Magnetic field modulated upconversion luminescence in NaYF4:Yb,Er nanoparticles

2015 ◽  
Vol 3 (34) ◽  
pp. 8794-8798 ◽  
Author(s):  
P. Chen ◽  
H. Jia ◽  
Z. Zhong ◽  
J. Han ◽  
Q. Guo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Transfer ◽  
Upconversion Luminescence

Magnetic field enhanced the upconversion luminescence for the enhanced energy transfer from Yb3+ to Er3+ in NaYF4 nanoparticles.

scholarly journals Upconversion Luminescence of Silica–Calcia Nanoparticles Co-doped with Tm3+ and Yb3+ Ions

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 937
Author(s):  
Katarzyna Halubek-Gluchowska ◽  
Damian Szymański ◽  
Thi Ngoc Lam Tran ◽  
Maurizio Ferrari ◽  
Anna Lukowiak
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Sol Gel ◽  
Emission Spectra ◽  
Transmission Electron ◽  
Characteristic Emission ◽  
Diffraction Patterns ◽  
Size Of Particles ◽  
Average Size

Looking for upconverting biocompatible nanoparticles, we have prepared by the sol–gel method, silica–calcia glass nanopowders doped with different concentration of Tm3+ and Yb3+ ions (Tm3+ from 0.15 mol% up to 0.5 mol% and Yb3+ from 1 mol% up to 4 mol%) and characterized their structure, morphology, and optical properties. X-ray diffraction patterns indicated an amorphous phase of the silica-based glass with partial crystallization of samples with a higher content of lanthanides ions. Transmission electron microscopy images showed that the average size of particles decreased with increasing lanthanides content. The upconversion (UC) emission spectra and fluorescence lifetimes were registered under near infrared excitation (980 nm) at room temperature to study the energy transfer between Yb3+ and Tm3+ at various active ions concentrations. Characteristic emission bands of Tm3+ ions in the range of 350 nm to 850 nm were observed. To understand the mechanism of Yb3+–Tm3+ UC energy transfer in the SiO2–CaO powders, the kinetics of luminescence decays were studied.

scholarly journals Magnetopause energy transfer dependence on the interplanetary magnetic field and the Earth's magnetic dipole axis orientation

2012 ◽  
Vol 30 (3) ◽  
pp. 515-526 ◽  
Author(s):  
M. Palmroth ◽  
R. C. Fear ◽  
I. Honkonen
Keyword(s):  
Magnetic Field ◽  
Energy Transfer ◽  
Interplanetary Magnetic Field ◽  
Large Data ◽  
Seasonal Effect ◽  
Dipole Orientation ◽  
Data Set ◽  
Axis Orientation ◽  
Simulation Results ◽  
The Imf

Abstract. We examine the spatial variation of magnetospheric energy transfer using a global magnetohydrodynamic (MHD) simulation (GUMICS-4) and a large data set of flux transfer events (FTEs) observed by the Cluster spacecraft. Our main purpose is to investigate whether it is possible to validate previous results on the spatial energy transfer variation from the GUMICS-4 simulation using the statistical occurrence of FTEs, which are manifestations of magnetospheric energy transfer. Previous simulation results have suggested that the energy transfer pattern at the magnetopause rotates according to the interplanetary magnetic field (IMF) orientation, and here we investigate whether a similar rotation is seen in the locations at which FTE signatures are observed. We find that there is qualitative agreement between the simulation and observed statistics, as the peaks in both distributions rotate as a function of the IMF clock angle. However, it is necessary to take into account the modulation of the statistical distribution that is caused by a bias towards in situ FTE signatures being observed in the winter hemisphere (an effect that has previously been predicted and observed in this data set). Taking this seasonal effect into account, the FTE locations support the previous simulation results and confirm the earlier prediction that the energy transfers in the plane of the IMF. In addition, we investigate the effect of the dipole orientation (both the dipole tilt angle and its orientation in the plane perpendicular to the solar wind flow) on the energy transfer spatial distribution. We find that the energy transfer occurs mainly in the summer hemisphere, and that the dayside reconnection region is located asymmetrically about the subsolar position. Finally, we find that the energy transfer is 10% larger at equinox conditions than at solstice, contributing to the discussion concerning the semiannual variation of magnetospheric dynamics (known as "the Russell-McPherron effect").

Highly Enhanced Cooperative Upconversion Luminescence through Energy Transfer Optimization and Quenching Protection

2016 ◽  
Vol 8 (28) ◽  
pp. 17894-17901 ◽  
Author(s):  
Meng Xue ◽  
Xingjun Zhu ◽  
Xiaochen Qiu ◽  
Yuyang Gu ◽  
Wei Feng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Upconversion Luminescence ◽  
Cooperative Upconversion

Upconversion luminescence, optical thermometric properties and energy transfer in Yb3+/Tm3+ co-doped phosphate glass

2018 ◽  
Vol 81 ◽  
pp. 78-83 ◽  
Author(s):  
Yong Chen ◽  
Guohua Chen ◽  
Xiangyu Liu ◽  
Jiwen Xu ◽  
Xiujuan Zhou ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Phosphate Glass ◽  
Upconversion Luminescence ◽  
Co Doped

A paper-supported sandwich immunosensor based on upconversion luminescence resonance energy transfer for the visual and quantitative determination of a cancer biomarker in human serum

The Analyst ◽  
2020 ◽  
Vol 145 (12) ◽  
pp. 4181-4187 ◽  
Author(s):  
Mengyuan He ◽  
Ning Shang ◽  
Lin Shen ◽  
Zhihong Liu
Keyword(s):  
Energy Transfer ◽  
Quantitative Determination ◽  
Human Serum ◽  
Upconversion Luminescence ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Cancer Biomarker

A portable and sensitive paper-supported sandwich immunosensor based on UC-FRET was developed for the visual and quantitative determination of CEA.

Red–green–blue upconversion luminescence and energy transfer in Yb3+/Er3+/Tm3+ doped YP5O14 ultraphosphates

2017 ◽  
Vol 181 ◽  
pp. 393-399 ◽  
Author(s):  
M.A. Hassairi ◽  
M. Dammak ◽  
D. Zambon ◽  
G. Chadeyron ◽  
R. Mahiou
Keyword(s):  
Energy Transfer ◽  
Upconversion Luminescence

Excitation efficiency determines the upconversion luminescence intensity of β-NaYF4:Er3+,Yb3+ nanoparticles in magnetic fields up to 70 T

Nanoscale ◽  
2020 ◽  
Vol 12 (39) ◽  
pp. 20300-20307 ◽  
Author(s):  
Anna Borodziuk ◽  
Michał Baranowski ◽  
Tomasz Wojciechowski ◽  
Roman Minikayev ◽  
Bożena Sikora ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Luminescence Intensity ◽  
Upconversion Luminescence ◽  
Excitation Efficiency ◽  
The Magnetic Field

We resolve a long standing discrepancy between various reports on the effect of the magnetic field on up-converted luminescence.

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