CRYSTENGCOMM
·
2018
·Vol. 20
·期 14
·1945-1953
·
IF 3.304
Kaimin Du,Xia Xu,Shuang Yao,Pengpeng Lei,Lile Dong,Manli Zhang,Jing Feng,Hongjie Zhang
Hexagonal phase (β-) NaYF4:Yb/Er upconversion (UC) microrods doped with Cu2+ ions were prepared via a facile solvothermal method. Simultaneous phase and shape control of NaYF4:Yb/Er crystals with enhanced upconversion luminescence (UCL) was successfully realized by codoping with Cu2+ ions. With an increasing Cu2+ ion concentration in the NaYF4:Yb/Er system, the crystal structure changed from a mixture of α- and β-phases to the pure β-phase and was converted into highly uniform microrods. As for the Cu2+ ion doped β-NaYF4:Yb/Er upconversion microrods, the maximum emission occurs with the sample added with 60 mol% Cu2+ ions and the UCL intensities of the green and red emissions were enhanced 37 and 25 times, respectively. Meanwhile, the possible mechanisms for the enhanced UCL of NaYF4:Yb/Er crystals were also discussed in detail. Moreover, the temperature dependent UCL properties of 60 mol% Cu2+ ion doped β-NaYF4:Yb/Er were studied under 980 nm excitation, which were temperature-sensitive over a wide temperature range from 123 K to 423 K. The change in UCL intensity influenced by temperature was discussed in detail.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
稀土化学
·
生物医学成像
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 38
·10226-10232
·
IF 5.976
M. Yuan,R. Wang,C. Zhang,Z. Yang,W. Cui,X. Yang,N. Xiao,H. Wang,X. Xu
Exploiting new transitions in the visible light range is important in the development of advanced color displays, superior laser materials, and novel optical devices. Here, for the first time, we observed several intensive upconversion (UC) emission bands at 382, 472, 506, 560, and 618 nm from a single β-NaYF4:Yb/Er microcrystal via saturated excitation. Compared to the traditional red (650 nm) and green (545 nm) UC emissions, these new emission bands intensify rapidly as the excitation intensity increases, which leads to full-color UC luminescence in the visible region. Nearly white luminescence was elicited from a single microcrystal with a relatively high excitation power. Moreover, the mechanism of these newly observed UC emissions was elucidated by examining the energy migration. It was also found that these microcrystals exhibit waveguide-transmission characteristics and are transparent to their own UC emissions. These findings provide a basis for further exploration of the silent transitions of other rare-earth-ions and demonstrate the potential for using β-NaYF4:Yb/Er microcrystals in a variety of applications in color display and waveguide-based optical devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2013
·
IF 0.769
Yu-Rong TANG,Yu ZHANG,Rui LIU,Ying-Ying SU,Yi LÜ
The poly(acrylic acid) functionalized NaYF 4 :Yb,Er nanoparticles (NPs) were found to possess intrinsic peroxidase-like activity, which could catalyze oxidization of 3,3′,5,5′-tetramethylbiphenyl (TMB) by H 2 O 2 to produce a color variation. Using TMB as substrate, we systematically studied the effect of a series of conditions, such as temperature and pH, on the catalytic activity of NaYF 4 :Yb,Er NPs. When combined with uricase, the proposed colorimetric method could be successfully used for the determination of uric acid. Under the optimum conditions, the linear range of this method was from 1.0 × 10 −5 M to 2.0 × 10 −4 M with the detection limit down to 5.3 × 10 −6 M. Moreover, the developed method was applied to detect uric acid in serum samples and the results were in good agreement with those reported by the hospital.
研究领域:
生物化学
·
医学诊断
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Yuanming Gao,Yu Bai,Peng Zhang,Weicheng Liang,Qi Liu,Shufang Yan,Jiao Huang,Hongying Dong,Ruigang Wang,Wen Ma
A double rare-earth (Yb/Y) co-doped SrZrO 3 [Sr 1.0 (Zr 0.9 Yb 0.05 Y 0.05 )O 2.95 ] thermal barrier coating was prepared via suspension plasma spraying (SPS). The rare-earth nitrates [Zr(NO 3 ) 4 ·5H 2 O, Sr(NO 3 ) 2 , Yb(NO 3 ) 3 ·6H 2 O, Y(NO 3 ) 3 ·6H 2 O] and NH 4 (C 2 O 4 ) 2 ·H 2 O were used to prepare the precursor suspension by co-precipitation. The thermal decomposition and crystallization of the precursor suspension powders calcined at 1200 °C were characterized with X-ray diffraction and a synchronous thermal analyzer coupled with quadrupole mass spectrometry . Zr 2 (C 2 O 4 ) 2 (OH) 4 decomposed into Zr(C 2 O 4 ) 2 , ZrO 2, and H 2 O initially, followed by the decomposition of Zr(CO 3 ) 2 into ZrO 2 . The SrC 2 O 4 precursor decomposed into SrCO 3 and SrO consecutively. The ZrO 2 reacted with SrO (Yb 2 O 3 , Y 2 O 3 ) to generate the Yb/Y co-doped SrZrO 3 . And the Yb/Y co-doped SrZrO 3 coating with a columnar crystal structure was prepared by SPS, which was analyzed with scanning electron microscopy, an inductively coupled plasma atomic emission spectrometer, and a laser flash analyzer. The thermal conductivity of the as-prepared coating was 1.77 W·m −1 ·K −1 at 1000 °C, which was more than 19% lower than that of the SPS SrZrO 3 coating.
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 33
·期 31
·23880-23887
·
IF 2.478
Ding Yanli,Zhang Xiaodan,Zhao Ying
The use of upconversion (UC) materials is an effective strategy for harvesting the near-infrared (NIR) solar photons in perovskite solar cells. Hexagonal β-NaLuF 4 :Yb,Er submicron prisms were synthesized by a facile solvothermal method. Gd 3+ doping is used to enhance the UC emission intensity. We investigated how the concentration of Gd 3+ ions affected the morphological evolution, microstructure, and luminescence performance of NaLuF 4 :Yb,Er and explored the mechanism for improving luminescence at 980 nm excitation. By incorporating the optimized NaLuF 4 :Yb,Er,Gd into the perovskite solar cells’ (PSCs) hole transport layer, the short-circuit density ( J sc ) of UC-PSCs can be enhanced from 19.31 to 21.77 mA cm −2 .
研究领域:
材料科学
·
光学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 3
·1866-1872
·
IF 1.134
Li Na,Tan Haihu,Xie Shaowen,Liu Simin,Tong Chao,Ouyang Min,Xu Lijian
Upconversion nanocrystals with uniform size and hydrophilic surface have potential applications in biological medical engineering. In this study, hydrophilic NaYF4:Yb, Er nanospheres were synthesized via hexadecylpyridinium chloride (CPC) mediated hydrothermal process. The
synthesized NaYF4:Yb, Er upconversion nanospheres (UCNSs) were characterized by various characterization methods. Results showed that the synthesized UCNSs exhibited a uniform sphere-like structure with average diameter of ~250 nm. The surface of UCNSs was captured by CPC molecule
indicating hydrophilic properties of UCNSs. The spherical UCNSs composed of mixed phase (α+β) NaYF4 nanocrystals. This is the novel study for synthesis of NaYF4:Ln3+ crystal employing CPC as ligand. Moreover, the effect of CPC concentration on
synthesis of UCNSs was investigated by comparatively studying morphology, crystal phase and luminescent properties of desired sample prepared under different experimental conditions. It was found that high concentrations of CPC ligands were more favorable for forming NaYF4 crystal
nanospheres with morphology that is more regular, have smoother surface, with higher crystallinity and better upconversion fluorescent properties. The possible growing mechanism was proposed and growing of NaYF4:Yb, Er nanospheres followed the classical Ostwald ripening process.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 50
·期 6
·2480-2490
·
IF 2.305
Wei T.,Ye L.,Zhao C. Z.,Wang W. B.,Ma Q. Z.,Lv Q.,Liu J. M.
Filled tetragonal tungsten bronze (FTTB) oxides represent a huge family of materials which exhibit rich electric and magnetic functionalities deserving for comprehensive investigations. Recently, some members of this family have established their significance in efficient upconversion (UC) luminescence upon proper rare-earth species doping, while the signal intensity is yet weak. In this work, the UC luminescence of Ba
p
Ln 6− p
Ti 8− p
Nb 2+ p
O 30 codoped by Ho and Yb (BLTN p :Ho–Yb) with different p are studied. The bright UC green emission, red emission, and near-infrared (NIR) emissions, originating from the two-photon energy-transfer process associated with the 5 S 2 → 5 I 8 , 5 F 5 → 5 I 8 , and 5 S 2 → 5 I 7 transitions of Ho 3+ ions, were observed. The luminescence intensity demonstrates remarkable dependence on the A- and B-sites occupation, and the UC green, red, and NIR luminescence can be enhanced for 10, 25, and 10 times, respectively, upon a change of p from 3.5 to 5.0. This dependence is found to be tightly correlated with the crystal field environment, as characterized by the local lattice distortion. This work sheds light onto an alternative strategy to enhance the UC luminescence in this FTTB family.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2014
·Vol. 16
·期 37
·20009-20012
·
IF 4.198
Bin Dong,Rui N. Hua,Bao S. Cao,Zhi P. Li,Yang Y. He,Zhen Y. Zhang,Otto S. Wolfbeis
The size-dependent temperature sensitivity is observed on the upconversion luminescence of NaYF4:Er,Yb microspheres with sizes between 0.7 and 2 μm that are prepared by a poly(acrylic acid)-assisted hydrothermal process. It is found that the fluorescence intensity ratio (FIR) of their green upconversion emissions (with peaks at 521 and 539 nm) is strongly size-dependent at temperatures between 223 and 403 K. As the size of the spheres increases from 0.7 to 1.6 μm, the maximum sensitivity decreases from 36.8 × 10−4 to 24.7 × 10−4 K−1. This effect is mainly attributed to the larger specific surface area of the smaller spheres where a relatively large number of Er(III) ions are located at the surface. This results in an increase in the efficiency of the 4S3/2 → 2H11/2 population process of the Er(III) ions due to stronger electron–phonon interactions with increasing T. Heating of the spheres by NIR light is also supposed to cause enhanced electron–phonon interactions in such particles.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Haoran Zhang,Tianxi Feng,Song Ye,Deping Wang
In this research, the modified upconversion nanocrystals NaYF 4 :Yb,Er were adopted as the precursors for the synthesis of the NaYF 4 :Yb,Er@UiO-66 composite. The XRD, XPS and TEM characterizations indicated that the composite has good crystallinity and uniform morphology. Under 980 nm excitation, the NaYF 4 :Yb,Er@UiO-66 composite exhibits bright upconversion emission that characterized of Er 3+ : 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 , and 4 F 9/2 → 4 I 15/2 radiative transitions. After modified with BPEI (branched polyethyleneimine), the NaYF 4 :Yb,Er@UiO-66/BPEI fluorescence probe was constructed and was used for the detection of Cu 2+ . The results revealed that the integrated emission intensity of Er 3+ displayed a linear relationship with the concentration of Cu 2+ within the range of 5 to 45 μM with a LOD of 0.9615 μM. This study offered a feasible method for constructing UCNC@UiO-66 composites with regular morphology,which may have a potential application as fluorescent probes for the detection of various metal ions by adjusting the doping luminescent center.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LUMINESCENCE
·
2024
·Vol. 39
·期 3
·e4720
·
IF 3.2
Ximan Zhang,Yun Zhang,Lina Zhao
Developing effective means for detecting contamination in milk during production, processing, and storage is both important and challenging. Tetracycline (TC), due to its use in treating animal infections, is among the most prevalent organic pollutants in milk, posing potential and significant threats to human health. However, efficient and in situ monitoring of TC remains lacking. Nevertheless, we have successfully developed a highly sensitive and selective fluorescence method for detecting TC in milk using a metal–organic framework material made from Yb-TCPP (ytterbium-tetra(4-carboxyphenyl)porphyrin). The calculated Stern–Volmer constant ( K SV ) was 12,310.88 M −1 , and the detection limit was 2.44 × 10 −6 M, surpassing previous reports. Crucially, Yb-TCPP fluoresces in the near-infrared region, promising its development into a specific fluorescence detection product for practical TC detection in milk, offering potential application value.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 115
·94980-94985
·
IF 3.84
Chuanying Wang,Xianhua Cheng
In this work, amino-functionalized NaYF4:Yb,Er upconversion nanoparticles (UCNPs) were synthesized by a hydrothermal method. Then a simple self-assembly method was carried out to prepare a NaYF4:Yb,Er upconversion (UC) film on a silicon (Si) substrate, using γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) as an intermediate coupling agent. The chemical composition and surface morphology of the UC film were characterized using X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), water contact angle (WCA), and scanning electron microscopy (SEM) measurements. Furthermore, the tribological properties of the UC film were investigated by a UMT tester. The results indicate that the UC film has been successfully prepared on the Si substrate by the formation of chemical bonds and its lifetime is about five times longer than that of the NaYF4:Yb,Er UCNPs on a bare Si substrate. This work provides a facile way to synthesize a NaYF4:Yb,Er UC film with robust adhesion to the substrate, which can be applicable for other UC films.
研究领域:
材料科学
·
表面工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 38
·6626-6633
·
IF 0
Min Liu,Yuhang Ye,Cheng Yao,Wenbo Zhao,Xiaohua Huang
Chemiluminescence was used as an excitation light source to construct a universal photoelectrochemical platform based on Mn2+-doped NaYF4:Yb/Er upconversion nanoparticles, which greatly improves the electrochemiluminescence intensity and offers more stable cathodic signals compared to pure NaYF4:Yb/Er NPs. Here, we report for the first time the ECL behaviors of Mn2+-doped NaYF4:Yb/Er NPs, which were synthesized via a facile strategy. Mn2+ doping resulted in a 4-fold ECL intensity enhancement of NaYF4:Yb/Er. The characteristics of Mn2+-doped NaYF4:Yb/Er nanocomposites were obtained using transmission electron microscopy (TEM), energy dispersive X-ray spectrometer (EDS), and fluorescence spectra. After all the results had indicated that NaYF4:Yb/Er upconversion nanoparticles were successfully doped with Mn2+, the electrochemiluminescence platform was built. The as-prepared NaYF4:Yb/Er NPs were rendered water-soluble and then employed as ECL emitters for carcinoembryonic antigen (CEA) determination. The results indicated that the modified electrode can be used to determine CEA without interference from non-specific proteins, with a low detection limit of 5.2 pg mL−1. The biosensor can also be used for quantification of the CEA concentration in real samples.
研究领域:
生物医学工程
·
纳米医学
✓ 已验证
DOI
PubMed
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