Results 21 to 30 of about 7,192 (202)
Phonon-assisted up-conversion photoluminescence of quantum dots
Nature Communications, 2021 Up-conversion photoluminescence in colloidal quantum dots is generally believed to be mediated by thermal activation from defect states. Here, the authors reveal that highly-efficient up-conversion photoluminescence instead is related to electron-phonon ...
Zikang Ye +6 more
doaj +1 more source
Crystals, 2021 As a development on previous research on single crystals of Pr3+-doped yttria-stabilized zirconia (YSZ), we report here the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3 concentrations.
Daini Wang +5 more
doaj +1 more source
Science and Technology of Advanced Materials, 2021 Advancing the upconversion materials field relies on accurate and contrastable photoluminescence efficiency measurements, which are characterised by the absolute upconversion quantum yield (UCQY).
Callum M. S. Jones +2 more
doaj +1 more source
Enhancing upconversion photoluminescence by plasmonic-photonic hybrid mode
Optics Express, 2020 Upconversion photoluminescence (UCPL) of rare-earth ions has attracted much attention due to its potential application in cell labeling, anti-fake printing, display, solar cell and so forth. In spite of high internal quantum yield, they suffer from very low external quantum yield due to poor absorption cross-section of rare-earth ions.
Yuan Gao +5 more
openaire +2 more sources
Growth, processing, and optical properties of epitaxial Er_2O_3 on silicon [PDF]
, 2008 Erbium-doped materials have been investigated for generating and amplifying light in low-power chip-scale optical networks on silicon, but several effects limit their performance in dense microphotonic applications.
Atanackovic, P. B. +10 more
core +1 more source
Unveiling room temperature upconversion photoluminescence in monolayer WSe2
Optics Express, 2022 Upconversion photoluminescence (UPL) is a phenomenon describing an anti-Stokes process where the emitted photons have higher energy than the absorbed incident photons. Transition metal dichalcogenides (TMDCs) with strong photon-exciton interactions represent a fascinating platform for studying the anti-Stokes UPL process down to the monolayer thickness
Aamir Mushtaq, Xiaodong Yang, Jie Gao
openaire +2 more sources
Unconventional photoluminescence upconversion from PbS quantum dots [PDF]
Applied Physics Letters, 2007 The authors report a type of photoluminescence upconversion that is directly attributable to the strong quantum confinement of charge carriers in PbS nanocrystals and does not involve the usual mechanism of thermally populated intermediate states. Absorption, emission, and excitation spectroscopy, combined with a simple spectral model, reveals that the
Fernee, M.J. +2 more
openaire +2 more sources
Photon avalanche in nanoluminophore obtained by REE silicate evaporation
Results in Optics, 2021 A bulk phosphor composition Sr2Y6.8YbEr0.2Si6O26 was synthesized. A nanophosphorus in an amorphous state was obtained from this sample by the method of pulsed electron beam evaporation.
M.G. Zuev +3 more
doaj +1 more source
Photonic crystal-driven spectral concentration for upconversion photovoltaics [PDF]
, 2015 International audienceThe main challenge for applying upconversion (UC) to silicon photovoltaics is the limited amount of solar energy harvested directly via erbium-based upconverter materials (24.5 W m(-2)).
Abargues, Rafael +5 more
core +1 more source
Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3 [PDF]
, 2018 We report the exotic photoluminescence (PL) behaviour of 3D topological insulator Bi2Te3 single crystals grown by customized self-flux method and mechanically exfoliated few layers (18 plus minus 2 nm)/thin flakes obtained by standard scotch tape method ...
Auluck, S. +10 more
core +2 more sources