Journal of Materials Chemistry C
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2024
·Vol. 12
·期 28
·10504-10512
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IF 5.7
Jingshan Hou,Zhiyu Qin,Jianghua Wu,Tong Li,Langping Dong,Ganghua Zhang,Guoying Zhao,Yufeng Liu,Haijie Chen,Yongzheng Fang
A novel Mn2+ doped ScTaO4 phosphor was synthesized through a high temperature solid state method and its photoluminescence properties were systematically investigated. The ScTaO4:Mn2+ phosphor exhibited two emission bands centered at 478 nm and 661 nm under UV excitation, attributed to the self-activated emission of the host and the 4T1 → 6A1 transition emission from doped Mn2+ ions, respectively. Through optimizing the concentration of doped Mn2+ ions, white light emission was achieved. Meanwhile, the temperature-dependent luminescence spectra of the ScTaO4:Mn2+ phosphor (in the range from 298 K to 523 K) revealed significantly different thermal quenching behaviors between the host and Mn2+ ions, which cause a notable change in the fluorescence intensity ratio of the host versus Mn2+ ions and enable high absolute and relative sensitivities, with maximum values of 0.0172 K−1 and 2.1% K−1 at 523 K, respectively. The results indicated that the as-prepared STO:Mn2+ phosphor can be a potential candidate material for high temperature optical thermometry.
研究领域:
材料科学
·
光学
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Lin Chen,Mingyu Hu,Jun Guo,Xiaoyu Chong,Jing Feng
As candidate thermal/environmental barrier coatings (T/EBCs), the structure characteristics and comprehensive properties of monoclinic-prime (m') RETaO 4 (RE = Yb, Lu, Sc) with excellent Al 2 O 3 /SiO 2 chemical compatibility are studied. Excellent thermal insulation protection will be provided by m'RETaO 4 due to their low thermal conductivity (∼1.6 W m −1 K −1 , 900 °C) and prominent thermal radiation resistance, which is much better than those of YSZ (∼2.5 W m −1 K −1 , 1000 °C) and La 2 Zr 2 O 7 (∼2.0 W m −1 K −1 , 900 °C). The thermal expansion coefficients (TECs) are 3.0–8.0 × 10 -6 K −1 (200−1200 °C), which is suitable for T/EBCs applications. Furthermore, absence of phase transition and extraordinary chemical compatibility with Al 2 O 3 /SiO 2 up to 1500 °C indicate the potential application prospect. The documented governing mechanisms of m'RETaO 4 properties will enable researchers to promote their application in the future investigation.
研究领域:
材料科学
·
工程热物理
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高影响因子
ChemCatChem
·
2020
·Vol. 13
·期 1
·180-184
·
IF 4.853
Lang Pei,Hong Cai,Hao Jin,Taozhu Li,Heng Zhu,Yongjun Yuan,Jiasong Zhong,Shicheng Yan,Zhigang Zou
Graphical Photocatalysis : A nitrogen-doped tunable tunneled oxide ScTaO 4−x N x with an absorption edge of ca. 540 nm is identified as a narrow bandgap bifunctional photocatalyst for photocatalytic OER and HER. Screening of visible-light-responsive semiconductor photocatalysts is a significant target for solar water splitting systems. Herein, a newly designed Ta-based oxynitride, namely ScTaO 4−x N x , was successfully synthesized via nitrogen doping of ScTaO 4 oxide precursors at 1273 K under NH 3 flow. The ScTaO 4−x N x photocatalyst, with a strong band-to-band visible light absorption as far as 540 nm, can be employed for both water oxidation and reduction half-reactions under visible light illumination, demonstrating great potential for photocatalytic water splitting.
研究领域:
材料科学
·
能源化学
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高影响因子
Current Optics and Photonics
·
2025
·Vol. 9
·期 3
·224-232
·
IF 0.8
Junfeng Wang,Junfeng Wang,Wenpeng Liu,Shoujun Ding,Shoujun Ding,Guihua Sun,Gang Liu
A series of x at% Sm3+ (x = 0.5, 1, 3, 5, 8, 10) doped ScTaO4 phosphors were prepared using a high-temperature solid-state method. The synthesized samples were structurally characterized by using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy, and the diffraction data were fitted to the full spectrum. At the same time, the electronic structure (energy band and state density) and differential charge of the ScTaO4 host material were calculated. The results showed that ScTaO4 has a direct band gap with a width of 4.14 eV. The effect of Sm3+ ion doping concentrations on the emission spectrum was further explored, and the 3 at% Sm3+ ion doping concentration was selected to have the best luminescence effect. In addition, we measured the temperature-changing spectrum of the 3 at% Sm3+ doped sample in the temperature range of 300–510 K to evaluate the thermal stability of its photoluminescence spectrum. At 390 K, the emission peak intensity at 610 nm of the 3 at% Sm3+ doped sample was still 79.55% of that at room temperature, showing excellent thermal stability. At the same time, we explored the temperature quenching mechanism of the material and fitted the variable temperature spectrum to obtain the activation energy (E
a) of the phosphor as 0.187 eV. The results show that Sm3+:ScTaO4 orange-red phosphor is expected to be used in the field of white LED lighting.Published by the Optical Society of Korea under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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高影响因子
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