Manipulating trap distribution and density by chemical unit cosubstitution for near-infrared persistent luminescent Zn1−2xLixGa2+xO4:Cr3+ solid solutions

Lyu, Shaoxing; Zhou, Pengli; Du, Jiaren; Wang, Tengyue; Wang, Panqin; Wang, Henggang; Sun, Shan; Lin, Hengwei

doi:10.1039/d2tc03741f

Cited by 11 publications

(7 citation statements)

References 45 publications

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“…The application of long afterglow anti-counterfeit markings composed of different matrix components can be maturely applied to anti-counterfeit marking applications due to its variable color, which is not conducive to forgery, but the cost is high and the variety of substrates available is very limited. [78,79] But single-mode afterglow luminescent materials can be easily forged by sophisticated counterfeiters via using substitutions with similar emissions, and the simple blending of different luminescent materials may lead to an uneven dispersion and a performance mismatch. Therefore, researchers tend to study different doping ions and different doping concentrations of the same doping ions under the same matrix component, which can be more safely and flexibly applied to anti-counterfeit marking applications.…”

Section: Different Matrix Componentsmentioning

confidence: 99%

Anti‐Counterfeiting Application of Persistent Luminescence Materials and Its Research Progress

Zhang,

Wang,

Huo

et al. 2023

Laser & Photonics Reviews

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Persistent luminescent materials can continue to emit light after stopping excitation, and their stored energy is gradually released during the decay time after persistent emitting, which makes the color and luminance changes in slow decay and plays an important role in protecting information and combating forgery. When combined with other anti‐counterfeiting technologies to form a multi‐modal and multi‐process anti‐counterfeiting design, it perfectly hides the real information and has a broad application prospect in anti‐counterfeiting logo design. A brief overview of the design of three different persistent luminescence‐based anti‐counterfeiting applications in unimodality to achieve information encryption in the time dimension. The energy stored in the trap is studied to be released by different physical stimuli and applied to stimulus‐like responsive persistent luminescent materials, and the design of persistent luminescence anti‐counterfeiting applications based on many different processes in dual‐modality, obtaining the dynamic anti‐counterfeiting effect of multiple processes in multiple modes. This work reviews the research background of persistent luminescent materials in the field of anti‐counterfeiting in recent years, compares the important breakthrough progress of persistent luminescent materials applied to anti‐counterfeiting research, and finally puts forward the current problems, future challenges, and development directions.

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Section: Different Matrix Componentsmentioning

confidence: 99%

Anti‐Counterfeiting Application of Persistent Luminescence Materials and Its Research Progress

Zhang,

Wang,

Huo

et al. 2023

Laser & Photonics Reviews

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“…A dynamic optical anticounterfeiting technique used for information recording and reading is preferentially designed with tunable fluorescence in response to external stimuli such as irradiation time, ion doping, excitation wavelength, and temperature. − Specifically, time-evolving dynamic multicolor PL luminescence significantly improves the confidentiality of information security because of its difficult-to-imitate character. Recently, an advanced dynamic optical anticounterfeiting strategy has been developed by capitalizing on time-evolving luminescent conversion for information encryption.…”

Section: Introductionmentioning

confidence: 99%

Multimode Dynamic Photoluminescence of Bi³⁺-Activated ZnGa₂O₄ for Optical Information Encryption

Yi,

Liu,

2023

Inorg. Chem.

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Optical storage technology for information encryption is a popular means of safeguarding information. Herein, a Bi3+-activated ZnGa2O4 multimode dynamic photoluminescence (PL) material is developed. Upon being irradiated with an ultraviolet lamp at a fixed excitation wavelength of 254 nm, the ZnGa2O4: x% Bi3+ (x = 0.5–5.0) samples exhibit varying degrees of dynamic PL emission due to a distinct Bi3+ doping effect. The mechanism underlying the dynamic PL of ZnGa2O4: Bi3+ associated with Bi3+-activated trap concentration modulation is investigated using thermoluminescence spectra. Additionally, the ZnGa2O4: 5% Bi3+ sample shows a reversible thermally responsive dynamic PL with a color variation from blue to red upon heating from 283 to 393 K. Predesigned procedures based on single-wavelength-mediated photochromic and thermochromic dynamic PL emissions of ZnGa2O4: Bi3+ are designed for rewritable optical data storage and high-level information encryption. Also, an enhanced encryption scheme with a mask encoding technique applying a ZnGa2O4: Bi3+ hybridized polyvinylidene difluoride film is then proposed to increase the security level. Accordingly, this work provides a feasible way to rationally design dynamic PL material offering more creative designs for safeguarding information via encryption.

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“…Near-infrared light (700–1400 nm) is an electromagnetic wave that exists between visible and mid-infrared light and is greatly utilized in plant growth, night vision, medical imaging, food analysis, and so on. − In recent years, NIR pc-LED, which is recognized as a new generation of NIR light source, has garnered a lot of attention due to its high efficiency and compact size. − Cr 3+ is one of the most frequent activators of NIR phosphors. Its luminescence is greatly impacted by the crystal field with a narrow emission in a strong crystal field and a broadband one in a weak crystal field.…”

Section: Introductionmentioning

confidence: 99%

Spectral Broadening in Cr³⁺-Doped Sr_0.92Mg_0.91Al_10.1O₁₇ NIR Phosphor Realized by Multi-crystallographic Site Occupation

Zheng

Kuang

Shen

et al. 2023

ACS Appl. Opt. Mater.

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Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) play an important role in nondestructive testing, medical imaging, food analysis, and so on. Broadband NIR phosphors are needed in order to cover the characteristic wavelengths of various matters. In this paper, a NIR phosphor, Sr 0.92 Mg 0.91 Al 10.1 O 17 (SMAO):Cr 3+ , with a full width at half maximum (FWHM) of 12−102 nm is achieved as a function of Cr 3+ concentration. Two Cr 3+ sites are observed by means of excitation spectra and fluorescence decay curves. The spectral broadening with the increase of Cr 3+ concentration is attributed to the increase of occupation ratio on the weak crystal field site by Cr 3+ . In addition, the difference in thermal stability between 2 E and 4 T 2 is employed to conduct the temperature measurement with a relative sensitivity of 0.43% K −1 at 270 K. A NIR pc-LED is fabricated using SMAO:0.03Cr 3+ phosphor combined with a 395 nm LED chip with radiation flux of 2.2 mW@10 mA and 15 mW@100 mA.

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Manipulating trap distribution and density by chemical unit cosubstitution for near-infrared persistent luminescent Zn_1−2xLi_xGa_2+xO₄:Cr³⁺ solid solutions

Abstract: Near-infrared (NIR) emitting phosphor with persistent luminescence has attracted much interest in the past decade, due to its widespread applications in medical diagnostics, night-vision surveillance, multi-level anti-counterfeiting, and security encryption....

Cited by 11 publications

References 45 publications

Anti‐Counterfeiting Application of Persistent Luminescence Materials and Its Research Progress

Anti‐Counterfeiting Application of Persistent Luminescence Materials and Its Research Progress

Multimode Dynamic Photoluminescence of Bi³⁺-Activated ZnGa₂O₄ for Optical Information Encryption

Spectral Broadening in Cr³⁺-Doped Sr_0.92Mg_0.91Al_10.1O₁₇ NIR Phosphor Realized by Multi-crystallographic Site Occupation

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Manipulating trap distribution and density by chemical unit cosubstitution for near-infrared persistent luminescent Zn1−2xLixGa2+xO4:Cr3+ solid solutions

Abstract: Near-infrared (NIR) emitting phosphor with persistent luminescence has attracted much interest in the past decade, due to its widespread applications in medical diagnostics, night-vision surveillance, multi-level anti-counterfeiting, and security encryption....

Cited by 11 publications

References 45 publications

Anti‐Counterfeiting Application of Persistent Luminescence Materials and Its Research Progress

Anti‐Counterfeiting Application of Persistent Luminescence Materials and Its Research Progress

Multimode Dynamic Photoluminescence of Bi3+-Activated ZnGa2O4 for Optical Information Encryption

Spectral Broadening in Cr3+-Doped Sr0.92Mg0.91Al10.1O17 NIR Phosphor Realized by Multi-crystallographic Site Occupation

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Manipulating trap distribution and density by chemical unit cosubstitution for near-infrared persistent luminescent Zn_1−2xLi_xGa_2+xO₄:Cr³⁺ solid solutions

Multimode Dynamic Photoluminescence of Bi³⁺-Activated ZnGa₂O₄ for Optical Information Encryption

Spectral Broadening in Cr³⁺-Doped Sr_0.92Mg_0.91Al_10.1O₁₇ NIR Phosphor Realized by Multi-crystallographic Site Occupation