gel combustion method

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Manganese-doped zinc germanate phosphors with vivid luminescent properties for anti-counterfeit applications

Cited by 4 publications

References 35 publications

Dynamic Luminescence of Lead-Doped Calcium Zinc Germanate Clinopyroxene for Multimode Anticounterfeiting

Dynamic Luminescence of Lead-Doped Calcium Zinc Germanate Clinopyroxene for Multimode Anticounterfeiting

Structural and Spectroscopic Analysis of Reddish-Orange Emitting (Y1−x)2WO6:xEu3+ (0 ≤ x ≤ 0.11) Nanophosphors for Anti-Counterfeiting Application

UV excited thermoluminescence and kinetic analysis of CaZrO3:xCe3+ phosphors synthesized by sol–gel combustion method

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Structural and Spectroscopic Analysis of Reddish-Orange Emitting (Y_1−x)₂WO₆:xEu³⁺ (0 ≤ x ≤ 0.11) Nanophosphors for Anti-Counterfeiting Application