Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 13
·6588-6597
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IF 5.1
Yongwen He,Jie Wang,Shaofan Fang,Junshan Qin,Long Feng,Birong Tian,Shaowei Feng,Zhaofeng Wang
Because of the unique and attractive mechanics–optics conversion without additional energy consumption, mechanoluminescence (ML) has shown widespread prospects in visualized mechanics sensing. However, the current ML-based sensing technique mainly relies on short-wavelength materials, which limits its application range. In this work, a novel ML material, Mn2+-doped CaGa4O7 (CGOM), is synthesized, and the composite elastomer CGOM/polydimethylsiloxane (PDMS) exhibits an intense and repeatable orange ML with a relatively long wavelength range of 500–710 nm. The initial ML intensity of the CGOM/PDMS is about 2.8 times that of ZnS:Cu/PDMS under the same testing conditions, which makes its ML visible in ambient light. The ML mechanism conforms to the interfacial triboelectricity-induced electron bombardment model, based on which the repeatable ML is realized without a pre-charging process. In addition, the ML of the CGOM/PDMS shows good responsiveness to the applied friction and tensile parameters. Based on these features, the CGOM/PDMS is further applied to visualized mechanics sensing by simulating the organism and the competitive sports scenarios.
研究领域:
材料科学
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光学材料
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力学传感
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发光材料
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柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Qinghang Liu,Yanbing Han,Mochen Jia,Zhuangzhuang Ma,Xu Chen,Linyuan Lian,Ying Liu,Jingli Ma,Jibin Zhang,Han Gao,Zhifeng Shi
Dynamic multicolor luminescent materials are highly promising for advanced anti-counterfeiting and information encryption, yet conventional systems largely rely on lanthanide rare-earth ions with fixed emission wavelengths and high costs. Here, we report a lanthanide-free strategy by doping transition-metal ions Sc 3+ and Cr 3+ into the CaGa 4 O 7 host. The dopant ions synergistically interact with the host lattice, creating multiple trap-regulated emission channels and simultaneously introducing multilevel trap states, which enable time-dependent carrier capture and release as the basis for dynamic multicolor luminescence. Under 254 nm UV excitation, CaGa 4 O 7 :Sc exhibits yellow-to-blue evolution, while CaGa 4 O 7 :Cr shows red-to-blue transitions. Importantly, the dynamic multicolor luminescence is also tunable at higher temperatures, where carriers from shallow traps are depleted, and the blue emission is thermally quenched. Thermoluminescence and optical studies reveal that Sc is associated with deep traps in the host and long-term memory of dynamic luminescence, whereas Cr is associated with shallow traps and short-term memory. Leveraging these features, we demonstrate advanced anti-counterfeiting and information encryption schemes, including time-gated patterns and ASCII-coded matrices. This work establishes transition-metal doping as a general, low-cost approach to high-performance dynamic multicolor luminescent materials, highlighting its potential to provide multifunctional, time- and temperature-resolved optical responses for secure information technologies.
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jian Zhang,Li Luo,Weiren Zhao,Wei Zhang,ZhengFa Hu
Recently, near-infrared phosphors have received a lot of attention due to their wide application in the field of detection and analysis, and it is urgent to develop efficient broadband NIR phosphors. In this paper, a conventional high-temperature solid-phase method was used to prepare a novel near-infrared phosphor CaGa 4 O 7 :Cr 3+ , Cr 4+ , which provides two emission bands ranging from 600 to 1000 nm and 1100–1600 nm. Although there are only four and five coordination sites in the CaGa 4 O 7 (CGO) lattice, the doping of the Cr 3+ ions in the CGO causes the Ga–O tetrahedral distortion into an octahedron , providing a favorable environment for the emission of the Cr 3+ ions. Under blue light excitation, Cr 3+ emits luminescence in the NIR I region from 600 to 1000 nm with a half-height width of up to 148 nm. With increasing Cr ion concentration , more and more Cr 4+ preferentially occupy the four coordinated Ga 3+ sites, and the intensity of the ultra-broad emission band in the NIR II region (1100 nm–1600 nm) increases with a full width at half maximum (FWHM) of 262 nm. To further optimize the emission spectrum , Yb 3+ was codoped into CGO: Cr 3+ , Cr 4+ , the energy transfers from Cr 3+ to Yb 3+ in CGO was found, thus filling the gap between 1000 and 1100 nm in the CGO emission spectrum and obtaining a more complete ultra-wide spectrum. Moreover, the luminescence mechanism, energy transfer efficiency, and quantum yield are also studied in detail, and the ability of CaGa 4 O 7 :Cr 3+ , Cr 4+ , and Yb 3+ luminescent materials to achieve ultra-broadband efficient near-infrared emission was demonstrated.
研究领域:
材料科学
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光学材料
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发光光谱学
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无机化学
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DOI
高影响因子
Materials Today Chemistry
·
2025
·
IF 6.7
Teng Zhang,Ruchun Zhao,Heyi Yang,Fangyi Zhao,Qinan Mao,Meijiao Liu,Jiasong Zhong
The security level of traditional long persistent luminescence (LPL) phosphor with a single adjustable decay time is increasingly insufficient to meet the demands of a rapidly advancing society, resulting in significant losses for individuals and corporations. Therefore, exploring a phosphor with a two-model of adjustable decay time and afterglow color is meaningful for advanced information encryption and anti-counterfeiting. Here, we propose a simple and efficient strategy to regulate the trap type and concentration in high defect tolerance matrix CaGa 4 O 7 (CGO), achieving tunable emission color, afterglow color and decay time. At first, we introduce the rare earth ions Tb 3+ to generate the new defects, and then substitute Ca 2+ with Zn 2+ in CGO:Tb 3+ (CZGO:Tb 3+ ) phosphors to increase the inherent defects concentration, thereby greatly increasing the number of band electrons trapped by the defects and improving their LPL performance. Owing to the lattice distortion, its luminescence performance is increased by 6.09 times. It is worth noting that CZGO:Tb 3+ phosphor has a variety of emission modes over time, so it has great potential in information anti-counterfeiting and encryption applications.
研究领域:
材料科学
·
光学材料
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信息安全
·
固体物理
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）