JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zecheng Cao,Xiaojiao Kang,Wei Lü,Weiliang Guan
In this study, we present a novel synthesis system for AgInS 2 /ZnS (AIS/ZnS) core/shell quantum dots (QDs) terminated with carboxymethyl chitosan (CMC) as a ligand, which has not been previously documented. By varying the Ag/In ratio, we achieved emission wavelengths ranging from 590 to 697 nm, with the maximum photoluminescence quantum yield (PLQY) of 33.1 %. The synthesized AIS/ZnS QDs powder was mixed with YAG phosphor and combined with a blue gallium nitride (GaN) chip to produce a warm white light-emitting diode (WLED), resulting in the color rendering index (CRI) increase from 74 to 82 and the correlated color temperature (CCT) decrease from 6486 K to 3873 K. Additionally, the AIS/ZnS QDs powder can be directly utilized with a blue GaN chip to create a near-infrared light-emitting diode (NIR-LED) capable of night vision. By adjusting the concentration of CMC in the AIS/ZnS QDs solution, the material can be directly used for writing and screen printing, or dried to obtain a highly transparent and luminescent flexible composite film. This research demonstrates the significant potential of CMC-ligated AIS/ZnS core/shell QDs in display technologies and flexible device applications.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ze-Chen Gao,Yi-Li Lin,Bin Xu,Ying Xia,Chen-Yan Hu,Tong-Cheng Cao,Xiang-Yun Zou,Nai-Yun Gao
This study revealed the iopamidol degradation performance and the synergistic effect of dual-wavelength ultraviolet light-emitting diodes (UV-LEDs). It was found that the dual-wavelength irradiation (265 and 280 nm) can promote iopamidol degradation during both UV-LED alone and UV-LED/chlorine processes ( p < 0.05). The effects of key experimental parameters including pH, chlorine dosage and water matrix during UV-LED/chlorine process were evaluated. Peak degradation rate was observed at pH 7.0 due to the combined effects of the quantum yield of aquatic chlorine photolysis (Φ chlorine ) and absorptivity of chlorine. The destruction pathways of iopamidol in the UV-LED/chlorine process were proposed by Ultra Performance Liquid Chromatography-Electrospray Ionization-mass spectrometry. Additionally, an opposite trend of iodinated trihalomethane (I-THM) formation during subsequent chlorination between Milli-Q and real waters with prolonging irradiation time was observed, while other detected disinfection by-product (DBP) formation showed the same variation in Milli-Q and real waters. The UV-LED/chlorine treatment using dual-wavelength can enhance iopamidol degradation significantly, but it also promoted I-THM formation in real water, indicating the need for evaluating DBPs before the application of UV-LED/chlorine process in drinking water treatment.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
·
2019
·
IF 1.433
Sangmin Lee,Jaebum Son,Dong Geon Kim,Joonbum Choi,Yong Kyun Kim
Production of plastic scintillators using 3D printing technology has gained increased interest, and related researches are being published. However, research results show that the performance of plastic scintillators, such as light yield or decay time, is still poor compared to that of commercial products. In order to improve the scintillator performance, a UV-curable solution was prepared by applying ADS148BE, a new wavelength shifter, from which a plastic scintillator was fabricated using a UV LED curing machine. The maximum emission wavelength of the prepared scintillator occurred at 429 nm. The transmittance at peak emission was 49%. The scintillation efficiency was measured to be 43% of BC408 (Saint-Gobain Crystals). The light yield was determined to be 35% of BC408. It is about 1.9 times better than that of a scintillator fabricated by a UV lamp of a previously published paper [12]. The light output was estimated as 33.7% of BC408. The decay time was approximately 2.46 ns. This is the relative value measured after setting the decay time of the reference scintillator to match the manufacturer’s data. Compared to the UV-curable plastic scintillator of previously reported studies, we have improved the overall performance of our sample and will be able to make precise shapes with a 3D printer.
研究领域:
材料科学
·
核技术
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2020
·Vol. 15
·期 5
·1-12
·
IF 4.053
Li Xinzheng,Li Zhiming,Xing Zhihui,Song Zhimin,Ye Bei,Wang Zhengming,Wu Qianyuan
In this work, LED-based photocatalysis using mixed rutile and anatase phase TiO 2 (P25) as the photocatalyst could effectively remove 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT) and methylisothiazolone (MIT) simultaneously, with removal efficiencies above 80% within 20 min. The photocatalytic degradation of both CMIT and MIT could be modeled using a pseudo-first-order rate equation. The photocatalytic degradation rates of CMIT and MIT under LED280 illumination were higher than under LED310 or LED360 illumination. At concentrations below 100 mg/L, the degradation rate of CMIT and MIT under LED illumination significantly increased with increasing catalyst dosage. Additionally, the effects of the chloride ion concentration, alkalinity and dissolved organic matter on the photocatalytic degradation reaction were also investigated. The ·OH free radicals were determined to play the primary role in the photocatalytic degradation reaction, with a degradation contribution of >95%. The photocatalytic degradation of CMIT and MIT mainly occurred via oxidation, hydrolysis, and chain growth reactions. Finally, the possible photocatalytic degradation pathways of CMIT and MIT over LED/P25 are proposed.
研究领域:
环境科学
·
化学工程
·
生物学
✓ 已验证
DOI
高影响因子
Insects
·
2020
·Vol. 11
·期 2
·94
·
IF 2.22
Jihong Zhang,Huyin Li,Maorong Liu,Huan Zhang,Hai Sun,Hongtuo Wang,Lin Miao,Miaomiao Li,Ruihao Shu,Qilian Qin
Population control of small sucking insects has been challenging, and alternative control methods are constantly being sought. Visual traps have long been used to monitor and control pests. Colored sticky cards are widely used for diurnal pests, but their effects are influenced by environmental light conditions. Artificial light traps are mostly used for nocturnal pests. Here, we explored and evaluated light-emitting diode (LED) traps for the monitoring and control of small diurnal sucking insects using greenhouse tests targeting the greenhouse whiteflyTrialeurodes vaporariorum. We tested the trapping efficacy of the LED water pan trap, assessed the most attractive LED light and analyzed its efficacy under different weather conditions. The results showed that the LED water pan trap was too inefficient to be useful. Green LEDs were more attractive than yellow LEDs, UV LEDs and green-UV combinations. Regardless of sunny or cloudy conditions, the green LED trap caught more than twice the number of whiteflies than the yellow sticky card alone under summer shading conditions. Our study suggests that LED traps have a significant field application value in whitefly mass trapping and may also be efficient for other diurnal insects. The design of LED traps specific for diurnal insects is discussed.
研究领域:
昆虫学
·
农业科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
·
2018
·
IF 1.333
Tiezhu Guo,Xiaodan Lin,Xingsong Hu,Shaowei Cui,Xiaolian Chen
Zirconium containing phenyl silicone resin were synthesized through hydrolysis among zirconium n-propoxide (ZP), diphenyldimethoxysilane, and 3-(trimethoxysily)propyl methacrylate under acidic conditions. The results indicated that the resins have favorable thermal stability for practical usage, and the thermal weightless of all resins are less than 3% under 200°C.The refractive index of the materials is positively correlated with zirconium content, and tunable between 1.57 and 1.59, and light transmittance does not change significantly with the increase of zirconium element. In addition, the resins can be stably stored for more than 6 months without any effect on the application.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Shufang Wu,Yushu Zhang,Zhiquan Li,Xiaoxuan Liu,Yusuf Yagci
A metal-free approach to visible-light LED-induced atom transfer radical polymerization (ATRP) using oligopyrene as a photocatalyst is reported. The method facilitates the polymerization of various vinyl monomers, yielding polymers with molecular weight distribution as low as 1.32 and controlled chain-end functionality. Light on/off experiments demonstrate the light-dependent nature of the polymerization, confirming the effectiveness of the oligopyrene/alkyl halide system. The presented strategy paves the way for future advancements in polymer science, offering a metal-free alternative for controlled polymerization under visible light irradiation.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 10
·1382
·
IF 2.67
Xinhua Chen,Qingliang Xu,Fayaz Hussain,Chen Yang,Weiqin Sheng,Xinjiang Luo,Bing Liu,Shikuan Sun,Dawei Wang,Kaixin Song
Red LEDs with a high color purity and high color rendering index are often used to compensate for the lack of red-light components in current white LEDs. Therefore, the new type of garnet-structured high color purity red phosphor Y2−xSrAl4SiO12: xEu3+was synthesized by the solid-state method. The band gap structure of the host matrix was studied through the DFT calculation and found that the matrix belongs to a direct band gap structure with a band gap size of 4.535ev. The phosphor exhibits a wide excitation spectrum under the monitoring of 710 nm. The strongest excitation wavelength is 393 nm, and it exhibits bright red light under the excitation of 393 nm, and the emission peak positions are located at 570 nm, 597 nm, 613 nm, 650 nm, 710 nm and 748 nm, respectively, which are attributed to the5D0→7Fjof Eu3+(j = 0–5) electronic transitions. In the crystal structure of Y2SrAl4SiO12, Eu3+occupies a symmetry site. The compositional changes and thermal studies found favorable at 20% mol. At this concentration, the luminescence intensity gradually weakened due to the Eu3+electric multi-level interaction. It is worth noting that the emission intensity of Y2SrAl4SiO12: 20%Eu3+at 433 K can be maintained to 92% of that at 293 K. Finally, we combined it with the NUV chip and packaged it into a red LED with a color purity of up to 90% and a correlated color temperature of 1492 K. The high purity, low color temperature and thermal stability indicate that it has a place in LED applications.
研究领域:
材料科学
·
光学工程
·
固体化学
·
半导体物理
·
发光材料
·
照明技术
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Ruihan Xiong,Zhuojun Lu,Qian Tang,Xueling Huang,Huazhen Ruan,Wei Jiang,Yiqun Chen,Zizheng Liu,Jianxiong Kang,Dongqi Liu
This study reports on the propranolol (PRO) degradation performance and product toxicity of an ultraviolet light-emitting diode (UV-LED)/chlorine process. The effects of experimental parameters including solution pH, chlorine dosage, and water matrix constituents on PRO removal were evaluated. Up to 94.5% of PRO could be eliminated within 15 min at a PRO-to-chlorine molar ratio of 1:4. The overall removal efficiency of PRO was non-pH dependent in the range of 5–9, while the initial rate was accelerated under alkaline conditions. The presence of Cl − /HCO 3 − had little influence on the PRO degradation, whereas either humic acid or NO 3 − had an obvious inhibitory effect. Radical scavenger experiments showed that both HO and Cl primarily contributed to the PRO degradation, and electron paramagnetic resonance data demonstrated the generation of 1 O 2 . The transformation of PRO during this process led to five detected products, which exhibited a higher acute toxicity than the parent compound according to the bright luminescent bacillus T3 method. It is worth mentioning that under the same ultraviolet illumination intensity, the degradation of PRO under UV-LED/chlorine gave a better performance than UV 254 /chlorine, but the EEO of the former is obviously higher than the latter. So further research is required on improving the electric current to photon conversion efficiency for UV-LED. Additionally, the UV-LED/chlorine system was effective in the degradation of other drugs including sulfamethoxazole, oxytetracycline hydrochloride, and gatifloxacin, suggesting the possible application of the UV-LED/chlorine process for the removal of pharmaceuticals during wastewater treatment .
研究领域:
环境科学
·
毒理学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2017
·Vol. 94
·期 1
·179-185
·
IF 2.121
Heng Zhang,Shupeng Liu,Xiangfei Yang,Na Chen,Fufei Pang,Zhenyi Chen,Tingyun Wang,Jianshe Zhou,Fuji Ren,Xiaoyin Xu,Taihao Li
Tiny but highly efficient, a light-emitting diode (LED) can power a therapy device, such as a phototherapy device, and, at the same time, decrease the device's size requirements. In this study, a LED phototherapy device was designed to investigate the possible impact on wound healing using a mouse model and a cell line exposed to red and blue light. To enhance wound phototherapy, a gelatin sponge was fabricated. Results showed that the red and blue lights promoted cell growth and wound healing, while the blue light with a gelatin sponge protected the wound from infection in the early stages of wound healing. The LED phototherapy device combined with the gelatin sponge, therefore, has potential significance in clinical application for wound healing.
研究领域:
生物医学工程
·
细胞生物学
·
创伤修复研究
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Weifeng Ma,Wei Jia,Yanjing Gao,Fang Sun
In this study, we designed and synthesized four α-ketone aryl thioesters photoinitiators ( PTEs ) with excellent cytocompatibility for LED photopolymerization using a simple one-step reaction. We investigated the potential photopolymerization initiation mechanisms of PTEs under 405 nm LED irradiation through ultraviolet–visible absorption spectroscopy, high-resolution mass spectroscopy, and electron spin resonance. Our findings revealed that PTEs can effectively initiate the photopolymerization of acrylate monomer tripropylene glycol diacrylate (TPGDA) under either 405 nm or 455 nm LED irradiation, achieving double bond conversions of approximately 80 % or higher after 180 s of irradiation. Remarkably, compared to the commercial photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) and benzoyl methacrylate (MBF), PTEs exhibit certain advantage in initiating photopolymerization of triethylene glycol dimethacrylate (TEGDMA) widely used for dental materials under the irradiation of 405 nm. More importantly, MO-PTE has better cytocompatibility compared to TPO and exhibits a great potential in the fields of LED photopolymerization, biomaterials and food packaging.
研究领域:
材料科学
·
高分子化学
·
生物医学工程
·
牙科材料
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Wenkai Zhang,Chaoyong Deng,Min Zhang
Dy 3 + doped Gd 2 MgTiO 6 (GMT) phosphors were were fabricated using the high temperature solid state method in this study. Fluorescence, UV-visible spectrometer, X-ray photoelectron spectrometer, and Transient fluorescence spectrometer. The results show that the structures of the series of phosphors belong to the monoclinic crystal system, and Dy 3 + was successfully incorporated into the GMT host without affecting its structure. The samples emitted extremely strong blue and yellow light, which are the transitions derived from 4 H 9 / 2 to 6 H 15 / 2 (482 nm) and 6 H 13 / 2 (575 nm) levels, respectively. The sample shows obvious effects of concentration, GMT: 0.11Dy 3 + phosphor has the best photoluminescence (PL) intensity 7.148 × 10 5 , lifetime is 0.16 ms, and an internal quantum efficiency (IQE) is 2.1 % . The Dy 3 + doped sample has a larger energy band gap of 4.11 eV. The prepared samples exhibit color coordinates in proximity to that of standard white light, which indicates that the phosphor GMT: Dy 3 + can be applied to white light phosphors and light-emitting diode (LED) devices.
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）