Advanced Optical Materials
·
2019
·Vol. 8
·期 2
·1901209
·
IF 7.125
Xiao Chen,Weijing Yao,Qi Wang,Wei Wu
Owing to the large coding capacity and high confidentiality, dual-mode or multimode anticounterfeiting fluorescent materials are gradually substituting traditional single-mode fluorescent materials. Herein, a facile hydrothermal method is designed and used to integrate lanthanide ion (Ln 3+ )-doped NaLuF 4 nanoparticles with Y 2 O 3 -based downconversion nanorods, achieving the construction of dual-mode luminescent composite materials. The excellent optical properties of NaLuF 4 /Y 2 O 3 composites are confirmed by photoluminescence spectroscopy. The composites can be excited by a 980 nm laser to generate bright red, green, and blue colors (corresponding to Er 3+ /Tm 3+ -, Yb 3+ /Ho 3+ -, and Yb 3+ /Tm 3+ -doped NaLuF 4 , respectively), and turn into dim-red and green colors under an excitation source of 254 nm. Furthermore, the polyvinyl alcohol (PVA)-mediated stable fluorescent inks are successfully formulated and then printed onto the paper, aluminum foil, and fabric by low-cost and simple screen printing techniques to fabricate various anticounterfeiting patterns. Interestingly, the printed patterns are hard to observe under ambient light, enabling the generation of multiple emission color under excitations of 980 and 254 nm. The prepared dual-mode NaLuF 4 /Y 2 O 3 composite materials with outstanding stability and distinctive multicolor luminescent properties provide low-cost, highly effective, multilevel protection for genuine products against counterfeit.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Aihua Zhou,Feng Song,Weijing Yao,Yingdong Han,Feifei Song,Wei Wu,Chengguo Ming,Dandan Ju,Adnan Khan
The carbon-dots/NaLuF 4 microcrystals have been synthesized by the hydrothermal method and bright blue emission from carbon dots is observed in aqueous and solid state under 365 nm excitation. Self-quenching property of the carbon-dots/NaLuF 4 microcrystals under solid state was deeply investigated, by changing the ratio of citric acid (CA) and ethylenediamine (DHE). The results indicate that the carbon dots can be effectively adsorbed and dispersed on the surface of NaLuF 4 microcrystals, suppressing the aggregation of carbon dots. Furthermore, the upconversion luminescence can also be realized under 980 nm laser excitation. From the above observations, the carbon-dots/NaLuF 4 microcrystals not only reveal emission property of carbon dots and NaLuF 4 , respectively, but also optimize the property of carbon dots. It provides a promising new strategy to prevent the carbon dots quenching in solid state and the carbon-dots/NaLuF 4 microcrystals may have potential multi-applications in different fields including temperature sensing, solid-state display lighting as well as security inks.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3722-3725
·
IF 1.339
Song Weiye,Guo Xingyuan,He Guanghui,Qin Weiping
β-NaLuF4:20%Yb,0.5%Tm,x%Gd (x = 10,20, 30) nanocrystals were synthesized by high temperature thermal decomposition method. X-ray diffraction (XRD) show the as-prepared samples are characteristic of a pure β-NaLuF4. Transmission
electron microscope (TEM) investigations indicate the nanocrystals have particle size of ∼85 nm with good monodispersity and well-defined crystallographic facets. Particularly, under 980 nm excitation, upconversion (UC) emissions in the UV range of 270–320 nm were observed in these
nanocrystals, which further prove that β-NaLuF4 is an excellent host for building UV compact solid-state lasers or fiber lasers.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xiaolong Chen,Xiangyu Chen,Xuesong Zhai,Yin Li,Wei Zhao,Wu Sun,Qinfang Zhang,Jing Feng
Internal OH– defects always cause significant depletion of excitation energy for low upconversion efficiency; however, preventing the incorporation of OH– into the crystal lattice is very difficult during the synthesis of upconversion crystals. In this work, red upconversion emission is dramatically enhanced in Er3+-sensitized hexagonal NaLuF4 (β-NaLuF4) microcrystals through a collaborative effect of ion exchange and Tm3+ doping. The ion exchange can not only maintain the morphology very well but also strongly reduce the internal OH– defects, which can enhance the upconversion luminescence due to improved excitation energy harvesting and red to green (R/G) ratio due to intense cross-relaxation. Doping of Tm3+ as an energy trapping center not only regulates the red emission output but also reduces the excitation energy loss. β-NaLuF4:Er,Tm microcrystals after ion exchange exhibit stronger red upconversion emission compared with β-NaYF4:Er,Tm and β-NaGdF4:Er,Tm counterparts. Moreover, fluorescent labeling of the fingerprint pattern printed from β-NaLuF4:Er,Tm microcrystals with stable and intense red fluorescence has been demonstrated under 980 nm excitation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 13
·3974-3982
·
IF 7
Tianshe Yang,Luo Guo,Hao Wang,Xueli Xu,Peilin Wu,Ning Zhang,Xiangmei Liu,Shujuan Liu,Qiang Zhao
X-ray excited luminescence (XEL) of scintillators is significant for imaging applications in the fields of medical detection, information retrieval, and scientific research. In this case, lanthanide-doped rare-earth nanophosphors show potential as next-generation scintillators owing to their facile synthesis, high chemical stability and photostability, and adjustable XEL emission. In this study, a new type of XEL-enhanced NaLuF4-based nanophosphor was synthesized by doping Tb3+ to sensitize the emission of Eu3+, facilitating the application of the as-prepared nanoscintillators for X-ray imaging on opaque samples and biological specimens. NaLuF4:Gd/Tb/Eu with 5% Tb-doping showed the highest XEL intensity owing to the energy transfer process between Tb3+ and Eu3+. The NaLuF4:Gd/Tb/Eu (10/5/15 mol%) nanoparticles exhibited an excellent scintillation performance with a high light yield of 15 313 photons MeV−1 and low detection limit of 84.1 nGyair s−1. The X-ray imaging test using the NaLuF4:Gd/Tb/Eu (10/5/15 mol%)-based scintillation film exhibited a high spatial resolution of 8.7 lp mm−1. Furthermore, the NaLuF4:Gd/Tb/Eu (10/5/15 mol%)-based scintillation film was applied in X-ray imaging with high contrast for a spring sealed in a capsule and a crab.
研究领域:
材料科学
·
医学影像
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORINE CHEMISTRY
·
2024
·
IF 1.7
Shaohua Wu,Yu Yang,Shuang Wu,Yanhui Dong,Hao Cui,Daguang Li,Weiping Qin
NaLuF 4 :Yb 3+ ,Er 3+ micrometer prismatic crystals are potential materials for the preparation of optical waveguide devices. However, structural defects and OH – groups are generated inside and on their surfaces during growth processes. The structural defects and OH – groups lead to a large depletion of excitation energy and severely quench the downconversion luminescence of Er 3+ . In addition, the Yb 3+ /Er 3+ co-doping ratio significantly affects the downconversion luminescence of the microcrystals, which in turn affects the performance of the optical waveguide amplifiers based on the microcrystals. By adjusting the co-doping ratio of Yb 3+ and Er 3+ in the microcrystals and removing the defects in the crystals, their downconversion luminescence performance was significantly improved. The results showed that the downconversion luminescence under the excitation from a 980 nm laser reached the maximum value when the doping ratio of Yb 3+ and Er 3+ was 20:1.5. In addition, the OH – groups and structural defects in the micrometer crystals were significantly eliminated by ion-exchange and high-temperature annealing treatments, and the crystalline quality was significantly improved. After ion-exchange and high-temperature annealing treatments, the downconversion luminescence enhancement of NaLuF 4 :Yb 3+ ,Er 3+ microcrystals was 2.5 times that of the untreated samples.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Xuesong Zhai,Yin Li,Wei Zhao,Wu Sun,Meng He,Jing Feng
In this work, monodisperse β-NaLuF 4 :Yb,Er microcrystals with intense upconversion emission were synthesized via a modified hydrothermal method . With the increase of reactant concentration, their production yield is increased obviously, and the upconversion emission intensity in β-NaLuF 4 :Yb,Er microcrystals is also enhanced significantly. The luminescence enhancement should be attributed to minimal internal OH − defects, validated by a combination of analytical X-ray diffraction (XRD), energy dispersive spectrum (EDS), and Eu 3+ structural probe measurements. We also reveal that high Na + :RE 3+ ratio in the β-NaLuF 4 :Yb,Er microcrystals prepared under Na + -rich reaction will arouse the increased repulsive energy of β-NaLuF 4 microcrystals between F − and OH − anions and then facilitate the substitution of large OH − ions by small F − ions under F − -rich reaction conditions. Minimal OH − concentrations can limit nonradiative relaxation and promote excitation energy harvesting for high upconversion efficiency. The presented results not only offer a facile method for the simultaneous production yield and luminescence intensity increase of β-NaREF 4 microcrystals, but also uncover a better insight into the upconversion emission alterations, which is favorable to broaden their practical applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 42
·17861-17870
·
IF 7.394
Zhuo Wang,Peng Zhang,Qinghai Yuan,Xia Xu,Pengpeng Lei,Xiuling Liu,Yue Su,Lile Dong,Jing Feng,Hongjie Zhang
In this paper, intense up- and down-conversion luminescence were successfully achieved in well designed and synthesized core–shell structured NaLuF4:Gd/Yb/Er@NaLuF4:Yb@NaLuF4:Nd/Yb@NaLuF4 nanoparticles (NPs) simultaneously under 808 nm continuous-wave laser excitation. The morphologies, luminescent properties and energy transfer mechanism of the nanoparticles were studied in detail. By employing this design, multimodal imaging performance including near-infrared down-conversion optical imaging and X-ray computed tomography (CT) imaging were realized in one kind of NPs. Furthermore, the 808 nm excited optical temperature sensing property of the synthesized NPs was realized in a wide temperature range by monitoring the intensities of up- and down-conversion luminescence. This study provides a novel platform based on lanthanide fluoride nanoparticles for multifunctional imaging and temperature sensing in one system.
研究领域:
生物医学工程
·
纳米医学
·
光学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 33
·期 31
·23880-23887
·
IF 2.478
Ding Yanli,Zhang Xiaodan,Zhao Ying
The use of upconversion (UC) materials is an effective strategy for harvesting the near-infrared (NIR) solar photons in perovskite solar cells. Hexagonal β-NaLuF 4 :Yb,Er submicron prisms were synthesized by a facile solvothermal method. Gd 3+ doping is used to enhance the UC emission intensity. We investigated how the concentration of Gd 3+ ions affected the morphological evolution, microstructure, and luminescence performance of NaLuF 4 :Yb,Er and explored the mechanism for improving luminescence at 980 nm excitation. By incorporating the optimized NaLuF 4 :Yb,Er,Gd into the perovskite solar cells’ (PSCs) hole transport layer, the short-circuit density ( J sc ) of UC-PSCs can be enhanced from 19.31 to 21.77 mA cm −2 .
研究领域:
材料科学
·
光学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF TOXICOLOGICAL SCIENCES
·
2019
·
IF 1.732
Yuan Chen,Xiaoxiao Fei,Chenqiao Ye,Qinqing Qian,Zhiqiu Ye,Siqi Xie,Jiamin Chen,Mingliao Zhu,Na Ran,Mingsheng Hou,Lin Xu,Zhangsen Yu
In the past few decades, upconversion nanoparticles (abbreviated as UCNPs) have been more widely applied in the biomedical fields, such as in vitro and in vivo upconversion fluorescent bioimaging, photodynamic therapy, biological macromolecular detection, imaging mediated drug delivery and so on. But meanwhile, there is still not much research on the acute toxicity of upconversion nanoparticles in vivo, such as acute hepatotoxicity. In this work, we studied the in vivo biodistribution and acute hepatotoxicity of multimodal targeted contrast agent NaLuF4:Gd,Yb,Er-PEG/PEI-FA nanoprobe, which were synthesized by the solvothermal method and modified with Polyethylene glycol (PEG), Polyetherimide (PEI), folic acid (FA) on the surface. The acute hepatotoxicity in mice was systematically assessed after tail vein injection of different concentration of UCNPs. The results showed that NaLuF4:Gd,Yb,Er-PEG/PEI-FA nanoparticles with an average diameter of 44.5 ± 10.4 nm, and three typical upconversion fluorescence emission bands at 520 nm, 540 nm and 660 nm under the excitation of 980 nm laser. In vivo distribution experiments results demonstrated that approximately 87% of UCNPs injected through the tail vein accumulate in the liver. In the acute hepatotoxicity test, the intravenously injection dose of UCNPs was 10, 40, 70 and 100 mg/kg, respectively. The body weight, blood routine, serum biochemistry, histomorphology and liver oxidative stress were detected and observed no significant acute hepatotoxicity damage under the injection dose of 100 mg/kg. In conclusion, NaLuF4:Gd,Yb,Er-PEG/PEI-FA nanoprobes are safe and reliable, and have potential applications in the field of tumor targeted multimodal imaging.
研究领域:
生物医学工程
·
毒理学
·
纳米技术
·
分子影像
✓ 已验证
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 8
·1359-1367
·
IF 3.117
Qinqin Shao,Chao Yang,Xiaoxu Chen,Hong Zhang,Guoying Feng,Shouhuan Zhou
Lanthanide doped hexagonal phase (β) rare earth fluoride (NaREF4) nanocrystals have considerable potential in laser and, especially, biological applications. However, their large size and extreme synthetic conditions have become unavoidable obstacles in their path to various applications. Herein, a core-mediated hetero-shell growth method was adopted to synthesize α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals, in which cubic phase (α) NaGdF4 was used as the core to induce the subsequent growth of a β-NaLuF4:Nd3+ shell via a two-step solvothermal reaction. The resulting α-NaGdF4@β-NaLuF4:Nd3+ core–shell nanocrystals were characterized by structural analysis, photoluminescence spectroscopy and decay lifetime. Besides, a persuasive lattice-disordered heterointerface-induced mechanism was proposed to understand the core-mediated hetero-shell growth. Meanwhile, the influence of the heterointerface on the dynamic growth of the shell nanocrystals was also investigated in detail. Most importantly, the near-infrared luminescence intensity at 1.06 μm was enhanced by over two times via coating the lattice-matched homogeneous NaLuF4 shell on the surface of α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals. The high-performance α-NaGdF4@β-NaLuF4:Nd3+ nanocrystals thus obtained are expected to be used for laser output and depth detection of biological tissues.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yangqing Wu,Mei Wang,Shaolian Sun,Shan Shao,Ziyu Pan,Jinkai Li,Haoming Wei,Bingqiang Cao
X-ray excitation photodynamic therapy is a new photodynamic therapy mode that induces tumor cell apoptosis by indirectly stimulating photosensitizer on nanoparticles with X-ray as excitation light source and generating singlet oxygen. It solves the problem of light penetration in traditional photodynamic therapy and realizes the treatment of deep tumors. At present, the weak X-ray-induced luminescence restricts further development of X-ray photodynamic therapy. NaLuF 4 :Li + /Gd 3+ /Tb 3+ rare-earth nanoparticles with uniform size and regular morphology were synthesized by solvothermal method . The X-ray-induced luminescence intensity of NaLuF 4 :Li + /Gd 3+ /Tb 3+ NPs was improved by Li + and Gd 3+ ions co-doping. The light yield of NaLuF 4 :Li + /Gd 3+ /Tb 3+ NPs with 5% Li + ions doping was 1.4 times than that of reference sample due to the change of crystal field symmetry. Furthermore, the effective lifetime of persistent luminescence increased from 221.5 s to 251.9 s after 15% Li + ions doping. The thermoluminescence curves confirmed that the trap concentration was increased after Li + ions doping, which was responsible for enhancing persistent luminescence lifetime . Long persistent luminescence emission laid a foundation for further application in photodynamic therapy.
研究领域:
材料科学
·
医学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）