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Luminescence upconversion in colloidal double quantum dots
Nature Nanotechnology, 2013Luminescence upconversion nanocrystals capable of converting two low-energy photons into a single photon at a higher energy are sought-after for a variety of applications, including bioimaging and photovoltaic light harvesting. Currently available systems, based on rare-earth-doped dielectrics, are limited in both tunability and absorption cross ...
Z. Deutsch, L. Neeman, D. Oron
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Upconversion luminescence imaging of cells and small animals
Nature Protocols, 2013Upconversion luminescence (UCL) is an anti-Stokes process whereby low-energy photons are converted to higher-energy ones. UCL imaging for cells and animal tissues has attracted substantial attention in recent years because of the unique abilities of upconversion materials, which can minimize the background interference from the autofluorescence of ...
Qian, Liu +4 more
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Solvent-Induced Luminescence Variation of Upconversion Nanoparticles
Langmuir, 2016Solvent plays a vital role in the syntheses, purifications, and broad applications of upconversion nanoparticles (UCNPs). In this work, the effect of various dispersive solvents, including single solvents and mixed solvents, on the luminescence properties of NaYF4:Yb3+, Er3+ UCNPs was studied systematically.
Tie, Cong +5 more
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Upconversion Luminescent Materials: Properties and Luminescence Mechanisms
2019The upconversion (UC) luminescent materials typically refer to the materials doped with rare earth (RE) ions or transition metal ions as the luminescence centers, among which the lanthanides ions possess superior UC efficiency. UC luminescence (UCL) is a kind of anti-Stokes process, which absorbs two or more photons with a low energy while emits one ...
Dandan Song, Suling Zhao, Zheng Xu
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EL2-Induced Upconversion Luminescence In GaAs
MRS Proceedings, 1996AbstractNear band gap luminescence in bulk-grown semi-insulating GaAs is excited in a two step process via the EL2 defect. While the conventionally excited photoluminescence of our samples is dominated by conduction band to acceptor transitions, the upconversion process selectively excites donor acceptor pair transitions.
V. Alex, T. Iino
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Upconversion Luminescence of Molecular Lanthanide Complexes
Chemistry – A European JournalABSTRACT Upconversion luminescence (UCL) materials based on the molecular lanthanide complexes have garnered increasing attention in diverse frontier fields in recent years. Compared with the intensively investigated lanthanide‐doped upconversion nanoparticles (UCNPs), the development of UCL lanthanide complexes needs strengthening ...
Wen Lu +3 more
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A Plasmonic Platform for Upconversion Luminescence Enhancement
ECS Meeting Abstracts, 2020The approach to adapt upconversion nanoparticles to plasmonic structures has been studied to improve their inherent low quantum efficiency. However, the metal-based plasmonic structures have limits in extending their applications since they are rigid and opaque. In this study, we demonstrate a plasmonic film composed of an array of microbeads, which
Jae-Min Shin, In-Hwan Ahn, Doo-Hyun Ko
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Luminescence upconversion in GaAs quantum wells
Physical Review B, 2008Photoluminescence upconversion removes energy from the medium. It has been applied extensively for laser cooling of atomic vapors and more recently also to condensed matter, such as dye solutions and glasses. The application to semiconductors has also been proposed, but so far, clear evidence is missing.
Soheyla Eshlaghi +3 more
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Functionalized upconversion luminescent nanoparticles for theranostics
Diffuse Optical Spectroscopy and Imaging VII, 2019The luminescence spectra of upconversion nanoparticles (UCNPs) and functionalized UCNPs (UCNPs+folic acid) delivered via subcutaneous and intratumor injection into rats were measured. The particles in normal skin do not diffuse and dissolve, but remain at the introduction site.
Irina Yu K. Yanina +5 more
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Controllable Multicolor Upconversion Luminescence by Tuning the NaF Dosage
Chemistry – An Asian Journal, 2013AbstractMulticolor upconversion (UC) luminescence of NaYF4:Yb3+/Er3+ nanoparticles (NPs) was successfully tuned by simply controlling the NaF dosage. Unlike UC nanocrystals previously reported in the literature with multicolor emission obtained by varying the rare‐earth dopants, the current work developed a new approach to tune the UC emission color by
Hao, Li, Leyu, Wang
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