Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 5
·1747-1753
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IF 6.4
Xiaowei Zheng,Yao Cheng,Yan Gao,Tao Hu,Ju Xu,Hang Lin,Yuansheng Wang
Dual-response mechanoluminescence (ML) enables light emission upon both the application and withdrawal of mechanical stress, which can provide novel opportunities for stress-sensing. Herein, we present the ML performance of doped ZnGa2O4–PDMS composites with a focus on the dual-response ML behavior upon the dynamic stretching–releasing cycle. Specifically, it was found that the dual-response ML behavior of ZnGa2O4 is doping dependent, which was further proved to be related to doping induced trap distribution. Finally, ZnGa2O4:Mn/PDMS with dual-response ML was used as an electronic skin to demonstrate its unique potential for stress-sensing applications.
研究领域:
材料科学
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光学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yiping Wu,Meng Wu,Shiwei Yang,Cong He,Chunwen Ye,Yanjie Zhang
Herein, a series of Mn-activated ZnGa2O4 (ZGO) phosphors have been developed for multifunctional applications. The characteristic green and red emission at 503 and 668 nm of Mn-activated ZGO phosphors can be observed under excitation of 247 and 375 nm, respectively, attributed to the partial oxidation of Mn2+ ions resulting in the coexistence of Mn2+ and Mn4+ ions in the host lattice. The valence modulation of Mn content not only realizes the adjustment of red and green luminescence intensity but also achieves the management of persistent luminescence time and thermo-luminescence time. Further, the codoping of Mg2+ could transform the position occupancy preference of Mn and effectively facilitate the conversion of Mn2+ to Mn4+, leading to the regulation of the valence state of manganese ions. Surprisingly, the existence of Mg2+ ions broadens the emission band of Mn4+ and enhances the photoluminescence intensity to 3.8 times, which can be ascribed to the weakened crystal field leading to the downward shift of the 4T2 energy level and the increase of Mn4+ concentration. For this valence modulation behavior, two different hypotheses about the occupancy of Mg2+ have been proposed to explain the corresponding phenomenon. Finally, the potential applications of the synthesized phosphors have been explored in advanced anticounterfeiting strategies, information storage, and plant lighting field.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
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2023
·
IF 4.6
Zishuo Yi,Peng Liu,Yan Xu
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.
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2013
·Vol. 96
·期 8
·2481-2485
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IF 2.107
Juanjuan Xue,Songping Wu,Jianhui Li
Spinel ZnGa 2 O 4 ceramics were synthesized by conventional solid-state method and their microwave dielectric properties were investigated. The phase evolution and microstructures of specimens were studied by XRD and SEM. The textured surface microstructures of ZnGa 2 O 4 ceramics formed at high sintering temperatures. The spinel-structured ZnGa 2 O 4 ceramics sintered at 1385°C exhibited excellent microwave dielectric properties: a dielectric constant (ε r ) of 10.4, a quality factor ( Q × f ) of 94.600 GHz, and a temperature coefficient of resonant frequency (τ f ) of −27 ppm/°C. ZnGa 2 O 4 ceramics have a low sintering temperature, a wide temperature region, and a small negative τ f value. They are promising candidate materials for millimeter-wave devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Caiyan Yu,Dong Yan,Sunqi Lou,Chao Xia,Mengmeng Cao,Tongtong Xuan,Jing Wang,Huili Li
Acetylacetonate (acac) passivated and europium incorporated ZnGa 2 O 4 nanocrystals (ZGO:Eu NCs) were successfully prepared via a facile one-step non-injection process in oleylamine at a relatively low reaction temperature of 300 °C under N 2 ambient. The resultant ZGO:Eu NCs exhibited a well-dispersed morphology with an average particle size of 4 nm. The enhanced and broad absorption band from 250 to 450 nm is attributed to the synergistic effect between the acac as an antenna and the coexistence of Eu 3+ and Eu 2+ . Under 405 nm excitation, a full spectrum emission covering from 400 to 720 nm was observed. The sharp red emission coming from Eu(III) 5 D 0 → 7 F J (J = 1–4) transitions can be enhanced by adjusting Eu concentrations and reaches the optimum at 20 at% Eu. Subsequently, the as-prepared NCs were transferred into an aqueous media via a ligand exchange by polyethyleneimine (PEI) to obtain the hydrophilic ZGO:Eu@PEI NCs. The initial fluorescent properties are preserved well. Finally, the strong red fluorescence emission , suitable excitation window, high photo-stability, excellent water solubility, and prominent bio-compatibility make ZGO:Eu@PEI NCs as high quality bio-imaging probes successfully identify living KB cells. The method mentioned in this paper overcomes the bottle-neck of the inorganic bulk phosphors as probes in bio-imaging, and as a result, expands their applications in optical detection and medical diagnosis fields.
研究领域:
材料科学
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生物医学工程
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光学检测
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DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Zhengfa Dai,Xinyu Mao,Qiang Liu,Danyang Zhu,Haohong Chen,Tengfei Xie,Jian Xu,Dariusz Hreniak,Martin Nikl,Jiang Li
ZnGa 2 O 4 (ZGO) persistent luminescence (PersL) ceramics doped with different concentrations of Cr 3+ were prepared by the co-precipitation method and hot isostatic pressing (HIP) post-treatment. After HIP post-treatment, the ZGO PersL ceramics was significantly improved from opaque to transparent visual appearance due to the elimination of micro-pores during HIP process. The effects of Cr 3+ concentration on the morphology, transmittance and PersL properties of ZGO PersL ceramics were systematically investigated. The ZGO PersL ceramics with higher Cr 3+ dopant concentrations show less micro-pores and higher transmittance, which indicates that the Cr 3+ can also work as a sintering additive to increase the density and to improve the optical quality of ZGO PersL ceramics. The photoluminescence excitation (PLE) and emission (PL) intensities increase with the increase of Cr 3+ concentration up to 0.25 at.%. At yet higher Cr 3+ concentrations, the ZGO PersL ceramics exhibits weaker PL and PLE intensities which is probably caused by the concentration quenching effect. However, the PersL decay curves show that the PersL performance of ZGO ceramics increases with increasing Cr 3+ concentrations, indicating that the doping by Cr 3+ ions may cause another traps formation leading to stronger and longer PersL. The PersL decay curves of all ZGO PersL ceramics were fitted by the second-order exponential function, indicating that at least two kinds of traps with different electron release rates exist in the ZGO ceramics. The influence of Cr 3+ concentration on the thermoluminescence (TL) of ZGO PersL ceramics was also studied, and the results showed that the TL curves of the pre-sintered ceramics shifted to lower temperatures, indicating that the depth of trap related to Cr 3+ ions is shallower than the depth of trap caused by the intrinsic defects.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zuizhi Lu,Hua Fan,Yingjun Ou,Mianhong Chen,Ye Yang,Linawa Shen,Liya Zhou,Xiaotong He,Jiansheng Zhao,Peican Chen
Recently, near-infrared (NIR) light-emitting diodes (LED) have attracted much research attention globally. To advance this technology, NIR phosphors with high efficiency, thermal stability, and broad bands are required. In this work, we modified ZnGa 2 O4:Cr 3+ phosphor with Mg 2+ ions. Results show that this method improves the luminescence intensity of ZnGa 2 O4:Cr 3+ phosphor, and the emission wavelength of the sample can be changed by doping different Mg 2+ concentrations. This method also improved the thermal stability of the samples. The quantum yield of Mg-modified ZnGa 2 O 4 :Cr 3+ phosphors reached 87.12%, and the white LED fabricated with Zn 0.4 Mg 0.6 Ga 2 O 4 :0.01Cr 3+ phosphor and commercial Y 3 Al 5 O 12 :Ce 3+ phosphor demonstrated good performance. The NIR-LED fabricated with Zn 0.4 Mg 0.6 Ga 2 O 4 :0.01Cr 3+ phosphor achieved a photoelectric conversion efficiency of 7.17%. The lines on the surface of an orange taken by a NIR camera reveal that phosphor can be used in night vision lighting. Meanwhile, the distribution of blood vessels in the human palm highlights the promising biological applications of the Zn 0.4 Mg 0.6 Ga 2 O 4 :0.01Cr 3+ phosphor.
研究领域:
材料科学
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光学工程
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生物医学工程
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Lang Pei,Zhenggang Luo,Xusheng Wang,Zhanfeng Ma,Yuhang Nie,Jiasong Zhong,Ding Yang,Sateesh Bandaru,Bao-Lian Su
The conversion of CO 2 into syngas , a mixture of CO and H 2 , via photocatalytic reduction , is a promising approach towards achieving a sustainable carbon economy. However, the evolution of highly adjustable syngas, particularly without the use of sacrifice reagents or additional cocatalysts, remains a significant challenge. In this study, a step-scheme (S-scheme) 0D ZnGa 2 O 4 nanodots (∼7 nm) rooted g-C 3 N 4 nanosheets (denoted as ZnGa 2 O 4 /C 3 N 4 ) heterojunction photocatalyst was synthesized vis a facial in-situ growth strategy for efficient CO 2 -to-syngas conversion. Both experimental and theoretical studies have demonstrated that the polymeric nature of g-C 3 N 4 and highly distributed ZnGa 2 O 4 nanodots synergistically contribute to a strong interaction between metal oxide and C 3 N 4 support. Furthermore, the desirable S-scheme heterojunction in ZnGa 2 O 4 /C 3 N 4 efficiently promotes charge separation, enabling strong photoredox ability. As a result, the S-scheme ZnGa 2 O 4 /C 3 N 4 exhibited remarkable activity and selectivity in photochemical conversion of CO 2 into syngas, with a syngas production rate of up to 103.3 μ mol g −1 h −1 , even in the absence of sacrificial agents and cocatalyst. Impressively, the CO/H 2 ratio of syngas can be tunable within a wide range from 1:4 to 2:1. This work exemplifies the effectiveness of a meticulously designed S-scheme heterojunction photocatalyst for CO 2 -to-syngas conversion with adjustable composition , thus paving the way for new possibilities in sustainable energy conversion and utilization.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Junqing Xiahou,Qi Zhu,Lin Zhu,Siyuan Li,Ji-Guang Li
Modern engineering fields put forward requirements for optical temperature sensors, which need natural-light excitation/storage and near-infrared (NIR) afterglow emission for some special conditions. Here, NIR persistent luminescent phosphors of ZnGa2–x(Mg/Ge)xO4:Cr3+ (x = 0–1.25) have been synthesized. The incorporation of Mg2+/Ge4+ ions in ZnGa2O4:Cr3+ resulted in more defect clusters of “MgGa′–GeGa•” and “ZnGa′–GeGa•” and interstitial oxygens (OInt). Increasing the calcination temperature and Mg2+/Ge4+ doping both contributed to the generation of OInt. Higher efficiency of visible light excitation was observed, mainly due to the defect clusters and OInt. The samples exhibited a bright NIR emission at 695 nm by exposure to UV or visible light, and the NIR signal can last longer than 1 h after the stoppage of excitation. Incorporation of Mg2+/Ge4+ and increasing the calcination temperature both resulted in a deeper trap depth. However, the density of trapped charge carriers takes the dominant role in the persistent luminescence. Therefore, the x = 0.25 sample, having the most trapped charge carriers, exhibits the best afterglow performance. The prepared phosphor exhibited a temperature-dependent persistent luminescence behavior, which can charge natural light and release NIR light repeatedly many times, indicating that they are the potential natural-light rechargeable materials for temperature sensing.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 20
·6846-6853
·
IF 7.367
Zhihao Zhou,Wei Zheng,Jintao Kong,Yan Liu,Ping Huang,Shanyong Zhou,Zhuo Chen,Jianlin Shi,Xueyuan Chen
Persistent luminescence nanoparticles (PLNPs) have shown great promise in the field of biomedicine, but are currently limited by the challenge in the synthesis of high-quality PLNPs with bright persistent luminescence and a long afterglow time. Herein, we report a facile strategy for the synthesis of monodisperse, rechargeable and LED-activated ZnGa2O4 : Cr3+ near-infrared (NIR) PLNPs based on a modified solvothermal liquid–solid-solution method. The as-synthesized PLNPs are not only flexible for bioconjugation, but could also circumvent the limitation of the weak persistent luminescence and short afterglow time that most PLNPs confronted owing to their rechargeable capability. It was unraveled that both thermal activation and quantum tunneling mechanisms contributed to the afterglow decay of the PLNPs, and the quantum tunneling was found to dictate the LED-activated afterglow intensity and lasting time. Furthermore, by utilizing the superior excitation-free persistent luminescence, we demonstrated for the first time the application of biotinylated ZnGa2O4 : Cr3+ PLNPs as background-free luminescent nano-bioprobes for sensitive and specific detection of avidin in a heterogeneous assay with a limit of detection down to ∼150 pM, thus revealing the great potential of these NIR PLNPs in ultrasensitive biodetection and bioimaging.
研究领域:
材料科学
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生物医学工程
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yiping Wu,Meng Wu,Jingjie Yu,Yuru Wang,Jinlong Wang,Yingwei Xu,Yanjie Zhang
Optical information encryption based on luminescence materials have received much attention recently. However, the single luminescence mode of the luminescence materials greatly limits its anti-counterfeiting application with high safety level. Here, a series of luminescence materials of Tb 3+ and Bi 3+ co-doped ZnGa 2 O 4 phosphors with great correspondence in photoluminescence (PL), persistent luminescence (PersL), and thermoluminescence (TL) modes was synthesized by the conventional solid-phase method for the application in multi-modal anti-counterfeiting fields. Under the excitation of 254 nm, ZnGa 1.99 O 4 :0.01 Tb 3+ , yBi 3+ (y = 0.001,0.002) sample exhibited a broad blue emission band (the transition from [GaO 6 ]) at 440 nm and the characteristic emission peaks of Tb 3+ at 495 nm, 550 nm, 591 nm and 625 nm, corresponding to the transitions of 5 D 4 - 7 F n (n = 6, 5, 4, 3), respectively. Interestingly, the co-doping of Bi 3+ ions improve the crystallinity and particle size of the phosphor, subsequently enhanced the PL intensity of Tb 3+ to 6 times that of Tb 3+ singly doped ZnGa 2 O 4 phosphor. Further, the flexible films with multi-modal luminescence properties have been fabricated through the unique TL and PersL characteristics of ZnGa 2 O 4 : Tb 3+ , Bi 3+ phosphors, including “Optical information storage film”, “snowflake and characters” and “QR code”. Moreover, a set of optical information encryption is obtained by combining ZnGa 2 O 4 :Tb 3+ , Bi 3+ phosphor and red emitting phosphor. The results indicate that ZnGa 2 O 4 :Tb 3+ , Bi 3+ phosphor with multi-modal stimulus response can be expected to be potentially used in the applications of optical information storage and anti-counterfeiting fields.
研究领域:
材料科学
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光学工程
·
物理学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2240-2249
·
IF 2.2
Shi Zitao,Li Shasha,Zheng Zeyu,Feng Xiaodong,Fang Zixuan,Yang Jun,Tang Bin
The rapidly developing field of wireless communication technology requires advanced microwave dielectric ceramic materials. Here, spinel-structured MgGa 2 O 4 and ZnGa 2 O 4 ceramics were prepared using a reaction sintering method. The effect of sintering temperature was investigated with respect to the crystal structure, microstructure, and microwave dielectric properties of MgGa 2 O 4 and ZnGa 2 O 4 ceramics. Rietveld refinement analysis and quality factor ( Q × f ) values suggested that the occupancy sites and percentage of cations in MgGa 2 O 4 would affect the microwave dielectric properties. Microstructure analysis indicated that abnormal grain growth at higher sintering temperatures would degrade the microwave dielectric properties of ZnGa 2 O 4 ceramics. MgGa 2 O 4 ceramics sintered at 1610°C exhibited promising microwave dielectric properties, i.e., ε r = 9.4, Q × f = 167,500 GHz, and τ f = −63 ppm/°C, while ZnGa 2 O 4 ceramics sintered at 1550°C possessed a higher ε r and a lower Q × f value of 10.5 and 126,900 GHz, respectively, and τ f = −60 ppm/°C. The τ f values of MgGa 2 O 4 and ZnGa 2 O 4 ceramics were tuned to near-zero levels by adding 8 mol.% CaTiO 3 . These results indicate that MgGa 2 O 4 and ZnGa 2 O 4 ceramics produced by reaction sintering show promise for applications in the field of 5G communication.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）