JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2014
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IF 2.291
Xingyuan Guo,Changfeng Chen,Shengyan Yin,Weiye Song,Feng Shi,Weiping Qin.
In this work, the effects of NaYF 4 :Yb 3+ , Tm 3+ (NYT) structure on the near-infrared light (NIR) photocatalysis performance of ZnO were investigated. α-NYT/ZnO nanocomposites (NCs) and β-NYT/ZnO NCs were fabricated by a high temperature decomposition reaction method. The prepared NCs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–vis spectroscopy, Raman spectroscopy, and photoluminescence spectra (PL). The NIR photocatalytic activities of the synthesized α- and β-NYT/ZnO NCs were studied by the degradation of Rhodamine B. The differential photocatalytic activities between of α- and β-NYT/ZnO NCs are believed to be correlated to the effects of α- and β-NYT on the oxygen vacancies and exposed crystal face of ZnO.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Tingxia Wu,Ying Hong,Lingyu Song,Yongbao Zhu,Jinling Wang,Yuanyuan Zhu,Jing Fang,Guosong Chen
Smuggling has caused serious adverse effects on the global market and national security, among which drug smuggling is increasingly rampant. Thus, the development of high-tech security strategies has become an urgent challenge for customs supervision. Recently, lanthanide ions (Ln 3+ ) doped upconversion nanoparticles (UCNPs) have opened up new ways for security and anti-fake applications due to their unique optical properties under near-infrared excitation. Here, we propose a novel upconversion microcrystal composed of hexagonal phase NaYF 4 :Ln 3+ capped by sodium hexametaphosphate (SHMP), successfully used in customs supervision. The addition of SHMP can not only regulate the morphology of microcrystals, but also significantly improve the luminescence properties of UC. The absolute quantum yield is up to 7% at the low power density of 30 W∙cm −2 , above most currently reported levels. Without adding any organic additives, the precise control of particle phase and morphology (e.g., microrod, hexagonal prism and hollow sphere) would be achieved by adjusting the doping ratio of SHMP/Ln 3+ . As the reaction time extends, the morphology of NaYF 4 :Ln 3+ changes from ellipsoid to microrod, while cubic phase transforms into hexagonal phase. Under the excitation of 980 nm laser, the green upconversion emission of hexagonal NaYF 4 :Ln 3+ microrods is significantly strengthened, which is more powerful than other observed particles with other shapes. This strong upconversion emission that depends on morphology and phase has huge application potential in security anti-counterfeiting and photonic devices .
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2020
·
IF 2.726
Hao Tang,Ying Xu,Xianhua Cheng
In this study, Cr 3+ and Mg 2+ co-doped β-NaYF 4 :Yb 3+ /Er 3+ (NYFYE) microcrystals were synthesized for the first time by the facile hydrothermal method . Cr 3+ and Mg 2+ co-doping was confirmed to influence the structure, morphology and UCL property of NYFYE microcrystals. The growth mechanism of NYFYE microcrystals doped with different Cr 3+ and Mg 2+ was discussed in detail. With 16 mol% Cr 3+ and 4 mol% Mg 2+ co-doping into NYFYE, the UC emissions were enhanced to 7 times (green) and 4 times (red) higher than those of the undoped counterpart, and the mechanism was explored by considering the different roles of Cr 3+ and Mg 2+ , the surface quenching and concentration quenching effects. This finding suggests the co-doping of two different impurity ions may be a better approach than corresponding single impurity ion doping for morphology control and UCL intensity enhancement, which is instructive for high performance UC crystals design.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Qiyao Guo,Jihuai Wu,Yuqian Yang,Xuping Liu,Jinbiao Jia,Jia Dong,Zhang Lan,Jianming Lin,Miaoliang Huang,Yuelin Wei,Yunfang Huang
The introduction of upconversion materials as spectral converter into photovoltaic devices to harvest and convert near infrared photons to visible photons that can thus be absorbed by perovskite layer is a promising strategy for enhancing the performance of perovskite solar cells . Hence, β-NaYF 4 :Yb 3+ /Er 3+ /Sc 3+ @NaYF 4 rare-earth doped upconversion nanoparticles with core-shell structure are synthesized. The doped rare-earth ions Yb 3+ and Er 3+ convert near infrared light to red and green light, and the Sc 3+ ions enhance the upconversion luminescence efficiency, which broaden the absorption range of solar irradiation and generate extra photocurrent in the solar cells. The surface defects of β-NaYF 4 :Yb 3+ /Er 3+ /Sc 3+ is passivated by the even NaYF 4 shell, which results in the obvious enhancement in upconversion emission intensity. Consequently, the perovskite solar cell based on the rare-earth doped upconversion nanoparticle mesoporous layer achieves a high power conversion efficiency of 20.19%, while the device based on TiO 2 mesoporous layer gets an efficiency of 17.44%.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jinyuan Zhang,Tong Liu,Tian Shi,Zhiyuan Cheng,Fuhua Gao,Da Cai,Shenghong Yang,Yueli zhang
Constructing comprehensive performance-enhanced heterostructured composite using the synergistic effect of complementary advantages between heterogeneous materials has always been challenging. In this work, highly stable β-NaYF 4 :Yb 3+ , Tm 3+ @BiOCl (NYF@BiOCl) heterostructured upconversion composites were successfully prepared using a two-step hydrothermal method. Compared to NYF/BiOCl mechanical mixtures, NYF@BiOCl with intimate interface show a higher photocatalytic degradation rate of rhodamine B (RhB) aqueous solutions, achieving 99.9% in 18 min and 98% in 2 h under simulated sunlight and near-infrared (NIR) light, respectively. The construction of heterostructures has a broad-spectrum response, which improves the utilization of sunlight and achieves efficient photocatalytic degradation of organic contaminants. Upconversion luminescence mechanism, spectral overlap, and Förster resonance energy transfer (FRET) explain the high photocatalytic activity of NYF@BiOCl. Meanwhile, NYF@BiOCl exhibits good universality to efficiently degrade other organic contaminants (methyl orange (MO), methylene blue (MB), bisphenol A (BPA), p-chlorophenol (4-CP)). This study demonstrates the potential of synergistic effects between heterogeneous materials. It Enhanced the photocatalytic activity of the NYF@BiOCl heterostructured composites driven by NIR light, providing a new strategy for energy-efficient and degradation of hazardous organic contaminants to alleviate environmental pollution.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 16
·7385-7394
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IF 3.925
Xia Xu,Meirong Fu,Min Yang,Bing Hu,Jitao Yang,Wenjun Gui,Jinxiu Guo
4-Nitrophenol (4-NP) is one of the main toxic water pollution substances. Most 4-NP fluorescence detection methods are based on the change in the fluorescence intensity of a single emission peak, which has low sensitivity, accuracy, and narrow analytical ranges. Herein, NaYF4:Yb3+(58%),Tm3+@NaYF4@Au were designed and synthesized for the quantitative detection of 4-NP due to the fluorescence intensity ratio of two upconversion emission peaks, the analytical range is 0.01–100 μg mL−1 and the detection limit is 0.01 μg mL−1. In addition, 1.66 nm Au nanoparticles randomly distributed on the surface of composite nanomaterials can effectively cause the catalytic reduction of 4-NP. Therefore, NaYF4:Yb3+(58%),Tm3+@NaYF4@Au is a type of composite nanomaterial with great development potential and application prospects in the detection and catalysis of 4-NP.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 10
·6369-6385
·
IF 1.674
Chen Zhangxu,Fu Ming-Lai,Huang Xiao-Dan,Yuan Baoling,Yang Jia-Cheng E.
To enhance photocatalytic activity spectra area of the TiO 2 based photocatalyst, and to separate and recycle photocatalyst easily, magnetic photocatalyst was prepared with β-NaYF 4 :Yb 3+ ,Tm 3+ , TiO 2 , Fe 3 O 4 as carriers, and tetraethyl orthosilicate as precursor. The magnetic infrared responsive photocatalysts were thoroughly characterized by field emission scanning electron microscopy, X-ray diffraction, a fluorescence spectrometer and UV–Vis–NIR diffuse reflectance spectroscopy. They showed that the composite of β-NaYF 4 :Yb 3+ ,Tm 3+ /TiO 2 /Fe 3 O 4 @SiO 2 (UCTFS) emits visible luminescence upon 980 nm excitation, and energy transfer from β-NaYF 4 :Yb 3+ ,Tm 3+ to TiO 2 was verified. The photocatalytic activities of the UCTFS were studied by orthogonal experiments for photodegradating methylene blue (MB). The degradation rate of MB can reach 86.69% under the optimal conditions. After the four recycles, the degradation rate remained 52.72%. It also showed that 50.27% of the degradation efficiency of phenol can be obtained under the same experimental parameters. These results suggest that magnetic UCTFS composite is stable and a magnetic NIR-driven photocatalyst for degradation of organic pollutants. Moreover, the NIR driven photocatalytic mechanism of this reported composite was proposed. The strategy suggested here may be indicated for the effective fabrication of magnetic NIR-driven photocatalyst for application in the water purification by full spectra of solar energy.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 12
·8258-8268
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IF 1.354
Tong Chao,Xie Shaowen,Zhou Hu,Li Na,Gong Liang,Jian Jian,Zhang Changfan,Xu Lijian,Xu Jianxiong
In this study, well-defined PAA-coated NaYF4:Yb3+, Er3+ nanophosphors were synthesized via a poly(acrylic acid) (PAA) mediated hydrothermal process. The rational control of initial reaction conditions, such as hydrothermal temperature, pH value of precursor-solution,
added amount of PAA, and molecular weight of PAA ligand, resulted in upconversion of NaYF4:Yb3+, Er3+ phosphors with varying crystal phases (α and β) and morphologies (e.g., nanosphere, submicrorod, microrod, microtube, and microprism).
By assessing the upconversion luminescent properties of the synthesized NaYF4:Yb3+, Er3+ phosphors upon excitation by 980 nm infrared light, it was demonstrated that the β-phase NaYF4:Yb3+, Er3+ phosphors generally
presented stronger upconversion luminescent than α-phase NaYF4:Yb3+, Er3+ phosphors and orthorhombic phase of YF3:Yb3+, Er3+ sample. Additionally, the β-phase NaYF4:Yb3+, Er3+
phosphors with hollow microtube morphology presented higher upconversion luminescent intensity than phosphors of other morphologies. This may be due to microtubes having larger surface area (inner and outer surfaces), which promoted the absorption efficiency under similar excitation conditions,
therefore generating higher luminescent intensity. Findings form this study suggest for precisely controlled growth of other complex rare earth fluoride compounds and provide a reference for exploration of component-, phase- and morphology-dependent upconversion luminescence properties.
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Song Ye,Ping Xiao,Huazhen Liao,Song Li,Deping Wang
We developed a facile approach for the fast synthesis of ultrasmall and monodisperse β-NaYF 4 :Yb 3+ , Er 3+ nanocrystals down to 5.3 nm with the assistant of oleate ligands, based on which the highly bright sub-10 nm β-NaYF 4 :Yb 3+ , Er 3+ @NaYF 4 core-shell nanocrystals with three order of magnitude increased upconversion emission were successfully obtained by a seed-mediated growth method. The reaction time and temperature dependent experimental results implied that the introduciton of extra oleate ligands can both promote the α-to-β phase transition and impeded the crystal growth of NaYF 4 , which is due to the oleate ligand induced orderly arrangement of Y 3+ and capping effect, respectively. It is expected that the oleate ligands mediated phase transition and size evaluation, demonstrated here in NaYF 4 :Yb 3+ , Er 3+ NCs, is also applicable to other lanthanide-doped upconversion nanocrystals.
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高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Dongfang Han,Li Niu,Yuangong Ma,Youlin Huang,Wen-Sheng Zhang
To utilize near-infrared (NIR) light within the solar energy spectrum, we have engineered an advanced composite of NaYF4:Yb3+,Tm3+@g-C3N4@WO3@MXene (denoted as NYT@g-C3N4@WO3@MXene) capable of absorbing NIR light to facilitate photocatalytic reactions. This environmentally benign system integrates semiconductor heterostructures (g-C3N4 and WO3) with upconversion nanoparticles (NaYF4:Yb3+,Tm3+, abbreviated as NYT) and Ti3C2 MXene nanosheets. Experimental validation demonstrated exceptional performance in antibiotic remediation, with the composite achieving 86.3% tetracycline decomposition over 12 hours under NIR irradiation through synergistic mechanisms, while also exhibiting good cycling stability. The enhanced photocatalytic activity arises from collaborative effects between upconversion luminescence, optimized charge transfer pathways within the heterojunction architecture, and the visible light absorption characteristics of MXene.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Hao Tang,Hua Zhou,Xianhua Cheng
The green and red upconversion (UC) emissions of 35 mol% Ca 2+ doped β-NaYF 4 :Yb 3+ /Er 3+ microcrystals were improved to 102.8 and 43.1 times higher than those of Ca 2+ -free counterparts. X-ray powder diffraction spectra, scanning electron microscopy, Fourier transform infrared spectroscopy , upconversion luminescence (UCL) spectroscopy and Judd-Ofelt analysis were performed to investigate the mechanism of UCL intensity enhancement caused by Ca 2+ doping. The hexagonal-to-cubic phase transition was observed when Ca 2+ doping concentration exceeded 35 mol%. The incorporation of Ca 2+ into hexagonal microcrystals lattice induced unit cell volume enhancement and microcrystals surface to volume ratio variation, which affected the UCL intensity by hindering the non-radiative energy loss process via Yb 3+ /Er 3+ ions and changing the amount of surface quenchers adsorbed on the microcrystals surface. The hypersensitive transition related local crystal field asymmetry around Er 3+ in the grown hexagonal microcrystals was also investigated by Judd-Ofelt analysis but unexpectedly found to be the less dominant factor for the UCL intensity variation. This study helps to realize the mechanism of impurity ion doping resulted UCL intensity enhancement, which is instructive for high-performance UC microcrystals synthesis.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2514-2523
·
IF 2.2
Zhou Wei,Yang Jian,Jin Xiangliang
Upconversion (UC) nanomaterials are of interest to researchers because of their excellent photostability, effective quantum efficiency and optical temperature dependence. However, most UC nanomaterials are thermally quenched, which causes optical nanothermometers to be susceptible to their own thermal effects, reducing the accuracy of temperature measurements. In this paper, NaYF 4 :Yb 3+ /Ho 3+ /Tm 3+ /Gd 3+ nanorods with UC luminescence and resistance to thermal quenching are prepared through a simple hydrothermal method. The UC luminescence intensity of NaYF 4 :Yb 3+ /Ho 3+ /Tm 3+ /Gd 3+ nanorods is adjusted by doping with Tm 3+ ions. The luminescence intensity at each location shows different temperature dependence as the temperature increases. When the temperature reaches 573 K, the integrated luminescence intensity is three times that at 293 K. At the same time, the intensity at all temperature points in the range of 293–573 K is greater than the intensity at 293 K, which shows that the nanorods have excellent resistance to thermal quenching. In addition, the relative sensitivity ( S r ) of LIR( I 696 / I 476 ), LIR( I 696 / I 541 ), LIR( I 696 /I 646 ), LIR( I 696 / I 802 ), and LIR( I 541 / I 476 ) is investigated based on the luminescence intensity ratio (LIR) technique. The S r of LIR( I 696 / I 802 ) is found to have larger values in the low-temperature range, while S r of LIR( I 696 / I 476 ) has larger values in the high-temperature range. The use of LIR( I 696 / I 802 ) and LIR( I 696 / I 476 ) in separate temperature bands allows S r to reach 0.93–1.67 %K −1 in the range of 293–573 K, confirming that the nanorods have high S r over a wide temperature interval. This study indicates that the NaYF 4 :Yb 3+ /Ho 3+ /Tm 3+ /Gd 3+ nanorods are promising candidates for optical thermometers with high sensitivity, wide temperature range, and resistance to thermal quenching.
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高影响因子
危险品化学品经营许可证（带存储）