JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jingxiao Liu,Zhichun Zou,Fei Shi,Xin Song,Haoyuan Zhang,Han Zhang,Xiaoying Song,Xinran Zhao,Zixuan Wang,Jiahong Kang
In order to further improve the luminescence of NaYF 4 :Yb,Er, we successfully constructed pitaya-like Cs 0 · 3 WO 3 @NaYF 4 :Yb, Er particles, in which Cs 0 · 3 WO 3 particles were encapsulated in NaYF 4 :Yb, Er particles. This structure enhanced the intensity of 407, 527, 542 and 657 nm emission peaks by 10.1, 5.9, 5.5 and 1.8 times, respectively. Through calculated, the Commission Internationale de l’Eclairage (CIE) chromaticity coordinates changed from (0.28, 0.71) to (0.25, 0.73), indicating that the emission colour was tuned from yellow to green. The construction mechanism of this structure and the mechanism of upconversion (UC) luminescence enhancement were discussed. By studying the different luminescence mechanisms of NaYF 4 :Yb, Er excited by 1550 and 980 nm laser, we found that the UC luminescence enhancement and colour tuning of NaYF 4 :Yb, Er were due to the localized surface plasmon resonance (LSPR) effect of Cs 0 · 3 WO 3 , which can absorb more excited photons and transfer them to the Er 3+ ion 4 I 11/2 level. Given that the transition process of green light emission is easier than red light emission, the redundant photons are more inclined to achieve emitting green light and show UC luminescence enhancement and emission colour tuning. Overall, the as-prepared novel pitaya-like Cs 0 · 3 WO 3 @NaYF 4 :Yb, Er particles exhibit strong UC luminescence enhancement and colour tuning, thus having great application prospect in the field of luminescent displays.
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-10
·
IF 3.159
Yuan Maohui,Wang Rui,Zhang Chaofan,Yang Zining,Yang Xu,Han Kai,Ye Jingfeng,Wang Hongyan,Xu Xiaojun
The presence of manganese ions (Mn 2+ ) in Yb/Er-co-doped nanomaterials results in suppressing green (545 nm) and enhancing red (650 nm) upconversion (UC) emission, which can achieve single-red-band emission to enable applications in bioimaging and drug delivery. Here, we revisit the tunable multicolor UC emission in a single Mn 2+ -doped β-NaYF 4 :Yb/Er microcrystal which is synthesized by a simple one-pot hydrothermal method. Excited by a 980 nm continuous wave (CW) laser, the color of the single β-NaYF 4 :Yb/Er/Mn microrod can be tuned from green to red as the doping Mn 2+ ions increase from 0 to 30 mol%. Notably, under a relatively high excitation intensity, a newly emerged emission band at 560 nm ( 2 H 9/2 → 4 I 13/2 ) becomes significant and further exceeds the traditional green (545 nm) emission. Therefore, the red-to-green (R/G) emission intensity ratio is subdivided into traditional (650 to 545 nm) and new (650 to 560 nm) R/G ones. As the doped Mn 2+ ions increase, these two R/G ratios are in lockstep with the same tunable trends at low excitation intensity, but the tunable regions become different at high excitation intensity. Moreover, we demonstrate that the energy transfer (ET) between Mn 2+ and Er 3+ contributes to the adjustment of R/G ratio and leads to tunable multicolor of the single microrod. The spectroscopic properties and tunable color from the single microrod can be potentially utilized in color display and micro-optoelectronic devices.
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Analytical Methods
·
2017
·Vol. 9
·期 5
·835-840
·
IF 1.9
Zhongling Gao,Lei Wang,Lun Wang,Hongqi Chen
Long wavelength luminescent NaYF4:Yb,Er/NaGdF4 core–shell upconversion nanoparticles that were synthesized and modified with poly(acrylic acid) (PAA) were used to detect sulfide ions. The NaYF4:Yb,Er/NaGdF4 core–shell upconversion nanoparticles were synthesized to give an emission peak in the red-light region. When the carboxyl-functionalized NaYF4:Yb,Er/NaGdF4 core–shell upconversion nanoparticles and cupric ions (Cu2+) were mixed, the luminescence was quenched because of coordination between the carboxyl of PAA and Cu2+. However, when sulfide ions were added into the system, due to the competitive binding between S2− and Cu2+, the luminescence of the NaYF4:Yb,Er/NaGdF4 core–shell upconversion nanoparticles was recovered. Based on the recovery of the luminescence intensity, a turn-on system for the detection of sulfide ions was designed. Under optimal conditions, the linear range for the detection of sulfide ions ranged from 2.63 × 10−2 to 2.25 × 102 μM (R = 0.99) with a limit of detection for sulfide ions as low as 2.20 × 10−2 μM. The method was successfully applied to sulfide ion sensing in different environments.
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JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 22
·期 3
·944-950
·
IF 5.101
Yuan Ren,Min Chen,Linfeng Hu,Xiaosheng Fang,Limin Wu
This paper presents an oil/water interface self-assembly strategy for the fabrication of hydrophobic nanoparticles into mono- and multi-layered nanofilms with NaYF4:Yb,Er nanoplatelets as a prototype. In this approach, hydrophobic β-NaYF4:Yb,Er nanoplatelets dispersed in chloroform solvent are used as the sub-phase, then a certain amount of water is added to produce a chloroform/water interface. When ethanol is added, the up-conversion NaYF4:Yb,Er nanoplatelets are found to readily self-assemble at the oil/water interface into a closely-packed mono- or multi-layer nanofilm with a preferred [001] orientation. Compared with the previous water/oil interface self-assembly strategy, the present method is not only used for fabrication of hydrophobic nanoparticles into high quality nanofilms, but also is environmentally friendly and is safe to the operator.
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Journal of Physical Chemistry C
·
2018
·
IF 4.484
Raheel Ahmed Janjua,Chan Gao,Rucheng Dai,Zhilei Sui,Muhammad Aqeel Ahmad Raja,Zhongping Wang,Xianxu Zhen,Zengming Zhang
Ultrasmall pure hexagonal phase NaYF4:Yb,Er is successfully prepared via the solvothermal method. The upconversion (UC) luminescence of hexagonal phase NaYF4:Yb,Er nanocrystals is ten times stronger than that of cubic phase nanocrystals with the same size of 6 nm. XRD results reveal that heating above 673 K leads to conversion of the hexagonal phase to the high-temperature cubic phase, whereas the cubic nanocrystals undergo phase transformation from normal cubic at room temperature to hexagonal at 673 K and further to high-temperature cubic above 773 K. The hexagonal nanocrystals exhibit emission enhancement after heat treatment up to 573 K. Further heating above 773 K induces a decreasing trend in emission due to the phase transition to the high-temperature cubic phase. The cubic phase exhibits decreasing luminescence with temperature due to strong cross relaxation and then increasing luminescence above the temperature of 673 K due to the hexagonal phase transformation. The luminescent properties of both the normal cubic phase and high-temperature cubic phase indicate that different crystal fields exist in these two phases due to the rearrangement of ligands around Er3+ at high temperature.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Hongqi Chen,Wei Tang,Yunchun Liu,Lun Wang
In this work, a quantitative image analysis method based on cyanine dye-upconversion nanoparticles composite luminescent nanoprobe for the detection of nitrite was developed. The nanoprobe was constructed by combining the NaYF 4 :Yb,Tm@NaYF 4 upconversion nanoparticles (UCNPs) and the new cyanine dye IR-790. The upconversion nanoparticles transferred energy to IR-790, resulting in the luminescence quenching, while the luminescence of UCNPs was recovered after adding NO 2 − . The increase in photons was related to the concentration of NO 2 − . Under the optimal experimental conditions, the detection range was 0.20–140 μM and the limit of detection was 0.030 μM. The measurement for NO 2 − can be completed in 29 min. The method has the characteristics of fast response (~0.1 s), low sample consumption (10 μL) and powerful data support (550 frame time series images). Furthermore, the quantitative image analysis method was successfully applied for the analysis of nitrite in environmental water and food samples.
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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.
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Analytical Methods
·
2017
·Vol. 9
·期 20
·2977-2982
·
IF 1.9
Yuanhui Ma,Liping Zhang,Lei Wang,Lun Wang,Hongqi Chen
A novel surface plasmon resonance (SPR) enhanced upconversion (UC) luminescence system was designed for the detection of α-fetoprotein (AFP) by using gold nanoparticle (NP) coated NaYF4:Yb,Er,Gd upconversion nanoparticles (UCNPs) as probes. The gold NP coated NaYF4:Yb,Er,Gd UCNPs had a strong emission at 665 nm and were modified with poly(acrylic acid) (PAA) before being conjugated with anti-AFP (Ab1). When the AFP antigens were added to the system, the binding affinity between AFP and Ab1 resulted in a reduced distance between the gold NP coated UCNPs. The UC luminescence intensity of this system was enhanced because of the SPR properties of the gold NPs. The sensing system exhibited a high sensitivity, good specificity, and wide linear range, 0.098–15.0 ng mL−1 for the detection of AFP (R = 0.99), with a detection limit as low as 0.095 ng mL−1 under optimal conditions. The method was successfully applied to AFP sensing in human serum samples.
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JOURNAL OF LUMINESCENCE
·
2015
·
IF 2.719
ShaoZhen Wang,Jianguo Zhang,Hongqi Chen,Lun Wang
A new serum ferritin (SF) biosensor based on fluorescence resonance energy transfer (FRET) from Mn 2+ -doped NaYF 4 :Yb,Tm up-converting rare-earth nanophosphors (UCNPs, donor) to gold nanorods (GNRs, acceptor) was developed in the near-infrared (NIR) region. The as-prepared Mn 2+ -doped NaYF 4 :Yb,Tm UCNPs exhibited a strong emission at 807 nm in the NIR region and were modified with poly-(acrylic acid) (PAA) before conjugating with anti-SF (Ab 1 ). The negatively charged donor (Ab 1 -UCNPs) and the positively charged acceptor (GNRs) were mixed in close proximity due to electrostatic interactions, which quenched the fluorescence emission of the Mn 2+ -doped NaYF 4 :Yb,Tm UCNPs. However, added SF combines with the anti-SF because the binding affinity between SF and Ab 1 is stronger than the electrostatic interactions. Thus, the acceptor separated from the donor, and the fluorescence was restored. Under optimal conditions, the restored fluorescence exhibited a linear relationship with SF concentrations ranging from 0.23 to 16.88 ng/mL and a limit of detection as low as 0.12 ng/mL. The proposed method was also used to monitor SF in human serum samples.
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ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Ji-Wei Shen,Cheng-Xiong Yang,Lu-Xi Dong,Hao-Ran Sun,Kai Gao,Xiu-Ping Yan
Rational design and fabrication of multimodal imaging nanoprobes are of great significance for in vivo imaging. Here we report the fabrication of a multishell structured NaYF4:Yb/Tm@NaLuF4@NaYF4@NaGdF4 nanoprobe via a seed-mediated epitaxial growth strategy for upconversion luminescence (UCL), X-ray computed tomography (CT), and magnetic resonance (MR) trimodal imaging. Hexagonal phase NaYF4:Yb/Tm is used as the core to provide UCL, while the shell of NaLuF4 is epitaxially grown on the core not only to provide an optically inert layer for enhancing the UCL but also to serve as a contrast agent for CT. The outermost NaGdF4 shell is fabricated as a thin layer to give the high longitudinal relaxivity (r1) desired for MR imaging. The transition shell layer of NaYF4 not only provides an interface to facilitate the formation of NaGdF4 shell but also inhibits the energy transfer from inner upconversion activator to surface paramagnetic Gd3+ ions. The fabricated multishell structured nanoprobe shows intense near-infrared UCL, high r1 value of 3.76 mM–1 s–1, and in vitro CT contrast effect. The multishell structured nanoprobe offers great potential for in vivo UCL/CT/MR trimodal imaging. Further covalent bonding of folic acid makes the multishell structured nanoprobe promising for in vivo targeted UCL imaging of tumor-bearing mice.
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JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Zhuoyue Li,Zhenlong Cheng,Maoxiu Huang,Qingkai Chen,Yuanli Liu,Zhiyi He,Jun Ou
In this paper, highly fluorescent, structurally homogeneous, and small-sized NaYF 4 upconversion nanoparticles were synthesized via the hydrothermal method, Yb/Ho/Mn co-doping altered the local symmetry of the crystals, slightly deforming their structure and enhancing the fluorescence intensity of the nanocrystals. The strong green light emission from the synthesized samples was mechanistically explained by energy transfer upconversion combined with excited state absorption process involving Yb-Mn dimers. The highest fluorescence intensity was observed with 15 mol% Mn 2+ , which increased the fluorescence intensity by a factor of approximately 10.88 compared to the undoped sample. Furthermore, this work explored the optical temperature-sensing properties of these upconversion fluorescent nanocrystals for non-contact temperature measurement, leveraging thermal and non-thermal coupling mechanisms. It provided a promising strategy for developing high-performance optical temperature sensors using other transition metal-doped lanthanide materials.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 42
·15897-15905
·
IF 8.067
Hanchang Huang,Maohui Yuan,Zhongyang Xing,Wenda Cui,Tongcheng Yu,Shuai Hu,Guomin Zhao,Chuan Guo,Kai Han
In lanthanide-sensitized upconversion (UC) nanomaterials, the typical sensitizer Yb3+ can significantly modulate the codoped activator (such as Er3+ ions) to generate multiband transitions. However, the kinetics of these multiband emissions affected by the Yb3+ concentration remains unclear. In this work, we employ nanosecond time-resolved spectroscopy to investigate a single optically trapped NaYF4:Yb/Er microcrystal (MC) doped with different Yb3+ concentrations. Interestingly, high doping Yb3+ ions shorten the UC response time by a factor of 10 (from ∼1 μs to ∼100 ns) compared to low doping Yb3+. Meanwhile, 430 nm light (4G7/2 → 4I11/2) emitted before 654 nm (4F9/2 → 4I15/2) with Yb3+ dramatically increasing (opposite to the normal low Yb3+ doping cases), representing a new four-photon pathway (4I15/2 → 4I11/2 → 4F7/2 → 2H11/2 →4S3/2 → 2G7/2 → 4G11/2 → 2H9/2 → 2D5/2 → 4G7/2). Furthermore, we observed a broad range of time-dependent emission color, changing from being initially green over near-white to red. Particularly, the red emission is dominated in the decay process, yielding insight into the fundamental multiband UC kinetics. The result shows that varying the Yb3+ doping concentration provides a way to control the energy flow between the energy levels of Er3+ ions, which can modulate the response time and color evolution of UC on Yb/Er doped materials. This can direct the prospective development of fast-response optoelectronic devices, photocatalysis, and UC displays in the future.
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