Nanoscale
·
2019
·Vol. 11
·期 13
·6182-6191
·
IF 6.97
Jinjin Ma,Qianting Yao,John A. McLeod,Lo-Yueh Chang,Chih-Wen Pao,Jiatang Chen,Tsun-Kong Sham,Lijia Liu
Inorganic lead halide perovskite CsPbX3 (X = Cl, Br, or I) nanocrystals are promising candidate materials for light-emitting devices and optoelectronics. Mn-Doped CsPbX3 is of particular interest, as the Mn-doping introduces an additional emission band, making this material a promising white-light emitter. In this study, Mn-doped CsPb(Br/Cl)3 nanocrystals are prepared at room-temperature and ambient pressure. The chemical environment of Mn, and the luminescence of these nanocrystals are analyzed in detail using X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), X-ray absorption near-edge structure (XANES) and X-ray excited optical luminescence (XEOL). Although the introduction of Mn does not alter the long-range order of the CsPbX3 crystal, it leads to a local lattice contraction with the bond length of Mn–X much shorter than Pb–X. We also find excitation energy-dependence in both the intensity and wavelength of the perovskite excitonic emission band, while only in intensity of the Mn emission band. Detailed fitting of the XEOL reveals that the perovskite emission band is dual-channel, and it is the excitation energy-dependent intensity variation of these two channels that drives the observed red-shift of the combined emission band. Our findings also confirm that the Mn emission band is driven by exciton-Mn energy transfer and clarify the Mn chemical environment and the luminescence mechanism in Mn-doped CsPb(Br/Cl)3 nanocrystals.
研究领域:
材料科学
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光电子学
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纳米技术
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固体物理
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 15
·5182-5189
·
IF 7.393
Liang Bao,Wenqiang Liu,Yonghua Chen,Yanbo Zhang,Yang Zhang
The local surface plasmon resonance effect induced by metal nanoparticles on perovskites provides a powerful approach to enhance the photoluminescence of such all-inorganic systems. Here, we show that the decoration of CsPb(Br/Cl)3 nanocrystals (NCs) with Au nanoparticles (NPs) leads to a significant enhancement of the blue emission centered at 465 nm, resulting in a photoluminescence quantum yield (PLQY) of up to 73%. Our simulations based on finite difference time domain (FDTD) analysis indicate that the distance between the Au NPs and CsPb(Br/Cl)3 NCs plays a crucial role in determining the local electric field intensity. Our data suggest that an excessive decoration of CsPb(Br/Cl)3 NCs with Au NPs can also reduce the PLQY, as a result of decreased coupling strength.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Wei Liao,Xinquan Zhou,Jiance Jin,Yuzhen Wang,Zhiguo Xia
Thermochromic luminescent materials (TLMs) with spectral responsiveness to thermal stimuli have received broad attention due to the forefront applications in temperature visualization and sensing technologies. Herein, a phase diagram-driven strategy for designing TLMs in Cs–Cd–Br ternary system is presented. The room temperature stable Cs 7 Cd 3 Br 13 crystal is first obtained by utilizing a facile hydrothermal method, and the self-trapped exciton (STE) luminescence is improved by breaking local symmetry via Mg 2+ doping. Then thermochromic luminescence is further realized in Mn 2+ co-doped Cs 7 Cd 3 Br 13 on the basis of reversible structural transition to metastable Cs 2 CdBr 4 under thermal stimuli. The emission color change from bright yellow to green benefits from the variation of crystal fields around Mn 2+ , which can be switched by heating and cooling circulations. Finally, the resulting material is used as a demo to visualize the temperature of a homemade high-frequency induction heating sintering platform.
研究领域:
材料科学
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光学工程
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温度传感技术
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产品关联
DOI
高影响因子
Journal of Information Display
·
2019
·
IF 0
Xiaoliang Pang,Xuejie Zhang,Bingfu Lei,Haoran Zhang
Embedding CsPbX3 (X = Cl, Br, I) perovskites QDs in inorganic glass matrix via in-situ crystallization has been regarded as a feasible strategy to improve their stability against water, heat, and light irradiation. However, the tunable-emission range of these CsPbX3-nanocrystals-embedded glasses is still narrow, insufficient to cover a wide color gamut. Herein, a simple synthetic method was developed in this study to obtain the tunable-emission CsPb(Cl/Br)3 quantum dots (QDs) in boro-germanate glass (CsPb(Cl/Br)3 QDs@glass) by controlling the molar ratio of PbBr2/PbCl2. With the increase of the PbBr2 concentration from 1.6 to 3.2 mol%, the emission wavelength of CsPb(Cl/Br)3 QDs@glasses can be shifted from 448 to 485 nm, and the corresponding photoluminescence quantum yield (PLQY) increases from 0.61 to 24.43%. In addition, the CsPb(Cl/Br)3 QDs@glass exhibits impressing promotion of thermal stability, photostability, and water resistance due to the excellent protective function of the glass matrix. As a proof-of-concept experiment, a LED device was fabricated by employing the optimal CsPb(Cl/Br)3 QDs@glass with a commercial 375 nm UV chip, yielding an intense cyan light. All the results indicate that the investigated CsPb(Cl/Br)3 QDs@glasses may find promising applications as color convertors in wide-color-gamut liquid crystal displays (LCDs).
研究领域:
材料科学
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光电技术
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纳米技术
✓ 已验证
DOI
LANGMUIR
·
2024
·
IF 3.7
Qiongyuan Zhang,Yanping Wang,Jilong Han,Haining Liu,Huifang Zhang,Zhijian Wu,Siyuan Zhang,Wenjie Han,Xiushen Ye
Layered double hydroxides (LDHs) have garnered significant attention from researchers in the field of adsorption due to their unique laminated structures and ion exchange properties. LDHs with various anion intercalation showed different adsorption effects on adsorbing ions, but the corresponding adsorption mechanisms are ambiguous. In this study, three types of NiAl-LDHs were synthesized, utilizing NO3–, CO32–, or Cl– as the interlayer anions. Batch tests were conducted to study their adsorption performances for Br–. Among them, the LDH with a NO3– intercalation layer exhibited the highest adsorption capacity for Br–, reaching up to 1.40 mmol g–1. The adsorption kinetics, mechanism, and renewability of these NiAl-LDHs were systematically compared. As a result, the type of Br– adsorption by all three materials was single molecular layer chemisorption. Moreover, the thermodynamic results of adsorption suggested that the adsorption of Br– was a spontaneous exothermic process. X-ray photoelectron spectroscopy, X-ray diffraction, and point of zero charge analysis collectively indicated that the adsorption of Br– by LDHs primarily occurred through interlayer ion exchange and electrostatic interactions. Structural characterizations of the adsorbents revealed that Br– entered the interlayers of the three LDHs, causing varying degrees of reduction in the interlayer spacing. Density functional theory calculations indicated that the interlayer binding energy of LDH with NO3– intercalation was the lowest, thereby making it more susceptible NO3– to be exchanged with Br–. Finally, the stability of the NiAl-LDHs was studied. The NiAl-LDHs retains a high removal efficiency of Br– even after 5 cycles of adsorption and desorption.
研究领域:
环境科学
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材料科学
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化学工程
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表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yongfeng Liu,Yupeng Ying,Qingyu Xie,Zhaoju Gao,Xiuwen Shao,Min Zhou,Wei Pei,Xiaosheng Tang,Yusong Tu
Mixed-halide CsPb(Br/Cl)3 perovskite quantum dots (PeQDs) have attracted extensive attention in light-emitting diodes (LEDs), but their low photoluminescent efficiency and especially poor stability impede their practical applications. Here, we employ bifunctional didodecyldimethylammonium thiocyanide (DDASCN) with a pseudohalogen SCN– and branched DDA+ to obtain blue-emitting CsPbBr2Cl PeQDs. DDASCN significantly boosts the photoluminescence quantum yield to 92% by inhibiting nonradiative recombination. Importantly, DDASCN PeQDs show excellent stabilities against air, UV light, heat, and polar solvents. These improved performances were explained by density functional theory calculation, which shows that SCN– fills the Cl– vacancy by simultaneously binding with undercoordinated Pb2+ and Cs+, while DDA+ connects undercoordinated Br– and lies parallel to the PeQD core, leading to efficient passivation and a strong binding capacity. Finally, we achieved high-performance white LEDs by integrating our PeQDs, resulting in a color-rendering index of 92.9, a color gamut of 119.61%, and chromaticity coordinates of (0.33, 0.33). This provides an effective method to obtain efficient and stable CsPb(Br/Cl)3 PeQDs for practical applications.
研究领域:
材料科学
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光电技术
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纳米技术
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光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
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2022
·
IF 9.417
Qian Wu,Le Tong,Zhiru Zou,Yingqiao Li,Jinyu An,Wenwen Shen,Yu Gao,Ying Liu,Chao Wu
The objective of this study was to prepare Herceptin-functionalized SK-BR-3 cell membrane-wrapped paclitaxel nanocrystals (HCNCs) as a targeted delivery module for HER2-positive breast cancer. According to transmission electron microscopy (TEM) images, HCNCs presented a membrane-coated cubic shape with a particle size of approximately 220 nm. In vitro release test suggested that HCNCs had a certain sustained release effect of paclitaxel (PTX). Cell uptake experiments, in vivo imaging, and tissue distribution experiments demonstrated that HCNCs had excellent targeting ability to homologous tumor cells (SK-BR-3). The results of MTT, flow cytometry, Western blot, cell immunofluorescence staining, and in vivo antitumor experiments proved that HCNCs had a more significant ability to promote HER2-positive breast cancer cell apoptosis and inhibit its proliferation. These results clearly concluded that HCNCs were a promising nano-targeted preparation in anti-HER2-positive breast cancer.
研究领域:
药学
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肿瘤学
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纳米技术
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生物医学工程
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 23
·1901082
·
IF 7.125
Daqin Chen,Su Zhou,Feifan Tian,Haitao Ke,Naizhong Jiang,Shujin Wang,Yongzhao Peng,Yue Liu
Recently, Mn 2+ -doped CsPb(Cl/Br) 3 perovskite nanocrystals (NCs), showing the advantages of dual-color emissions via exciton-to-dopant energy transfer and reduced usage of toxic Pb 2+ heavy metal ions by nontoxic Mn 2+ substitution, are widely explored. However, photoluminescence quantum yields (PLQYs) for Mn 2+ -doped CsPb(Cl/Br) 3 NCs still need to be further improved. Here, a halogen-hot-injection strategy is developed to prepare Mn:CsPb(Cl 0.6 Br 0.4 ) 3 NCs with the maximal PLQY of 65%. With this method, intense blue narrowband emission from excitonic recombination and orange broadband emission from Mn 2+ 4 T 1 → 6 A 1 transition can be simultaneously achieved. The competitive luminescence between perovskite NCs and Mn 2+ dopants is systematically investigated by controlling the injected halogen types and ratios. As a proof-of-concept experiment, the present Mn 2+ -doped CsPb(Cl/Br) 3 perovskite NCs with highly efficient dual-color emissions are demonstrated to be applicable as color converter in UV-excitable solid-state lighting.
研究领域:
材料科学
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纳米技术
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光电
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化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Pharmaceutics-X
·
2024
·
IF 5.2
Xing Liu,Wenwen Shen
In this study, the trastuzumab-functionalized SK-BR-3 cell membrane-wrapped mesoporous silica nanoparticles loaded with pyrotinib (Tra-CM-MSN-PYR) were prepared for targeted therapy of HER2-positive breast cancer. Transmission electron microscopy (TEM) characterization showed that MSN had a spherical morphology with mesoporous channels and that the structure of Tra-CM-MSN was a cell membrane (CM) layer successfully coated on the surface of MSN. A cellular uptake assay demonstrated that FITC-labeled Tra-CM-MSN were taken up by SK-BR-3 breast cancer cells, which illustrated that Tra-CM-MSN had good targeting ability compared with CM-MSN and MSN. In vivo imaging experiments demonstrated significant accumulation of FITC-labeled Tra-CM-MSN in tumor tissues, further proving that Tra-CM-MSN have superior targeting properties. Cell apoptosis experiments suggested that Tra-CM-MSN-PYR significantly inhibited the proliferation of SK-BR-3 breast cancer cells. The results of in vivo animal experiments also showed that Tra-CM-MSN-PYR significantly inhibited tumor growth. These results indicate that Tra-CM-MSN-PYR has potential application as a targeted therapy for HER2-positive breast cancer in the future.
研究领域:
药学
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纳米技术
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肿瘤学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PEST MANAGEMENT SCIENCE
·
2024
·
IF 3.8
Yuecheng Zhao,Lu Zhang,Chuanshan Zou,Huilin Han,Chengde Li,Xingpeng Li,Liwen Song
BACKGROUND Cuticular proteins (CPs) play essential roles in forming cuticular structures in insects. However, the specific functions and regulatory mechanisms of CPs remain largely unexplored. In this study, the Larval cuticular protein 17 ( HcLCP-17 ) gene was identified from Hyphantria cunea , a highly destructive and polyphagous forest pest. To investigate the role of HcLCP-17 in cuticular function and transcriptional regulation mediated by 20E-responsive transcription factors (ERTFs), we employed RNA interference (RNAi) and yeast one-hybrid assay techniques. Additionally, we examined the molecular mechanism by which chlorbenzuron, a type of benzoylphenylurea (BPU) that functions as a chitin synthesis inhibitor (CSI), affects the 20E signaling pathway and ultimately regulates HcLCP-17 expression. RESULTS HcLCP-17 encodes a polypeptide consisting of 393 amino acids, which includes a chitin-binding domain. Silencing HcLCP-17 resulted in a disturbance in the structural organization of the larval cuticle and a notable reduction in chitin levels. HcLCP-17 expression was controlled by the interaction between Broad-Complex (Br-C) and beta Fushi Tarazu Factor-1 (βFTZ-F1) with its promoter fragment. Furthermore, the inhibitory effect of chlorbenzuron on HcLCP-17 expression was found to be potentially mediated by Br-C and βFTZ-F1. CONCLUSION The study presents a novel mode of action for the 20E signaling pathway in regulating the expression of CPs and reveals the potential mode-of-action of BPUs in insect cuticles. These findings provide a theoretical basis for future utilization of LCP-17 as a pesticide target making a significant contribution to the development of effective pest management strategies. © 2024 Society of Chemical Industry.
研究领域:
昆虫学
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分子生物学
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害虫管理
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Kewei Ma,Yuhang Sheng,Guizhen Wang,Xiaowei Zhang,Yunsong Di,Cihui Liu,Liyan Yu,Lifeng Dong,Zhixing Gan
Mn 2+ doping has been developed to modulate the photoluminescence (PL) of CsPbCl 3 perovskite quantum dots (PQDs). However, the doped Mn 2+ may be expelled from the PQDs host with the long-term storing, resulting in inferior stability. Herein, CsPbCl 3 PQDs doped with different concentrations of Mn 2+ (Mn:CsPbCl 3 ) are prepared by a hot injection method. Our photostability tests reveal that when the doping concentration is <25%, or 40%–50%, the Mn 2+ doped PQDs are intrinsically stable. Anion exchange reactions are conducted between the stable CsPb 0.796 Mn 0.204 Cl 3 and CsPbBr 3 PQDs. Fluorescence color gamut of the resulting Mn:CsPb(Cl/Br) 3 PQDs almost covers the entire visible spectrum except for the deep red color. Benefiting from the intrinsic stability and wide color gamut, multicolor solid-state luminescence are acquired by incorporating the Mn:CsPb(Cl/Br) 3 PQDs in polymethyl methacrylate (PMMA) matrices, which are used as color converters for constructing light-emitting diodes (LEDs) with different colors.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
FISH & SHELLFISH IMMUNOLOGY
·
2019
·
IF 3.298
Guanghua Xiong,Yunyun Deng,Zigang Cao,Xinjun Liao,Jun'e Zhang,Huiqiang Lu
Salvia plebeia R. Br. is a traditional Chinese medicinal herb that has been widely used for the treatment of many inflammatory diseases such as hepatitis. However, the underlying molecular mechanism about the hepatoprotective effects of S. plebeia remains largely unknown. Here, we investigated the antioxidant activities and anti-inflammatory effects of ethanol extracts of S. plebeia (SPEE) in the zebrafish model. Firstly, we determined the chemical compositions of SPEE and identified three major constituents by using GC-MS analysis. After that, SPEE exhibited significantly antioxidant properties in the LPS-induced zebrafish embryos, and the enzyme activities of ROS, CAT and SOD were obviously inhibited in a dose-dependent manner. Secondly, SPEE greatly reduced fat vacuoles (HE staining), lipid accumulation (Oil O staining) and hepatocyte fibrosis (Gemori staining) in the thioacetamide (TAA)-induced hepatocyte injury of adult zebrafish. Meanwhile, the NO contents and lipid metabolism-related genes were substantially down-regulated after SPEE exposure. Thirdly, we used RNA-Seq analysis to identify the differentially expressed genes (DEGs) after SPEE exposure in adult zebrafish liver. The results showed that 1289 DEGs including 558 up-regulated and 731 down-regulated were identified between the TAA + SPEE and TAA groups. KEGG pathway and GO functional analysis revealed that steroid biosynthesis , oxidation-reduction and innate immunity were significantly enriched. Mechanistically, SPEE can considerably reduce the cell apoptosis of hepatocytes and promote the translocation of Nrf2 protein from the nucleus to the cytoplasm in TAA-induced zebrafish. Moreover, SPEE can modulate various inflammatory cytokines and immune genes both in the control and H 2 O 2 -stimulated conditions. The pro-inflammatory cytokines such as IL-1β and TNF-α was markedly up-regulated but the anti-inflammatory cytokines such as TGF-β was greatly down-regulated after SPEE treatment. In addition, some key genes in the TLR signaling were also activated in the H 2 O 2 -stimulated conditions. In summary, our results suggested that SPEE had an important role in the antioxidant and anti-inflammatory effects in zebrafish in the near future. Some of the components identified in this study may be served as potential sources of new hepatoprotective compounds for the treatment of inflammatory diseases.
研究领域:
药理学
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分子生物学
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毒理学
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基因组学
✓ 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）