Evaluation of Luminescence Properties of Single Hydrophilic Upconversion Nanoparticles by Optical Trapping

2019 ◽  
Vol 123 (15) ◽  
pp. 10107-10113 ◽  
Author(s):  
Ya-Feng Kang ◽  
Bei Zheng ◽  
Chong-Yang Song ◽  
Cheng-Yu Li ◽  
Zhi-Liang Chen ◽  
...  
Keyword(s):  
Optical Trapping ◽  
Luminescence Properties ◽  
Upconversion Nanoparticles

808 nm excited energy migration upconversion nanoparticles driven by a Nd3+–Trinity system with color-tunability and superior luminescence properties

Nanoscale ◽  
2018 ◽  
Vol 10 (6) ◽  
pp. 2790-2803 ◽  
Author(s):  
Shuai Guo ◽  
Ming-Kiu Tsang ◽  
Wai-Sum Lo ◽  
Jianhua Hao ◽  
Wing-Tak Wong
Keyword(s):  
Energy Migration ◽  
Luminescence Properties ◽  
Upconversion Nanoparticles ◽  
Heating Effects ◽  
Color Tunability

A novel nanostructure is fabricated with an 808 nm excited/Nd3+-sensitized EMU system to avoid over-heating effects, gained with favourable luminescence properties.

Synthesis and luminescence properties of NaGdF4: Yb3+, Ce3+, and Ho3+ upconversion nanoparticles doped with Zn2+

CrystEngComm ◽  
2018 ◽  
Vol 20 (19) ◽  
pp. 2663-2668 ◽  
Author(s):  
Ye Kuang ◽  
Jiating Xu ◽  
Chen Wang ◽  
Chuanqing Wang ◽  
Hua Shao ◽  
...  
Keyword(s):  
Crystal Lattice ◽  
Luminescence Properties ◽  
Upconversion Nanoparticles

Due to shrinkage of crystal lattice and formation of F− vacancies, the luminescence intensities show a rise-and-fall change with growing Zn2+ concentration in β-NaGdF4 UCNPs.

scholarly journals Upconversion NaYF4:Yb:Er nanoparticles co-doped with Gd3+ and Nd3+ for thermometry on the nanoscale

RSC Advances ◽  
2015 ◽  
Vol 5 (82) ◽  
pp. 67149-67156 ◽  
Author(s):  
D. T. Klier ◽  
M. U. Kumke
Keyword(s):  
Oleic Acid ◽  
Upconversion Luminescence ◽  
Crystal Phase ◽  
Luminescence Properties ◽  
Upconversion Nanoparticles ◽  
Temperature Range ◽  
Co Doped

The upconversion luminescence properties of oleic acid capped NaYF4:Gd3+:Yb3+:Er3+ upconversion nanoparticles (UCNP) with pure β crystal phase and Nd3+ ions as an additional sensitizer were studied in the temperature range of 288 K < T < 328 K.

Physiochemical properties of greatly enhanced photoluminescence of aqueous dispersible upconversion CaF2:Yb/Er nanoparticles

2017 ◽  
Vol 16 (6) ◽  
pp. 890-896 ◽  
Author(s):  
Anees A. Ansari ◽  
Ranvijay Yadav ◽  
S. B. Rai
Keyword(s):  
Metal Complex ◽  
Surface Coating ◽  
Luminescence Properties ◽  
Upconversion Nanoparticles ◽  
Physiochemical Properties ◽  
Enhanced Photoluminescence ◽  
Silica Layers

Highly aqueous soluble CaF2:Yb/Er@CaF2@SiO2 upconversion nanoparticles were prepared via metal complex decomposition rout. Gradually surface coating with an inert CaF2 and silica layers greatly enhanced their optical and luminescence properties, which are highly usable for luminescent biolabeling or optical bio-probe etc.

Upconversion, MRI imaging and optical trapping studies of silver nanoparticle decorated multifunctional NaGdF4:Yb,Er nanocomposite

2021 ◽  
Author(s):  
S. Yamini ◽  
Gunaseelan M ◽  
Ajithkumar Gangadharan ◽  
Silverio A Lopez ◽  
Karen Martirosyan ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Optical Trapping ◽  
Magnetic Measurement ◽  
Upconversion Luminescence ◽  
Resonance Effect ◽  
Optical Tweezer ◽  
Upconversion Nanoparticles ◽  
Chemical Compositions ◽  
Mri Imaging

Abstract The multifunctional upconversion nanoparticles are fascinating tool for biological applications. In the present work, photon upconverting NaGdF4:Yb,Er and Ag nanoparticles decorated NaGdF4:Yb,Er (NaGdF4:Yb,Er@Ag) nanoparticles were prepared using a simple polyol process. Rietveld refinement was performed for detailed crystal structural and phase fraction analysis. The morphology of the NaGdF4:Yb,Er@Ag was examined using HRTEM, which reveals silver nanoparticles of 8 nm in size were decorated over spherical shaped NaGdF4:Yb,Er nanoparticles with a mean particle size of 90 nm. The chemical compositions were confirmed by EDAX and ICP-OES analyses. The upconversion luminescence (UCL) of NaGdF4:Yb,Er at 980 nm excitation showed an intense red emission. After incorporating the silver nanoparticles, the UCL intensity decreased due to weak scattering and surface plasmon resonance effect (SPR). The VSM magnetic measurement indicates both the upconversion nanoparticles possess paramagnetic behaviour. The NaGdF4:Yb,Er@Ag showed CT imaging. MRI study exhibited better T1 weighted relaxivity in the NaGdF4:Yb,Er than the commercial Gd-DOTA. For the first time, the optical trapping was successfully demonstrated for the upconversion NaGdF4:Yb,Er nanoparticle at NIR 980 nm light using an optical tweezer setup. The optically trapped upconversion nanoparticle possessing paramagnetic property exhibited a good optical trapping stiffness. The UCL of trapped single UCNP is recorded to explore the effect of the silver nanoparticles. The multifunctional properties for the NaGdF4:Yb,Er@Ag nanoparticle are demonstrated.

scholarly journals Preparation and luminescence properties of monodisperse silica/aminosilane-coated Y2O3:Yb,Ho upconversion nanoparticles

2011 ◽  
Vol 56 (2) ◽  
pp. 137-141 ◽  
Author(s):  
Tao Pang ◽  
WangHe Cao ◽  
MingMing Xing ◽  
XiXian Luo ◽  
ShuJing Xu
Keyword(s):  
Luminescence Properties ◽  
Upconversion Nanoparticles ◽  
Monodisperse Silica

Luminescence from individual dislocations in II-VI and III-V semiconductors

1991 ◽  
Vol 49 ◽  
pp. 834-835
Author(s):  
J W Steeds
Keyword(s):  
Group Iv ◽  
Luminescence Properties ◽  
Carrier Recombination ◽  
Transmission Electron ◽  
Wide Range ◽  
Basic Physics ◽  
Semiconducting Compounds ◽  
Diamond Group ◽  
Non Destructive ◽  
Technological Significance

There is a wide range of experimental results related to dislocations in diamond, group IV, II-VI, III-V semiconducting compounds, but few of these come from isolated, well-characterized individual dislocations. We are here concerned with only those results obtained in a transmission electron microscope so that the dislocations responsible were individually imaged. The luminescence properties of the dislocations were studied by cathodoluminescence performed at low temperatures (~30K) achieved by liquid helium cooling. Both spectra and monochromatic cathodoluminescence images have been obtained, in some cases as a function of temperature.There are two aspects of this work. One is mainly of technological significance. By understanding the luminescence properties of dislocations in epitaxial structures, future non-destructive evaluation will be enhanced. The second aim is to arrive at a good detailed understanding of the basic physics associated with carrier recombination near dislocations as revealed by local luminescence properties.

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