Garnet-structured persistent luminescence phosphor Ca3Al2Ge3O12:Cr3+ for dynamic anticounterfeiting applications

Zhang, Jiawei; Wang, Zhijun; Huo, Xiaona; Wang, Yu; Yang, Zhiping; Wang, Dawei; Zhao, Jinxin; Li, Panlai

doi:10.1039/d2dt01617f

Cited by 8 publications

(5 citation statements)

References 32 publications

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“…Figure c presents the TL measurement of ZnGa 2 O 4 : x % Bi 3+ samples to investigate the possible mechanisms of time-dependent dynamic PL. Obviously, the TL peak intensity of ZnGa 2 O 4 : x % Bi 3+ samples increases with Bi 3+ ion concentration, which indicates that Bi 3+ ion doping can increase the trap concentration . Additionally, the TL curve peaks of ZnGa 2 O 4 : x % Bi 3+ samples were located at 348, 365, 360, and 356 K, respectively (Figure c and Figure S6).…”

Section: Resultsmentioning

confidence: 92%

“…Obviously, the TL peak intensity of ZnGa 2 O 4 : x% Bi 3+ samples increases with Bi 3+ ion concentration, which indicates that Bi 3+ ion doping can increase the trap concentration. 57 Additionally, the TL curve peaks of ZnGa 2 O 4 : x% Bi 3+ samples were located at 348, 365, 360, and 356 K, respectively (Figure 3c and Figure S6). According to the empirical formula E = T m / 500 (E represents the trap depth, and T m is the temperature of the TL peak), trap depths of ZnGa 2 O 4 : x% Bi 3+ samples with slight changes from 0.696, 0.730, and 0.720 to 0.712 eV were obtained, meaning that the doping of Bi 3+ does not have a significant effect on the trap depth of the materials.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

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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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Section: Resultsmentioning

confidence: 92%

Section: ■ Results and Discussionmentioning

confidence: 95%

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

Yi,

Liu,

2023

Inorg. Chem.

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“…In a cell, each dodecahedron is bound to six octahedrons by a common edge bond, and each tetrahedron is bound to four octahedrons by a common top bond. The formation of the lattice provides a coordination environment for the doping of rare earth elements …”

Section: Resultsmentioning

confidence: 99%

“…The formation of the lattice provides a coordination environment for the doping of rare earth elements. 26 Figure 2a,b shows the morphology of CAGO: Dy 3+ , Eu 3+ phosphors studied by SEM. The aggregation phenomenon can be observed in the figures, with uneven particle size distribution and elliptical and conical shapes, which can better concentrate luminescence.…”

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confidence: 99%

Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Zhou,

Chen,

Jiang

et al. 2024

Inorg. Chem.

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A series of Ca 3 Al 2 Ge 3 O 12 : xDy 3+ , yEu 3+ phosphors were successfully prepared by the high-temperature solid-phase method. The phase and morphology of the phosphors were studied by means of Rietveld refinement and scanning electron microscopy. The results show that the phase is pure, and the crystal structure is the Ia3̅ d space group. In the Ca 3 Al 2 Ge 3 O 12 : xDy 3+ phosphors, using 380 nm excitation, phosphors showed blue ( 4 F 9/2 → 6 H 15/2 ) and yellow ( 4 F 9/2 → 6 H 13/2 ) emission peaks at 481 and 581 nm, respectively. In Ca 3 Al 2 Ge 3 O 12 : xDy 3+ , yEu 3+ phosphors, the energy transfer was inferred by the spectrum overlap of Dy 3+ and Eu 3+ , and the lifetime attenuation was analyzed from the perspective of dynamics; finally, the band gap structure of the phosphors was analyzed by combining diffuse reflection spectra with the first principle, and the energy transfer mechanism and luminescence mechanism were elaborated by combining theory and practice. The transition from blue white light to red light can be achieved by tuning the range of y in Ca 3 Al 2 Ge 3 O 12 : 0.015Dy 3+ , yEu 3+ . Wherein, when y = 0.07, phosphors, the chromaticity coordinate of warm white CIE is (0.3932, 0.3203), the color temperature is 3093 K, and the warm white light is synthesized. The thermal stability of the synthesized warm white phosphors is 90.1% (423 K), the thermal sensing factors are S amax = 5.51 × 10 −4 K −1 (303 K) and S rmax = 0.0359% K −1 (303 K), and the actual quantum efficiency is IQE = 52.48%. These results prove that Ca 3 Al 2 Ge 3 O 12 : Dy 3+ , Eu 3+ have good application prospects as singlecomponent warm w-LED devices.

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“…[22] Guo et al improved the emission of Cr 3+doped Mg 7 Ga 2 GeO 12 spinel system phosphors by introducing alkali earth metals (Ca, Sr, Ba) to replace Mg 2+ , thereby increasing lattice distortion. [23] In this study, based on Ca 3 Al 2 Ge 3 O 12 :Cr 3+ , [24] Mg 2+ was introduced to replace Ca 2+ , and a series of Ca 3-x Mg x Al 1.97 Ge 3 O 12 :0.03Cr 3+ (C 3-x M x AGG:0.03Cr 3+ ) phosphors were successfully synthesized using a high-temperature solid-phase method. The study discussed the influence of Mg 2+ substitution concentration on the phase purity and crystal structure of C 3-x M x AGG:0.03Cr 3+ phosphors.…”

Section: Introductionmentioning

confidence: 99%

Highly‐Efficiency Far‐Red Emission in Cr³⁺ Activated Ca_1.8Mg_1.2Al₂Ge₃O₁₂ toward Plant Precise Lighting

Yang,

Zheng,

Zou

et al. 2024

Advanced Optical Materials

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Far‐red (FR) region (beyond 700 nm) lighting sources possess special potential for plant lighting. However, it remains a challenge to obtain high‐performance Cr3+‐doped FR phosphors. This study developed a FR phosphor, Ca1.8Mg1.2Al2Ge3O12:Cr3+ (CMAGG: Cr3+), using the cation substitution strategy. Under 438 nm blue light excitation, the phosphors display FR emission centered at 720 nm with a full width at half maximum (FWHM) of 91 nm. Benefit from the favorable match with the FR phytochrome (Pfr), the phosphor is combined with InGaN blue light chips to create a FR phosphor‐converted light‐emitting diode (pc‐LED), which is used in Italian lettuce growth experiments and it results shown in a 15% increase in fresh weight and a 6.5% increase in dry weight. Notably, supplemental FR light modulated its growth morphology. The results of this study will be useful for further research on novel Cr3+‐doped FR phosphors to meet the precise spectral requirements for plant growth.

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Garnet-structured persistent luminescence phosphor Ca₃Al₂Ge₃O₁₂:Cr³⁺ for dynamic anticounterfeiting applications

Abstract: Fluorescent materials gradually become a hot spot in the field of anti-counterfeiting, multifunctional phosphors used in anti-counterfeiting designs still have the problems of disordered reading sequence, difficult to detect, and...

Cited by 8 publications

References 32 publications

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

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

Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Highly‐Efficiency Far‐Red Emission in Cr³⁺ Activated Ca_1.8Mg_1.2Al₂Ge₃O₁₂ toward Plant Precise Lighting

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Garnet-structured persistent luminescence phosphor Ca3Al2Ge3O12:Cr3+ for dynamic anticounterfeiting applications

Abstract: Fluorescent materials gradually become a hot spot in the field of anti-counterfeiting, multifunctional phosphors used in anti-counterfeiting designs still have the problems of disordered reading sequence, difficult to detect, and...

Cited by 8 publications

References 32 publications

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

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

Garnet Structure-Activated Warm White Light Phosphors Ca3Al2Ge3O12: Dy3+, Eu3+ with Ultrahigh Thermal Stability and Tunable Luminescence

Highly‐Efficiency Far‐Red Emission in Cr3+ Activated Ca1.8Mg1.2Al2Ge3O12 toward Plant Precise Lighting

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Garnet-structured persistent luminescence phosphor Ca₃Al₂Ge₃O₁₂:Cr³⁺ for dynamic anticounterfeiting applications

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

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

Garnet Structure-Activated Warm White Light Phosphors Ca₃Al₂Ge₃O₁₂: Dy³⁺, Eu³⁺ with Ultrahigh Thermal Stability and Tunable Luminescence

Highly‐Efficiency Far‐Red Emission in Cr³⁺ Activated Ca_1.8Mg_1.2Al₂Ge₃O₁₂ toward Plant Precise Lighting