Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 24
·7378-7385
·
IF 6.641
Leipeng Li,Feng Qin,Lu Li,Hong Gao,Zhiguo Zhang
Highly sensitive optical thermal sensing is achieved here based on the three-photon upconversion luminescence of Y2O3:Yb3+,Er3+ nano-thermometers. In the temperature range of 303–783 K, the 4G11/2 and 2H9/2 energy levels of Er3+ ion embedded in Y2O3 nanocrystals are found to be thermally linked. The 4G11/2–4I15/2 and 2H9/2–4I15/2 transitions’ intensity ratio thus satisfies the Boltzmann distribution. It is demonstrated that the relative sensitivity, on the basis of this ratio for temperature measurement, is as high as 2.05% K−1 at 303 K. It is, to the best of our knowledge, the maximum thermal sensitivity reported so far for the 4G11/2–4I15/2 and 2H9/2–4I15/2 transitions in various hosts. Moreover, this sensitivity is larger than all previously reported values that depend on the luminescence of the Er3+ ion. What's more, this value is also among the highest sensitivities achieved based on other thermally linked states of rare earth ions. As an added benefit, it has been shown that the single 2H9/2–4I15/2 transition can also be used for optical thermal sensing and its relative sensitivity is up to 1.27% K−1 at 783 K, which is 2.9 times the theoretical maximum sensitivity of ratiometric thermal detection based on the thermally linked states of rare earth ions.
研究领域:
材料科学
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光学传感
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纳米技术
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光子学
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稀土离子
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高影响因子
IET Nanobiotechnology
·
2020
·Vol. 14
·期 5
·347-356
·
IF 1.859
Mei Yang,Qingyuan Gui,Jinlei Ma,Lei Qi,Bijun Bao,Yida Huang
In this study, Gd 2 O 2 S:Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) upconversion nanotubes (UCNTs) were synthesised by using Gd(OH) 3 :Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) nanotubes as the template. The luminescent and biological properties of Gd 2 O 2 S:Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) UCNTs, along with photodynamic therapy (PDT) applications of the Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 (chlorin e6) nanocomposites, were systematically studied. The resultant UCNTs showed excellent biocompatibility with human retinal pigment cells (ARPE-19) even after a prolonged incubation time of 72 h, and could be used as luminescent probes. Microscopic imaging revealed that the UCNTs existed mainly in cytoplasm. PDT studies on the Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 nanocomposites indicate that the growth of the tumour (cell) could be inhibited dramatically when it was injected (incubated) with Gd 2 O 2 S:8%Yb 3+ , 2%Er 3+ UCNT–Ce6 nanocomposites under the irradiation of 980 nm laser.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Guangdong Wu,Juanqin Xue,Zhaoyuan Cao,Yanyan Zhou,Qiang Bi,Yan Zhao,Zhihua Leng
Constructing heterojunction photocatalysts that can make additional utilization of near-infrared (NIR) light has been a global scientific problem and has gained widespread research interest. Upconversion nanoparticles (UCNPs) collaborate with semiconductors to construct UCNPs-based photocatalysts that are used to improve solar energy utilization. In this work, the as-prepared UCNPs-based photocatalysts consisting of NaGdF 4 :Yb 3+ /Er 3+ (NGFYE) and bismuth oxyiodide (BOI) are synthesized by chemical epitaxial growth method and in-situ calcination process. The crystalline phase , morphology, optical and electrochemical properties of NGFYE@BOI samples are investigated in detail. Besides, Bi 4 O 5 I 2 /Bi 5 O 7 I Z-type heterojunction is confirmed by EPR test. Moreover, the photocatalytic elimination of tetracycline hydrochloride (TCH) and its photocatalytic mechanism by NGFYE@BOI samples are explored. This work may provide a promising idea for the efficient and controlled synthesis of UCNPs-based photocatalysts, which will contribute to the future utilization of solar energy.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Jinfeng Wang,Rui Jiang,Shuo Zhou,Bin Feng,PanPan Mou,Hongze Yang,Yanmei Zhang,Xianbo Zhang,Guosong Chen,Ying Hong
Using nitrilotriacetic acid (NTA) as the capping agent, β -NaYF 4 upconversion microcrystals (UCMCs) were successfully synthesized via a hydrothermal synthesis method. Systematic investigations were conducted to evaluate the influence of NTA/Ln molar ratio, NaF/Ln molar ratio, and pH on the morphology, size, and crystal phase characteristics of the UCMCs. Multiple characterization techniques, such as scanning electron microscope (SEM) and X-ray diffractometer (XRD), were employed to elucidate these effects. The experimental findings reveal that these parameters exert a substantial influence on the morphology and size of the UCMCs, with the crystal phase alterations primarily governed by variations in the NaF/Ln molar ratio. Furthermore, a comprehensive exploration of the growth mechanism of UCMCs was undertaken based on the modulation of reaction time. The emission spectra of the synthesized UCMCs were meticulously investigated, unveiling that microcrystals exhibiting larger size and enhanced crystallinity display more pronounced luminescent properties. Comparative analysis with UCMCs synthesized using ethylenediaminetetraacetic acid (EDTA) and sodium citrate (Na 3 Cit) as capping agents, which are extensively applied in diverse fields, demonstrated the superior luminescence properties of the newly obtained NTA-UCMCs. In addition, NTA-UCMCs were also employed for the fabrication of transparent and flexible fluorescent films. This research thus presents a novel approach for the synthesis of highly luminescent UCMCs, holding promise for various applications in practical contexts.
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高影响因子
JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Song LI,Song YE,Xiao CHEN,Tianhua LIU,Zhuang GUO,Deping WANG
Yb 3+ and Er 3+ ions co-doped NaYF 4 nanocrystals were synthesized with different amounts of NaOH via oleic acid (OA)-assisted hydrothermal process. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and photoluminescence spectra were used to characterize the products. The result indicated that the introduction of NaOH into the initial reaction solution effectively promoted the cubic (α-) to hexagonal (β-) phase transition of NaYF 4 :Yb 3+ ,Er 3+ nanocrystals, while excessive amount of NaOH favored the formation of α-NaYF 4 :Yb 3+ ,Er 3+ nanocrystals. Besides, with the increase of NaOH amount, the morphologies of β-NaYF 4 :Yb 3+ ,Er 3+ nanocrystals varied from irregular nanobranch to uniform nanorod. Further investigation revealed that the addition of NaOH could facilitate the deprotonation of OA, leading to the formation of oleate (OA − ), and meanwhile increased the concentration of OH − ions, inducing consequently the phase transition and morphology evolution of NaYF 4 :Yb 3+ ,Er 3+ nanocrystals. Moreover, the upconversion luminescence properties of NaYF 4 :Yb 3+ ,Er 3+ nanocrystals were systematically investigated. It was found that the upconversion emissions not only depended on the phase and morphology but also were influenced by the surface groups.
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高影响因子
Journal of Physical Chemistry C
·
2011
·
IF 4.524
Xiaojiao Kang,Ziyong Cheng,Chunxia Li,Dongmei Yang,Mengmeng Shang,Ping’an Ma,Guogang Li,Nian Liu,Jun Lin
Core–shell structured up-conversion luminescent and mesoporous NaYF4:Yb3+/Er3+@nSiO2@mSiO2 nanospheres were prepared by coating mesoporous SiO2 layers with different thicknesses on NaYF4:Yb3+/Er3+ nanoparticles via a simple two-step sol–gel process. The obtained sample shows a typical mesoporous structure and well-dispersed spherical morphology with a narrow size distribution. The nanospheres exhibit little cytotoxicity (via MTT assay), and ibuprofen (IBU) was used as a model drug to access the release properties of the system in detail. The amount of IBU adsorbed in mesoporous channels increases with the thickness of the ordered mesoporous silica shell coated on the NaYF4:Yb3+/Er3+ nanoparticles. The in vitro release study of IBU reveals a release profile in two steps: an initial diffusion-controlled release, followed by a slower release rate. Furthermore, upon excitation by a 980 nm near-infrared laser, the nanospheres emit green (2H11/2 and 4S3/2 → 4I15/2) and red (4F9/2 → 4I15/2) fluorescence of Er3+ even after the loading of IBU. Interestingly, the emission intensity of Er3+ in the bifunctional (mesoporous and luminescence) drug carrier increases with an increase of the cumulative released amount of the model drug (IBU). Thus, the extent of drug release can be easily identified, tracked, and monitored based on the change of the up-conversion luminescence. These results suggest that the core–shell structured NaYF4:Yb3+/Er3+@nSiO2@mSiO2 nanospheres are a promising material for controlled drug release.
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JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Xi Chen,Xiyong Chen,Hui Fu,Qiming Huang,Jialiang Jiang,Zhentao Du,Jialong Zhao,Weiyou Yang,Kanybek Osmonaliev,Samat Toktogonov,Jinju Zheng
Dual-band near-infrared (NIR) phosphors simultaneously covering the NIR-I (700-1000 nm) and NIR-II (1000-1700 nm) windows are highly desirable for practical optoelectronic devices, yet conventional rare-earth doped systems typically rely on ultraviolet sensitization. Herein, we report Yb 3+ /Er 3+ co-doped Cs 2 NaHoCl 6 double perovskite microcrystals (MCs) synthesized via a green aqueous-phase evaporation method, in which the intrinsic ∼450 nm absorption of Ho 3+ serves as a self-sensitizer, enabling competitive energy transfer from Ho 3+ to Yb 3+ and Er 3+ , predominantly via dipole-dipole interactions. This generates efficient dual-band emissions at 985 nm (NIR-I) and 1540 nm (NIR-II), with a high photoluminescence quantum yield (PLQY) of 85.6% under blue-light excitation, alongside excellent thermal stability and photostability. An NIR phosphor-converted light-emitting diode (pc-LED) fabricated with the optimized phosphor demonstrates practical utility in night vision, non-destructive detection, and high-contrast biological imaging. This work establishes an eco-friendly route for mass-producing efficient dual-band NIR emitters directly compatible with commercial blue LED chips.
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高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2023
·
IF 3.3
Bin Duan,Changchun Ding,Yuxiang Wu,Yongqiang Li,Wei Jin,Fengyi Wang,Junshan Hu
The present work investigates the near-single green emission properties of Ba 2+ doped Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ upconversion luminescence. The Ba 2+ doped Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ phosphors were successfully synthesized via the high-temperature solid-phase method. XRD pattern analysis showed that Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ was a single phase, and Ba 2+ doping did not induce heterophase phase. Under 980 nm near-infrared laser irradiation, Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphors emit strong green luminescence (530 nm, 2 H 11/2 → 4 I 15/2 , 557 nm, 4 S 3/2 → 4 I 15/2 ) and weak red luminescence (664 nm, 4 F 9/2 → 4 I 15/2 ). The upconversion green-red luminescence integral intensity ratio of Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphor is 32.1. This enhancement can be attributed to the presence of defect bands that facilitate excitation photon absorption and efficient energy transfer from abundant electrons into Yb 3+ ( 2 F 5/2 ) and Er 3+ ( 4 I 11/2 ) ions. More importantly, the maximum S A and S R of Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphor as a temperature sensor are 1.44 % K −1 (at 548 K) and 1.28 % K −1 (at 298 K), respectively.
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高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 20
·5453-5461
·
IF 5.976
Shaohua Fan,Guojun Gao,Shiyu Sun,Sijun Fan,Hongtao Sun,Lili Hu
Absolute quantum efficiency (QE) of up-conversion (UC) materials is still limited to ∼3%, which strongly limits their applications in many areas. Herein, we report highly efficient UC β-NaYF4:Yb3+,Er3+ micro-cylinders prepared via a newly developed Li+/Na+ ion exchange method (IEM) with absolute QE as high as ∼4.0%. A small amount of Li+ is interstitially incorporated in β-NaYF4:Yb3+,Er3+, which not only maintains well the micro-cylindrical morphology but also enhances the emission intensity by ∼40%, doubles absolute UCQE (∼3.0% under a fixed excitation power density of 15 W cm−2), and prolongs the lifetime. The UC excitation profile is composed of a sharp peak at 976 nm and a weak shoulder at 935 nm. The absolute UCQE of Li+/Na+ IEM β-NaYF4:Yb3+,Er3+ is systemically studied over a wide excitation power density of 0.4–100 W cm−2, and we obtained impressively high UCQE of 4.0% under 60 W cm−2 power density, which is among the highest values in the literature. The application of two green UC emissions of Li+/Na+ IEM β-NaYF4:Yb3+,Er3+ in ratiometric thermometers is successfully demonstrated. The high relative temperature sensitivity (SR) of 1113/T2 and excellent repeatability as indicated by three heating–cooling cycles (293–753 K) suggest their promising application as a temperature sensor.
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高影响因子
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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PubMed
高影响因子
EPL
·
2014
·Vol. 106
·期 4
·48001
·
IF 2.269
AiHua Li,Tengpeng Guan,Zhijun Sun
Upconversion nanophosphors (UCNPs) of lanthanide-doped efficient ternary fluoride (β-NaGdF4:Yb3+,Er3+) with sizes below 20 nm are synthesized in a facile solvothermal route. Upconversion luminescence (UCL) of the UCNPs is found to increase with increase of the nanoparticle size prepared at a higher solvothermal-treatment temperature, due to reduction of the surface defects. Interestingly, opposite size dependences of the red/green UCL intensity ratio are observed for the same series of UCNPs in different surface conditions, i.e., with increase of the nanoparticle size, the ratio decreases for as-prepared dry powders, but increases for moisturized counterparts after being exposed in air for some days, and interesting the ratio decreases again after annealing of the moisturized samples. The phenomenon is explained due to the effect of surface defects and adsorbed water molecules, respectively, dominating in nonradiative relaxations, which usually facilitate red UCL. The disclosed phenomenon clarifies some contradictory observations on UCL in the literature.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yuangong Ma,Wensheng Zhang,Zhifang Wu,Zhishan Liang,Youlin Huang,Qingmei Tan,Tianren Liu,Dongxue Han,Li Niu
In the realm of photocatalysis, effectively utilizing solar energy, especially the near-infrared (NIR) spectrum, presents substantial challenges. To tackle this issue, a novel composite of NaYF4:Yb3+/Er3+@Cu2O@MoS2@Fe3O4 (denoted as NYE@Cu2O@MoS2@Fe3O4) was ingeniously fabricated and assessed for the photodegradation of organic contaminants. By harnessing the distinct properties of upconversion materials, narrow bandgap semiconductors, and magnetic substances, the NYE@Cu2O@MoS2@Fe3O4 catalyst possesses a photodegradation rate of 92% for the rhodamine B dye under NIR light radiation, which is superior to NYE@Cu2O (50%) and NYE@Cu2O@MoS2 (85%). The enhanced performance in the near-infrared photocatalysis of NYE@Cu2O@MoS2@Fe3O4 is mainly attributed to the synergistic effect of various components, which promotes an increase in photo-induced carrier generation and facilitates their efficient transfer and energy utilization under NIR irradiation. This study provides a possible route for the near-infrared photocatalytic degradation of pollutants in areas with limited light or even dark conditions.
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高影响因子
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