PHOTOSYNTHESIS RESEARCH
·
2023
·
IF 3.7
Su Pengfei,Ding Shuangshuang,Wang Dacheng,Kan Wenjie,Yuan Meng,Chen Xue,Tang Caiguo,Hou Jinyan,Wu Lifang
Different light spectra from light-emitting diodes (LEDs) trigger species-specific adaptive responses in plants. We exposed Artemisia argyi ( A. argyi ) to four LED spectra: white (the control group), monochromatic red light (R), monochromatic blue light (B), or a mixture of R and B light of photon flux density ratio is 3 (RB), with equivalent photoperiod (14 h) and light intensity (160 μmol s −1 m −2 ). R light accelerated photomorphogenesis but decreased biomass, while B light significantly increased leaf area and short-term exposure (7 days) to B light increased total phenols and flavonoids. HPLC identified chlorogenic acid, 3,5-dicaffeoylquinic acid, gallic acid, jaceosidin, eupatilin, and taxol compounds, with RB and R light significantly accumulating chlorogenic acid, 3,5-dicaffeoylquinic acid, and gallic acid, and B light promoting jaceosidin, eupatilin, and taxol. OJIP measurements showed that B light had the least effect on the effective quantum yield ΦPSII, with higher rETR(II), Fv/Fm, qL and PIabs, followed by RB light. R light led to faster photomorphology but lower biomass than RB and B lights and produced the most inadaptability, as shown by reduced ΦPSII and enlarged ΦNPQ and ΦNO. Overall, short-term B light promoted secondary metabolite production while maintaining effective quantum yield and less energy dissipation.
研究领域:
植物学
·
药用植物研究
·
光生物学
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Guo-Qiang Li,Zheng-Yang Huo,Qian-Yuan Wu,Yun Lu,Hong-Ying Hu
An ultraviolet (UV)-based advanced oxidation process (AOP) for disinfecting water is introduced in this paper. This study aimed to evaluate the potential of UV light-emitting diodes (UV-LEDs)/chlorine AOP (UV/Cl 2 ) for Bacillus subtilis spore inactivation. Chlorine was combined with 265 and 280 nm LEDs (UV 265 /Cl 2 , UV 280 /Cl 2 ) and investigated. The addition of 4.0 mg/L of free chlorine at pH 7.0 in the presence of 125 mJ/cm 2 of UV irradiation resulted in an additional 1.8-log reduction in UV 265 /Cl 2 and 1.5-log reduction in UV 280 /Cl 2 . There was no observed enhancement in spore inactivation with the addition of a radical scavenger, t-BuOH, which indicated the role of • OH in the synergistic effect. To quantitatively evaluate the synergism, the primary treatment with UV/Cl 2 was followed by further UV or Cl 2 treatment. After UV/Cl 2 pretreatment at different pH levels, the 265 and 280 nm LEDs treatment enhanced an approximate 0.4–0.5-log reduction compared to UV only, and Cl 2 treatment enhanced an approximate 0.7–1.1-log reduction compared to Cl 2 only. In addition, at pH 7.0, in UV 265 /Cl 2 -Cl 2 and UV 280 /Cl 2 -Cl 2 , the inactivation rate constant k increased by approximately 2 and 1.5 times, respectively. The CT for the lag phases ( CT lag ) reduced to approximately 67 and 58%, respectively. Similar results were obtained at pH 7.5 and 8.0, and in the secondary effluent. The synergistic effect on spore inactivation suggested that the pathogen inactivation efficiency of sequential UV and chlorine disinfection processes, which are commonly applied, can be significantly enhanced by adding chlorine prior to UV treatment .
研究领域:
微生物学
·
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Haonan Yu,Jingming Chan,Balaji Devakumar,Xiaoyong Huang
High-efficiency far-red emitting phosphors with an emission peak of around 730 nm are urgently needed for indoor plant growth light-emitting diode (LED) lighting. In this article, we report on the synthesis, crystal structure, and luminescence properties of a new highly efficient Mn 4+ ion-activated Li 3 La 3 W 2 O 12 (LLWO) far-red emitting phosphor. A group of LLWO:Mn 4+ phosphors doped with different Mn 4+ ion concentrations have been prepared via the conventional high-temperature solid-state reaction route. X-ray diffraction Rietveld refinement reveals that the LLWO:Mn 4+ phosphor has the monoclinic structure with space group P2 1 /n , along with lattice parameters of a = 5.5396 Å, b = 5.6026 Å, c = 7.8802 Å, α = γ = 90°, β = 90.0988°, and V = 244.57 Å 3 . Interestingly, LLWO:Mn 4+ phosphors can generate bright narrowband far-red emission in the 650–800 nm wavelength range peaking at 719 nm due to the spin- and parity-forbidden 2 E g → 4 A 2g transition of Mn 4+ ions, matching well with the absorption spectrum of phytochrome P FR . The excitation spectrum monitored at 719 nm has a broad excitation band with the range from 250 to 550 nm centered at 339 nm and 472 nm, indicating that LLWO:Mn 4+ phosphors could be efficiently pumped by both ultraviolet and blue LED chips. The highest far-red emission is achieved for the sample doped with 1.2 mol% Mn 4+ ion, and this optimal LLWO:1.2%Mn 4+ sample shows a high internal quantum efficiency of 88.4% and a decay lifetime of 2.289 ms. Commission Internationale de l’Eclairage (CIE) color coordinates of LLWO:1.2%Mn 4+ are determined to be (0.7326, 0.2674). Besides, the crystal field analysis and temperature-dependent emission spectra of the as-prepared samples have been investigated in detail. The emission intensity of LLWO:1.2%Mn 4+ sample at 423 K remains about 40% of that at 303 K. Finally, a LED device is fabricated by integrating the LLWO:1.2%Mn 4+ phosphors and a 460 nm blue LED chip, which shows bright blue and far-red dual emission bands under 20–300 mA driving currents. This work demonstrates that these newly developed far-red emitting LLWO:Mn 4+ phosphors have excellent application prospects in plant growth LED lighting.
研究领域:
材料科学
·
园艺学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Qiwei Li,Yu Lu,Yang Li,Kui Pan,Liying Deng,Chang Lin,Kaixin Zhang,Jie Sun,Qun Yan,Tailiang Guo
Micro-LED display has risen to prominence in research and industry, distinguished by their numerous advantages. Quantum dots (QDs) film, serving as color conversion layers (CCLs) for Micro-LED, are considered a leading candidate for the next generation of displays, owing to their low power consumption and broad color gamut. Inkjet printing stands out as a feasible approach for crafting QDs CCLs. The essence of the process hinges on attaining a printed QDs film that boasts both uniformity and high-precision QDs array. However, the unstable printing of QDs ink significantly impacts the surface morphology of QDs arrays and the display performance of Micro-LEDs. Therefore, elucidating the mechanism behind the unstable printing of QDs in inkjet printing and fabricating QDs is of paramount importance. In this study, through the simulation of unstable printing with conventional QDs ink, we identified nozzle blockage and the rapid evaporation of low-boiling-point ink as the primary causes of unstable printing. This leads to aggregation and deposition of QDs, obstructing the nozzle and altering the fluid path. A novel binary organic composite ink was employed to print the QDs array on the substrate with ultra-stability, achieving a high yield and greatly reduced coffee-ring effect Micro-LED full-color display.
研究领域:
材料科学
·
显示技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Changfu Xu,Yan Yuan,Haiyan Shi,Minchun Lin,Yuan Tang,Zhaoqi Liu,Nian Pan,Xiaohong Zhang,Pengbo Lyu,Lizhong Sun
Capturing both structural and pigmented iris textures is essential for accurate identity authentication and medical testing, particularly for heavily pigmented irises. Traditional near-infrared (NIR) lighting captures only structural details, while multiwavelength LEDs capture both but hinder device miniaturization. We present a solution using a phosphor-converted LED (pc-LED) that emits both visible and NIR light, combining commercial CaAlSiN3:Eu2+ and Ca3LuAlGe3O12:Cr3+ phosphors. This compact lighting source improves the emission efficiency and thermal stability through Lu3+ substitution with Al3+, allowing for the capture of clear iris images that reveal both structural and pigmented textures. Our results highlight the potential of visible and NIR pc-LEDs to enhance iris biometrics for portable devices and reduce the cost of iris medical testing equipment.
研究领域:
光学工程
·
生物识别技术
·
医学成像
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Xiaobing Ju,Xiuyuan Hu,Yanjing Gao,Jun Nie,Fang Sun
This work reports two hydrogen donor-containing naphthalimide benzyl thioether photoinitiators (NBT-HD1 and NBT-HD2), combining characters of one-component and two-component photoinitiators, for LED photopolymerization . They have good absorptions at emission wavelengths of LED and their ɛ max are more than or close to 1 × 10 4 M −1 cm −1 . Both photoinitiators can generate radicals having initiating ability through not only the cleavage of C S bonds, but also intermolecular hydrogen abstractions themselves under 405 nm LED irradiation. NBT-HD2 with acryloyl group presents an excellent capability of reducing oxygen inhibition. Moreover, NBT-HD1 or NBT-HD2/iodonium salt can trigger the cationic photopolymerization of the epoxide under 405 nm LED irradiation. More significantly, NBT-HD2 with acryloyl group exhibits a prominent migration stability in the polymer film and has broad application prospects in the field of food packaging and biomaterials.
研究领域:
材料科学
·
化学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 19
·1-14
·
IF 2.8
Yin Honglei,Ge Wanyin,Tian Ye,He Peng,Zhang Qian,Xie Xin
Phosphors play an extremely important role in solid-state lighting and full-color displays. Recently, it has been observed that their properties can be extensively utilized in the field of anti-counterfeiting. For the study of innovative anti-counterfeiting materials, the selection of high-quality matrix materials is indispensable. In this work, green AlN:Eu 2+ phosphors are synthesized by the direct nitriding method, and their physical structure, micro-morphology, elemental composition, and photoluminescence properties are systematically investigated at different synthesis temperatures and doping concentrations. The results show that the peak emission of AlN:0.05Eu 2+ occurs at 525 nm at a synthesis temperature of 1400 °C, and the fluorescence intensity retains 53.5% of its room temperature value when the test temperature is increased to 110 °C. The synthesized phosphors are dispersed in thermoplastic polyurethane (TPU) to create a UV-excited, flexible anti-counterfeiting film. The AlN:Eu 2+ @TPU anti-counterfeiting film exhibits excellent light transmission, flexibility, stretchability, and water resistance. When a current of 50 mA is applied, the green LED encapsulated with AlN exhibits high color purity. The CIE coordinates of the white LED are (0.32, 0.34), with a relevant color temperature (CCT) of 5727 K and a color rendering index (Ra) of 85.9. Overall, the results suggest that AlN:Eu 2+ phosphors possess significant potential for realizing multidimensional applications in lighting displays and anti-counterfeiting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Jiaqi Wang,Yuanhang Li,Xiaotong Li,Jiangbo Pan,Di Wang,Shuangying Wei,Chengyu Wang,Jian Li
Biological macromolecules had been studied as ligands in recent years, which not only give the complexes excellent polymer properties, but also have many advantages such as biodegradability. Carboxymethyl chitosan (CMCh) is excellent biological macromolecular ligand because of its abundant active amino and carboxyl groups, and it can smoothly transfer energy to Ln 3+ after coordinating. To further study the energy transfer mechanism of CMCh-Ln 3+ complexes, CMCh-Eu 3+ /Tb 3+ complexes with different Eu 3+ /Tb 3+ ratios were prepared by using CMCh as a ligand. The morphology, structure, and properties of CMCh-Eu 3+ /Tb 3+ were characterized and analyzed by infrared spectroscopy, XPS, TG and Judd-Ofelt theory, thus the chemical structure of CMCh-Eu 3+ /Tb 3+ was determined. The mechanism of energy transfer was explained in detail, also the Förster resonance transfer model is confirmed, and the hypothesis of energy transfer back was verified by the characterization and calculation methods of fluorescence spectra, UV spectra, phosphorescence spectra and fluorescence lifetime. Finally, CMCh-Eu 3+ /Tb 3+ with different molar ratios were used to prepare a series of multicolor LED lamps, and it extends the application range of biological macromolecules as ligands.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Na Sun,Xianglian Wang,Zhanmeng Liu
In this study, electrochemically generated free chlorine (EC/Cl2) was activated by UV irradiation with a light emitting diode (LED) lamp at 275 nm to degrade acetaminophen (AAP, 2 μM) in aqueous solution. The potential at a RuO2-IrO2/Ti plate anode was set at 1.5 V vs. the Ag/AgCl electrode. Chlorine was in situ generated in the presence of Cl杴 at the anode and then it was transformed into various active species such as 晑OH and reactive chlorine species (RCS) under UV-LED irradiation. The degradation of AAP was investigated using batch tests, evaluating the influence of different experimental conditions such as NaCl concentration, phosphate buffer saline concentration, irradiation time and solution pH, keeping constant the UV-LED power and temperature. Results show that AAP could be completely degraded by the hybrid process with a high mineralization ratio (73%), and the degradation process followed a pseudo-first-order kinetics. The value of the Electric Energy per Order (EEO) = 1.272 kWh m杴3 order?, which is lower than the energy consumption of some other UV-based processes for AAP degradation. Adding 1 mM HCO3杴 ions slightly decreased the rate of AAP degradation. Luminescent bacteria experiment revealed that the acute toxicity of the reacted solution could be greatly reduced and the ecological risk was effectively abated. The scavenging assay shows that RCS plays a key role in the AAP degradation. The intermediate products were identified, and possible degradation routes were proposed. The system can advantageously replace conventional UV mercury lamp based ones in the degradation of microorganic pollutants.
研究领域:
环境科学
·
水处理工程
·
光催化降解
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Shaojin Ma,Yongyu Li,Yankun Peng,Sen Nie,Xue Bai,Jincheng Zhang
An accurate yet rapid assessment of pungency and color values is pivotal for the commercial processing of pepper, underscoring the critical need for high-throughput detection techniques. This study investigates a rapid method for determining the pungency and color value of paprika via LED–induced fluorescence spectroscopy. A simultaneous detection instrument was developed with a proposed fluorescence correction method to reduce the impact of excitation light reflected by the sample. The corrected spectra could improve the performance of pungency prediction. The best pungency model achieved a R c 2 of 0.941, R cv 2 of 0.935, RMSEC of 6813.41 SHU and RMSECV of 6959.97 SHU. The best color value model achieved an R c 2 of 0.862, R cv 2 of 0.822 RMSEC of 1.233 and RMSECV of 1.402. This study offers a practical solution for simultaneous quality assessment suitable for industrial deployment, with the potential to extend this methodology to diverse cultivars.
研究领域:
食品科学
·
分析化学
·
光谱学
·
农业工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 7
·2197-2205
·
IF 7
Siyu Guo,Ligan Ma,Muniran Abudureyimu,Rongfei Wei,Fumin Lu,Fangfang Hu,Hai Guo
Near-infrared (NIR) spectroscopy has garnered substantial attention owing to its diverse merits and widespread applications. Meanwhile developing phosphors with broadband and efficient NIR emission is still an enormous challenge for constructing NIR light sources. Herein, enhanced and broadened NIR luminescence of Gd2−xAlxGaSbO7 (G2−xAxGSO):y%Cr3+ phosphors can be realized via modifying the crystal field environment of Cr3+ induced by Al3+ → Gd3+ cation substitution. Upon blue light irradiation, G1.4A0.6GSO:4%Cr3+ exhibits a broadband luminescence ranging from 650 to 1000 nm with a full width at half maximum (FWHM) of 136 nm, excellent thermal stability, and a tiny chromaticity shift. Through incorporating the resulting powders into a blue light-emitting diode (LED) chip, a NIR phosphor-converted (pc) LED with a high output power of 62.99 mW and a photoelectric conversion efficiency of 13.38% was manufactured. The fabricated pc-LED shows application potential in nondestructive food analysis. These findings confirm that the as-synthesized G2−xAxGSO:Cr3+ phosphor is a promising candidate for application in NIR pc-LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 5
·585
·
IF 3.236
Wen Sun,Xuankun Li,Jingtao Zou,Han Guo
TiO2is widely used for the photocatalytic degradation of organic pollutants in wastewater, but the practical applications of the photocatalyst are limited due to its poor visible light absorption and low recovery rate. In this study, high production of nitrogen-doped TiO2was achieved by a hydrolysis precipitation method; the obtained N-TiO2had a small crystallite size and good dispersibility. The effect of calcining temperature on the photocatalytic performance of N-TiO2was evaluated through the degradation of methylene blue (MB) in a blue light LED irradiation cylinder, it was found the N-TiO2calcined at 400 °C showed the best photocatalytic activity. Then the N-TiO2was immobilized on SiC ceramic foam by dip-coating with PVA as the binder. The prepared N-TiO2/SiC foam showed excellent photocatalytic activity under blue light LED irradiation; as high as 96.3% of MB was degraded at optimum conditions. After five cycles of MB photodegradation, the photocatalytic activity of N-TiO2/SiC foam only changed slightly, which makes it a promising photocatalytic material for wastewater treatment.Keywords:nitrogen-doped TiO2;SiC foam;LED irradiation;photodegradation;methylene blue
研究领域:
环境科学
·
材料科学
✓ 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）