Results 41 to 50 of about 19,577 (268)
Avalanche upconversion in Tm:YALO_3 [PDF]
Optics Letters, 1991 We report the sudden appearance of upconversion fluorescence and resonant increasing absorption above a threshold intensity in Tm YALO3 at room temperature. These effects are shown to arise from nonlinear, cooperative, excited-state dynamics. Comparison with quantum theory reveals essential roles both for pairwise cross relaxation and excitation ...
H, Ni, S C, Rand
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Scientific Reports, 2018 The multiplexing capacity of conventional fluorescence materials are significantly limited by spectral overlap and background interference, mainly due to their short-lived fluorescence lifetimes.
Heng Qin +5 more
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Upconversion nanoparticles for bioimaging
Nanotechnology Reviews, 2017 Fluorescent labeling is a widely used indispensable tool in biology. Conventional downconversion fluorescence labels with ultraviolet or short-wavelength excitation suffer from autofluorescence, low signal-to-noise ratio, and incident photo damage to ...
Song Chenxi +5 more
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Metal oxides for efficient infrared to visible upconversion
, 2011 Upconversion phosphor materials are attracting considerable attention for their possible applications in solar cells with improved efficiency, nanomaterials for bio-imaging, lasers and novel display technologies.
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Green-to-Blue Triplet Fusion Upconversion Sensitized by Anisotropic CdSe Nanoplatelets
, 2020 Green-to-blue photon upconversion bears great potential in photocatalytic applications. However, current hybrid inorganic-organic upconversion schemes utilizing spherical CdSe nanocrystals are often limited by energetic polydispersity, low quantum yields
Lea, Nienhaus +3 more
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Ultra-stable near-infrared Tm3+-doped upconversion nanoparticles for in vivo wide-field two-photon angiography with a low excitation intensity [PDF]
Journal of Innovative Optical Health Sciences, 2019 Two-photon luminescence with near-infrared (NIR) excitation of upconversion nanoparticles (NPs) is of great importance in biological imaging due to deep penetration in high-scattering tissues, low auto-luminescence and good sectioning ability ...
Wen Liu, Runze Chen, Sailing He
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Crystals, 2023 Scientists are increasingly interested in new inorganic luminescence materials that could be excited with near-infrared (NIR) radiation. These materials can be used as luminescent thermometers, bio-imaging agents, anti-counterfeiting pigments, etc.
Julija Grigorjevaite +1 more
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Photochemical upconversion in water
Chem. Commun., 2017 The current investigation achieves photochemical upconversion in pure water using combinations of water soluble Ru(ii) metal-to-ligand charge transfer (MLCT) sensitizers in concert with 9-anthracenecarboxylate (AnCO2−) and 1-pyrenecarboxylate (PyCO2−).
Karim A. El Roz, Felix N. Castellano
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Synthesis and emission dynamics of sub-3 nm upconversion nanoparticles
, 2023 Reducing the size of upconversion nanoparticles (UCNPs) down to a few nm yields unique luminescent materials containing a very small number of emitters.
Baptiste, Amouroux +11 more
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Upconversion-Triggered Charge Separation in Polymer Semiconductors
, 2017 Upconversion is a unique optical property which is driven by a sequential photon pumping and generation of higher energy photons in a consecutive manner.
Kim, Dong-Wook +19 more
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