A5021859746- Luminescence Properties of Advanced Materials
- Inorganic Fluorides and Related Compounds
- Glass properties and applications
- Advanced Photocatalysis Techniques
- Luminescence and Fluorescent Materials
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Dielectric properties of ceramics
- Analytical Chemistry and Sensors
- Optical properties and cooling technologies in crystalline materials
- Lanthanide and Transition Metal Complexes
- Silicon and Solar Cell Technologies
- Radiation Detection and Scintillator Technologies
- Terahertz technology and applications
- Silicon Nanostructures and Photoluminescence
- Inorganic Chemistry and Materials
- TiO2 Photocatalysis and Solar Cells
- Thin-Film Transistor Technologies
- Perovskite Materials and Applications
- Forensic Fingerprint Detection Methods
- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
Vietnam National University Ho Chi Minh City
2016-2024
Ho Chi Minh City University of Science
2014-2024
China Southern Power Grid (China)
2024
Hexagonal NaYF4:Tm, Yb upconversion (UC) phosphors with excellent UC luminescence quantum efficiency and chemical stability meet demands for applications in bioimaging anti-counterfeiting printing. In this work, a series of microparticles (UCMPs) different concentrations were synthesized by hydrothermal method. Then, the UCMPs become hydrophilic through surface oxidation oleic acid (C-18) ligand to azelaic (C-9) using Lemieux-von Rodloff reagent. The structure morphology investigated X-ray...
Doped ZnO thin films have attracted much attention in the research community as front-contact transparent conducting electrodes film silicon solar cells. The prerequisite both low resistivity and high transmittance visible near-infrared region for hydrogenated microcrystalline or amorphous/microcrystalline tandem cells has promoted further improvements of this material. In work, we propose combination major Ga minor impurities codoped (IGZO) to improve optoelectronic properties. A wide range...
NaYF4:Er,Yb upconversion luminescent nanoparticles (UCNPs) were prepared by hydrothermal methods at 180 °C for 24 h. The X-ray diffraction (XRD) and TEM (transmission electron microscopy) images show that the resulting 60 nm UCNPs possess a hexagonal structure. In this work, maleic anhydride (MA) was grafted on surface of to induce hydrophilic properties. photoluminescence spectra (PL) emissions centered around 545 660 under excitation 980 nm. inks, including UCNPs@MA, polyvinyl alcohol...
Introduction: In this study, NaYF4:Tm,Yb upconversion microparticles were prepared by a hydrothermal method. Methods: The effects of fabrication parameters such as rare earth concentration, reaction temperature and time on the structure luminescence properties materials studied X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), photoluminescence spectroscopy (PL). Depending time, morphology is either nanoparticle or branched structure. Results: crystallite size...
Dielectric properties of <TEX>$xBaTiO_3-(1-x)CoFe_2O_4$</TEX> composite materials have been investigated. <TEX>$BaTiO_3$</TEX>, <TEX>$CoFe_2O_4$</TEX> and <TEX>$0.5BaTiO_3-0.5CoFe_2O_4$</TEX> samples show frequency dependence, which is classified as relaxor behavior with different relaxing degree. The behaviors were described using the modified Curier-Weiss Vogel-Fulcher laws. Among three above samples, <TEX>$BaTiO_3$</TEX> sample has highest Photoluminescence spectral indicated defects,...
Undoped SnO 2 and erbium-doped powders were successfully prepared by precipitation method. The effect of the heat treatment doping contents on structure tin oxide optical properties was also studied. XRD data Raman spectra indicate that crystals have formed after being heat-treated at 400°C average size grains is about 8 nm for content 1 mol%. An increase concentration has controlled growth nanocrystals. principle visible infrared emissions :Er discussed. All photoluminescence study shows Er...
Solid insulation materials undertake important tasks in power insulation. For the analysis of fillers solid insulation, there are few non-destructive testing methods currently used, and accuracy is not high. The destructive samples high, such as thermogravimetric analysis, but operation complicated requirements which cannot meet rapid silicone rubber. In this paper, rubber commonly used insulating taken research object, different made by changing filler content rubber, a terahertz...
Abstract A series of TiO 2 :xEr powders (with x from 0% to 1% at.) was synthesised by a simple sol–gel process. The structural and optical properties were studied in detail using diffusion reflection spectroscopy, x-ray diffraction, Raman high-resolution transmission electron microscopy, energy-dispersive systematically determine the band edge, morphology, both undoped Er-doped samples. Notably, introduction Er dopants matrix results decrease gap crystallite size as well anatase phase host...
In our study, hexagonal-NaYF4: Eu3+ nanoparticles were synthesized by the solvothermal method at 180◦C for 24 hours. The typical vibrational spectrum showed appearance of characteristic organic modes oleic acid in sample. presence elements such as Na, Y, F and Eu was indicated energy-dispersive X-ray spectroscopy (EDX). diffraction (XRD) patterns revealed that NaYF4 host possessed hexagonal structure when doping contents below 5 mol%. At amount 10 mol%, XRD appeared additional peaks cubic...