Results 171 to 180 of about 3,807 (195)
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Increasing upconversion efficiency by plasmon resonance in metal nano-particles
2011 37th IEEE Photovoltaic Specialists Conference, 2011Upconversion (UC) of sub-band-gap photons has the potential to increase solar cell efficiencies. In this paper, we present investigations of silicon solar cell devices with attached upconverter based on NaYF 4 :20% Er3+. Such devices showed peak external quantum efficiencies of 0.64% under monochromatic irradiation at 1523 nm and an irradiance of 2305 ...
J. C. Goldschmidt +7 more
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Analytical and Bioanalytical Chemistry, 2018
Bisphenol A (BPA) is one of the endocrine-disrupting chemicals which might cause reproductive and endocrine system diseases, and poses a serious threat to the ecosystem and human health. This paper reports an ultrasensitive sensor for trace BPA detection employing fluorescence resonance energy transfer (FRET) between modified upconversion nanoparticles
Qiaofeng, Li +8 more
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Bisphenol A (BPA) is one of the endocrine-disrupting chemicals which might cause reproductive and endocrine system diseases, and poses a serious threat to the ecosystem and human health. This paper reports an ultrasensitive sensor for trace BPA detection employing fluorescence resonance energy transfer (FRET) between modified upconversion nanoparticles
Qiaofeng, Li +8 more
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Magnetic nanosensor particles in luminescence upconversion capability.
Angewandte Chemie (International ed. in English), 2012Nanoparticles (NPs) exhibit interesting size-dependent electrical, optical, magnetic, and chemical properties that cannot be observed in their bulk counterparts. The synthesis of NPs (i.e., crystalline particles ranging in size from 1 to 100 nm) has been intensely studied in the past decades. Magnetic nanoparticles (MNPs) form a particularly attractive
Stefan, Wilhelm +4 more
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Upconversion fluorescence imaging of erbium‐doped fluoride glass particles by apertureless SNOM
Journal of Microscopy, 2003AbstractWe have imaged fluorescent erbium‐doped fluoride glass particles by apertureless scanning near‐field optical microscopy. The optical excitation has been performed at λ = 780 nm whereas fluorescence emission has been collected around λ = 550 nm.
A, Fragola +3 more
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Advanced Materials, 2017
Topological control of nanostructures plays a crucial role in understanding the crystal growth process at the nanometer length scale. Here, the scalable synthesis of upconversion materials with distinct hedgehog‐like morphologies by a seed‐mediated synthetic procedure is reported. It is demonstrated that a close match in the crystal lattice between the
Xiaowang Liu +5 more
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Topological control of nanostructures plays a crucial role in understanding the crystal growth process at the nanometer length scale. Here, the scalable synthesis of upconversion materials with distinct hedgehog‐like morphologies by a seed‐mediated synthetic procedure is reported. It is demonstrated that a close match in the crystal lattice between the
Xiaowang Liu +5 more
openaire +2 more sources
Analytical Chemistry, 2019
Contamination of foods and feeds by aflatoxins is a universal yet serious problem all over the world. Particularly, aflatoxin B1 (AFB1) is the most primary form and readily leads to terrible damages to human health. In this work, we construct a sensitive aptasensor based on single-particle detection (SPD) to analyze AFB1 in peanut samples with ...
Fuyan Wang +5 more
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Contamination of foods and feeds by aflatoxins is a universal yet serious problem all over the world. Particularly, aflatoxin B1 (AFB1) is the most primary form and readily leads to terrible damages to human health. In this work, we construct a sensitive aptasensor based on single-particle detection (SPD) to analyze AFB1 in peanut samples with ...
Fuyan Wang +5 more
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Tuning upconversion emission by controlling particle shape in NaYF4:Yb3+/Er3+ nanocrystals
Journal of Applied Physics, 2012Rod-shaped and plate-shaped NaYF4:Yb3+/Er3+ nanocrystals (NCs) have been synthesized via a facile oleic acid-assisted hydrothermal route. The intensity and color tunability by shape controlling of NCs is demonstrated by up and down frequency conversions in NaYF4:Yb3+/Er3+ NCs.
Dangli Gao, Xiangyu Zhang, Wei Gao
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CrystEngComm, 2015
Flying particles with visible fluorescence were observed when a target, ZnF2:Tm3+/Yb3+, was irradiated by using a 953.6 nm pulsed infrared laser.
Kezhi Zheng +4 more
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Flying particles with visible fluorescence were observed when a target, ZnF2:Tm3+/Yb3+, was irradiated by using a 953.6 nm pulsed infrared laser.
Kezhi Zheng +4 more
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Advanced Functional Materials, 2019
AbstractLanthanide‐doped upconversion nanoparticles (UCNPs) have significant applications for single‐molecule probes and high‐resolution display. However, one of their major hurdles is the weak luminescence, and this remains a grand challenge to achieve at the single‐particle level.
Qiuhong Min +10 more
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AbstractLanthanide‐doped upconversion nanoparticles (UCNPs) have significant applications for single‐molecule probes and high‐resolution display. However, one of their major hurdles is the weak luminescence, and this remains a grand challenge to achieve at the single‐particle level.
Qiuhong Min +10 more
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Upconversion Particle as a Local Luminescent Brownian Probe: A Photonic Force Microscopy Study
ACS Photonics, 2014Near-infrared (NIR) light sensitive lanthanide-doped NaYF4 upconversion particles (UCPs) are gaining increasing attention as local probes in biomedical applications. Here, we implemented a photonic force microscope (PFM) to manipulate and study the optical properties of trapped single UCPs, beta-NaYF4:Yb,Er.
Mor, Flavio M. +3 more
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