CURRENT APPLIED PHYSICS
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2025
·
IF 3.1
Xiangyuan Duan,Shuyan Xu
Fluorescent composite films were prepared using polyvinyl alcohol (PVA) as the substrate and NaYF 4 :Eu 3+ phosphors and κ-carrageenan powder (KC) as the fillers by the casting method. The impact of incorporating NaYF 4 :Eu 3+ on the structural, morphological, mechanical property, thermal stability, and optical characteristics of PVA/KC films was examined. The incorporation of KC promoted the formation of hydrogen bonds between KC and PVA. Consequently, the water contact angle of the films increased by approximately 10°, indicating improved water resistance. Meanwhile, the incorporation of NaYF 4 :Eu 3+ increased the thermal stability of the films, with the temperature at 5% mass loss rising by approximately 13°C. Additionally, the mass retention at 600°C improved by 3.47%. Notably, the addition of NaYF 4 :Eu 3+ had a negligible effect on the transparency of the films while imparting fluorescent properties. Under UV excitation at 395 nm, the films exhibited maximum fluorescence intensity at 616 nm, indicating a significant fluorescence effect.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiaoyi Wu,Yeqing Chen,Rui Li,Qingguang Zeng,Ting Yu
Förster resonant energy transfer (FRET) is a well-known and important phenomenon in physics , chemistry, and biology, which plays a crucial role in various photofunctional systems, including photovoltaics , and lighting, and sensing where molecular distances and interactions are probed. This paper presents a systematical investigation of the construction of interfacial FRET between carbon dots (CDs) and NaYF 4 :Eu 3+ nanoparticles (NPs) via various synthesis routes. The interfacial FRET was found to take place from CDs to Eu 3+ in the wet-mixed and the reacted nanocomposites owing to the presence of strong interfacial interactions, as evidenced by the results of Fourier Transform Infrared Spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). By employing CDs-sensitized NaYF 4 :Eu 3+ NPs as a model system, we were able to elucidate the intricate FRET mechanism between CDs and NaYF 4 :Eu 3+ NPs. Surprisingly, the reacted nanocomposite exhibits remarkable photo- and thermal-stability, as well as high resistance to thermal degradation , demonstrating the robustness of the interfacial FRET in enhancing Eu 3+ emission intensity. The study presents a convenient and versatile approach to achieving interfacial FRET based on CDs nanocomposites, which have a promising potential application in solid-state lighting and biomedicine.
研究领域:
材料科学
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光学
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生物医学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
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2013
·Vol. 15
·期 41
·8262-8272
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IF 3.879
Qin Wang,Yunxia Liu,Baocang Liu,ZhanLi Chai,Guangran Xu,ShengLi Yu,Jun Zhang
Cubic α- and hexagonal β-phase lanthanide luminescent NaYF4:Eu3+/Tb3+ nanostructures with diverse morphologies were successfully synthesized via a mild solvothermal method. The effects of the synthetic parameters on the crystal phase structure, size and morphology of NaYF4:Eu3+/Tb3+ nanostructures were systematically investigated. By modifying the synthetic parameters, the crystal phase structure, size and morphology were well controlled, and the phase transition from cubic α- to hexagonal β- can be easily realized. Furthermore, the morphology evolution is revealed, and the surfactant modulating formation mechanisms with diverse morphologies was proposed. The photoluminescence properties were found to be in close correlation with their composition, phase structure and morphology. NaYF4:Eu3+/Tb3+ nanostructures possessing unique morphologies and highly efficient luminescence may find potential applications in optoelectronics, sensors and biolabels.
研究领域:
材料科学
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光学
·
纳米技术
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产品关联
DOI
高影响因子
Science China-Chemistry
·
2016
·Vol. 60
·期 1
·122-129
·
IF 2.429
Zhang Shaohan,Chen Shizhu,Gao Chunyue,Jin Yi,Jia Guang,Li Zhenhua,Liu Dandan,Liang Xingjie,Yang Xinjian,Zhang Jinchao
As lanthanide-doped sodium yttrium flouride (NaYF 4 ) nanoparticles have great potential in biomedical applications, their biosafety is important and has attracted significant attention. In the present work, three different sized NaYF 4 :Eu 3+ nanoparticles have been prepared. Liver BRL 3A cell was used as a cell model to evaluate their biological effects. Cell viability and apoptosis assays were used to confirm the cytotoxicity induced by NaYF 4 :Eu 3+ NPs. Apart from the elevated malondialdehyde (MDA), the decrease of superoxide dismutase (SOD), glutathione peroxidase (GSH-PX) and catalase (CAT) activity indicated reactive oxygen species (ROS) generation, which were associated with oxidative damage. The decrease of mitochondrial membrane potential (MMP) value demonstrated the occurrence of mitochondria damage. Then, release of cytochrome c from mitochondria and activation of caspase-3 confirmed that NaYF 4 :Eu 3+ NPs induced apoptosis was mitochondria damage-dependent.
研究领域:
纳米医学
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毒理学
·
细胞生物学
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DOI
高影响因子
Science China-Materials
·
2016
·Vol. 60
·期 1
·68-74
·
IF 0
Wang Di,Wang Ruihong,Liu Liyuan,Qu Yang,Wang Guofeng,Li Yadong
Techniques for detecting glucose are developing at a breathtaking speed because diabetes mellitus can cause many serious complications, such as blindness, high blood pressure heart disease and kidney failure. Herein, water soluble NaYF 4 :Eu 3+ @Ag core-shell nanocrystals for glucose detection with lower detection limit have been successfully developed, using NaYF 4 :Eu 3+ cores as the energy donors and Ag shells as the efficient quenchers through energy transfer. After immobilization of glucose oxidase (GOx) on the surface of NaYF 4 :Eu 3+ @Ag core-shell nanocrystals, the Ag shells can be decomposed in the presence of glucose, accompanied by down-shifting luminescence recovery. The limit of detection of NaYF 4 :Eu 3+ @Ag was 0.12 μmol L −1 . Therefore, the NaYF 4 :Eu 3+ @Ag can be easily extended to the detection of a variety of H 2 O 2 -involved analytes.
研究领域:
分析化学
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纳米生物技术
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生物传感
·
糖尿病检测
·
分子诊断
·
荧光探针
✓ 已验证
DOI
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Junwei Xu,Yi Cui,Meili Liu,Zitong An,Kun Li,Xuenan Gu,Ping Li,Yubo Fan
The incidence of cancer and other diseases continues to increase, posing a serious threat to human health. Drug delivery systems using bionic red blood cell (RBC)-like microparticles (MPs) as drug carriers have been extensively studied, as they are considered ideal carriers due to the unique shape. However, most methods of preparing multifunctional RBC-like MPs are complicated, and the cell affinity and therapeutic effect of MPs prepared using simple electrospray are unsatisfactory. In this context, hydrophilicity-enhanced and magnetic-luminescent bifunctional RBCs-like Janus MPs [Fe 3 O 4 @poly(lactic-co-glycolic acid) (PLGA)-poly(ethylene glycol) (PEG)-PLGA/PLGA]//[NaYF 4 :Eu 3+ @PLGA-PEG-PLGA/PLGA] were successfully prepared by one-step double-needle electrospray method. The physical and chemical properties, such as morphology, particle size, structure, and thermal stability of the MPs, were studied. The addition of block polymer PLGA-PEG-PLGA was found to enhance the hydrophilicity of the MPs, promote cell spreading and adhesion proteins (focal adhesion kinase and Paxillin) mRNA expressions of human umbilical vein endothelial cells, significantly improving the cell affinity. The results also demonstrated that RBC-like MPs exhibited excellent magnetic and enhanced luminescent properties, making them a promising candidate for various biomedical applications, including drug delivery systems, magnetic targeting, bio-imaging, and fluorescent tracing.
研究领域:
生物医学工程
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材料科学
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药学
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细胞生物学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shaokun Ling,Xiaoyan Qin,Chang chen,Kai Meng,Yifeng Yan,Junyun Ming,Sen Liao,Yingheng Huang,Lei Hou
Despite long-term development of LEDs, problems urgent to resolve is still existing. The most outstanding problem to tackle is luminescent stability at high temperature working situation. In this study, a novel type of β-NaYF 4 based phosphor incorporated with Eu 3+ and Tb 3+ is reported. A series of β-NaYF 4 :0.065Eu 3+ , x Tb 3+ ( x = 0.001, 0.002, 0.003, 0.004, 0.005) phosphors were synthesized by hydrothermal method . The sample β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ possesses optimal luminescent property at room temperature. The mechanism of energy transfer from Tb 3+ to Eu 3+ ion is quadrupole-quadrupole interactions. The sample β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ demonstrates zero thermal quenching (ZTQ) property at 303 K to 383 K. According to XRD and XPS characterizations, nonequivalent replacement between intrinsic ion Na + and Y 3+ were discovered, which finally leads to production of crystal defects. According to electron paramagnetic resonance (EPR) characterization and density functional theory (DFT) calculation, the type of crystal defect of β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ is confirmed to be V Y vacancies which are the predominant defect of crystal. The depths and densities of defects were calculated according to data of thermoluminescence spectra (TL spectra). Crystal defects play the role of electrons traps that could store electrons. Electrons stored in traps will be excited to excitation state of Eu 3+ under the thermal stimulation to offset undesirable impact of thermal quenching (TQ), which leads to ZTQ property of the sample β-NaYF 4 :0.065Eu 3+ ,0.002Tb 3+ . The CRI and CCT of fabricated WLED are 3830 K and 84.1, respectively.
研究领域:
材料科学
·
光学
✓ 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）