Journal of Materiomics
·
2022
·
IF 8.589
Ge Gao,Qiang Li,Pengxiao Hao,Xiao Huang,Hongjie Luo
In this work, a series of Zn x Mg 1.99- x SnO 4 :0.01Mn 2+ ( x = 0, 0.01, 0.02, 0.03, 0.04) green long afterglow phosphors are prepared by high-temperature solid-phase reaction. The photoluminescence and long afterglow performance of host material doped with Zn 2+ are investigated. The results show that the emission peak of Mn 2+ is red-shifted by 5 nm with increasing Zn 2+ concentration. Zn 0.03 Mg 1.96 SnO 4 :0.01Mn 2+ phosphor has the strongest green luminescence intensity with the chromaticity coordinates of (0.085 7, 0.608 3) under 270 nm, and Zn 0.01 Mg 1.98 SnO 4 :0.01Mn 2+ phosphor has superior long afterglow performance with average lifetime of 102.41s. The afterglow decay and thermoluminescence curve of phosphor are used to explain the mechanism of long afterglow luminescence. Meanwhile, the afterglow intensity distribution of each pixel in Zn 0.01 Mg 1.98 SnO 4 :0.01Mn 2+ coating samples is carried out by hyperspectral imaging, and the optimal luminescence intensity and uniformity of the sample are obtained at a phosphor/epoxy mass ratio of 0.002 5. Therefore, Zn 0.01 Mg 1.98 SnO 4 :0.01Mn 2+ can be a potential candidate of novel long afterglow phosphors, and hyperspectral imaging also provides new research approaches for the rational proportioning of luminescent materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Pengcheng Zhang,Yuanyuan Zhang,Kuo Gao,Diao Zhang,Yu Zhao,Jin Lin,Na Li,Zixuan Shi,Mingxi Zhang,Fengfeng Li
With the growing severity of counterfeiting threats, counterfeiting anti-counterfeiting technologies including fluorescence, QR codes, and query-based labels, rely on static patterns with limited encryption security, leading to inadequate protection and a lack of diversity in anti-counterfeiting strength. Consequently, advancing dynamic anti-counterfeiting systems has become an urgent priority. This study developed a novel dynamic anti-counterfeiting strategy through the synthesis of yellow persistent luminescent CaGa 2 O 4 :Mn 2+ via high-temperature solid-state reaction. In this research, the results demonstrated that at the doping concentration of 0.001 mol Mn, the sample exhibited the best luminescence properties. Furthermore, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) analyses revealed that electron traps responsible for the afterglow process primarily originated from oxygen vacancies, and the underlying afterglow mechanism was elucidated. Finally, CaGa 2 O 4 :Mn 2+ long-lasting phosphorescent ink was synthesized and anti-counterfeiting labels were fabricated via screen printing technology. The material's intrinsic photoresponsive behavior enables time-dependent luminance decay post-UV excitation, establishing dynamic authentication through programmable optical evolution, Which effectively realize dynamic anti-counterfeiting.
研究领域:
材料科学
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光学材料
·
安全技术
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固态化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongfa Li,Wenjun Zhang,Chengyue Xin,Zihan Chen,Jian Sheng
Mn ions in different valence states can emit light of different colors in an octahedral coordination environment, which is conducive to the development of a single matrix with multi-color luminescence and applications in the field of anti-counterfeiting. The dual mode multi-color luminescent material CaSb 2 O 6 : Mn has been successfully synthesized using a single Mn source in the atmosphere. The CaSb 2 O 6 matrix itself can also absorb 285 nm UV light, emit blue light, and show a long afterglow phenomenon. Both Mn 4+ and Mn 2+ ions will appear in the [SbO 6 ] octahedra, whether the Mn source adopts MnCO 3 or MnO 2 . The Mn 4+ ion exhibits red emission upon UV excitation at 347 nm. The Mn 2+ ion can emit a bright green light at 285 nm excitation while exhibiting a long afterglow phenomenon. In this study, the Mn 2+ doped octahedron showed unique green emission and broadens the range of its photoluminescence (PL) wavelength. The performance of the material's long afterglow properties on the digital codes demonstrates its potential for dynamic anti-counterfeiting.
研究领域:
材料科学
·
光学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Zhihao Zhou,Puxian Xiong,Huailu Liu,Mingying Peng
Long persistent phosphors (LPPs) with ultraviolet (UV) luminescence have great potential for application in the fields of biomedicine, environmental, and catalysis. However, it is currently limited by the design and development of remarkable UV LPPs with a suitable spectral region and an ultralong afterglow decay time. Herein, we develop a new type of Bi3+-activated LiScGeO4 LPP, which exhibits bright ultraviolet-A (UVA) persistent luminescence (PersL). Because of the existence of numerous stabilized effective traps, the as-synthesized phosphors can undergo an ultralong PersL decay time far longer than 12 h. The PersL properties, effective trap depths, distributions, and types, as well as the possible mechanism for the PersL behavior of LiScGeO4:Bi3+, are comprehensively surveyed utilizing PersL excitation spectra, PersL decay analyses, thermoluminescence experiments, and X-ray photoelectron spectroscopy. This work can cover the shortage of LPPs in the UV region and also can lay the foundation for the development of more excellent UV LPPs toward versatile novel applications.
研究领域:
材料科学
·
生物医学
·
环境科学
·
催化领域
✓ 已验证
DOI
高影响因子
OPTICS LETTERS
·
2021
·Vol. 46
·期 16
·3829-3832
·
IF 3.776
Jinxing Zhao,Xu Li,Shengnan Li,Xinru Zhao,Fenghe Wang,Fenghe Wang,Dawei Wang,Guoyi Dong,Li Guan,Li Guan
Optical anti-counterfeiting has been developed as a promising optical-sensing technique. A self-activated ${{\rm KGaSiO}_4}$ phosphor was successfully prepared using the traditional solid-state method. The photoluminescence spectra of the as-synthesized phosphors indicate that the ultra-narrow band emission with green light peak at 503 nm is obtained when phosphors are excited by 254 nm UV light. Additionally, the measured afterglow curve shows that the emission of this phosphor can last more than 1200 s after UV excitation stops, which indicates that ${{\rm KGaSiO}_4}$ is a potential candidate for anti-counterfeiting materials. The luminescent and decay mechanism are discussed by theoretical calculation and thermo-luminescent spectra in detail. The theoretical model can provide support for explaining the mechanism of narrow band or persistent phosphor.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 3
·1143-1150
·
IF 6.641
Zhizhen Wang,Zhen Song,Lixin Ning,Quanlin Liu
Warm-color persistent luminescent materials are strongly desired for signage markings and medical imaging in comparison with green or blue counterparts. Herein we report a novel yellow long-persistent phosphor, Nb-doped Sr3SiO5:Eu2+, with a peak wavelength of ∼580 nm and persistence time of more than 14 hours at the 0.32 mcd m−2 threshold value after UV radiation. A combination of thermoluminescence (TL), thermoluminescence excitation (TLE), electron paramagnetic resonance (EPR) measurements and density functional theory (DFT) calculations reveals that the persistent luminescence enhancement is attributed to a significant Nb-induced increase of oxygen vacancies that act as electron trapping centers with appropriate trap depths. Groups of time-dependent color-change images are realized with this material, which has potential applications as anti-counterfeit and indicator marks. This investigation also expands the application of transition metal (TM) ions to the field of persistent luminescence and would motivate further exploration of TM substitutions to design and improve silicate or aluminosilicate persistent phosphors with superior performance.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTIK
·
2021
·
IF 2.443
Kai Ye,Xiaoliang Yang,Siguo Xiao
Bi 3+ , Mn 2+ co-doped CaZnGe 2 O 6 red long afterglow materials were prepared by high temperature solid state reaction method. The phosphor has broad excitation band ranging from 220 nm to 350 nm with two peaks at 255 nm and 300 nm and can give blue, green and red emission band peaking at 448 nm, 530 nm and 645 nm, respectively. Due to the emission properties of Bi 3+ ions and the Bi 3+ →Mn 2+ energy transfer, the co-doped Bi 3+ ions can not only enhance the PL luminescence of the phosphor, but also adjust the emission color. After irradiation of 300 nm ultraviolet light , the phosphors exhibits long-persistent red phosphorescence. Thermoluminescence tests demonstrate that the introduction of Bi 3+ ions can increase the trap depth and trap concentration, greatly improving the afterglow time and brightness of the CaZnGe 2 O 6 : Mn 2+ phosphor. The present work might provide reference for designing new rare earth free red long afterglow materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2022
·Vol. 37
·期 12
·2018-2027
·
IF 2.613
Guangjin Ou,Hongqing Song,Xinyong Gong,Ruirui Cui,Chaoyong Deng
A new green luminescent phosphor, Li(Y 1- x Tb x )GeO 4 , was prepared using a high-temperature solid-phase method. The X-ray diffraction (XRD) measured spectrum agreed well with the standard card JCPDS No. 02-3479, indicating that it is a quaternary compound belonging to the space group of Pnma(62) with an orthogonal crystalline phase; the excitation and emission spectra measured using the phosphor spectrometer showed that it can be effectively excited by near-ultraviolet light at 378 nm and blue light at 482 nm, and produced excellent strong emission of green light at 550 nm. The afterglow test results show that the sample had a good long afterglow effect at lower doping concentrations; the thermal stability test results showed that its thermal burst activation energy ΔE ≈ 0.37 eV had its excellent thermal stability. The rare earth Tb 3+ -doped green phosphor, LiYGeO 4 :Tb 3+ , has potential applications in household lighting, medical therapy, and optical storage.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA B-CONDENSED MATTER
·
2022
·
IF 2.988
Xianzhi Zeng,Haoyi Wu,Junhao Peng,Chuanlong Wang,Guangting Xiong,Yahong Jin,Yihua Hu
The improvement of luminescent properties is important for expanding the application of long afterglow phosphor (LAP). Here, the melilite-type Sr 1·97 MgSi 2 O 7 : Eu 2+ 0.01 , Dy 3+ 0.02 LAP was studied with Bi 3+ as the second co-dopant. Both photoluminescence (PL) and thermoluminescence (TL) were improved in terms of intensity and afterglow lifetime when the doping concentration of Bi 3+ exceeded 2.5 mol%, and the optimized point was 3.5 mol%. As compared to the case of Eu 2+ - Dy 3+ double doping, the improved PL of Eu 2+ - Dy 3+ - Bi 3+ triple doping samples was attributed to better photon absorption . The improved TL and afterglow were attributed to the synergistic strengthening density of the traps by Bi 3+ and the deepening of trapping by Dy 3+ , if their distance was sufficient close. As a result, both TL and afterglow optimized at a concentration of 2 mol% Dy 3+ - 3.5 mol% Bi 3+ coupling.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu-Xi Bi,Dan Zhao,Shao-Jie Dai,Rui-Juan Zhang,Qing-Xia Yao
Ion doping is one of the most effective strategies to induce interesting luminescence properties of materials. In this work, the Bi 3+ and Eu 3+ are introduced into a ‘114’ host material YBaZn 3 GaO 7 (YBZG) to generate photoluminescence (PL), long-persistent luminescence (LPL) and colour change properties. The co-doped YBZG:0.003Bi 3+ / y Eu 3+ can generate multi-color emissions from green, through yellow to orange with the increasing of Eu 3+ concentration. There are F-like color centers around conduction band (CB) of YBZG host with shallow or deep energy levels. The electrons trapped by deep levels response to the PC properties, whereas these for shallow levels response to the LPL properties. The PC process from white to apricot is reversible. By alternating thermal treatment and irradiation, YBZG:0.003Bi 3+ was proved to have a good fatigue resistance of 3.1 %. For YBZG:0.003Bi 3+ /0.05Eu 3+ , it shows bright orange LPL emission when the irradiation is removed after 24 min. The achievement of this paper provides a design idea that if the host structure of a phosphor is of flexible and easy to occur defect, not only PL property, but also PC and LPL properties are probably able to realize.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Weiguang Wang,Shuman Zhang,Jiani Huang,Yang Xu,Qiya Gao,Zhisheng Gao,Xuxuan Gu,Huanhuan Li,Gaozhan Xie,Hui Li,Chen Xie,Runfeng Chen,Ye Tao
Near-infrared afterglow materials, which can significantly reduce background fluorescence and improve penetration in living organisms, are vital for precision imaging. However, the practicability of near-infrared afterglow materials has been hindered by their short lifetime and low luminescence quantum efficiency. Herein, we propose an effective strategy for doping water-soluble afterglow polymer host materials with fluorescent dyes, leveraging the step-by-step Förster energy transfer principle to realize near-infrared afterglow. Benefiting from the ultralong lifetime of 4.2 s and high quantum efficiency of 20.1 % for the blue host PAMCz as well as efficient cascade energy transfer efficiency of 83.3 %, the developed NIR afterglow exhibits luminescence peaked at 750 nm, a lifetime of 1.4 s, and a quantum efficiency of 17.1 %. A successful demonstration of near-infrared afterglow biological imaging with a penetration depth of 3.4 mm and signal-to-background ratio of 48.3, has been established. These advancements expand the scope of near-infrared afterglow materials by combining an ultralong lifetime with high quantum efficiency, providing a roadmap for designing robust near-infrared materials.
研究领域:
材料科学
·
生物医学工程
·
光学成像
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Jiaqi Guo,Zhangdi Lu,Chenmin Li,Yuming Miao,Bingbing Zhang,Jacky W. Y. Lam,Yu-e Shi,Zhenguang Wang,Ben Zhong Tang
Elemental sulfur is not traditionally considered as an afterglow material, even though it can be endowed with fluorescence properties through processing it into nanodots. Herein, we discovered that elemental sulfur powder could emit room temperature phosphorescence (RTP) with a lifetime of 3.7 ms. A long-lived (>12 s) afterglow emission at 77 K could also be observed by the naked eye. Detailed investigations suggested that such a special phenomenon was attributed to impurity-related traps coupled with conduction and valence bands. After the sulfur is processed into nanodots, the rigid environment formed by the cross-linking of the surface ligands could stabilize the excited charges from quenching. This results in the promotion of RTP intensity and lifetime to achieve an emission lifetime of 200 ms. These results confirm the unique RTP of elemental sulfur powder, and also suggest the potential of sulfur-based materials as versatile components for the development of RTP materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）