Frontiers in Chemistry
·
2023
·
IF 5.5
Huang Hanchang,Zhong Yanyi,Li Mingchen,Cui Wenda,Yu Tongcheng,Zhao Guomin,Xing Zhongyang,Guo Chuan,Han Kai
In Yb-Er co-doped upconversion (UC) nanomaterials, upconversion luminescence (UCL) can be modulated to generate multiband UCL emissions by changing the concentration of activator Er3+. Nonetheless, the effect of the Er3+ concentrations on the kinetics of these emissions is still unknown. We here study the single β-NaYF4:Yb3+/Er3+ microcrystal (MC) doped with different Er3+ concentrations by nanosecond time-resolved spectroscopy. Interestingly, different Er3+ doping concentrations exhibit different UCL emission bands and UCL response rates. At low Er3+ doping concentrations (1 mol%), multiband emission in β-NaYF4:Yb3+/Er3+ (20/1 mol%) MCs could not be observed and the response rate of UCL was slow (5–10 μs) in β-NaYF4:Yb3+/Er3+. Increasing the Er3+ doping concentration to 10 mol% can shorten the distance between Yb3+ ions and Er3+ ions, which promotes the energy transfer between them. β-NaYF4:Yb3+/Er3+ (20/10 mol%) can achieve obvious multiband UCL and a quick response rate (0.3 µs). However, a further increase in the Er doping concentration (80 mol%) makes MCs limited by the CR process and cannot achieve the four-photon UC process (4F5/2 → 2K13/2 and 2H9/2 → 2D5/2). Therefore, the result shows that changing the Er3+ doping concentration could control the energy flow between the different energy levels in Er3+, which could affect the response time and UCL emission of the Yb/Er doped rare earth materials. Our work can facilitate the development of fast-response optoelectronics, optical-sensing, and display industries.
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PubMed
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Yunfei Ma,Wenhui Yue,Zehong Xu,Ziwei Ye,Jinlong Zhang
Composite nanoparticles consisting upconversion nanoparticles (β-NaYF 4 :Yb/Er) and nitrogen doped TiO 2 nanoparticles were constructed via a chemical assembly method. Efficient energy transfer was enabled since the upconverted energy matched up with the band gap of N-TiO 2 . This enables the resulting composite nanoparticles to possess excellent Rhodamine B (RhB) degradation activity under near infrared (NIR) light irradiation.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 10
·4806-4813
·
IF 3.925
Jie Song,Leilei Sun,Hongchao Geng,Wenlong Tan,Deshuai Zhen,Qingyun Cai
β-Phase NaYF4:Yb,Tm,Gd up-conversion nanorods (UCNRs) with high uniformity were synthesized by a solvothermal method. The optimal fluorescence intensity of UCNRs was explored. After further modification with Materials of Institute Lavoisier-100(Fe) (MIL-100(Fe)) by the layer-by-layer self-assembly method, near-infrared light-triggered UCNR@MIL-100(Fe) nanomaterials with excellent antibacterial performances were constructed. A core–shell structure was constructed and confirmed by transmission electron microscopy (TEM). Reactive oxidizing species (ROS) detection indicated that the nanomaterials owned good photodynamic efficacy. The antibacterial experiments showed that the nanomaterials with 980 nm light irradiation and hydrogen peroxide (H2O2) had good antibacterial activity against Gram-negative and Gram-positive bacteria. Under 980 nm laser excitation, UCNRs generated ultraviolet and visible light to activate MIL-100(Fe) and induced a photo-Fenton reaction, which further produced oxygen species for antibacterial applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 5
·6269-6282
·
IF 2.478
Chen Zhangxu,Fu Minglian,Zheng Bingyun,Zhu Danchen,Chen Zefan
The influencing factors of chelator, reaction times, and Yb 3+ /Tm 3+ -doped concentration on the formation of NaYF 4 :Yb,Tm crystals with various morphologies have been investigated and determined. It is found that NaYF 4 :Yb,Tm with various morphologies and different phases can be tuned. Compared with the addition of ethylene diamine tetra acetic acid, hexagonal nanoprism-like β-NaYF 4 :Yb,Tm with a mean length of ~ 1300 nm and diameter of ~ 100 nm is prepared in the presence of oleic acid, which preferentially orients along with the [0001] direction more quickly than others. Systematical research on the emission of Yb 3+ /Tm 3+ -doped NaYF 4 crystals with microrod, hexagonal microprism, and nanoplate has implied that these obtained crystals with unique optical properties are closely related to their morphologies, phases, and sizes. In addition, a possible growth mechanism of co-existence of α- and β-NaYF 4 phases is proposed. It can be expected to illustrate the formation mechanism for the upconversion crystals or other rare-earth upconversion materials and to import these highly luminescent microcrystals or nanocrystals to environmental remediation by full solar energy spectra.
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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.
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高影响因子
Materials Express
·
2018
·Vol. 8
·期 2
·141-148
·
IF 1.597
Tan Haihu,Xie Shaowen,Li Na,Tong Chao,Xu Lijian,Xu Jianxiong,Zhang Changfan
Luminescent polymer composite films were prepared by aqueous solution casting method employing poly(vinyl alcohol) (PVA) as a matrix polymer and NaYF4:Yb, Er up-conversion phosphors (UCPs) as the filler. A series of luminescent UCP/PVA composite films were obtained by varying
the amount of the UCP filler. The effects of UCP incorporation on the structure, morphology, thermal stability and optical properties were also examined. The well-dispersed UCPs in the polymer matrix enhanced the thermal stability of composite films due to hydrogen bonding between the PVA
and UCPs. Besides, the incorporation of UCPs did not greatly decrease the transparency of films but imparted fluorescent properties to the polymer matrix. The fabricated UCP/PVA composite films exhibited strong up-conversion photoluminescence upon the 980 nm laser excitation. The UCP/PVA composite
fluorescent films may have promising application in anti-counterfeiting packaging and in other optics related fields.
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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.
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高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 42
·6032-6037
·
IF 1.9
Bo Ling,Yuanhui Ma,Hongqi Chen,Lun Wang
A new aptamer-based surface plasmon resonance (SPR) system has been designed to detect Hg2+ that utilizes near-infrared (NIR)-to-NIR gold nanoparticle coated NaYF4:Yb,Tm,Gd up-conversion nanoparticles (AuNPs@NaYF4:Yb,Tm,Gd UCNPs) as probes. The AuNPs@NaYF4:Yb,Tm,Gd UCNPs were prepared and excited by near-infrared light (980 nm) which emitted at a near-infrared wavelength (808 nm) using an inexpensive infrared continuous wave laser diode. The AuNPs@NaYF4:Yb,Tm,Gd UCNPs were conjugated with Hg2+ aptamers. In the presence of Hg2+, the AuNPs@NaYF4:Yb,Tm,Gd UCNPs were brought into close proximity because of the formation of T–Hg2+–T base pairs. Then the luminescence enhanced because of the plasmon resonance effects. Based on this, a new SPR system was developed for the detection of Hg2+ that had high sensitivity and selectivity in the NIR region. This method was successfully applied to detect Hg2+ concentration in real samples.
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高影响因子
JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Xuhua LIANG,Jun FAN,Yongbo WANG,Yanyan ZHAO,Ruyi JIN,Tao SUN,Min CHENG,Xuejun WANG
In this paper, we demonstrated a one-step template-free strategy to fabricate a hollow mesoporous structured NaYF 4 :Yb,Er nanoparticles with excellent upconversion luminescence. Folic acid (FA), a commonly used cancer-targeting agent, was conjugated on the surface of the nanoparticles based on the presence of free amine groups, which were labeled as NaYF 4 :Yb,Er-FA HMUCNPs. The properties were extensively studied, which indicated the obtained samples showed a typical hollow mesoporous structure and excellent upconversion luminescence that were useful for cell imaging and drug delivery. The L929 cells viability, hemolysis assay and coagulation test demonstrated good biocompatibility of the samples. The anti-cancer drug doxorubicin hydrochloride (DOX) storage/release properties were demonstrated to be pH-responsive, in which, the drug release might be beneficial at the reduced pH for targeted release and controlled therapy. Moreover, it was found that DOX-loaded NaYF 4 :Yb,Er-FA HMUCNPs exhibited greater cytotoxicity to KB cells than free DOX due to the specific cell uptake by KB cells via folate receptor-mediate endocytosis. Therefore, the multifunctional nanoparticles combining upconversion luminescent property and hollow mesoporous structure have potential for simultaneous targeted anti-cancer drug delivery and cell imaging.
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高影响因子
TALANTA
·
2016
·
IF 4.035
Yueli Hu,Boyue Wu,Qing Jin,Xueyuan Wang,Yan Li,Yuxiu Sun,Jianzhong Huo,Xiaojun Zhao
5 nm intense green emission NaYF 4 :Yb/Er upconversion nanoparticles (UCNPs) with pure β phase was synthesized with a simple “green” strategy for the first time. Traditional organic solvothermal method is often applied to prepare the high-quality and uniform UCNPs, but the preparation of lanthanide-oleate complexes is laborious as heating and multistep post-treatment for purification are often required. The water-alcohols solvothermal method is environmentally friendly, but the fabricated UCNPs have big size, poor biocompatibility and high cytotoxicity, which limited their application for cell imaging. Herein, NaYF 4 :Yb/Er UCNPs were prepared with rare-earth nitrates RE(NO 3 ) 3 (RE=Y 0.80 Yb 0.18 Er 0.02 ) as precursors and diethylene glycol (DEG)/ethylene glycol (EG)/water as the solvent. A facile green solvothermal method with the temperature being controlled at 300 °C was developed. The as-prepared NaYF 4 :Yb/Er UCNPs were characterized and were found to have enhanced UC emission and controllable particle size. The as-prepared UCNPs were further functionalized via folic acid coating for the targeted imaging and improved bio- compatibility. It was made the UCNPs potential for upconversion bioimaging of living cells by the strong upconversion luminescence, the excellent biocompatibility, and the super-small size. The good colloidal stability and low cell cytotoxicity of the as-prepared UCNPs and the developed synthesis protocol might advance both the fields of UCNPs and biomolecule-based nanotechnology for future studies.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Guangliang Lu,Yiping Zhang,Jianlian Song,Yuhan Jing,Xingyu Li,Rao Qin,Da Biao Zhai,Jiangang Jiang,Yiping Wang,He Wang
Traditional methods for latent fingerprint (LFP) detection often suffer from insufficient contrast and background interference, limiting their effectiveness in forensic applications, particularly in complex environments. This study introduces an innovative approach that combines Fe 3+ -doped NaYF 4 :Yb, Er upconversion nanoparticles (UCNPs) with digital image processing technology. By optimizing the Fe 3+ doping concentration (15 % mmol) and synthesis temperature (220 °C), the red emission intensity at 655 nm was enhanced by 13.96 times compared to undoped samples. The amplified red emission originates from energy transfer of | 2 F 7/2 , 4 T 1g ⟩ (Yb 3+ -Fe 3+ dimer) to 4 F 9/2 (Er 3+ ) states, coupled with crystalline field symmetry distortion induced by Fe 3+ codoping. Dynamic studies of 4 S 3/2 and 4 F 9/2 states under 980 nm pulsed laser excitation, alongside diffuse reflectance analysis, corroborate the proposed upconversion mechanism. Additionally, The optimized UCNPs demonstrated high biocompatibility and stability, achieving LFP visualization with contrast ratios up to 85.03 % and structural similarity scores exceeding 91.58 % via MATLAB-based digital image processing, a significant improvement over conventional methods. This work establishes a robust, non-toxic LFP detection system with potential applications in forensic science.
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高影响因子
ChemPhotoChem
·
2017
·Vol. 1
·期 8
·369-375
·
IF 0
Xuesong Zhai,Ying Wang,Xiaojuan Liu,Shihu Liu,Pengpeng Lei,Shuang Yao,Shuyan Song,Liang Zhou,Jing Feng,Hongjie Zhang
Graphical It′s all under control : Ultrasmall NaYF 4 :Yb,Er upconversion nanocrystals have been prepared by the simultaneous addition of two methanolic solutions of NH 4 F and NaOH into a rare-earth-salt precursor solution. A large number of hexagonal-phase seeds are quickly formed as a result of the low energy barrier, resulting in an ultrasmall particle size. Precise control over the size and crystallographic phase of nanocrystals allows the manipulation of their properties and applications as desired. Hexagonal-phase NaYF 4 (β-NaYF 4 ) upconversion nanocrystals with efficient luminescence are quite desirable for bio-applications, but synthetic control over the nanocrystallite size remains challenging. Herein we verify experimentally that control of the hexagonal-phase nucleation is crucial for controlling the final particle size and the number of hexagonal-phase seeds strongly depends on the actual F(Na):Y ratio. A negligible number of hexagonal-phase seeds were formed at low ratio whereas the high ratio yields a very large number of seeds. We also identify that the actual F(Na):Y ratio is more likely related to the different methods employed for the addition of NH 4 F and NaOH rather than its initial feeding ratio. By taking advantage of this dependence and varying the reaction conditions (temperature and time), β-NaYF 4 :Yb,Er nanocrystals with a size smaller than 6 nm can be synthesized. Theoretical modeling shows a good agreement with the experimental results.
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