OPTICAL MATERIALS
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2019
·
IF 2.687
Xiuna Tian,Hongjian Dou,Lingyuan Wu
Upconversion (UC) luminescent materials have received much attention due to their unique luminescent properties and potential applications in various fields. Yb 3+ /Tm 3+ codoped NaBiF 4 UC material has been successfully synthesized through a solvothermal method. With the excitation of 980 nm laser light, NaBiF 4 :Yb 3+ /Tm 3+ powder show strong UC luminescence. Especially, the near-infrared (NIR) UC emission band of NaBiF 4 :Yb 3+ /Tm 3+ centered at 800 nm is 49 times stronger than the blue emission band. The temperature-dependent UCL properties of NaBiF 4 :Yb 3+ /Tm 3+ were investigated systematically under 980 nm excitation. The results show that all the UC emission peaks of NaBiF 4 : Yb 3+ /Tm 3+ in the region from 300 to 900 nm decrease with the temperature increase except for the emission peak at 697 nm which is positively correlated with temperature. And the UC emissions of NaBiF 4 : Yb 3+ /Tm 3+ exhibits high temperature sensitivity between 303 and 443 K. Therefore, NaBiF 4 : Yb 3+ /Tm 3+ material with strong NIR UCL could be a potential candidate for sensitive temperature sensor .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2020
·Vol. 20
·期 10
·6257-6265
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IF 1.134
Yu Jiaming,Wang Yumeng,He Yuxuan,Li Huiling,Cheng Qian,Li Yu
Hollow upconversion luminescence nanomaterials have widespread applications in drug delivery, high efficiency catalysis, as well as energy storage owes to super-large specific surface area, cavity volume, and fluorescence properties. However, a series of complex processes and high temperature
is required for the synthesis of these materials. Herein, a facile template-free coprecipitation route based on the Kirkendall diffusion process at room temperature had been developed to synthesize hollow NaBiF4:Yb3+/Er3+ nanospheres with upconversion luminescence.
X-ray diffraction (XRD), nitrogen adsoption/desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy and upconversion emission spectra demonstrated the successful preparation of NaBiF4:Yb3+/Er3+
nanospheres with pervasive hollow morphology, relatively high specific surface area, and excellent upconversion luminescence properties. Moreover, the influence of some reaction parameters on the morphology and structure of the obtained samples were systematically explored. Additionally, the
evolution mechanism of the hollow structure nanospheres was analyzed on account of the Kirkendall diffusion process related to the solid–liquid interfacial ion migration. It is expected that these hollow upconversion NaBiF4:Yb3+/Er3+ nanospheres with
upconversion luminescence prepared by this type of synthetic strategy will have widespread medical, environmental, and energy applications.
研究领域:
材料科学
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纳米医学
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光学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2019
·
IF 2.846
Zaifa Pan,Yingting Wen,Tao Wang,Kai Wang,Yuanjie Teng,Kang Shao
Novel PEI-modified NaBiF 4 :Yb 3+ /Er 3+ upconversion nanoparticles (UCNPs) with hollow structure were prepared by a surface modification free one-step solvothermal method and applied as a luminescent probe to determinate water content in organic solvents . XRD , SEM and HRTEM results demonstrate that the obtained PEI-NaBiF 4 :Yb 3+ /Er 3+ UCNPs are pure hexagonal phase with uniform size. The successful modification of PEI on the UCNPs surface was evidenced by ζ-potential test, XPS and TG analysis . These synthesized UCNPs are disintegrated into smaller nanoparticles in the presence of water and thus result in a surface quenching effect, which show the features of 0–100% wide range water response in various organic solvents. The sensing performance towards real samples was validated by the water content determination in beer, rum and white spirit. Furthermore, the luminescence intensity variation of the PEI-modified NaBiF 4 :Yb 3+ /Er 3+ enable the test visualization and ease of portability.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Chunyan Zhang,Zhendong Fu,Feng Hong,Jingzhi Dou,Tengri Dong,Yunxiao Zhang,Dan Li,Guixia Liu,Xiangting Dong,Jinxian Wang
NIR light accounts for 50% of total solar energy, but only a small amount of the energy is applied to photocatalytic reactions. The incorporation of upconversion nanoparticles with semiconductor materials is an effective tactics to exploit NIR-driven photocatalyst . In this work, we report a composite material that can convert NIR light into UV–Vis photons. The light conversion material is composed of NaBiF 4 : Yb 3+ , Tm 3+ up-conversion nanocrystals . The petal-like Bi 2 WO 6 is used as a semiconductor photocatalyst to directly degrade model pollutants, such as RhB. By controlling the morphology of Bi 2 WO 6 , the contact area between the semiconductor photocatalyst and the pollutant molecules is increased. The preparation of “double bismuth” composite material NaBiF 4 :Yb 3+ , Tm 3+ /Bi 2 WO 6 provides the possibility to make full use of sunlight. Under the excitation of simulated sunlight, the photocatalyst of NaBiF 4 :Yb 3+ , Tm 3+ /Bi 2 WO 6 reaches the highest degradation efficiency of 98% in 27 min. Compared with Bi 2 WO 6 , the prepared composite photocatalyst shows better photocatalytic performance, which is attributed to the effective energy transfer between NaBiF 4 :Yb 3+ ,Tm 3+ and Bi 2 WO 6 . The capture tests were used to detect active species used in the degradation process. After four continuous photocatalytic cycles, about 95% of RhB solution is degraded. Under the simulated solar light illumination, the photocatalytic mechanism of the composite photocatalyst is discussed. The results propose a promising system to improve the photocatalytic activity through the efficient use of sunlight.
研究领域:
材料科学
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环境科学
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光催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
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