Results 31 to 40 of about 9,394 (232)

Upconversion Nanomaterials: Synthesis, Mechanism, and Applications in Sensing

Sensors, 2012
Upconversion is an optical process that involves the conversion of lower-energy photons into higher-energy photons. It has been extensively studied since mid-1960s and widely applied in optical devices. Over the past decade, high-quality rare earth-doped
Julia Xiaojun Zhao, Jiao Chen
doaj   +1 more source

Upconversion nanoscopy revealing surface heterogeneity of tumor-secreted extracellular vesicles

Light: Science & Applications, 2023
Super-resolution microscopic imaging employing upconversion nanoparticles is applied to reveal the surface heterogeneity of tumor cell-derived small extracellular vesicles, i.e., exosome. The number of surface antigens of every extracellular vesicles can
Rui Pu, Qiuqiang Zhan
doaj   +1 more source

Multicolor Upconversion Nanoparticles for Protein Conjugation [PDF]

Theranostics, 2013
We describe the preparation of monodisperse, lanthanide-doped hexagonal-phase NaYF4 upconverting luminescent nanoparticles for protein conjugation. Their core was coated with a silica shell which then was modified with a poly(ethylene glycol) spacer and N-hydroxysuccinimide ester groups.
Wilhelm, Stefan, Hirsch, Thomas, Patterson, Wendy M., Scheucher, Elisabeth, Mayr, Thorsten, Wolfbeis, Otto S.   +5 more
openaire   +3 more sources

Correction: Video-rate upconversion display from optimized lanthanide ion doped upconversion nanoparticles. [PDF]

, 2023
Correction for 'Video-rate upconversion display from optimized lanthanide ion doped upconversion nanoparticles' by Laixu Gao et al., Nanoscale, 2020, DOI:
Liu, Y, Gao, L, Jin, D, Ma, C, Shan, X, Wen, S, Xu, X, Liu, B, Li, S, Wang, F   +9 more
core   +1 more source

Preparation of photon-upconversion nanoparticles

, 2021
The present work aimed to characterize photon-upconversion nanoparticles based on lanthanides. The synthesis of NaGdF4:Yb/Tm@NaGdF4:Eu core-shell nanoparticles using a europium activator was designed based on the available literature.
Kelarová, Štěpánka
core   +1 more source

The Bioavailability, Biodistribution, and Toxic Effects of Silica-Coated Upconversion Nanoparticles in vivo

Frontiers in Chemistry, 2019
Lanthanide-doped upconversion nanoparticles can convert long wavelength excitation radiation to short wavelength emission. They have great potential in biomedical applications, such as bioimaging, biodetection, drug delivery, and theranostics.
Mingzhu Zhou, Xiaoqian Ge, Da-Ming Ke, Huan Tang, Jun-Zheng Zhang, Matteo Calvaresi, Bin Gao, Lining Sun, Qianqian Su, Haifang Wang   +9 more
doaj   +1 more source

Upconversion Luminescence Response of a Single YVO₄:Yb, Er Particle

Micromachines, 2023
We present the results of the luminescence response studies of a single YVO4:Yb, Er particle of 1-µm size. Yttrium vanadate nanoparticles are well-known for their low sensitivity to surface quenchers in water solutions which makes them of special ...
Dmitry K. Zharkov, Andrey V. Leontyev, Artemi G. Shmelev, Larisa A. Nurtdinova, Anton P. Chuklanov, Niaz I. Nurgazizov, Victor G. Nikiforov   +6 more
doaj   +1 more source

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, Mathieu, Pasturel, Aude, Bouchet, Michel, Sliwa, Jean-Claude, Micheau, Fabienne, Gauffre, Ute, Resch-Genger, Christophe, Coudret, Pierre, Roblin, Clément, Roux, Ali, Eftekhari, Christian, Würth   +11 more
core   +1 more source

Switching the NIR upconversion of nanoparticles for the orthogonal activation of photoacoustic imaging and phototherapy

Nature Communications, 2022
Upconversion nanoparticles can be used to both image and treat tumors. Here, the authors describe an upconversion nanoparticle that can switch from imaging to phototherapy by altering the NIR emission.
Yang Yang, Jinshu Huang, Wei Wei, Qin Zeng, Xipeng Li, Da Xing, Bo Zhou, Tao Zhang   +7 more
doaj   +1 more source

A Method for the Growth of Uniform Silica Shells on Different Size and Morphology Upconversion Nanoparticles

, 2021
Lanthanide-doped upconversion nanoparticles have emerged as attractive candidates for biomedical applications. This is due to their excitation and emission wavelengths, which lay the foundation for deeper penetration depth into biological tissue, higher ...
Maria Eleni, Kyriazi, Elena, Ureña-Horno, Antonios, Kanaras   +2 more
core   +1 more source