JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Yue Wang,Yaomin Lei,Wuqin Chen,Ruian Yang,Xinyang Gu,Gaofeng Pan,Xuesong Zhai,Jinshan Wang
Luminescence quenching effect of lanthanide-doped upconversion materials occurs with high probability even in larger-sized particles, but their main quenching pathway remains controversial. In this work, we investigate the influence of the surfactant and pH value on the luminescence properties of β-NaLuF 4 :Yb,Er microcrystals. A convincing evidence can be provided by the combination of X-ray diffraction (XRD), inductively coupled plasma (ICP) spectrometer, and Eu 3+ structural probe measurements that the major quenching pathway comes from the fast energy migration from the excited lanthanides to nearby OH − defects in the crystal lattice rather than surface quenching effect. Even at OH − -rich reactant condition, the upconversion luminescence intensity becomes more efficient by reduced internal quenching effects. Our findings provide a new and fundamental understanding of severe luminescence quenching effect at microscale, thus guiding the design and preparation of highly efficient upconversion materials.
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高影响因子
INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Hao Lin,Dekang Xu,Yongjin Li,Lu Yao,Liqin Xu,Ying Ma,Shenghong Yang,Yueli Zhang
Luminescence efficiency of trivalent lanthanide-doped upconversion (UC) materials is significantly limited by luminescence concentration quenching. In this work, red UC emission is dramatically enhanced in Er3+-sensitized NaLuF4 UC crystals through energy trapping under multiple excitation wavelengths. Cross-relaxation quenching and the energy migration to internal lattice defects are simultaneously suppressed by confining the excitation energy in the Er3+ activator after introducing the Tm3+ or Ho3+ energy trapping center. The enhanced red UC emission (Er3+: 660 nm) mainly comes from the effective excitation energy confinement by Tm3+ and Ho3+ trapping centers through an easy energy transfer between Er3+ and Tm3+/Ho3+: 4I11/2 (Er3+) → 3H5 (Tm3+) → 4I13/2 (Er3+) and 4I11/2 (Er3+) → 5I6 (Ho3+) → 4I13/2 (Er3+). It is found that the confining efficiency of excitation energy in Er3+-sensitized NaLuF4 crystals is higher than that in Yb3+/Er3+ cosensitized NaLuF4 crystals, and the luminescence efficiency of Er3+-sensitized NaLuF4 crystals is much higher than that of Er3+-based host sensitization UC crystals (NaErF4). Moreover, Er3+-sensitized UC particles can be efficiently excited by three different wavelengths (808, 980, and 1532 nm), indicating huge advantages for applications in bioimaging, anticounterfeiting, and solar cells.
研究领域:
材料科学
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光子学
·
发光材料
·
光学工程
·
纳米技术
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高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Tianshe Yang,Peilin Wu,Ruifeng Chen,Jingfei Ni,Chao Xu,Xiangmei Liu,Shi Wang,Shujuan Liu
Scintillators are of significance for X-ray excited luminescence (XEL) imaging from scientific research to medical diagnostics application. Rare earth fluoride nanocrystals possess distinctive luminescent properties originated from the abundant energy level of lanthanide activators, showing potential applications as next-generation scintillators. Herein, high Z atomic rare earth element lutetium was chosen to synthesized NaLuF 4 -based nanoscintillators by Tb doping. Core-shell structure was fabricated to further enhance the XEL emission intensity. The NaLuF 4 -based nanoscintillators was demonstrated more efficient XEL emission with 3-folds increase compared to NaYF 4 nanocrystals. NaLuF 4 nanocrystals with a 25 mol% Tb doping and an inert shell coating exhibited excellent scintillation performance with detection limit as low as to 57.05 nGy air s −1 . X-ray imaging demonstrated a high spatial resolution of 10.5 lp mm −1 using a scintillator film made from as-prepared NaLuF 4 -based nanoscintillators. Finally, such NaLuF 4 -based scintillators film have been applied in X-ray imaging application for a chip and a biological specimen. This study proposed an effective strategy to enhance XEL for rare earth fluoride, providing the ability for high-quality X-ray imaging.
研究领域:
材料科学
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医学影像
·
纳米技术
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Shaolian Sun,Shan Shao,Wuyang Fan,Wenhu Zhang,Fan Xu,Haoming Wei,Bingqiang Cao,Yangqing Wu
The synthesis of efficient nano-scintillators is of great significance for the development of X-ray imaging and other applications. Here, X-ray excited afterglow rare earth nanoparticles β-NaLuF 4 :Gd 3+ /Tb 3+ are investigated. The X-ray-induced luminescence intensity and afterglow duration of NaLuF 4 :Gd 3+ /Tb 3+ nanoparticles are effectively improved by Ca 2+ doping. The optimal luminescence and afterglow performance are achieved when Ca 2+ doping ratio reaches 10%. The change of crystal field symmetry is the main reason for the improvement of luminescence performance. According to the thermoluminescence curve, it is proved that Ca 2+ doping increases the trap concentration and further enhances the afterglow. This study provides the research basis for the application of persistent luminescence materials in biomedical and other fields.
研究领域:
材料科学
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医学影像
·
生物医学工程
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1070-1076
·
IF 3.1
Liu Deye,Lu Yang,Li Xu,Liu Fengmin,Liu Xiaomin,Lu Geyu
I n this study, we synthesized a core-shell structure of up-conversion nanoparticles (UCNPs) and deposited it on the surface of fluorine-doped tin oxide (FTO). Subsequently, we assembled a series of perovskite solar cells with FTO/UCNPs/c-TiO 2 /mp-TiO 2 /MAPbI 3 /Spiro-OMeTAD/Au structures with an effective area of 0.04 cm 2 . To optimize the devices, we adjusted the concentration of UCNPs precursor. The optimized device showed a power conversion efficiency (PCE) of 16.73% and a short-circuit current density ( J sc ) of 26.94 mA/cm 2 at AM 1.5. These values are 9.20% and 10.47% higher than those of the best performing control device (15.32% for PCE and 24.12 mA/cm 2 for J sc ), respectively. Furthermore, we characterized the perovskite layer, charge transport layer, and perovskite solar cells using various analytical methods. The results showed that the addition of UCNPs not only improved the charge extraction and transfer, but also enhanced the stability of electron transport layer devices. In conclusion, our findings offer a process for optimizing perovskite cells using UCNPs and preliminarily analyzing their principles.
研究领域:
材料科学
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能源研究
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DOI
高影响因子
BIOMATERIALS
·
2013
·
IF 7.604
Juanjuan Peng,Yun Sun,Lingzhi Zhao,Yongquan Wu,Wei Feng,Yanhong Gao,Fuyou Li
Nanoparticles that circulate in the bloodstream for a prolonged period of time have important biomedicine applications. However, no example of lanthanide-based nanoparticles having a long-term circulation bloodstream has been reported to date. Herein, we report on difunctional radioactive and upconversion nanoparticles (UCNP) coated with polyphosphoric acid ligand, that is ethylenediamine tetramethylenephosphonic acid (EDTMP), for an application in single-photon emission computed tomography (SPECT) blood pool imaging. The structure, size and zeta-potential of the EDTMP-coated nanoparticles (EDTMP-UCNP) are verified using transmission electron microscopy and dynamic light scattering . Injection of radioisotope samarium-153-labeled EDTMP-UCNP (EDTMP-UCNP: 153 Sm) into mice reveal superior circulation time compared to control nanoparticles coated with citric acid (cit-UCNP: 153 Sm) and 153 Sm complex of EDTMP (EDTMP- 153 Sm). The mechanism for the extended circulation time may be attributed to the adhesion of EDTMP-UCNP on the membrane of red blood cells (RBCs). In vivo toxicity results show no toxicity of EDTMP-UCNP at the dose of 100 mg/kg, validating its safety as an agent for blood pool imaging. Our results provide a new strategy of nanoprobe for a long-term circulation bloodstream by introducing polyphosphoric acid as surface ligand.
研究领域:
生物医学工程
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放射医学
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纳米医学
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DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2013
·Vol. 8
·期 1
·1-8
·
IF 2.524
Zhou Na,Qiu Peiy,Wang Kan,Fu Hualin,Gao Guo,He Rong,Cui Daxiang
Water-soluble upconversion nanoparticles (UCNPs) were prepared by a one-pot procedure in a two-phase reacting system. Four kinds of surfactants were tested in the synthesis process as capping agent to tune size and morphology of nanocrystals. Nanoparticles (approximately 70 nm) and rods (400 nm and 2.5 μm) were synthesized, respectively. Then, Fourier transform infrared spectroscopy analysis confirmed the successful linking between UCNP surface and surfactant. Ionic liquids (ILs) and surfactants participated in synthesis process together, competing with each other to cap on UCNPs. ILs still led the competition of capping, while surfactants worked as cooperative assistants to develop functional surface. Further characterizations such as high-resolution transmission electron microscopy and X-ray diffraction indicated the changes in crystallization and phase transformation under the influence of surfactants. In addition, the growth mechanism of nanocrystals and upconversion fluorescence luminance was also investigated in detail. At last, the cytotoxicity of UCNPs was evaluated, which highly suggest that these surface-functionalized UCNPs are promising candidates for biomedical engineering.
研究领域:
材料科学
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生物医学工程
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纳米技术
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 41
·32891-32896
·
IF 3.84
Xinyuan Zhang,Kezhi Zheng,Chunyu Liu,Hao Li,Zhiqi Li,Jinfeng Li,Yeyuan He,Wenbin Guo,Liang Shen,Shengping Ruan
In this contribution, we study the effects of NaLuF4:Yb,Tm nanorods (NRs) dopant on the performance of inverted polymer bulk heterojunction (BHJ) solar cells. The study allows us to investigate the impact of NRs on the light-harvesting and photocurrent in BHJ solar cells fabricated with PCDTBT blended with [6,6]-phenyl-C71-butyric acid methylester (PC71BM) acceptor. By controlling the doping concentrations, we demonstrate that the power conversion efficiency (PCE) of PCDTBT:PC71BM solar cells increases from 6.02% to 7.18% mainly due to improving light absorption and photocurrent. The single carrier devices reveal that the electron and hole mobilities both rise in doped devices, contributing to the enhancement of photoconductivity and consequent PCEs.
研究领域:
光伏学
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纳米材料
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聚合物电子学
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太阳能转换
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Hao Lin,Dekang Xu,Yongjin Li,Lu Yao,Liqin Xu,Ying Ma,Shenghong Yang,Yueli Zhang
Lanthanide-doped upconversion (UC) materials are commonly excited by 700–1000 nm laser because of Yb 3+ (980 nm excitation) and Nd 3+ (808 nm excitation) are typically used as sensitizers. However, the excitation band located in the second near-infrared window (NIR-II, 1000–1700 nm) demonstrates the deeper penetration in biological tissue with minimum tissue scattering and autofluorescence. Herein, intense red UC emission in Er 3+ -sensitized NaLuF 4 particles under 1532 nm NIR-II excitation is presented. Red UC luminescence is significantly enhanced and purified through confining the 1532 nm excitation energy by Ho 3+ and Tm 3+ mediators, via an energy back transfer pathway (Er 3+ → Ho 3+ → Er 3+ and Er 3+ → Tm 3+ → Er 3+ ). Furthermore, when the particles injected into the fresh beef, red UC luminescence can be distinctly observed from the inside of beef under 1532 nm NIR-II excitation, implying the deep penetration of 1532 nm NIR-II excitation and 660 nm red UC emission. Our results suggest that bright red UC luminescence from Er 3+ -sensitized NaLuF 4 crystals with 1532 nm NIR-II excitation may be suitable for deep optical imaging .
研究领域:
材料科学
·
生物医学工程
·
光学成像
·
纳米医学
·
分子影像
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wei Zhou,Jian Yang,Xiangliang Jin
This paper reports on microcrystals with deep tissue penetration depth, strong red light emission, and thermometric function. The red light emission of NaLuF 4 :20 % Er 3+ /1 % Tm 3+ /10 % Yb 3+ microcrystals is exceptionally strong, thanks to the introduction of Tm 3+ and Yb 3+ ions energy capture centers. In bioimaging, the 1532 nm laser exhibits deeper imaging depth due to weak photon scattering and autofluorescence. Furthermore, red light emission has the greatest tissue penetration depth in the visible region. The luminescence intensity and tissue penetration depth of both the excitation and emission light make them suitable for deep tissue imaging. We investigated temperature sensing performance of NaLuF 4 :20 % Er 3+ /1 % Tm 3+ /10 % Yb 3+ microcrystals, and found that the maximum relative sensitivity of LIR (I 521 /I 540 ) reaches 0.92 %K −1 . The microcrystals NaLuF 4 :20 % Er 3+ /1 % Tm 3+ /10 % Yb 3+ are anticipated to have application in deep tissue imaging and temperature sensing.
研究领域:
材料科学
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生物医学工程
·
光学
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DOI
高影响因子
BIOMATERIALS
·
2019
·
IF 10.273
Zheng Liu,Feng Ren,Hao Zhang,Qiang Yuan,Zhilin Jiang,Hanghang Liu,Qiao Sun,Zhen Li
Rare-earth nanoparticles (RE NPs) with narrow long wavelength emissions have been recently investigated for their potential application for fluorescence imaging in the second near-infrared window (NIR-II). Previously these RE NPs have a very limited application in the diagnosis and treatment of deep-seated tumors such as brain tumors, due to their weak fluorescence in the range of 1300–1700 nm. Herein, we report a significant enhancement of more than 10 times regular emission of NaNdF 4 nanoparticles at 1340 nm wavelength by coating them with an inert layer of NaLuF 4 , followed by sensitizing with a near-infrared dye (IR-808). We deliver these highly bright nanoparticles into the brain by using focused ultrasound to temporarily open the blood-brain barrier (BBB), and then detect the orthotopic glioblastoma by fluorescence imaging at 1340 nm. The images obtained from long wavelength fluorescence ( i.e. 1340 nm) exhibited better resolution and contrast compared to the short wavelength fluorescence ( i.e. 1060 nm). Our study not only provides insights for enhancing often overlooked emissions of rare-earth nanoparticles for NIR-II fluorescence imaging of deep-seated tumors, but also demonstrates great potential of focused ultrasound based technology in delivering nanotheranostic agents.
研究领域:
纳米技术
·
生物医学工程
·
癌症研究
·
神经科学
·
光学成像
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yuzhu Dong,Tianyun Du,Mengyao Wang,Xiuxun Han
X-ray-excited persistent luminescence (XEPersL) of fluoride nanoparticles (NPs) is of great potential in X-ray excitation photodynamic treatment (X-PDT) and X-ray detection fields. However, their practical application is currently impeded by the hazard of X-rays with high dose rates to the human body and low luminescence efficiencies. Here, we reported a feasible strategy for modulating X-ray excited optical luminescence (XEOL) intensities and XEPersL lifetimes in NaLuF4:Tb3+ NPs through adjusting F/Re ratios, which were shown to effectively impact the generation of carrier traps. In addition to the enhanced emission intensity and prolonged decay time in the radioluminescence of NaLuF4:Tb3+ NPs with an optimal precursor F/Re ratio of 4.5, a quite low detection limit of 2.01 nGy·s–1 was achieved. Furthermore, the developed fluoride NPs exhibit remarkable luminescence stability. These findings can promote the further exploration of efficient XEPersL nanomaterials with tailored performance in X-PDT and biomedical applications.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
放射学
·
诊疗学
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DOI
高影响因子
危险品化学品经营许可证（带存储）