PROGRESS IN ORGANIC COATINGS
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2022
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IF 6.206
Zhaoxian Tang,Yanjing Gao,Shengling Jiang,Jun Nie,Fang Sun
In this work, four ethyl cinnamoylformate derivatives photoinitiators (ECFs), which have good photobleaching ability and excellent cytocompatibility in LED-triggered photopolymerization , were designed and synthesized by a simple two-step reaction. The potential initiating and photobleaching mechanisms of ECFs under visible LED were researched by ultraviolet−visible absorption spectroscopy , nuclear magnetic resonance, high−resolution mass spectroscopy and electron spin resonance . The as-prepared photoinitiators ethyl p-methoxycinnamoyl formate (O-ECF) and ethyl p -methylmercaptocinnamoyl formate (S-ECF) exhibited much higher initiating rate under 405 nm and 455 nm LED compared to the commercial photoinitiator 2-isopropylthioxanthone (ITX). More significantly, carbon‑carbon double bonds of ECFs can polymerize in the presence of tertiary amine under the irradiation of 455 nm or 405 nm LED, which endows ECFs with good photobleaching performance and excellent migration stability and cytocompatibility. Furthermore, ECFs are able to greatly initiate deep-layer photopolymerization under 455 nm LED and the photopolymerization depth reached 7.0 cm after the irradiation for 20 min. This work also affords a new perspective for designing photoinitiators with good photobleaching performance.
研究领域:
材料科学
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化学
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高分子科学
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生物医学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2022
·Vol. 10
·期 27
·9989-10000
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IF 8.067
Yixuan Guo,Damien Boyer,Federico Cisnetti,Anthony Barros,François Reveret,Yongjun Feng,Geneviève Chadeyron,Fabrice Leroux
Perylene diimide-based dyes substituted by four sulfonate groups at their bay position are known to be extremely sensitive to their mutual π–π intermolecular interaction. They do not emit fluorescence in solid state. When co-hosted in LDH with a surfactant in extremely small quantities, an absolute photoluminescence quantum yield (PL QYabs) of about 35% is reached upon blue excitation at 465 nm for a dye content as low as 0.1% of the total interleaved anions and yet revealing the presence of excimers. When this material is dispersed in silicone, the emission spectrum exhibits a blue shift compared to the hybrid assembly. A saturated red color with PL QYabs as high as 50% is obtained. When this red-emitting film is combined with a YAG/Ce silicone film and a blue LED chip emitting at 465 nm, warm white light (T = 3366 K) with a high color rendering index of 91.4 is produced. Finally, the phosphors hosted in LDH are photo-stable even when dispersed in a silicone matrix, with emission properties that do not suffer any decrease in intensity under combined thermal and photonic stresses, thus opening up real possibilities for applications in LED technology.
研究领域:
材料科学
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光电技术
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光子学
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化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Lin Liu,Shanshan Peng,Lei Fu,Yuxuan Guo,Xia Sun,Liang Song,Junpeng Shi,Yun Zhang
Since the strong blue light from the conventional blue chip has negative effects on human health, near-ultraviolet (n-UV) white light-emitting diodes (W-LEDs) have been widely studied. However, the photoluminescence spectrum generated by tricolor (blue, green, and red) phosphors contains a notable cavity in the deep-blue region (400–430 nm), which reduces the color quality. In this work, we report a novel series of narrow-band deep-blue-emitting phosphors with strong n-UV excitation, Ln2Si2O7:Bi3+ (Ln = Gd, Y, Lu, Sc), and realize the tuning of emission from 422 to 403 nm via cationic substitution, which bridges the deep-blue gap. All of these phosphors are effectively excited by n-UV radiation at approximately 370 nm and exhibit narrow-band deep-blue emission with a full width at half-maximum (FWHM) < 50 nm. Among them, Sc2Si2O7:Bi3+ generates 403 nm deep-blue emission with a 38 nm FWHM under 372 nm n-UV excitation, with high luminescence intensity and excellent thermal stability. Finally, 365 nm n-UV-pumped phosphor-converted (pc) W-LED devices are fabricated by combining Sc2Si2O7:Bi3+ and commercially available phosphors, and they have a high color-rendering index (Ra) of 95.4 and a low correlated color temperature (CCT) of 3736 K. This result suggests that these phosphors have potential applications in full-spectrum warm white lighting.
研究领域:
材料科学
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光学工程
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照明技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Denan Mu,Jinfeng Xing
Double network hydrogel with excellent mechanical properties is a polymer material composed of interpenetrating polymer network structure. In this study, poly(acrylamide-co-acrylic acid)/sodium alginate (P(AAM-co-AAC)/SA) hydrogels were rapidly prepared by photopolymerization under green LED irradiation. Subsequently, poly(acrylamide-co-acrylic acid)/sodium alginate/tannic acid (P(AAM-co-AAC)/SA/TA) hydrogels were prepared by immersion method. The morphology, mechanical properties, the wet adhension ability and swelling behaviour morphology of P(AAM-co-AAC)/SA/TA hydrogels were studied in detail. The double network hydrogel has excellent mechanical properties, with the elongation at break and tensile strength reaching 862% and 0.77 MPa respectively. The hydrogel with tannic acid showed excellent adhesion, wet adhesion and anti-swelling capability. Our research provides a more efficient and environmentally friendly preparation method for hydrogels used in wet environment.
研究领域:
材料科学
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高分子化学
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生物医学工程
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2020
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IF 3.465
Wanhe Qi,Songming Zhu,Abubakar Shitu,Zhangying Ye,Dezhao Liu
Under Minamata Convention restrictions, mercury-free UV source was in need for ultraviolet disinfection in recirculating aquaculture systems (RAS). Ultraviolet emitting diodes (UV-LEDs) seemed a potential mercury-free UV source and had gained increasing attention in water disinfection. In this study, a mercury-free UVA-LED and low concentration peroxymonosulfate (PMS) combination was proposed for E. coli (CGMCC 1.3373) inactivation and real RAS wastewater disinfection. Results showed that UVA-LED and low concentration PMS combination enhanced E. coli inactivation over UVA-LED alone. A synergistic effect on E. coli inactivation with synergy factor of 58.7 % was found when combining UVA-LED irradiation with 1 mg/L PMS. Kinetic rate constant increased by up to 139 % by UVA-LED and 1 mg/L PMS combination, which implied the required UV fluence to 2-log E. coli inactivation was saved up to 42 %. Also, UVA-LED and 1 mg/L PMS combination showed disinfection potential for real RAS wastewater treatment. Mechanism study revealed that the Cl − , · OH and SO 4 ·- played important roles and · OH was dominant radical in saline solution by UVA-LED/PMS process compared to that in phosphate buffered solution(PBS). The E. coli inactivation was caused by UVA-LED irradiation and reactive species generated in UVA-LED/PMS system. Our study provided a potential strategy to introduce the mercury-free UV-LED into RAS and a better understanding of UVA-LED/PMS disinfection process.
研究领域:
环境科学
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水处理
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水产养殖
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微生物学
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DOI
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Fangzheng Zhao,Junxia Deng,Tong Wu,Jia Liu,Rijie Wang,Jinfeng Xing
Multifunctional materials with hemostasis, adhesive, and antibacterial properties must be developed to meet the demand for wound hemostasis. In this work, a hybrid hydrogel (ATD-HAp hydrogel) based on a terpolymer and hydroxyapatite (HAp) was prepared by photopolymerization within 1 min under green LED irradiation. The polymer chains of ATD-HAp hydrogel with adjustable tensile and adhesion properties and antibacterial properties were formed by copolymerization of acrylamide, N-[tris(hydroxymethyl)methyl] acrylamide, and dimethyldiallylammonium chloride and methacrylated carboxymethyl chitosan as a cross-linking agent. HAp was added to the hydrogel to release Ca2+ to promote coagulation. The results showed that ATD-HAp hydrogel had good tensile (196.7 kPa), wet-adhesive (10.3 kPa), self-healing, antibacterial properties, and coagulation. And the ATD-HAp hydrogel had excellent blood compatibility and biocompatibility. Furthermore, the experimental results of the hemostasis model in mice proved that the ATD-HAp hydrogel can significantly shorten the hemostasis time and reduce blood loss. Therefore, the ATD-HAp hydrogel has great potential in the field of wound hemostasis.
研究领域:
材料科学
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生物材料
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生物医学工程
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伤口愈合
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Yujia Wang,Zhigang Zhang,Yijiang Chen,Zhengfa Zhu,Hao Wang,Xiaoning Tang
Designing efficient antimicrobials for the rapid disinfection of water is increasingly critical owing to the rising threat of pathogenic microorganisms. In this study, direct Z-scheme Bi 2 WO 6 /TiO 2 heterojunctions were constructed using a simple in situ hydrothermal method. The optimal Bi 2 WO 6 /TiO 2 Z-scheme heterojunction inhibited 98.80 % of Escherichia coli (5 × 10 8 CFU mL −1 ) at 0.35 mg mL −1 and 99.33 % of Staphylococcus aureus (5 × 10 8 CFU mL −1 ) at 0.5 mg mL −1 after 10 min of light-emitting diode (LED) light irradiation. Furthermore, in antibiotic degradation experiments, Bi 2 WO 6 /TiO 2 had a 92.91 % removal rate for ciprofloxacin with a pseudo-second-order degradation rate constant ( k ) of 0.056 min −1 after 240 min of irradiation. The antibacterial mechanism of Bi 2 WO 6 /TiO 2 was systematically investigated and confirmed to occur by LED light-driven surface activation and efficient charge transfer. The surface and interfacial structures of the Bi 2 WO 6 /TiO 2 samples were studied by high-resolution transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The antibacterial mechanism was studied by controlled experiments and electron spin resonance analyses, which revealed that the primary antibacterial mechanism of Bi 2 WO 6 /TiO 2 is oxidative sterilisation via generated reactive oxygen species. Time-resolved fluorescence spectroscopy was used to analyse the charge-transfer pathway in Bi 2 WO 6 /TiO 2 , which demonstrated that the spatial separation of the redox-active sites extended the lifetimes of the photogenerated carriers, enhancing the oxidative destruction of bacteria. This comprehensive understanding paves the way for the design of new Z-type heterojunction photocatalytic materials for antimicrobial applications.
研究领域:
材料科学
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环境科学
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化学
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微生物学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2025
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IF 2.5
Ou Hai,Keke Guan,Tong Li,Zhiyuan Yu,Peng Li,Hang Li,Jiaxin Qin,Xin An
Perovskite quantum dots have become a research hotspot due to their excellent luminescence properties such as high PLQY and narrow half-wide peaks, but the complex preparation process and poor stability are the main problems affecting their application. In this study, CsPbX 3 (X = Br,I) quantum dots were uniformly grown in situ in the inner pores of SiO 2 aerogels by molten salt method in the case of all inorganic ligands, so that perovskite quantum dots can be generated and effectively protected at the same time. The CsPbBr 3 @SiO 2 aerogel and CsPbI 3 @SiO 2 aerogel composites exhibit highest luminescence intensities at 523 nm and 680 nm respectively, and have narrow half-peak widths (20 nm and 40 nm). At the same time, they have enhanced stability under air, UV lamp and high temperature. After 7 days of exposure to air and UV lamp, the PL strength of the CsPbBr 3 @SiO 2 aerogel composites remained 74.5 % and 133 % respectively. Finally, the green and white LED devices have been successfully constructed by laminating CsPbX 3 @SiO 2 aerogel composites on the surface of a 460 nm chip. These characteristics have laid a good foundation for the application of LED devices, and at the same time, CsPbX 3 @SiO 2 aerogel composites show great potential in luminescence applications.
研究领域:
材料科学
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纳米技术
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光电子学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Yong Liu,Anqi Huang,Shengchun Yang,Zhenjuan Duan,Zhengui Li,Zongtao Li,Hai Lan,Anzhong Peng,Xiaodong Wen,Zhengliang Wang
High-efficiency narrow-band red phosphor plays a profound part in stimulating illumination quality for white light-emitting diodes (WLEDs). In this work, a series of novel double-perovskite Rb 2 KInF 6 :Mn 4+ red phosphors was successfully prepared by using a facile co-precipitation technique. The crystallization, particle morphology , photoluminescence properties, and thermal quench behavior of the as-synthesized powder samples were investigated systematically. During the illumination with blue ( λ max = 468 nm) and ultraviolet light ( λ max = 370 nm), the prepared Rb 2 KInF 6 :Mn 4+ phosphors emited a series of narrowband red signals in the range 590–660 nm with strong zero-phonon line (ZPL) emission. Meanwhile, the optimum Mn 4+ concentration of at the 2 E g → 4 A 2g transitions was also studied. Moreover, the fluorescence decay lifetimes of the prepared Rb 2 KInF 6 :Mn 4+ products were milliseconds. Finally, by coating Rb 2 KInF 6 :Mn 4+ with commercially yellow Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) phosphors on the commercially available InGaN blue chip, the intense warm white light with suitable correlated color temperature (CCT, 3491 K) and high color-rendering index ( R a , 85.1) can be manufactured at a driving current of 20 mA. All of these consequences point out that the novel double-perovskite red-emitting Rb 2 KInF 6 :Mn 4+ phosphors are promising in the perspective of WLEDs applications.
研究领域:
材料科学
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光电技术
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照明工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
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2022
·
IF 7.613
Wenjing Wang,Tao Tan,Shangwei Wang,Su Zhang,Ran Pang,Da Li,Lihong Jiang,Huimin Li,Chengyu Li,Hongjie Zhang
Near-ultraviolet-pumped white light-emitting diodes (LEDs) based on the combination strategy of traditional RGB phosphors (blue/green/red) or blue/yellow phosphors have the drawback of inadequate color rendering index due to the cyan-gap (480–500 nm) in the emission spectrum . It is quite promising to find efficient cyan-emitting phosphors that can offset the cyan-gap to produce white LEDs with full-spectrum emission. In our work, we synthesized a Ce 3+ -activated ScCaO(BO 3 ) (SCB:Ce 3+ ) phosphor with a broadband blue-cyan emission. Under near-ultraviolet 396 nm excitation, the optimum SCB:0.005Ce 3+ sample shows a blue-cyan emission band with a peak of 473 nm, which is competent for filling the cyan-gap. Meanwhile, the SCB:0.005Ce 3+ blue-cyan phosphor possesses a high quantum efficiency (internal quantum efficiency = 66.5%, external quantum efficiency = 38.5%) and weak chromaticity shift (ΔE s = 1.29 × 10 −2 ). We produce white LED devices based on 395 nm LED chips and RGB or blue/yellow/red phosphors strategies. By comparing the performance parameters of white LED devices with or without blue-cyan SCB:0.005Ce 3+ phosphor, it is proved that SCB phosphor can offset the cyan gap of commercial RGB phosphors and the cyan emission lack of commercial Y 3 Al 5 O 12 :Ce 3+ phosphor. Furthermore, SCB:0.005Ce 3+ phosphor can substitute for commercial BaMgAl 10 O 17 :Eu 2+ phosphor in RGB or blue/yellow/red phosphors combinations. The prepared white LEDs based on SCB:0.005Ce 3+ blue-cyan phosphor, green/red or yellow/red phosphors show a lower proportion of high-energy blue light and are suitable for healthy lighting applications.
研究领域:
材料科学
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光电子学
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固态照明
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荧光粉化学
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发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Wenjie Deng,Decai Huang,Fengli Yang,Jiaqing Peng,Weixiong You,Xinyu Ye
Efficient cyan-emitting phosphor plays an important role in the development of solid-state lighting, which is indispensable to filling the cyan gap for full-spectrum warm-white light-emitting diodes (WLEDs) with high color rendering index (CRI). Herein, a novel highly efficient broadband cyan phosphor Ce 3+ -doped Ca 3 HfAl 2 Si 2 O 12 (CHASO: Ce 3+ ) garnet compound was developed by the substitution of Lu 3+ -Al 3+ with Ca 2+ -Hf 4+ /Si 4+ in Lu 3 Al 5 O 12 . The crystal structure and photoluminescence (PL) properties of CHASO: Ce 3+ were investigated in detail. Notably, CHASO: Ce 3+ phosphor can be effectively excited by violet light (390 – 430 nm) and exhibited bright cyan emissions around 490 nm with high PL internal quantum yields of 89.2 %. Moreover, the integrated PL intensity of the phosphor at 423 K was 66.3 % of that at room temperature. Finally, by incorporating CHASO: 11 %Ce 3+ with commercial blue/yellow/red phosphor onto a violet LED chip (400 nm), the prototype full-spectrum WLEDs device exhibits warm white light with high color rendering index (CRI, Ra and R9 > 90) and low correlated color temperature 3301 K. These results suggest the highly efficient phosphor CHASO: Ce 3+ is promising for low-blue full-spectrum healthy lighting.
研究领域:
材料科学
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光电技术
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固态照明
✓ 已验证
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2015
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IF 2.979
Xiupei Yang,Huanhuan Gao,Fan Qian,Chuan Zhao,Xiangjun Liao
An internal standard method has been developed for the simultaneous determination of anthracycline antibiotics, doxorubicin (DOX) and daunorubicin (DAN), in rabbit plasma using capillary electrophoresis (CE) with in-column double optical-fiber LED-induced fluorescence detection (CE-ICDOF-LED-FLD). Rhodamine B (RhB) was selected as an internal standard because its emission wavelength is similar to that of the anthracycline antibiotics. Parameters including buffer pH, buffer concentration, organic solvents and separation voltage have been investigated to explore the sensitivity and separation efficiency of DOX and DAN. The optimal electrophoretic separation conditions were a borate buffer (15 mM, pH 9.0) containing 50% acetonitrile (v/v), 10 s hydrodynamic injection at a height of 20 cm and a separation voltage of 15 kV. The developed CE-ICDOF-LED-FLD method provides limits of detection of 18 and 13 ng/mL for DOX and DAN in rabbit plasma samples, respectively. The recoveries ranging from 93.7 to 104.8% and the relative standard deviations at 1.1–1.7% were achieved for DOX and DAN in spiked rabbit plasma samples.
研究领域:
分析化学
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药理学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）