scholarly journals Synthesis of Si, N co-Doped Nano-Sized TiO2 with High Thermal Stability and Photocatalytic Activity by Mechanochemical Method

Nanomaterials ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 294 ◽  
Author(s):  
Peisan Wang ◽  
Chunxia Qi ◽  
Pengchao Wen ◽  
Luyuan Hao ◽  
Xin Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photocatalytic Activity ◽  
High Thermal Stability ◽  
Mechanochemical Method ◽  
Co Doped

scholarly journals Study on Upconversion and Thermal Properties of Tm3+/Yb3+ Co-Doped La2O3-Nb2O5-Ta2O5 Glasses

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1352 ◽  
Author(s):  
Minghui Zhang ◽  
Haiqin Wen ◽  
Xiuhong Pan ◽  
Jianding Yu ◽  
Hui Shao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Upconversion Luminescence ◽  
Solid State Laser ◽  
Glass Forming Ability ◽  
High Thermal Stability ◽  
Temperature Sensing ◽  
Glass Forming ◽  
Dta Analysis ◽  
Co Doped

The effect of Yb3+ ions on upconversion luminescence and thermal properties of Tm3+/Yb3+ co-doped La2O3-Nb2O5-Ta2O5 glasses has been studied. Glass transition temperature is around 740 °C, indicating high thermal stability. The effect of Yb3+ ions on the thermal stability is not obvious. Both the glass forming ability and the upconversion luminescence first increase and then decrease with the increase of Yb3+ ions. The glasses perform low glass forming ability with ΔT around 55 °C. Blue and red emissions centered around 477, 651, and 706 nm are obtained at the excitation of 976 nm laser. The upconversion luminescence mechanism is energy transfer from Yb3+ to Tm3+ mixed with two- and three- photon processes. The thermal kinetic Differential Thermal Analysis (DTA)-analysis indicates that the average activation energy first increases and then decreases with the increase of Yb3+ ions. This result can be introduced in order to improve upconversion luminescence of glasses by crystallization in the future. Tm3+/Yb3+ co-doped La2O3-Nb2O5-Ta2O5 glasses with good upconversion and thermal properties show promising applications in solid-state laser, optical temperature sensing.

scholarly journals High Thermal Stability Apatite Phosphors Ca2La8(SiO4)6O2:Dy3+/Sm3+ for White Light Emission: Synthesis, Structure, Luminescence Properties and Energy Transfer

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ning Liu ◽  
Lefu Mei ◽  
Libing Liao ◽  
Jie Fu ◽  
Dan Yang
Keyword(s):  
Thermal Stability ◽  
Energy Transfer ◽  
White Light ◽  
Single Phase ◽  
Light Emission ◽  
High Thermal Stability ◽  
White Light Emission ◽  
Luminescence Properties ◽  
Potential Candidate ◽  
Co Doped

Abstract What ideal w-LED phosphors always aim to do is to achieve a single phase near-sunlight emission phosphor simultaneously with both high luminescence efficiency and high thermal stability at operation temperature. And It is well known that apatite compound phosphors are one of the most promising optical materials to realize those above because of their unique structure enhanced luminescence properties and thermal stability. Here, we synthesized a co-doped single phase apatite phosphors Ca2La8(SiO4)6O2:Dy3+/Sm3+ (CLSO:Dy3+/Sm3+) for white light emission, which was provided with excellent thermal stability and of which luminescence intensity at 150 °C still was 92 percentage of that at room temperature. Moreover, X-ray diffraction technique, Fourier transform infrared spectroscopy, scanning electron microscope were employed to characterization of phase structure and morphology, and consequently pure apatite structure and gravel-like morphology of phosphors were proved. Analysis of photoluminescence spectra indicated that concentration quenching effect exist in single-doped CLSO:Dy3+ phosphors owing to dipole-dipole interaction between Dy3+ ions. It is revealed that maybe exist Dy3+ ↔ Sm3+ bilateral non-radiative energy transfer processes in Dy3+/Sm3+ co-doped CLSO system by PL spectra and decay curves. And variation of Sm3+ ion concentration can control color emission, namely CIE chromaticity coordinates and correlated color temperature, finally to achieve white light emission (0.309,0.309) with CCT 6848 K, able to be a potential candidate for commercial lighting applications.

Uniform anatase single-crystal cubes with high thermal stability fully enclosed by active {010} and {001} facets

RSC Advances ◽  
2015 ◽  
Vol 5 (15) ◽  
pp. 11029-11035 ◽  
Author(s):  
Meicheng Wen ◽  
Peijue Liu ◽  
Shuning Xiao ◽  
Kohsuke Mori ◽  
Yasutaka Kuwahara ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photocatalytic Activity ◽  
Single Crystal ◽  
High Energy ◽  
High Thermal Stability ◽  
Green Method

Uniform cubic anatase TiO2 fully enclosed by high energy facets was prepared using green method for enhancing the photocatalytic activity.

One-step calcination synthesis of WC-Mo2C heterojunction nanoparticles as novel H2-production cocatalysts for enhanced photocatalytic activity of TiO2

2021 ◽  
Author(s):  
Lulu Gao ◽  
Jinfeng Liu ◽  
Haoyu Long ◽  
Ping Wang ◽  
Huogen Yu
Keyword(s):  
Thermal Stability ◽  
Photocatalytic Activity ◽  
Molybdenum Carbide ◽  
High Efficiency ◽  
H2 Production ◽  
High Thermal Stability ◽  
Adsorption Potential ◽  
H2 Generation ◽  
One Step ◽  
Photocatalytic H2 Generation

Hexagonal molybdenum carbide (Mo2C) as a high-efficiency non-noble cocatalyst has been widely applied in the photocatalytic H2-generation area due to its platinum-like H+-adsorption potential, high thermal stability, and excellent electrochemistry...

Adjustable white luminescence and high thermal stability in Eu2+/Eu3+/Tb3+/Al co-doped aluminosilicate oxyfluoride glass

2020 ◽  
Vol 846 ◽  
pp. 156435
Author(s):  
YaDan Ma ◽  
XiuSha Peng ◽  
MingZhi Fei ◽  
WenNa Zhang ◽  
LiMing Teng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Thermal Stability ◽  
Oxyfluoride Glass ◽  
White Luminescence ◽  
Co Doped

Fabrication of crystalline porphyrinic polyoxometalate cluster with high thermal stability and exploration of its photocatalytic activity

Polyhedron ◽  
2017 ◽  
Vol 121 ◽  
pp. 95-100 ◽  
Author(s):  
Junyong Zhang ◽  
Chunhua Gong ◽  
Xianghua Zeng ◽  
Jiahui Shu ◽  
Pingxiu Xiao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photocatalytic Activity ◽  
High Thermal Stability
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