JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Wei Gao,Shanshan Han,Boyang Wang,Zeyu Sun,Yanrui Lu,Qingyan Han,Xuewen Yan,Jihong Liu,Jun Dong
Harnessing the precious metal plasmon effect is a powerful way to enhance the upconversion luminescence of rare-earth materials, so it has received extensive attention from researchers. In this study, a series of AMF@SiO 2 @NaYbF 4 : Er 3+ composite structures were constructed with an Au mono-layer film (AMF) as the substrates and SiO 2 as the isolation layer to enhance the upconversion emission intensity of a single NaYbF 4 : 2%Er 3+ microdisk. When the size of Au nanoparticles was 72 nm and the thickness of the SiO 2 isolation layer was 24 nm, the upconversion emission enhancement factor of the single NaYbF 4 : 2%Er 3+ microdisk reached 6.98 under 980 nm laser excitation, due mainly to the enhancement of the local electromagnetic field. The upconversion luminescence properties of a single NaYbF 4 : 2%Er 3+ microdisk were significantly affected by the size of Au nanoparticles, the density of the AMF substrate, and the thickness of the SiO 2 isolation layer. The plasmon-enhanced upconversion luminescence mechanism was studied according to its luminescence properties, dynamic tests, and theoretical simulation. The synergistic effects in the local electromagnetic field, luminescence quenching, and local surface plasmon resonance effect are also discussed. The results of this research provide an invaluable theoretical basis for enhancing the upconversion luminescence of rare-earth materials with the help of AMF substrates.
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
Journal of Nano Research
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2015
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IF 0.564
Guo Zhang,Rui Tao Chai,Yu Chen,She Ying Dong,Liang Zhang,Xing Hua Li,Yuan Ru Jiang,Wei Hua Guo
NaYbF4: Yb3+, Tm3+ nanoparticles (UCNPs) capped with oleic acid (OA) have been synthesized via high-temperature solvent reaction. The optimization sample of NaYb0.96Er0.02Tm0.02F4 nanoparticles possess spectral purity (the Snw value is bigger than 0.7) and intense near infrared to near infrared (NIR-to-NIR) upconversion luminescence (UCL) (the power of laser is as low as 3.8 W), which makes them ideal and promising platforms for high contrast bioimaging.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Xiaoli Luo,Qichen Chen,Hongbo Guo,Heng Zhang,Xiaowei He,Wu Zhao
Fluorescence imaging techniques represent essential tools in in vitro , preclinical, and clinical studies. In this study, an improved one-step hydrothermal method to synthesize citric acid (CA) modified α -NaYbF 4 :2%Er 3+ nanocrystals was proposed. The introduction of various doping ions into NaYbF 4 :2%Er 3+ and the different valence states of the same ions affect both the crystal size and upconversion luminescence. Therefore, we investigated the upconversion luminescence enhancement of NaYbF 4 :2%Er 3+ by ion doping and find that the upconversion luminescence intensity of the upconversion nanoparticles (UCNPs) co-doped with 5 mol% Fe 2+ ions shows the greatest enhancement, especially for red emission at 654 nm. Furthermore, HeLa cells incubated with UCNPs allow for imaging with strong red upconversion emission detection. Confocal laser scanning microscope (CLSM) fluorescent images of HeLa cells indicate that NaYbF 4 :2%Er/5%Fe 2+ leads to a clear outline and improves visualization of the cell morphology. In addition, the CA coated NaYbF 4 :2%Er 3+ /5%Fe 2+ nanoparticles and NaYbF 4 :2%Er 3+ /5%Fe 2+ show low cytotoxicity in HeLa cells. Organ imaging reveals the efficiency of these UCNPs to analyze the lungs, liver, and spleen. Together, these results indicate that the Cit-NaYbF 4 :2%Er 3+ /5%Fe 2+ UCNPs are efficient nanoprobes for fluorescence molecular tomography.
研究领域:
生物医学工程
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材料科学
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纳米医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Xiaoli Luo,Wu Zhao,Qichen Chen,Mingfeng Zhi
As a matrix material, NaYbF 4 has attracted more and more attention due to its large absorption cross section and high energy transfer efficiency. In this study, lanthanide doped NaYbF 4 upconversion (UC) nano-/micro-crystalline was carefully synthesized by hydrothermal method . The influence of kinds of external conditions, including reaction time, initial reaction solution pH value, organic solvents codoping, and Na + concentration on crystalline phase, size, morphology and especially luminescent property are systematically studied and the possible formation mechanism based on PH values is emphatically proposed. The products of NaYbF 4 with various morphologies range from nanospheres , microprisms, microdisks, hexagonal crown-capped shapes, hexagonal clam-like shapes and hexagonal flower-like shapes were successfully prepared. The results show that the up-conversion luminescence property is positively correlated with the slenderness ratio. Solvents codoping and Na + concentration can greatly improve the luminescence property, especially for red emission. Impressively, the emission colors and intensities might be finely tuned through finely tuning the PH values, solvents co-doping and Na + dosage. Furthermore, this study will be expected to contribute to the synthesis of various morphologies and improving the UC intensity of lanthanide doped crystals.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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