ACS Nano
·
2012
·
IF 11.421
Yunlu Dai,Ping’an Ma,Ziyong Cheng,Xiaojiao Kang,Xiao Zhang,Zhiyao Hou,Chunxia Li,Dongmei Yang,Xuefeng Zhai,Jun Lin
In this study, we report a new controlled release system based on up-conversion luminescent microspheres of NaYF4:Yb3+/Er3+ coated with the smart hydrogel poly[(N-isopropylacrylamide)-co-(methacrylic acid)] (P(NIPAM-co-MAA)) (prepared using 5 mol % of MAA) shell. The hybrid microspheres show bright up-conversion fluorescence under 980 nm laser excitation, and turbidity measurements show that the low critical solution temperature of the polymer shell is thermo- and pH-dependent. We have exploited the hybrid microspheres as carriers for Doxorubicin hydrochloride (DOX) due to its stimuli-responsive property as well as good biocompatibility via MTT assay. It is found that the drug release behavior is pH-triggered thermally sensitive. Changing the pH to mildly acidic condition at physiological temperature deforms the structure of the shell, causing the release of a large number of DOX from the microspheres. The drug-loaded microspheres exhibit an obvious cytotoxic effect on SKOV3 ovarian cancer cells. The endocytosis process of drug-loaded microspheres is observed using confocal laser scanning microscopy and up-conversion luminescence microscopy. Meanwhile, the as-prepared NaYF4:Yb3+/Er3+@SiO2@P(NIPAM-co-MAA) microspheres can be used as a luminescent probe for cell imaging. In addition, the extent of drug release can be monitored by the change of up-conversion emission intensity. These pH-induced thermally controlled drug release systems have potential to be used for in vivo bioimaging and cancer therapy by the pH of the microenvironment changing from 7.4 (normal physiological environment) to acidic microenvironments (such as endosome and lysosome compartments) owing to endocytosis.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiyao Tian,Yuning Ma,Junchao Zhang,Hongxia Wang,Yiwang Tang,Jia Lu,Liangyun Yu,Xintong Liu,Xiulan Xin
The development of luminescent materials exhibiting dual luminescent modes for anti-counterfeiting purposes is of significant importance. In this study, we introduce and synthesize hybrid materials composed of carbon quantum dots and up-conversion particles (CDs@UCNP). By combining Yb 3+ and Er 3+ doped NaYF 4 up-conversion nanoparticles with carbon quantum dots, we successfully prepared a kind of fluorescent materials that demonstrate dual-mode fluorescence. By changing the fluorescent color of carbon quantum dots to achieve different down-conversion (DC) luminescence, we produced three dual-mode luminescent materials: BCDs@UCNP, YCDs@UCNP, and RCDs@UCNP, which exhibit blue, yellow, and red DC luminescence when exposed to 365 nm ultraviolet light, alongside green or red up-conversion luminescence under 980 nm laser. Furthermore, we formulated three water-based inks utilizing water-based acrylic emulsion as a binder. These inks exhibit dual-mode tunable luminescence properties, thereby enhancing the security of the printed patterns and positioning them as promising candidates for anti-counterfeiting applications.
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高影响因子
Nanoscale Horizons
·
2018
·Vol. 3
·期 6
·616-623
·
IF 9.391
Baoqi Liu,Zhipeng Meng,Suli Wu,Yue Wu,Shufen Zhang
Rational control of the multiple emission outputs and achieving single-band and strong luminescence of Ln3+ doped upconversion nanoparticles is highly desirable for their applications in sensor and display fields. Here, we designed a sandwich structure to separate and enhance the green and red emission of NaYF4:Yb3+/Er3+ simultaneously and realized pure strong green and red emissions. NaYF4:Yb3+/Er3+ nanocrystals were sandwiched between two layers of photonic crystals, which have bandgaps at 660 nm and 530 nm, respectively. The photonic crystal with a bandgap at 530 nm on top of the NaYF4:Yb3+/Er3+ layer can filter the green emission of NaYF4:Yb3+/Er3+, prohibiting its emission upward, and at the same time, enhancing its emission downward. Similarly, the photonic crystal with a bandgap at 660 nm can prohibit the transmission of the red emission, and at the same time enhance its reflection in the opposite direction. Consequently, enhanced green emission was observed from the bottom of the sandwich structure and enhanced red emission was observed from the top of the sandwich structure. Thus, the green and red emissions of NaYF4:Yb3+/Er3+ were separated and both of them were enhanced. On the other hand, when using a photonic crystal with a bandgap that overlapped with the excitation light of NaYF4:Yb3+/Er3+ nanoparticles, their emissions were all greatly enhanced. Our results suggest that photonic crystals are good candidates to separate and enhance the emissions of Ln3+ doped luminescent materials.
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 21
·4215
·
IF 4.6
Yukun Tang,Pingping Yang,Jinpu Xie,Tengfei Duan,Zengmin Tang,Yao Liu,Rui Zhang,Haihu Tan,Jingjing Du,Lijian Xu
In recent years, cadmium sulfide (CdS) has been widely investigated due to its excellent photocatalytic performance. However, its practical application in pollutant treatment is limited by its narrow photoresponse range and susceptibility to photocorrosion. Herein, we design a unique four-layer core–shell structure NaYF 4 :Yb 3+ ,Er 3+ @NaYF 4 @CdS@Au (CSNPs@CdS@Au), with an inert NaYF 4 shell coating on NaYF 4 :Yb 3+ ,Er 3+ (CNPs) to form NaYF 4 :Yb 3+ ,Er 3+ @NaYF 4 (CSNPs) and CdS depositing on CSNPs (CSNPs@CdS); Au nanoparticles are loaded on CdS (CSNPs@CdS@Au). Compared with CdS (9.81%), CSNPs (5.0%), CSNPs/CdS (6.9%), and CSNPs@CdS (81.0%), CSNPs@CdS@Au degrades 97.7% Rhodamine B (RhB) within 15 min, exhibiting superior photocatalytic performance, attributable to two key factors: (1) the NaYF 4 inert shell encapsulation amplifies upconversion (UC) luminescence intensity by suppressing surface quenching; and (2) the electron transfer between Au nanoparticles and CdS effectively promotes spatial separation of photogenerated charge carriers and increases reactive active sites. Additionally, after five degradation cycles, CSNPs@CdS@Au still maintains a 93.25% degradation rate for RhB, confirming its excellent stability. This remarkable stability is attributed to the uniquely designed multilayer core–shell architecture, which significantly enhances structural integrity through physical isolation effects. This study establishes a material preparation strategy for efficient photocatalytic pollutant degradation.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 12
·9656-9664
·
IF 1.556
Wang Chuanying,Cheng Xianhua
Yb3+ and Er3+ ions co-doped α-NaYF4:Yb3+, Er3+ nanocrystals were successfully synthesized via a facile hydrothermal method using citric acid (CA) as chelating ligand and NaNO3 as mineralizer. The influences
of the CA/RE (RE= Y+Yb+Er) molar ratio, reaction time, reaction temperature and the NaNO3/RE molar ratio on the crystal phases and shapes of as-prepared products have been well investigated. The possible formation mechanism has been discussed in detail and an aggregation growth
theory has been proposed. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), scanning electron microscopy (SEM), and photoluminescence (PL) spectra were used to characterize the products. Under 980 nm excitation, the emission intensities
of the as-prepared nanocrystals were much stronger than that of the nanocrystals modified by ethylenediaminetetraacetic acid (EDTA). Additionally, the as-prepared products maintained spherical shape and high degree of monodispersion, which is expected to be suggestive for the preparation of
other complex rare earth fluoride compounds.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 8
·8254-8270
·
IF 1.798
Xi Junhua,Ding Mingye,Dai Jianbin,Pan Yajing,Chen Daqin,Ji Zhenguo
In this paper, Yb 3+ /Er 3+ co-doped hexagonal NaYF 4 have been successfully synthesized by solvothermal, thermal decomposition, hydrothermal and molten salt method, respectively. The crystal structures, particle morphologies, sizes and corresponding upconversion luminescent properties of β-NaYF 4 :Yb 3+ /Er 3+ nano/microcrystals are systemically studied. It is interesting to observed that the temperature-dependent UC luminescent properties of β-NaYF 4 :20 %Yb 3+ , 2 %Er 3+ samples are strongly related to their synthesis methods. Comparison of the upconversion luminescence and thermal sensitivity between the β-NaYF 4 :Yb 3+ /Er 3+ samples reveals that β-NaYF 4 :Yb 3+ /Er 3+ sub-microplates synthesized by thermal decomposition method have much stronger green emission intensity, better luminescent thermal stability and higher temperature sensitivity. This findings are relevant to the application of β-NaYF 4 :Yb 3+ /Er 3+ in optical temperature sensors and to the further understanding of the UC luminescent mechanism.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Chunyang Kang,Xianwei Zuo,Lei Zhao,Cuiling Ren,Yan Wang,Yidan Liu,Xin He,Xin Li,Genliang Han
The red emission of upconversion nanoparticles (UCNPs) is located in an “optical window” range of the biological tissue, which has a promising prospect in biology application. In this work, novel red-emitting NaYF 4 :Yb 3+ /Er 3+ UCNPs with CH 3 COO − modifications were synthesized by single-mode focused microwave method. The morphology, structure, and luminescence properties of as-prepared UCNPs were characterized. The results showed that single-mode focused microwave method was an effective approach to prepare hydrophilic and strongly red emission UCNPs within a drastically reduced reaction time (only 10 min) compared to the traditional methods. Importantly, we also demonstrated that the CH 3 COO − modified NaYF 4 :Yb 3+ /Er 3+ UCNPs could be successfully applied for in vitro imaging of HeLa cells. This work not only provides a rapidly synthetic methodology for the preparation of red-emitting UCNPs but also offers an effective material for cancer cell imaging .
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Lei Chen,Yanwen Jing,Zhimin Xu,Mengyao Shao,Shengyan Ge,Xingfu Zhou
The introduction of up-conversion materials converting near infrared light into useable visible light has been proven to be a promising strategy for improving the performance of perovskite solar cells . In this work, the up-conversion material of NaYF 4 :Yb 3+ , Er 3+ nanoparticles (NPs) were successfully prepared by one-step hydrothermal route and incorporated into Al 2 O 3 as the scaffold layer for the air-processed carbon-based mesoscopic perovskite solar cells (MPSCs). FESEM shows that the size of NaYF 4 :Yb 3+ , Er 3+ nanoparticles is about 100 nm and there is no obvious agglomeration. The UV–vis–NIR absorption spectrum of the mixed scaffold layer demonstrates a distinct infrared light response. The infrared photoelectric efficiency and EQE tests were used to verify that NaYF 4 :Yb 3+ , Er 3+ nanoparticles improved the photo response of the device in the infrared region, thereby improved the photoelectric performance of the MPSCs. An optimal efficiency of 13.04% was obtained by incorporating 25 wt% NaYF 4 :Yb 3+ , Er 3+ nanoparticles into the Al 2 O 3 scaffold layer, which shows a 20.6% increase in conversion efficiency when compared with the device without using the up-conversion material (10.81%). The optimized carbon-based MPSCs also show an infrared responded PCE value of 0.11% under infrared irradiation from 800 to 1100 nm. This paper shows that the up-conversion material expands the light response of solar cells to the infrared region and provides an effective method for the preparation of high-efficiency perovskite solar cells.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2020
·
IF 4.706
Hao Tang,Ying Xu,Xianhua Cheng
To investigate the optical properties of rare earth upconversion particle, the Cr 3+ and alkaline-earth ions (Mg 2+ or Ca 2+ ) co-doped β-NaYF 4 :Yb 3+ /Er 3+ upconversion microparticles (UCMPs) were synthesized via a facile hydrothermal method . The influences of co-doping ions and their concentrations on crystal structure, particle morphology and optical properties were thoroughly investigated by XRD , SEM , FT-IR spectra, UV–VIS-NIR absorption spectra and photoluminescence spectra. And the effects of the two kinds of impurity ions co-doping on the UC particle growth were studied. We found that luminescence quenching could be inhibited by using Cr 3+ and Mg 2+ co-doping due to the asymmetrical ion arrangement around activator. However, the Cr 3+ and Ca 2+ co-doping was found to quench the upconversion luminescence (UCL), and the possible mechanism was suggested. These discoveries lead to new insights into the quenching effect and new strategy to design UCMPs for better luminescence performance.
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OPTICAL MATERIALS
·
2019
·
IF 2.687
Huazhen Liao,Song Ye,Yanling Shi,Deping Wang
Small size optical-magnetic bifunctional upconversion nanoparticles (UCNPs) that can be effectively triggered by 808 nm exhibit distinct advantages of improved tissue penetrating depth, minimized overheating effect, possible for multimodal imaging and high clearance rate, which therefore are considered as desirable candidates for bioapplications. In this research, the 808 nm triggered sub-20 nm β-NaYF 4 :Yb 3+ /Er 3+ @NaGdF 4 :Yb 3+ /Nd 3+ @NaGdF 4 active-core@active-shell@inert-shell structured UCNPs with optical and magnetic bifunctional properties were developed by seed-mediated growth method with NaOA as sodium source instead of the generally used NaOH. Through optimizing Nd 3+ doping concentration and outermost NaGdF 4 inert-shell thickness, the optical-magnetic bifunctional core-shell-shell structured UCNPs exhibited strong UC emission intensity and improved magnetic property . Furthermore, the core-shell-shell NPs were validated to be no cytotoxicity by cell viability assessment. Therefore, this research may open a general avenue for the synthesis of small size multifunctional UCNPs for practical bioapplications without overheating.
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高影响因子
LANGMUIR
·
2013
·
IF 4.187
Ziyong Cheng,Ruitao Chai,Pingan Ma,Yunlu Dai,Xiaojiao Kang,Hongzhou Lian,Zhiyao Hou,Chunxia Li,Jun Lin
Bilayer thermosensitive P(NIPAm-co-AAm) hydrogel discs were prepared by a facile UV light initiation process from N-isopropylacrylamide (NIPAm) and acrylamide (AAm) monomers’ cross-linking copolymerization. Poly(ethylene glycol) (PEG) as a pore-forming agent was added in order to form a porous structure and improve the water content in the hydrogel. Functional materials of NaYF4:Yb3+/Er3+ nanoparticles and multiwalled carbon nanotubes (MWCNTs) were incorporated into different layers of the P(NIPAm-co-AAm) hydrogel for the purpose of up-conversion luminescence labeling and the NIR light antenna effect, respectively. Significantly improved drug release from composite hydrogels was achieved in response to 980 nm NIR light irradiation by using lysozyme as a macromolecular drug. The multifunctional hydrogel reported here provides a platform for simultaneous NIR luminescence labeling and NIR-driven drug release.
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高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Yujie Luo,Shiyu Zhou,Yaofang Sun,Deqiang Zhao,Xiaosong Gu,Qiutong Yan,Fangying Ji,Xuan Xu
To further enhance the photocatalytic performance of BiOCl, a facile hydrothermal reduction reaction was used to synthesize the reduced graphene oxide- (rGO-) modified ternary compound photocatalyst β-NaYF 4 :Yb 3+ , Er 3+ @BiOCl-rGO (NYF–Bi-rGO). rGO prepared using a hydrothermal method showed good conductivity . Furthermore, the specific surface area of NYF-Bi-rGO was 20-fold larger than that of NYF, which is a quality that could prove highly advantageous for use in pollutant adsorption. In addition, the ternary photocatalytic system produced by rGO increased the absorption intensity of NYF-Bi in the visible light region, and caused a red-shift of the entire absorption cross-section. In particular, analysis of carrier migration showed the introduction of rGO promoted the separation of the photoelectron-hole pairs of BiOCl, inhibited its recombination and improved the photocatalytic efficiency of the ternary photocatalyst NYF-Bi-rGO.
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