CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yajun Jia,Chengdong Peng,Meng Gao,Keqin Yang,Aiying Wang,Yuexiao Pan
Owing to the ease of synthesis and the unique luminescence characteristics for the applications of white light emitting diodes (WLEDs), the red-emitting fluoride phosphors activated by Mn 4+ ions are critical to achieving WLEDs with ideal color rendering index (CRI). In this work, a new type of Mn 4+ doped phosphor KRb 3 Ge 2 F 12 :Mn 4+ (KRGF:Mn) has been synthesized by a simple ion-exchange method in atmosphere. A strategy of surface modification by using a weak reducing agent oxalic acid (OA) is proposed, which can essentially improve the moisture stability of phosphor KRGF:Mn. Moreover, the modified phosphors can still maintain bright red light after being completely immersed in water for more than 100 days. A group of LEDs combined with the as-synthesized phosphor KRGF:Mn as a light source can be well applied to artificial lighting for the growth of tomatoes and Chinese cabbage plants. Additionally, the luminescence efficiency of KRGF:Mn has been optimized with high thermal stability. This work will provide high-quality red phosphor for LED lighting sources that being required for indoor plant growth.
研究领域:
材料科学
·
植物学
·
光学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zihao Yan,Zhiying Feng,Sen Zhou,Xiaoming Yang
While room temperature phosphorescence (RTP) associated with carbon dots (CDs) has been widely achieved, obtaining long-wavelength emission RTP, especially while mitigating the quenching effect of water or dissolved oxygen, remains a challenging yet desirable goal. We synthesized three types of phosphorescent CDs with varying luminescent properties by using three precursors with carboxyls positioned differently. The formation process of these CDs resulted in a well-ordered and compact structure, effectively inhibiting molecular vibrations and reducing non-radiative transitions. Consequently, it successfully prevented the quenching effect of dissolved oxygen on the RTP of CDs in an aqueous environment. Significantly, PA-AIBN synthesized with phthalic acid, rather than iso -phthalic acid and terephthalic acid, exhibited long-wavelength emission RTP, with the phosphorescent emission center reaching as far as 640 nm. To be specific, the ortho -substituted carboxyls played a critical role in boosting the formation of intramolecular hydrogen bonds. Simultaneously, an increase in the doping levels of both nitrogen (N) and phosphorus (P) in PA-AIBN facilitated the long-wavelength emission RTP. The increased sp 2 conjugated carbon core of PA-AIBN narrowed the optical band gap, contributing to the long-wavelength emission. Taken together, these factors cooperatively promoted the long-wavelength emission of RTP. Importantly, the PA-AIBN synthesized in this study exhibited a broad half-peak width and long-wavelength emission. It was successfully used in the preparation of white-light-emitting diodes without the need for commercial phosphor powder, demonstrating its enormous potential for practical lighting devices.
研究领域:
材料科学
·
光学
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DOI
高影响因子
FOOD CONTROL
·
2021
·
IF 5.548
Lihui Zhang,Min Zhang,Sakamon Devahastin,Kun Liu
Casein and ethyl cellulose (Cas + EC) complexes were fabricated and used for encapsulation of curcumin (Cur). Physicochemical properties of Cas + EC/Cur along with its antibacterial activity when used in combination with blue LED irradiation were investigated. Encapsulation efficiency of microparticles at Cas:EC of 1:1 was the highest at 92.4%, with average particle size of 1.47 μm and ζ-potential of −21.40 mV. Fourier transform infrared spectroscopy revealed that Cur was well encapsulated in Cas + EC by electrostatic interactions; more hydrogen bonds were also formed. At optimal encapsulation condition, Cur exhibited good thermal stability; its water solubility improved 69 folds, while its release rate in oily food mimic reached 76%. Cas + EC/Cur in combination with blue LED irradiation could rapidly inactivate Escherichia coli ATCC 43894, Staphylococcus aureus ATCC 23235 and Pseudomonas aeruginosa MCC-208. Such desirable activities are attributed to the production of reactive oxygen species, which caused increased membrane permeability and reduced bacterial cell integrity.
研究领域:
食品科学
·
微生物学
·
材料科学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 8
·3702-3712
·
IF 3.5
Dechao Yu,Qingyang Ding,Tiantian Shen,Liang Qiu,Fanquan He,Xinxin Han,Enhai Song,Songlin Zhuang,Dawei Zhang
Broadband short-wave near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have been attracting keen interest for miniature NIR spectroscopy, while still lacking sufficient novel broadband NIR-emitting phosphors. Herein, we report a novel MgNb2O6:Cr3+ polycrystalline phosphor with a broad NIR emission band centered at 970 nm and a large full-width at half-maximum of approximately 155 nm under excitation of bluish-green light at around 515 nm. The optimized phosphor MgNb2O6:1%Cr3+ features a high internal quantum efficiency (IQE) of ∼85.5% and a moderate external QE of 25.2%. The fluorescence properties determined by two distorted hexa-coordination octahedral sites (i.e. [MgO6] and [NbO6]), low crystal field strength (Dq/B ∼ 1.65), and Cr3+-doping concentration were systematically investigated for comprehensive understanding of photophysical mechanisms. Besides, this broadband NIR phosphor MgNb2O6:Cr3+ exhibits a moderate thermal quenching of 21.4%@373 K for pc-LED application. An NIR pc-LED self-built by combining the optimal phosphor with a commercial cyan of ∼515 nm exhibits an NIR output power increase from 3.19 to 11.38 mW as the drive current is varied from 40 to 220 mA. With the help of this prototype pc-LED device, multiple applications were successfully performed to clearly recognize blood vessel distributions in the human finger, penetrate a plastic cap, and distinguish multi-color text. Undoubtedly, further development of such broadband short-wave NIR-emitting phosphors will make novel pc-LED devices for significant applications in biomedical imaging, nondestructive safety detection, intelligent identification, etc.
研究领域:
材料科学
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光电子学
·
固态照明
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光谱学
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生物医学成像
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无损检测
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Ruoxi Huang,Deyi Yao,Kaichen Sun,Qihang Liu,Zhonghua Xu,Rongqiu Lv,Teng Ma,Jun Chen
With the continuous increase in research and market demand for display, Micro-light-emitting diode (Micro-LED) has become one of the current research hotspots in the display industry due to its outstanding performance in color, resolution, life, and energy consumption. In this study, all-inorganic perovskite quantum dots (QDs) were synthesized using a hot injection method and uniformly coated on the surface of a polyethylene terephthalate (PET) substrate. Subsequently, laser processing technology was used to pattern the QDs film, achieving precise pattern design. Even after bending the film 100 times, the peak intensity of photoluminescence could still reach over 50 % compared with that of unbending. We used these specially treated flexible QDs films as the color conversion layers to realize color conversion display of Micro-LED. This research provides a research direction for the development of new display technology.
研究领域:
材料科学
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光电子学
·
显示技术
·
纳米技术
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2017
·Vol. 72
·期 2
·359-368
·
IF 1.258
Xia Bin,Yao Juan-juan,Han Chen-xi,Zhang Zhi,Chen Xiang-yu,Fang Yan-juan
The degradation of ofloxacin (OFX) at low concentration in aqueous solution by UVA-LED/TiO 2 nanotube arrays photocatalytic fuel cells (UVA-LED/TiO 2 NTs PFCs) was investigated. TiO 2 nanotube arrays (TiO 2 NTs) photoanode prepared by anodization-constituted anatase–rutile bicrystalline framework. The results indicated that the degradation efficiency of OFX by UVA-LED/TiO 2 NTs PFC was significantly enhanced by 14.3% compared with UVA-LED/TiO 2 NTs photocatalysis. The pH affected the degradation efficiency markedly; the highest degradation efficiency (95.0%) and the pseudo-first-order reaction rate constant k value (0.049 min −1 ) were achieved in neutral condition (pH 7.0). The degradation efficiency increased with the increasing concentration of dissolved oxygen (DO) in the UVA-LED/TiO 2 NTs PFC. The main reactive species of OFX degradation are positive holes (h + ) and superoxide ion radicals (O
·− 2
) in a DO sufficient condition. Furthermore, the possible pathways of OFX degradation were proposed.
研究领域:
环境科学
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化学工程
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材料科学
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产品关联
DOI
高影响因子
Materials Today Nano
·
2024
·
IF 8.2
Qiwen Xue,Peiqing Cai,Xipeng Pu,Qi Ai,Junjie Si,Xin Yao,Gongxun Bai,Qianmin Dong,Zugang Liu
Indium phosphide quantum dots (InP QDs) have emerged as highly promising contenders for cadmium-based quantum dots , primarily due to their environmentally sustainable attributes. Early methods for synthesizing InP QDs employed tris(trimethylsilyl)phosphine and tris(dimethylamino)phosphine as phosphorus sources. However, the associated toxicity and hazards of these sources have hindered further progress. In this study, we introduce tripyrrolidine phosphine as a safe alternative phosphorus source. This source not only guarantees affordability, but also simplifies recycling and hazardous waste treatment processes. Simultaneously, precise regulation of the Zn precursor during the growth of the ZnS shell has enabled the synthesis of InP QDs of exceptional quality with a prominent emission peak at 525 nm, an impressive photoluminescence quantum yield of 76.11 %, and a narrow half-peak width of 37 nm. This achievement sets a significant precedent for the development of an environmentally friendly InP QD synthesis methodology. Furthermore, the incorporation of the QDs into white LEDs yields compelling outcomes, including color coordinates of (0.33, 0.30) and a measured correlated color temperature of 5637 K. Therefore, this study not only establishes an innovative path for InP QD production, but also drives their broader integration into the realm of white LED applications.
研究领域:
材料科学
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光学工程
·
环境科学
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Jing Zhu,Songfang zhao,Ruifang Guan,Hao Zhang
Heteroatom doping can achieve specific regulation of carbon dots by changing their nanostructure, electronic structure and band gap. Here, we synthesized nitrogen-sulfur co-doped carbon dots (N, S-CDs) with full-spectrum fluorescence emission capability. Through comprehensive structural analysis using XPS, FTIR, and other characterization techniques, it was revealed that most of the nitrogen atoms were integrated into the carbon core of the N, S-CDs. Meanwhile, sulfur atoms were identified on the surface of the N, S-CDs, incorporated as functional groups. This unique structural configuration provides a foundation for understanding the solvent effect on N, S-CDs. Specifically, as the polarity of the solvent increases, the fluorescence emission of the N, S-CDs experiences a red-shift. The varying hydrogen donor abilities of different solvents contribute to changes in fluorescence emission. Notably, N, S-CDs exhibit near-infrared fluorescence emission when dissolved in acetic acid solvent. Under the synergistic effect of solvent polarity and hydrogen bonding, the fluorescence emission of N, S-CDs achieves full-spectrum luminescence, spanning from blue light to near-infrared. It is particularly interesting to observe that when N, S-CDs are dispersed in polyvinyl alcohol (PVA) films by dissolving them in three different solvents, the red, green, and yellow light emission can be achieved. When coated onto Light Emitting Diode (LED) lamp beads, these films exhibit versatile light emission properties. This provides inspiration for the development and preparation of LED fluorescent materials. Meanwhile, thanks to the excellent luminescent properties of N, S-CDs in water, they can be used for targeted localization of lysosomes in biological cells.
研究领域:
材料科学
·
生物医学
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光学工程
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产品关联
DOI
高影响因子
Materials Advances
·
2022
·Vol. 3
·期 15
·6171-6178
·
IF 0
Mingsheng Cai,Tianchun Lang,Tao Han,Damir Valiev,Shuangqiang Fang,Houjiang You,Bitao Liu,Ling Du,Zichao Xu,Elena F. Polisadova
Investigating narrow-band green emitting phosphors with high efficiency and good thermal stability is the main goal of the present light-emitting diode (LED) display research. Here, Ba1−xCaxScO2F:0.001Bi3+,0.001K+ (x = 0–0.12) perovskite phosphors, emitting narrow green light excited by a 415 nm chip, were developed using the cation substitution design strategy. The effects of Ca2+ substitution for Ba2+ in the Ba1−xCaxScO2F:0.001Bi3+,0.001K+ crystal structures and photoluminescence properties were investigated. All the phosphors show the cubic perovskite-type structure in the space group Pm3m. The evolution of the cell parameters and the Ba/Ca/K/Bi–O bond lengths were evaluated. The phosphors with the internal quantum efficiency of 77.4% exhibit bright green emission peaking at 510 nm under 415 nm chip excitation. The improvement of luminescence efficiency and thermal stability was discussed in detail in relation to the local structure variation. The cation substitution design strategy mentioned here can become an important approach to realize the spectral modulation through controlling the micro-environment in the lattice for excellent LED backlight displays.
研究领域:
材料科学
·
光学工程
·
无机化学
·
固体物理
·
显示技术
✓ 已验证
DOI
OPTICAL MATERIALS
·
2025
·
IF 4.2
Chen-Yang Qi,Dan Zhao,Rui-Juan Zhang,Qing-Xia Yao
Mn 4+ has garnered significant global interest due to its application in red light emission, particularly within the realm of plant growth lighting. However, there are relatively few studies focusing on the incorporation of Mn 4+ into titanate materials. In this research, we synthesized a series of Ba₆Y₂Ti 4-x O₁₇ (BYT: x Mn⁴⁺) phosphors with varying concentrations of Mn 4+ using a high-temperature solid-state synthesis method. Initially, we confirmed the structural integrity and phase purity of the samples through X-ray diffraction (XRD) analysis and refinement techniques. The experimental results indicate that under near-ultraviolet (UV) excitation, these phosphors emit far-red light at approximately 700 nm. Furthermore, their emission spectra align closely with the spectral requirements of chlorophyll and photoreceptive pigments (P r and P fr ), which are essential for optimal plant growth. This characteristic makes them promising candidates for plant cultivation applications. Consequently, we posit that BYT:0.015Mn⁴⁺ represents a novel titanate-based far-red emitting material with considerable potential for use in LED lighting systems designed for plant growth particularly in enhancing photosynthetic efficiency and promoting overall plant development.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yao Li,Qingxing Yang,Huwei Li,Xinyu Fu,Hongxia Yue,Zheyu Li,Jing Feng,Hongjie Zhang
Metal halide double perovskites are a promising alternative to lead-based perovskites. Especially, rare earth (RE)-based halide double perovskites have attracted much attention due to their unique optical properties. As RE3+ ions could be served not only as the component of the matrix but also as the luminescence centers, the chemical composition of RE-based halide double perovskites can be simplified and tunable luminescence could be achieved. In this work, Cs2NaRECl6 (RE = Tb, Eu) halide double perovskite nanocrystals were synthesized by the hot injection method. Cs2NaRECl6 nanocrystals exhibit not only the intrinsic host emission but also the characteristic emissions of RE3+ ions. Furthermore, the excitation-wavelength-dependent multicolor emissions of Cs2NaRECl6 nanocrystals make them highly potential for anticounterfeiting applications. Multicolor LED devices based on various components of Cs2NaRECl6 could be obtained, providing promising candidates for optoelectronic applications.
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
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Li Lin,De Yu,Lin Xu,Yi Huang,Manhong Huang,Hossein Kazemian
An advanced oxidation process was developed under LED blue light (BL) photocatalysis in the presence of ammonium persulfate (APS) for effective degradation of tetracycline (TC) from contaminated water . Waste rock wool (RW) fibers modified with BiOBr nano-sheet (BiOBr/RW) using impregnation combined with hydrolysis process, was employed to activate APS to produce reactive radicals under LED BL irradiation (BiOBr/RW+APS+BL system). The influence factors on TC degradation were investigated. Besides, the radical scavengers such as methanol (MA), phenol (PN), tertbutanoland (TBA) and ethylene diamine tetraacetate (EDTA-2Na) combined electron spin paramagnetic resonance (EPR) analysis were used to confirm the reactive radical species. The developed BiOBr/RW+APS+BL system exhibited much higher TC removal efficiency compared with other reported oxidation systems. In addition, the BiOBr/RW could directly activate the APS leading to degrade TC in the darkness. A maximum TC removal of 84.3% was achieved under the optimal conditions such as initial concentration of APS 100 mg/L, BiOBr/RW dosage 0.1 g/L and pH 7 in 80 min. Results also ascertained that h + , •OH and •SO 4 - over surface of the BiOBr/RW were the primary active chemical species in the BiOBr/RW+APS+BL system. It was found that the •OH and •SO 4 - in solution play critical roles for degradation of TC on the BiOBr/RW+APS system in dark. Finally, the repeated experiments indicated the excellent stability, photocatalytic ability and cycling property of BiOBr/RW.
研究领域:
环境科学
·
光催化材料
✓ 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）