APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Xin Xiao,Chunxia Zheng,Mingli Lu,Ling Zhang,Fei Liu,Xiaoxi Zuo,Junmin Nan
The selective oxidation of benzyl alcohol (BA) into benzaldehyde (BAD) is an attractive model reaction for organic synthesis. Using a microwave-calcination route, a novel flower-like Bi 24 O 31 Br 10 with surface oxygen vacancies and bromine vacancies was successfully synthesized. In the construction of Bi 24 O 31 Br 10 , glucose acts as a complexing, reducing, and structure-directing agent. The as-synthesized Bi 24 O 31 Br 10 exhibits excellent activity for the photocatalytic aerobic oxidation of BA into BAD, with >99% conversion and >99% selectivity under blue LED irradiation at ambient conditions, which is 3.3-, 4.7-, and 27.8-fold higher than that of TiO 2 , Bi 4 O 5 Br 2 , and Bi 12 O 17 Cl 2 , respectively. The high selectivity is due to the suitable energy band of the as-synthesized Bi 24 O 31 Br 10 (E g = 2.51 eV, valence band potential = +2.38 V), while the high conversion rate is largely due to the efficient separation of photogenerated carriers, surface defects, positively charge surface, and 3D micro/nano-architecture. The primary active species, including h + , e − , O 2 − , and OH, are all involved in the photoreaction. On the basis of experimental results and quantum-chemistry calculations, a direct hole oxidative mechanism with two-step dehydrogenation pathway was suggested. In addition, the as-synthesized Bi 24 O 31 Br 10 catalyst remains stable during the photocatalytic process, indicating its potential for practical applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2023
·Vol. 37
·期 10
·e7231
·
IF 3.9
Xianjie Yin,Helin Wang,Lei Shen,Qingle Zeng
A three-component reaction of olefins, indoles, and diaryl diselenides catalyzed by copper chloride under irradiation of blue LED light is disclosed. Various diaryl diselenides including diheteroaryl diselenides are suitable for this bifunctionalization of olefins. This protocol provides 26 examples of β-(hetero)arylselenyl indoles in 60%–87% yields. The proposed mechanism involves activation of diaryl diselenides by coordination with copper chloride, generation of arylselenium cations by heterolysis of activated diaryl diselenides, electrophilic addition of arylselenium cations to styrenes, and then Friedel–Crafts-type alkylation at the 3-position of NH-indoles.
研究领域:
有机化学
·
光化学
✓ 已验证
DOI
高影响因子
ChemPhotoChem
·
2024
·
IF 3
Lulu Wei,Shubing Tian,Mingze Sun,Ruili Song,Yunhu Wang,Mingming Zhang,Lei Wang,Zhanhua Wei,Jun Xing
Graphical The influence of perovskite components, preparation conditions, and device structures on the spectral stability of mixed-halide perovskite blue LED is investigated systematically. Among these factors, A-site cations, annealing temperature and the content of the passivator affect the spectral stability significantly. After optimization, a spectra-stable and efficient mixed-halide perovskite blue LED is successfully fabricated. Metal mixed-halide perovskite has demonstrated considerable potential in the development of solution-treated blue light-emitting diodes (LEDs) with high external quantum efficiency, excellent color purity, and tunable wavelength. However, the severe phase segregation of mixed-halide perovskite under bias voltage would lead to the spectral instability of LEDs. Therefore, suppressing phase segregation of Br/Cl perovskite towards spectrally stable blue perovskite LEDs (PeLEDs) is a big challenge. In this work, we systematically explore the influence of perovskite component, preparation conditions, and device structures on the spectral stability of PeLEDs. We have observed that the stable spectra increased the proportion of Cs in the A-site cations, passivator, and the annealing temperature of perovskite films. Finally, we achieve a spectra-stable and high-performance blue PeLED under optimized conditions. Our findings provide important guidance for preparing spectrally stable PeLEDs.
研究领域:
材料科学
·
光电工程
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Hanqi Wei,Qihua Yang,Guihua Li,Xuan Liu,Junben Huang,Chujie Wang,Xiaoming Li,Gemei Cai
As one type of recent emerging lead-free perovskites, Cs 2 ZrCl 6 nanocrystals are widely concerned, benefiting from the eminent designability, high X-ray cutoff efficiency, and favorable stability. Improving the luminescence performance of Cs 2 ZrCl 6 nanocrystals has great importance to cater for practical applications. In view of the surface defects frequently formed by the liquid phase method, the particle morphology and surface quality of this material are expected to be regulated if certain intervention is made in the synthesis process. In the work, differing from normal cell lattice modulation based on the ion doping, the grain size and surface morphology of Cs 2 ZrCl 6 nanocrystals are optimized via adding a certain amount of InCl 3 to the synthetic solution. The surface defects are restored to inhibit the defect-induced non-radiative transition, resulting in the improvement of the luminescence properties. Moreover, a flexible Cs 2 ZrCl 6 @polydimethylsiloxane film with excellent heat, water, and bending resistance and a light-emitting diode (LED) device are fabricated, exhibiting excellent application potential for X-ray imaging and blue LED.
研究领域:
材料科学
·
光学工程
·
医学影像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiaoqian Dong,Zhibin Chen,Lehui Liu,Feifei Yuan,Yisheng Huang,Lizhen Zhang,Zhoubin Lin
Broadband near-infrared (NIR) phosphors play a crucial role in the development of next-generation smart NIR light sources based on blue light-emitting diodes (LEDs). The emission bandwidth is an important parameter for evaluating the performance of these phosphors. Herein, an ultra-broadband NIR phosphor CaMgSi 2 O 6 :Cr 3+ (CMSO:Cr), with a tunable emission band and a full width at half maximum (FWHM) ranging from 138 nm to 393 nm, is obtained by adjusting the doping concentration of Cr 3+ . In the low-concentration doped sample, a single emission peak at 785 nm is observed. When the concentration of Cr 3+ exceeds 1.0 at%, emissions at both 785 nm and 980 nm are detected. The emission peak at 785 nm originates from the [MgO 6 ](Ⅰ) octahedron within the CMSO structure. On the other hand, the emission peak at 980 nm is attributed to the presence of a twisted octahedron [MgO 6 ](Ⅱ), which is caused by defects and vacancies resulting from the charge imbalance when Mg 2+ ions are replaced by Cr 3+ ions. The Cr 3+ ion primarily occupies the [MgO6](Ⅰ) site in the lower-concentration doped sample, which explains the photoluminescence peak at 785 nm. With the increase in the concentration of Cr 3+ ions, more and more Cr 3+ ions preferentially occupy the [MgO 6 ](Ⅱ) octahedral sites, leading to the broad emission at 980 nm. A novel NIR phosphor light source was fabricated by combining a blue chip with CMSO:Cr phosphor. Driven by a current of 60 mA, the NIR light output power of 5.89 mW and 0.76 mW is achieved by using CMSO:0.015Cr and CMSO:0.04Cr, respectively. This work demonstrates that new luminescent centers can be generated by substituting heterovalent ions, resulting in broadened emission spectra.
研究领域:
材料科学
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光电
·
光子学
✓ 已验证
DOI
高影响因子
Advanced Materials Technologies
·
2022
·Vol. 7
·期 11
·2200320
·
IF 8.856
Shihai Miao,Yanjie Liang,Yan Zhang,Dongxun Chen,Xiao-Jun Wang
Blue light-emitting diode (LED) pumped short-wave infrared (SWIR; 900–1700 nm) emitters are providing new solutions in the design of portable and cost-effective infrared light sources for medical, surveillance, and spectroscopy applications by taking advantage of converter technology. However, desirable blue-light-excitable SWIR-emitting phosphors with a peak wavelength longer than 1000 nm are lacking. Herein, a promising broadband SWIR phosphor is designed and developed by incorporating Cr 3+ -Ni 2+ ion pairs into LiMgPO 4 host. Upon 450 nm blue light excitation, the as-synthesized LiMgPO 4 :Cr 3+ ,Ni 2+ phosphor exhibits a broad and intense SWIR emission spanning from 1100–1600 nm with peak wavelength at 1380 nm and a full width at half maximum of 273 nm due to the efficient energy transfer from Cr 3+ to Ni 2+ . Moreover, phosphor-converted SWIR LED prototype device based on the combination of 450 nm blue LED chip and the optimized phosphor is fabricated as a new type of broadband illuminator covering the SWIR waveband, delivering a maximum radiant power of ≈2.7 mW at 120 mA driving current. Benefiting from the distinct spectral characteristics of SWIR light, the practical relevance of the fabricated SWIR illuminator is demonstrated in covert information identification and night vision lighting.
研究领域:
材料科学
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光学工程
·
光电子技术
✓ 已验证
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
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微生物学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Huiyuan Bai,Zhibin Huang,Yuhang Xu,Yijie Wang,Lei Zhang
All-inorganic blue-emissive CsPbBr3 perovskite nanoplatelets (NPLs) are promising for optoelectronic applications due to excellent optical properties, but their applicability is seriously restricted by a low photoluminescence efficiency and poor stability. Here, we develop a postsynthetic surface-mediated engineering strategy to prepare high-quality blue CsPbBr3 NPLs at room temperature by using strongly bound polystyrene sulfonic acid (PSS). PSS efficiently passivates the surface trap sites of NPLs via strong coordination bonds, thereby achieving high-efficiency exciton recombination and enhancing photostability. The optimized PSS-NPLs reveal intense blue emission with a central wavelength of ∼466 nm and a high photoluminescence quantum yield of ∼83.2%, indicating a substantial improvement from ∼48.3% of pristine NPLs. Simultaneously, the PSS-treated NPLs exhibit significantly enhanced stability in comparison with pristine NPLs during UV exposure and thermal treatment. Finally, we achieve efficient blue NPL-LEDs (peaked at ∼468 nm) using a PSS-NPL-polymer composite film, corresponding to CIE color coordinates of (0.124, 0.067), which closely approach to the Rec. 2020 blue standard. Hence, our work offers a facile strategy for fabricating high-performance perovskite NPLs and promotes their potential applications in blue-emitting optoelectronic devices.
研究领域:
材料科学
·
光学工程
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Shouqiang Huang,Zhichun Li,Bo Wang,Nanwen Zhu,Congyang Zhang,Long Kong,Qi Zhang,Aidang Shan,Liang Li
Under illumination of light-emitting diode (LED) or sunlight, the green color of all-inorganic CsPbBr3 perovskite nanocrystals (CPB-NCs) often quickly changes to yellow, followed by large photoluminescence (PL) loss. To figure out what is happening on CPB-NCs during the color change process, the morphology, structure, and PL evolutions are systematically investigated by varying the influence factors of illumination, moisture, oxygen, and temperature. We find that the yellow color is mainly originated from the large CPB crystals formed in the illumination process. With maximized isolation of oxygen for the sandwiched film or the uncovered film stored in nitrogen, the color change can be dramatically slowed down whether there is water vapor or not. Under dark condition, the PL emissions are not significantly influenced by the varied relative humidity (RH) levels and temperatures up to 60 °C. Under the precondition of oxygen or air, color change and PL loss become more obvious when increasing the illumination power or RH level, and the large-sized cubic CPB crystals are further evolved into the oval-shaped crystals. We confirm that oxygen is the crucial factor to drive the color change, which has the strong synergistic effect with the illumination and moisture for the degradation of the CPB film. Meanwhile, the surface decomposition and the increased charge trap states occurred in the formed large CPB crystals play important roles for the PL loss.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Long Jiao,Yuwei Li,Mingyu Tian,Shuyi Zhao,Xiaoye Zhang,Soottawat Benjakul,Bin Zhang
A novel class of halogenated curcumin, X-Cur (X = F, Cl, or Br), was synthesized, and its photosensitivity was evaluated. The results showed that Br-Cur with the highest singlet oxygen (1O2) generation capacity exhibited a better photodynamic inactivation (PDI) effect on the small yellow croaker (Larimichthys polyactis) than curcumin. This was attributed to the heavy atom effect of Br, which resulted in Br-Cur having the smallest singlet–triplet energy difference ΔEst(S1-T3) (0.140 eV) and the largest spin–orbit coupling value (0.642262 cm–1). When L. polyactis was treated with 0.025 wt % Br-Cur and exposed to blue LED irradiation (450 nm, 20 mW/cm2) for 20 min, the increase in the total volatile basic nitrogen content (28.23 ± 2.38 mg/100 g on day 6), pH, and total viable count (6.13 ± 0.06 log CFU/g on day 6) could be effectively controlled. Accordingly, Br-Cur is a promising photosensitizer for PDI preservation.
研究领域:
食品科学
·
化学
·
光化学
·
水产养殖
✓ 已验证
产品关联
DOI
PubMed
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
·
光电技术
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CELLULAR AND MOLECULAR MEDICINE
·
2021
·Vol. 25
·期 11
·4962-4973
·
IF 5.31
Mingyu He,Gege Yan,Yang Wang,Rui Gong,Hong Lei,Shuting Yu,Xiaoqi He,Guanghui Li,Weijie Du,Tianshuai Ma,Manqi Gao,Meixi Yu,Shenzhen Liu,Zihang Xu,Elina Idiiatullina,Naufal Zagidullin,Valentin Pavlov,Benzhi Cai,Ye Yuan,Lei Yang
Osteosarcoma (OS) is the most common primary malignant bone tumour in adolescence. Lately, light-emitting diodes (LED)-based therapy has emerged as a new promising approach for several diseases. However, it remains unknown in human OS. Here, we found that the blue LED irradiation significantly suppressed the proliferation, migration and invasion of human OS cells, while we observed blue LED irradiation increased ROS production through increased NADPH oxidase enzymes NOX2 and NOX4, as well as decreased Catalase (CAT) expression levels. Furthermore, we revealed blue LED irradiation-induced autophagy characterized by alterations in autophagy protein markers including Beclin-1, LC3-II/LC3-I and P62. Moreover, we demonstrated an enhanced autophagic flux. The blockage of autophagy displayed a remarkable attenuation of anti-tumour activities of blue LED irradiation. Next, ROS scavenger N-acetyl-L-cysteine (NAC) and NOX inhibitor diphenyleneiodonium (DPI) blocked suppression of OS cell growth, indicating that ROS accumulation might play an essential role in blue LED-induced autophagic OS cell death. Additionally, we observed blue LED irradiation decreased EGFR activation (phosphorylation), which in turn led to Beclin-1 release and subsequent autophagy activation in OS cells. Analysis of EGFR colocalization with Beclin-1 and EGFR-immunoprecipitation (IP) assay further revealed the decreased interaction of EGFR and Beclin-1 upon blue LED irradiation in OS cells. In addition, Beclin-1 down-regulation abolished the effects of blue LED irradiation on OS cells. Collectively, we concluded that blue LED irradiation exhibited anti-tumour effects on OS by triggering ROS and EGFR/Beclin-1-mediated autophagy signalling pathway, representing a potential approach for human OS treatment.
研究领域:
肿瘤学
·
细胞生物学
·
分子生物学
·
光生物学
✓ 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）