Nanoscale
·
2019
·Vol. 11
·期 13
·5998-6003
·
IF 6.97
Dongjun Shen,Yijuan Long,Jie Wang,Yuanyuan Yu,Jiangli Pi,Lili Yang,Huzhi Zheng
A reduction pathway was developed to tune the fluorescence quantum yield (QY) and emission wavelength of carbon dots (CDs). Reducing the original CDs (QY ca. 1.55%, maximum emission ca. 520 nm) with NaBH4 increased QY to 7.25% and blue-shifted the maximum emission to 450 nm. Treating the original CDs with LiAlH4 increased QY to ca. 7.44% and blue-shifted the maximum emission to 345 nm. The distinct fluorescence characteristics of the original CDs, NaBH4-treated CDs, and LiAlH4-treated CDs were conferred by their differing surface groups. Moreover, the original CDs, NaBH4-treated CDs, and LiAlH4-treated CDs responded differently to a specific oxidizer of hydroxyl groups. The increase in the fluorescence QY and blue-shift of the emission wavelength were explained. This study provides a foundation for the preparation and tuning of CDs with excellent fluorescence performance, as well as for the development CD-based fluorescent probes.
研究领域:
材料科学
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光学
·
化学
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3444
·
IF 5.719
Fei Han,Sai Ma,Dong Li,Md Mofasserul Alam,Zeheng Yang
An Sb2S3-sensitized TiO2(Sb2S3/TiO2) photo-anode (PA) exhibiting a high photo-electrochemical (PEC) performance in water oxidation has been successfully prepared by a simple chemical bath deposition (CBD) technique. Herein, the Raman spectra and XPS spectrum of Sb2S3/TiO2confirmed the formation of Sb2S3on the TiO2coatings. The Sb2S3/TiO2photo-anode significantly shifted the absorption edge from 395 nm (3.10 eV) to 650 nm (1.90 eV). Furthermore, the Sb2S3/TiO2photo-anode generated a photo-anodic current under visible light irradiation below 650 nm due to the photo-electrochemical action compared with the TiO2photo-anode at 390 nm. The incident photon-to-current conversion efficiency (IPCE = 7.7%) at 400 nm and −0.3 V vs. Ag/AgCl was 37 times higher than that (0.21%) of the TiO2photo-anodes due to the low recombination rate and acceleration of the carriers of Sb2S3/TiO2. Moreover, the photo-anodic current and photostability of the Sb2S3/TiO2photo-anodes improved via adding the Co2+ions to the electrolyte solution during photo-electrocatalysis.Keywords:Sb2S3/TiO2;photo-anode;long wavelength;photo-electrochemical;water oxidation
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Jinming Hu,Shengting Zhu,Ying Lv,Ronghui Guo,Min Gu,Yinan Zhang
Holography, as a technique for coherent wavefront reconstruction, is extensively used in numerous optical applications such as optical imaging, 3D display, photolithography, and optical artificial intelligence. In order to achieve highly compact and functional integration with optoelectronic devices, the hologram needs to possess ultrathin thickness as well as multicolor functionality. However, its thickness is typically limited to optical wavelength ranges due to the requirement for pronounced amplitude or phase modulation, and it generally operates at a single wavelength band without wavelength-multiplexed channels. Here, the hologram is decreased thickness to sub-ten nanometers by exploiting the large refractive index and strong exciton absorption of 2D perovskites. Ultrathin perovskite holograms and holographic neural networks with high stability are successfully developed by using femtosecond laser direct writing, and their operation wavelength can be rationally tuned from 400–515 nm through halide anion engineering. Consequently, the wavelength can be multiplexed with low cross-talks by stacked perovskite nanolayers for applications of holographic display and neural networks without the usages of complex optical structures or filters. This work provides a feasible and promising technical route for integrating ultrathin, high pixel density, and multiplexed holographic structures with flat optoelectronic devices for next-generation integrated optical systems.
研究领域:
光学
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材料科学
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人工智能
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12342-12347
·
IF 2.7
Yu Qi,Chengyue Xin,Wenjun Zhang,Zhongfa Li,Zihan Chen,Zhongyu Duan
Te4+-doped Cs2ZrCl6 vacancy-ordered perovskites with excitation wavelength-dependent tunable color have been synthesised by a simple precipitation method at room temperature, with two luminescent centres originating from the Te4+ and the STE (self-trapping exciton) of the Cs2ZrCl6 itself, respectively. They exhibit two different emission characteristics at 254 nm and 365 nm excitation wavelengths. At an excitation wavelength of 254 nm, the emission characteristics allow Te4+-doped Cs2ZrCl6 to exhibit tunable emission from blue to white to yellow under the control of Te4+ doping. And the excitation wavelength of 365 nm shows yellow emission. Te4+ doped Cs2ZrCl6 phosphors were used for optical anti-counterfeiting, and the anti-counterfeiting patterns were well distinguished under 254 nm and 365 nm UV lamps, demonstrating the potential of this excitation wavelength-dependent tunable color material for optical anti-counterfeiting applications.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Bowen Zha,Shuting Fang,Huiling Chen,Hongyu Guo,Fafu Yang
Although some sensors for Cu 2+ and Zn 2+ had been reported, the sensor with long-wavelength emission in aqueous media for in-situ detecting Cu 2+ and Zn 2+ was always expected. Herein, a biphenylacrylonitrile Schiff-base ( OPBS ) with large aromatic conjugated system was designed and synthesized in yield of 82%. OPBS possessed excellent long-wavelength fluorescence at 550–750 nm in aqueous media, which selectively response to sense Cu 2+ with quenched fluorescence and Zn 2+ with chromotropic fluorescence from red to yellow. The detection of Cu 2+ and Zn 2+ were realized without mutual interference in their coexistence system by means of the assistance of ATP. The detection limits were 2.3 × 10 −7 M for Cu 2+ and 1.8 × 10 −6 M for Zn 2+ , respectively. The sensing mechanism was elucidated by binding MS spectra, fluorescence Job’s plot and 1 H NMR spectra. Moreover, OPBS exhibited good bioimaging performance and the in-situ sensing abilities for Cu 2+ and Zn 2+ in living cells, suggesting the application potential for detecting Cu 2+ and Zn 2+ in both vitro assay and vivo environment.
研究领域:
分析化学
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生物化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Hengjuan Deng,Xinxin Han,Juan Wang,Dongxi Liu,Bingsuo Zou
Near-infrared (NIR) light source technology has been integrated into mobile devices with the advantage of portability to provide efficient analysis in many fields. Among them, NIR light in the 850 nm band has attracted much attention due to its unique advantages. In this study, an ultra-broad NIR emission from 700 to 1100 nm with the peak at 839 nm and full width at half-maximum (FWHM) of 151 nm is achieved in a novel tetra-fluoride RbAlF4:Cr 3+ excited by 465 nm blue light, exhibiting a relatively longer emission wavelength and wider FWHM compared with the reported Cr 3+ -doped fluoride phosphors. In-depth research on its crystal structure reveals that Cr 3+ is in a weak crystal field with a distorted octahedral environment, coupled with a strong electron-phonon coupling effect, which prompts the phosphor to exhibit long-wavelength and broad NIR light characteristics. However, these reasons also lead to relatively moderate internal quantum efficiency and thermal stability. Finally, a NIR phosphor-converted light-emitting diode (NIR pc-LED) was fabricated by combining this phosphor with a commercial blue chip, which shows great potential in non-destructive testing, night-vision observation, and biomedical imaging. This work provides new insights into the design of long-wavelength broadband fluoride phosphors.
研究领域:
材料科学
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光学
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生物医学工程
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Xingping Zhang,Bin Qiao,Yansong Li,Yu Zhou,Hualin Yang
Fluorene, a kind of polycyclic aromatic hydrocarbons (PAHs), was harmful to human health. In this work, a multi-wavelength and multicolor immunoassay was established for detecting fluorene based on the gold nanorods (AuNRs) growth. In the target recognition, fluorene was recognized by monoclonal antibody (McAb) through a competitive immune response. Then, the alkaline phosphatase-labeled Goat anti-Mouse IgG (ALP-IgG) as secondary antibody was used to combine with McAb. In signal output, ALP-IgG was used to catalyze 4-aminophenylphosphate to 4-aminophenol which can reduce Ag(I) to Ag(0). Then, the Ag(0) can deposit on the surface of AuNRs to cause the AuNRs growth. Along with the AuNRs growth, the absorption wavelength of the AuNRs was blue shifted and the color changed accordingly. The linear range of this immunoassay for fluorene was 0.063–4.000 ng/mL with the limit of detection (LOD) of 0.035 ng/mL. This immunoassay had excellent selectivity for fluorene according to the fact that it can distinguish fluorene among 16 PAHs. Meanwhile, this proposed immunoassay had a potential to detect fluorene in different water samples with satisfactory recovery rates (83 %–96 %).
研究领域:
分析化学
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环境科学
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生物技术
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Hui Zhou,Yang Li,Ru Fang,Jinghua Li,Chen Hong,Wen Luo
In this research, an “off–on” long-wavelength fluorescent probe (DCMN-Cl) based on (E)-2-(3-(2-(6-hydroxynaphthalen-2-yl)vinyl)-5,5-dimethylcyclohex-2-en-1-ylidene) malononitrile (DCMN) is designed and synthesized for cysteine (Cys) detection. DCMN-Cl exhibits a large Stokes shift (211 nm) and shows rapid response and high specificity to Cys. The fluorescence initensity at 635 nm reveals a good linear relationship with Cys concentration in the 0 to 50 μM range, and the detection limit is as low as 159 nM. The probe is also used for fluorescence imaging of Cys in cells and mice. Moreover, the probe provided visual evidence of Cu 2+ and curcumin-induced intracellular Cys fluctuations.
研究领域:
生物化学
·
医学检测
·
分子生物学
✓ 已验证
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2021
·
IF 3.867
Ziyao Wang,Jiaxiang Huo,Xuezhu Luan,Shineng Sun,Guofeng Ma
In this work, the feasibility of applying Sr 3 P 4 O 13 :Eu 3+ , a micron phosphor, to latent fingerprint visualization was explored and discussed. The preferential occupancy of Eu 3+ in the host lattice was analyzed based on the bond energy method. The excitation-wavelength-dependent luminescence properties of the phosphor were investigated through the photoluminescence emission and excitation spectra . The phosphor could be pumped effectively by deep ultraviolet and near ultraviolet. The luminescent color of the phosphor could be tuned from reddish orange (0.6025, 0.3939) to yellow (0.4729, 0.5031) with the change of excitation wavelength from 254 nm to 394 nm. The multilevel features of the phosphor-attached latent fingerprint could be identified clearly in deep ultraviolet. The high color contrast between ridge and valley lines provided a splendid condition for the observation. Moreover, the effect of the phosphor used on different substrates for latent fingerprint visualization was explored. All the results reveal that the phosphor was a good potential choice for latent fingerprint visualization.
研究领域:
材料科学
·
法医学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Xue Xing,Weiwei Cao,Zhaoxin Wu,Xiaohong Bai,Jiarui Gao,Xiaozhen Liang,Bo Wang,Chao Wang,Dalian Shi,Linwei Lv,Yonglin Bai
Fluorescence lifetime of phosphors is a critical index in the field of high energy physics and astrophysical detection. A series of ZnS x O 1- x :0.05Ce 3+ phosphors with tunable short fluorescence lifetime were prepared by performing high temperature solid state reaction method. The phosphors exhibited two mixed phases consisting of the hexagonal phase ZnO and the hexagonal phase ZnS. They are spherical and the average particle size is 2.24 μm. As the component content of the ZnS in ZnS x O 1- x :0.05Ce 3+ phosphors varies, the emission wavelength can be tuned from 448 nm to 495 nm, the short fluorescence lifetime can be tuned within the range of 6 μs–200 μs. By performing exponential fitting, we obtained the equation for the variation of fluorescence lifetime of ZnS x O 1- x :0.05Ce 3+ phosphors with ZnS fraction.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jiamin Zhou,Shengduo Xu,Yi Shuai,Qiang Sun,Huangshui Ma,Chao Wang,Haijuan Wu,Shanshan Tan,Zegao Wang,Lei Yang
Broadband photodetectors that can decipher the wavelength (λ) and intensity (I) of an unknown incident light are urgently demanded. Photothermoelectric (PTE) detectors can achieve ultrabroadband photodetection surpassing the bandgap limitation; however, their practical application is severely hampered by the lack of deciphering strategy. In this work, we report a variable elimination method to decipher λ and I of the incident lights based on an integrated Ag2Se film-based PTE detector. Nanostructured Ag2Se films with controlled thickness are synthesized using an ion sputtering of Ag and a room-temperature selenization method and then assembled into a detector. Under identical illumination, Ag2Se films of different thicknesses produce varying output photothermal voltages, influenced by factors including λ. By establishing a direct relationship between the photothermal voltage and the absorption of Ag2Se films of varied thickness, we successfully eliminate variables independent of λ, thus determining λ. Subsequently, I is determined by the calibrated responsivity relationship using obtained λ. Our PTE detector achieves a broadband spectrum from 400 to 950 nm and high accuracy, with deviations as low as ∼2.63 and ∼0.53% for deciphered λ and I, respectively. This method allows for self-powered broadband decipherable photodetection without a complex device architecture or computational assistance, which could boost the research enthusiasm and promote the commercialization of PTE broadband detectors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Gongcheng Xing,Mengxuan Tao,Zhiyu Gao,Shuoting Chen,Song Wang,Guogang Li
In this work, two component substitution types of Si 4+ →[Cs + -Al 3+ ] and [Mg 2+ -Mg 2+ ]→[Cs + -Al 3+ ] were successfully designed in Eu 2+ -doped CsAlSi 2 O 6 pollucite phosphors. The photoluminescence color can be controllably tuned from cyan (513 nm) to blue (437 nm), and full width at half maximum (FWHM) can be adjusted in the region of 79–169 nm. Besides, the thermal stability is obviously improved, where PL intensity at 200 °C increases from 59% (CsAlSi 2 O 6 :5%Eu 2+ ) of the original intensity to 96% [(CsAl) 0.6 Mg 0.8 Si 2 O 6 :5%Eu 2+ ] and 86% [(CsAl) 0.9 Si 2.1 O 6 :5%Eu 2+ ], respectively. The corresponding mechanisms of spectral adjustment and thermal stability enhancement were investigated. The proposed strategies can play a key role in exploiting novel and efficient phosphors for high-power w-LEDs lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
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