JOURNAL OF RARE EARTHS
·
2018
·
IF 2.524
Tao Pang,Wenbo Peng,Ming Yang,Jianping Xie,Wenhui Lu
An optical heater based on hexagonal NaGdF 4 :Yb 3+ /Er 3+ is reported. XRD , SEM and EDS characterization results show that F − /Ln 3+ can not only control the phase composition , particle size and morphology, but also affect the effective doping concentration of Yb 3+ and Er 3+ . When F − /Ln 3+ is 12/1, the strongest upconversion luminescence is obtained. Based on the luminescent temperature sensing behavior of Er 3+ , the photo-thermal conversion performance was investigated. The results indicate that the temperature of irradiation spot is linearly dependent on the power density, and the photo-thermal responsivity is determined to be 3.3 K·cm 2 /W. Also, it is found that the photo-thermal conversion efficiency can be regulated by changing the Yb 3+ doping concentration. Compared with the nano-gold, copper sulfide and carbon nanotubes , the NaGdF 4 :Yb 3+ /Er 3+ has the triple functions of upconversion luminescence, temperature sensing, and photo-thermal conversion, and may therefore be a promising optical heater for photo-thermal therapy of tumors.
研究领域:
材料科学
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纳米技术
·
光学
·
生物医学工程
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 10
·4214
·
IF 4.6
Tianyun Du,Xiaojie Xue,Xiuxun Han
Rare earth silicate phosphors of high quantum efficiency with a stable performance are promising materials in the fields of display and illumination. The grain sizes of products synthesized via the conventional solid-state reaction method are usually too large to satisfy the requirements of color cast and extraction efficiency in high-resolution light-emitting devices (LEDs). We designed a synthetic route and successfully fabricated rare earth silicate NaGd9Si6O26(NGSO) sub-microcrystals with a size ranging from 550 to 1200 nm. The reaction mechanism and optical properties were systematically investigated. The quantum efficiency of Eu3+-activated NGSO sub-microcrystals was about 36.6%. The LED encapsulated with these sub-microcrystals showed lower color deviation and higher lumen efficiency and lumen flux compared to that with NGSO fabricated using the conventional solid state reaction method.
研究领域:
材料科学
·
光电技术
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 13
·5109-5115
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IF 8.067
Tao Pang,Yanyan Wu,Yujian Zhang,Ronghua Jian,Junwen Mao,Hong Wang,Hai Guo
Although much effort has been focused on thermally enhanced upconversion (UC) luminescence, it remains a challenge to maintain or even enhance the UC luminescence of NaLnF4-based phosphors (Ln = Y, Gd, Lu) using a surface-independent strategy. In this work, we demonstrate that the effect of temperature on UC luminescence in NaGdF4:Nd3+/Yb3+/Er3+ nanocrystals is strongly dependent on the exciting wavelength. When excited using 808 nm radiation, the UC luminescence exhibits good resistance to thermal quenching. The reason is that, in this situation, the negative effect of multi-phonon decay can be fully compensated by the thermal enhancement in the transition cross-section and in energy-transfer rate. Our research reports a novel strategy for the anti-thermal quenching of upconversion luminescence, which is potentially applicable in the design of dynamic UC anti-counterfeiting as well as in NIR-I-responsive thermometers and nanoheating.
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 WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2022
·Vol. 37
·期 3
·393-398
·
IF 1.271
Hou Huayu,Gan Lin,Wang Youfa,Wang Wei
Nd 3+ -doped NaGdF 4 : Yb, Tm nanocrystals were synthesized by an improved high-temperature thermal decomposition method, and the effects of doping concentrations on the crystal structure, phase composition, and upconverted fluorescence intensity were also investigated. The results reveal that the introduction of Nd 3+ ions does not cause the transformation of the crystal phase, but induce the change of the unit cell parameters. Meanwhile, the fluorescence intensity of the synthesized nanocrystals when co-doped with 3 mol% Nd 3+ is the strongest under the excitation of 980 nm laser, which is 3.9 times that of the Nd 3+ -free doped nanoparticles, and the average size is 62.9 nm. And it is located in the blue area of the CIE coordinate diagram, and the corresponding color purity is 91.81% under the same experimental conditions. The resulting nanocrystals show the potential as excellent fluorescence labeling and in vivo imaging probes.
研究领域:
材料科学
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纳米技术
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 19
·5210-5217
·
IF 5.976
Shaohua Fan,Guojun Gao,Zhiquan Lin,Weichang Li,Sijun Fan,Shiyu Sun,Hongtao Sun,Lili Hu
High purity green up-conversion (UC) materials have wide applications in fluorescent labeling, plastic recycling and displays, etc. However, Yb3+/Er3+-based UC materials exhibit poor color purity of green light, and their output color is normally unstable under a variable excitation power density, which hinders their application in the aforementioned areas. Herein, we report the highly stable and efficient pure green UC of rod-like β-NaGdF4:Yb3+,Ho3+ submicro-crystals synthesized via a newly developed ion-exchange modified (IEM) method. IEM-derived NaGdF4:Yb3+,Ho3+ monodisperse submicro-crystals present not only a high-purity green output color (due to the large intensity ratio of green to red, IGreen/IRed ≈ 5) but also excellent color stability under varying conditions, such as excitation power density and doping concentration of Yb3+/Ho3+. More importantly, IEM arouses an enormously enhanced UC emission intensity of ∼3700-fold that of the precursor crystals (PC). The UC emission intensity of IEM β-NaGdF4:Yb3+,Ho3+ is ∼4 times stronger than that of its high temperature annealing (HTA) counterpart. The emission intensity of the single green band is ∼40% stronger than that of the IEM β-NaGdF4:20%Yb3+,2%Er3+ submicro-crystals. A proof-of-concept fluorescent labeling of clover patterns (15 × 12 mm) printed from NaGdF4:Yb3+,Ho3+ ink with stable and high purity green fluorescence is demonstrated under excitation with various power densities.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Guangdong Wu,Juanqin Xue,Dashi Lei,Yanyan Zhou,Zhaoyuan Cao,Kang Ren,Qiang Bi,Zhihua Leng
Currently, upconversion nanoparticles (UCNPs) based photocatalysts have been extensively developed to improve solar energy utilization. However, the mechanisms underlying interfacial energy migration of upconversion photocatalyst remain unclear. Herein, a promising composite photocatalyst with complementary properties is designed by integrating β -NaGdF 4 :Yb 3+ /Er 3+ (NGFYE), CdS and multi-walled carbon nanotubes (MWCNTs). The morphology, structure and chemical properties of NGFYE@CdS/MWCNTs ternary photocatalyst are characterized. In addition, the existence of Förster resonance energy transfer process in NGFYE@CdS/MWCNTs photocatalysts, i.e., the migration of excitation energy from Er 3+ − 4 S 3/2 excitation level and higher excitation level (e.g., Er 3+ − 2 H 11/2 ) to CdS nanoparticles, was further confirmed by density functional theory (DFT) calculations. The optimized NGFYE@CdS/MWCNTs photocatalyst presents 71.65 % and 35.29 % degradation of tetracycline hydrochloride (TCH) and ciprofloxacin (CIP) under λ ≥ 800 nm irradiation for 3 h, respectively. This work not only illustrates the interfacial energy migration mechanism between NGFYE and CdS, but also provides insights for the rapid construction of heterojunction materials with efficient energy transfer interfaces.
研究领域:
材料科学
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环境科学
·
理论化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 8
·1359-1367
·
IF 3.117
Qinqin Shao,Chao Yang,Xiaoxu Chen,Hong Zhang,Guoying Feng,Shouhuan Zhou
Lanthanide doped hexagonal phase (β) rare earth fluoride (NaREF4) nanocrystals have considerable potential in laser and, especially, biological applications. However, their large size and extreme synthetic conditions have become unavoidable obstacles in their path to various applications. Herein, a core-mediated hetero-shell growth method was adopted to synthesize α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals, in which cubic phase (α) NaGdF4 was used as the core to induce the subsequent growth of a β-NaLuF4:Nd3+ shell via a two-step solvothermal reaction. The resulting α-NaGdF4@β-NaLuF4:Nd3+ core–shell nanocrystals were characterized by structural analysis, photoluminescence spectroscopy and decay lifetime. Besides, a persuasive lattice-disordered heterointerface-induced mechanism was proposed to understand the core-mediated hetero-shell growth. Meanwhile, the influence of the heterointerface on the dynamic growth of the shell nanocrystals was also investigated in detail. Most importantly, the near-infrared luminescence intensity at 1.06 μm was enhanced by over two times via coating the lattice-matched homogeneous NaLuF4 shell on the surface of α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals. The high-performance α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals thus obtained are expected to be used for laser output and depth detection of biological tissues.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 37
·25681-25690
·
IF 3.9
Jie Liang,Ting Fan,Jian-tao Lü,Tianjie Guan,Ting-ting Deng,Bangyun Xiong
NaGdF4:Ce,Eu,Tb nanocrystals were successfully prepared by a one-step hydrothermal method with Ce3+ ions as sensitizers, Eu3+ and Tb3+ ions as activators, and polyethylenimine (PEI) as surfactants. Color-adjustable fluorescence emission was achieved by the energy transfer effect between rare earth ions. Blue fluorescent carbon quantum dots (CDs) with a double UV response under 254 nm and 365 nm excitation were synthesized by a one-step hydrothermal method. A hydrophilic NaGdF4:Ce,Eu,Tb/CD composite ink was prepared by an easy physical mixing method. Because of the electrostatic self-assembly effect, the color adjustable luminescence was achieved in a few seconds, and the white light emission with color coordinates of (0.32, 0.32) was obtained. A dual-mode luminescence anti-counterfeiting pattern was designed and achieved by excitation with ultraviolet light at 254 nm and 365 nm.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 31
·5900-5905
·
IF 4.034
Bin-Bin Ding,Kun Liu,Fu Zhang,Yang Wang,Sheng Cheng,Yang Lu,Hai-Sheng Qian
Upconversion fluorescent nanostructures with controlled sizes and morphologies have attracted much attention due to their potential and important applications in bioimaging, photodynamic therapy, solar cells and so on. In this work, we describe a facile successive process to fabricate β-NaGdF4:Yb,Er nanocrystals coated with an ultrathin layer of CaF2 with enhanced upconversion fluorescence and stability. The as-prepared β-NaGdF4:Yb,Er@CaF2 nanoparticles were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM, JEM 21000), fluorescence spectroscopy (Hitachi High-Technology Corporation, F-2700) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The as-prepared core–shell nanoparticles show enhanced upconversion fluorescence and superior magnetic resonance (MR) relaxivity. In addition, the as-prepared β-NaGdF4:Yb,Er@CaF2 nanoparticles show enhanced chemical stability after surface functionalization and transfer into aqueous solutions.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Wei Tang,Ruo Mi,Lun Wang,Hongqi Chen
A quantitative image analysis and separation system was designed for detection of human immunodeficiency virus (HIV) related DNAs in the red region by combining of upconversion luminescence nanoprobe and magnetic beads (MBs). Carboxyl-modified NaGdF 4 :Yb, [email protected] 4 upconversion nanoparticles (UCNPs) were connected to single-stranded DNA to form a reporter probe, while carboxyl-modified magnetic beads were connected to another single-stranded DNA to form a capture probe. In the presence of target HIV DNAs, NaGdF 4 :Yb, [email protected] 4 UCNPs and magnetic beads were conjugated to form UCNPs-DNA-MBs nanocomplexes through DNA-DNA heteroduplexes based on the principle of complementary base pairing. After magnetic separation, the upconversion luminescence intensity of UCNPs-DNA-MBs nanocomplexes was related to the concentration of the target HIV DNAs. The detection methods were investigated by fluorescence spectrometry and quantitative image analysis based on upconversion luminescence total internal reflection (TIR) imaging platform. Compared to the luminescence spectral analysis, the quantitative image analysis shows higher sensitivity (linear range of 0.02−30 nM and detection limit of 0.0102 nM). More importantly, this method only needs 10 μL sample and the analysis time is about 0.1 s. The method combines quantitative image analysis with magnetic separation technology, which has the characteristics of low background interference and high separation efficiency allowing for application to the field of biology.
研究领域:
分析化学
·
生物技术
·
纳米技术
·
病毒学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 47
·31675-31683
·
IF 4.123
Zhichao Yu,Haifeng Zhou,Guangjun Zhou,Juan Zhou,Yaqiang Wu,Xingshuang Zhang,Tao Wang,Dapeng Huang,Xinqiang Wang,Jifan Hu
The energy-upconversion of lanthanide-doped nanoparticles with a core–shell structure can be utilized to enhance and tune optical properties and can generate multifunctionality in a single system. Herein, the core–shell nanoparticles NaYF4:Yb,Ho,Tm@NaGdF4 were prepared by thermally decomposing lanthanide acetylacetonate precursors. Through modifying the molar ratio of the core and shell, nanodumbbell-shaped particles with different sizes and morphologies were precisely synthesized. The formation mechanism and the heterogeneous epitaxial growth process of the nanodumbbell-shaped particles were studied. After coating the shell layer, upconversion luminescence intensities, spectral purity and fluorescence lifetimes were improved. Furthermore, the magnetic performance of the core–shell nanoparticles was characterized. The optical–magnetic bifunctional upconversion core–shell particles with programmable shape and multiple properties provide an ideal platform for the preparation of nanodumbbell-shaped particles and the promotion of upconversion materials for biomedical research.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 42
·5081-5085
·
IF 2.596
Hongqi Chen,Huihui Wang,Wanying Xia,Jianguo Zhang,Lun Wang
In this work, we developed a simple and selective luminescence sensing system for detecting ascorbic acid (AA) based on NaGdF4:Yb,Er@NaYF4 upconversion nanoparticles (UCNPs) and oxidase-like CoOOH nanoflakes. When p-phenylenediamine (PPD) and oxidase-like CoOOH nanoflakes were added to the UCNPs solutions, PPD, as a typical substrate of oxidase, could be oxidized to PPDox. The luminescence intensity of UCNPs was quenched because PPDox could play a role as an energy acceptor. When AA was added to the above solution mixture, the CoOOH nanoflakes were destroyed, and then, the luminescence intensity was recovered. Under the best experimental conditions, the linear range for detection of AA was 0.8 to 280 μM, and the detection limit was 0.25 μM. Furthermore, the system could be applied to real sample analysis with satisfactory results.
研究领域:
分析化学
·
纳米技术
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）