RSC Advances
·
2020
·Vol. 10
·期 31
·18054-18061
·
IF 3.119
Jing Chen,Hui-Hui Xiang,Zu-Zhi Zhao,Yun-Kai Wu,Meng-Yu Fei,Meng-Meng Song
An ultra-sensitive T2-weighted MR imaging contrast agent was prepared based on Fe3O4 nanoparticles and Gd3+ ions (Fe3O4@Gd). Amino modified Fe3O4 nanoparticles were conjugated to diethylenetriamine pentaacetic acid, and finally coordinated with Gd3+ ions. The nanoparticles had a uniform morphology with a size of 100 nm and a Gd/Fe mass ratio of 1/110. The r2 (transverse relaxivity) of the Fe3O4 nanoparticles increased from 131.89 mM−1 s−1 to 202.06 mM−1 s−1 after coordination with Gd3+ ions. MR measurements showed that the aqueous dispersion of Fe3O4@Gd nanoparticles had an obvious concentration-dependent negative contrast enhancement. Hepatoma cells were selected to test the cytotoxicity and MR imaging effect. The application of Fe3O4@Gd nanoparticles as contrast agents was also exploited in vivo for T2-weighted MR imaging of rat livers. All the results showed the effectiveness of the nanoparticles in MR diagnosis.
研究领域:
医学影像学
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纳米医学
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生物材料学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Caiyan YU,Tongtong XUAN,Sunqi LOU,Xiaoxiao LIU,Guohai LIAN,Huili LI
Recently, CuInS 2 /ZnS nanocrystals (CISZ NCs) have been widely used in many fields due to their excellent properties, such as tunable photoluminescence (PL) spectra, broad absorption, and non-toxicity. In order to expand the application of CISZ NCs, Gd 3+ was introduced into the host serving as paramagnetic modules to achieve magnetic resonance imaging (MRI) enhancement. MRI probes could provide high-resolution anatomical information. The derived Gd-Cu-In-S/ZnS nanocrystals (GCISZNCs) exhibited the strong orange photoluminescence with a quantum yield of 57.6% and significantly high longitudinal relaxivity ( r 1 =20.4 mmol/s) in comparison with commercial Magnevist (Gd-DTPA, r 1 =4.5 mmol/s). Effective enhancement of MRI and improved longitudinal relaxivity as well as lower cytotoxicity mode GCISZ NCs an ideal MRI probe, suggesting its potential and significance in practical biological and clinic applications in the future.
研究领域:
生物医学工程
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材料科学
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医学影像学
✓ 已验证
产品关联
DOI
高影响因子
Photonics Research
·
2021
·Vol. 9
·期 10
·1916-1923
·
IF 7.08
Qingyun He,Enrou Mei,Ze Wang,Xiaojuan Liang,Xiaojuan Liang,Suqin Chen,Suqin Chen,Weidong Xiang
Here, Gd-doped CsPbCl1.5Br1.5 nanocrystals (NCs) in borosilicate glass matrix (B2O3−SiO2−ZnO) were prepared by melting quenching and in-situ crystallization. The optical performance of CsPbCl1.5Br1.5 NCs glasses under different heat-treatment temperatures and the content of Gd3+ were analyzed in detail. After CsPbCl1.5Br1.5 NCs glass is doped with Gd3+ ions, the photoluminescence intensity increases and the synthesized Gd-doped CsPbCl1.5Br1.5 NCs glasses have excellent water stability and thermal cycling performance. In addition, the influence of Gd-doped concentrations and heat-treatment temperatures on the amplified spontaneous emission (ASE) thresholds of CsPbCl1.5Br1.5 NCs glasses was studied, and the Gd-doped CsPbCl1.5Br1.5 NCs glasses achieve controllable ASE thresholds at room temperature. The ASE threshold can be as low as 0.39 mJ/cm2. This work offers a neoteric reference for the research in the application of metal ion-doped perovskite NCs and a new idea for the realization of controllable and low ASE thresholds on perovskite NCs.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Jiacheng Gong,Wenqin Luo,Weirong Lan,Xi Chen,Haiyan Wu
Sr 3 LiSbO 6 phosphors were prepared by high temperature solid state reaction method. The crystal phase, morphology and optical properties were characterized by X-ray powder diffraction spectroscopy, scanning electronic microscope, absorption and photoluminescence (PL) spectra. The XRD Rietveld refinement was performed to obtain the detailed crystal structure of Sr 3 LiSbO 6 . The electronic structure was analyzed by density functional theory (DFT) calculation. Sr 3 LiSbO 6 possessed indirect band structure and the band-gap were determined to be 3.17 eV. Self-activated far-red emissions at 630–800 nm were detected under the excitation at 340 nm, which was proposed to originate from the transition between interstitial oxygen defective state to six hybrid 4d 10 5s 0 states of Sb 5+ according to the results of PL spectra of samples annealed at different atmospheres. The PL intensity can be significantly enhanced by 2.9 times after doping 2 mol% Gd 3+ ions in Sr 3 LiSbO 6 . The internal quantum efficiency of Sr 3 LiSbO 6 :2 mol%Gd 3+ was determined to be 25.2%. The influence of the Gd 3+ doping on the self-activated PL lifetimes of Sr 3 LiSbO 6 and the thermal quenching property of Sr 3 LiSbO 6 :2 mol%Gd 3+ was studied.
研究领域:
材料科学
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光学
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植物学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 5
·1085
·
IF 4.6
Dong Zhu,Chunfeng Wang,Xiaohuai Wang,Shun Han,Yuxiang Zeng,Ming Fang,Wenjun Liu,Deliang Zhu,Peijiang Cao,Youming Lu
The co-precipitation method was successfully used to synthesize Ba3(Y0.6−xGd0.4Eux)4O9(0.01 ≤ x ≤ 0.09) phosphors with heavy Gd3+doping, resulting in significantly enhanced thermal stability and luminescence performance. Structural analyses confirm that Gd3+and Eu3+ions substitute Y3+in the lattice, causing lattice expansion and improving crystal asymmetry, which enhances Eu3+emission. The incorporation of Gd3+creates efficient energy transfer pathways to Eu3+while suppressing non-radiative relaxation, leading to stable fluorescence lifetimes even at elevated temperatures. With a thermal activation energy of ~0.3051 eV, the Ba3(Y0.55Gd0.4Eu0.05)4O9phosphor exhibits superior resistance to thermal quenching compared to Ba3(Y0.95Eu0.05)4O9and many conventional red phosphors. Furthermore, the reduced color temperature and stable emission spectra across a wide temperature range highlight its potential for advanced lighting and display technologies in high-temperature environments.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 33
·期 31
·23880-23887
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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
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光学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Feihong Yang,Weiwei Li,Peng Luo,Jing Cheng,Laiming Chen
Transparent Yb:CaF 2 ceramics have recently emerged as a promising ultra-fast laser medium with broad emission bandwidth, long lifetime and suitable thermal properties. However, Yb 3+ clustering in the CaF 2 host strongly influences the performance of these materials as solid-state laser gain media, and mitigating this clustering remains a challenge. Herein, we introduced Y 3+ and Gd 3+ buffer ions simultaneously for the first time to modulate the fluorescence properties of transparent Yb:CaF 2 ceramics and explore the effect of Y 3+ and Gd 3+ ions co-doping on the optical quality and microstructure of the ceramics. It was found that transmittance in the short wavelength was improved and fluorescence properties could be modulated to a larger extent compared to single buffer ion doping. This finding establishes the correlation between the double buffer ions doping and the fluorescence properties in transparent Yb:CaF 2 ceramics, and may lead to innovative techniques of transmitting enhancement, as well as its ultrafast laser applications.
研究领域:
材料科学
·
光学材料
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固体激光器
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陶瓷材料
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光谱学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 32
·12321-12328
·
IF 4.097
Xiao-yan Kuang,Huan Liu,Wen-yong Hu,Yuan-zhi Shao
Multi-modal imaging based on multifunctional nanoparticles provides deep, non-invasive and highly sensitive imaging and is a promising alternative approach that can improve the sensitivity of early cancer diagnosis. In this study, two nanoparticles, TbPO4:Ce3+ and TbPO4:Ce3+@TbPO4:Gd3+, were synthesized via the citric-acid-mediated hydrothermal route, and then systematically characterized by means of microstructure, photoluminescence, magnetic resonance imaging (MRI), biocompatibility, and bioimaging. The results of energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS) line scans indicated that TbPO4:Gd3+ nanoshells about 5 nm in thickness were successfully coated on the TbPO4:Ce3+ nanocores. X-ray diffraction (XRD) and Fourier transforms of high-resolution transmission electron microscopy (TEM) images indicated that the core–shell nanocomposites had a single crystal structure. The photoluminescence of the TbPO4:Ce3+@TbPO4:Gd3+ and TbPO4:Ce3+ nanoparticles was greatly intensified by 200 times and 100 times, respectively, compared with pure TbPO4 nanoparticles. In vitro cytotoxicity tests based on the methyl thiazolyl tetrazolium (MTT) assay demonstrated that the monodispersed nanoparticles of TbPO4:Ce3+@TbPO4:Gd3+ had low toxicity. The intracellular luminescence of the nanoparticles after being internalized by HeLa cells was also observed using confocal fluorescence microscopes. MRI showed that the nanoshells of Gd-doped TbPO4 possessed a longitudinal relaxivity of 4.067 s−1 mM−1, which is comparable to that of the commercial MRI contrast Gd-TDPA. As a result, the core–shell structured TbPO4:Ce3+@TbPO4:Gd3+ nanoparticles can potentially serve as multifunctional nanoprobes for both optical biolabels and MRI contrast agents.
研究领域:
材料科学
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医学影像
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纳米生物学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 48
·17504-17510
·
IF 7.393
Bochao Sun,Yuqing Xie,Yunlong Zhao,Xiang Li,Junfeng Chen,Yushou Song,Lei Zhao,Zhigang Li,Hongtao Zhao,Jing Ren,Jianzhong Zhang
Transparent Ce3+-doped nano-glass composites (nano-GCs) embedded with pure and Gd3+-mixed KLaF4 nanocrystals (NCs) are prepared by a cost-effective and reproducible glass-making and thermal treatment method. The nano-GCs can be readily cast into various sizes and shapes. The growth of the Gd3+-mixed NCs and the enrichment of Ce3+ in the NCs are unambiguously revealed. Significantly enhanced emissions of Ce3+ with a photoluminescence quantum yield as high as 92.7% are observed in the nano-GCs embedded with the Gd3+-mixed NCs. The integral X-ray excited emission intensity of the nano-GC is 170% that of the Bi4Ge3O12 (BGO) single crystal. A light output of about 853 ± 8 ph per MeV with an energy resolution of 22.27% is obtained using the nano-GC for γ-ray (662 keV) detection. The Monte Carlo simulation is carried out to understand the differences in X- and γ-ray responses. As a proof-of-concept, a real-time remote X-ray fiber dosimeter is constructed using a scintillating fiber made out of the nano-GC, which shows an excellent linear response with the irradiation dose, good thermal stability and radiation hardness.
研究领域:
材料科学
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光学
·
核技术应用
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Yuguo Yang,Jing Li,Bing Liu,Yuanyuan Zhang,Xianshun Lv,Lei Wei,Xuping Wang,Jianhua Xu,Huajian Yu,Yanyan Hu,Huadi Zhang,Ling Ma,Jiyang Wang
A series of YAG:Ce 3+ /Eu 3+ , YAG:Ce 3+ /Eu 3+ /Bi 3+ and YAG:Ce 3+ /Gd 3+ phosphors were synthesized by a co-precipitation method. The results suggest that all of phosphors have the cubic phase and nearly spherical morphology. However, the red emission can be produced by codoping Eu 3+ and Eu 3+ /Bi 3+ ions in YAG:Ce 3+ , and the codoped Gd 3+ ions can induce the red-shift of Ce 3+ emission. These results suggest that the Eu 3+ , Eu 3+ /Bi 3+ and Gd 3+ ions can be used to decrease the correlated color temperature and increase the color-rendering index of white light-emitting diodes based on InGaN blue chip and YAG:Ce 3+ phosphors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yunfei Xie,Wangmei He,Fang Li,Thalagalage Shalika Harshani Perera,Lin Gan,Yingchao Han,Xinyu Wang,Shipu Li,Honglian Dai
Biocompatible, biodegradable, and luminescent nano material can be used as an alternative bioimaging agent for early cancer diagnosis, which is crucial to achieve successful treatment. Hydroxyapatite (HAP) nanocyrstals have good biocompatibility and biodegradability, and can be used as an excellent host for luminescent rare earth elements. In this study, based on the energy transfer from Gd3+ to Eu3+, the luminescence enhanced imaging agent of Eu/Gd codoping HAP (HAP:Eu/Gd) nanocrystals are obtained via coprecipitation with plate-like shape and no change in crystal phase composition. The luminescence can be much elevated (up to about 120%) with a nonlinear increase versus Gd doping content, which is due to the energy transfer (6PJ of Gd3+ → 5HJ of Eu3+) under 273 nm and the possible combination effect of the cooperative upconversion and the successive energy transfer under 394 nm, respectively. Results demonstrate that the biocompatible HAP:Eu/Gd nanocrystals can successfully perform cell labeling and in vivo imaging. The intracellular HAP:Eu/Gd nanocrystals display good biodegradability with a cumulative degradation of about 65% after 72 h. This biocompatible, biodegradable, and luminescence enhanced HAP:Eu/Gd nanocrystal has the potential to act as a fluorescent imaging agent in vitro and in vivo.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 1
·513-526
·
IF 4.186
Bingheng Sun,Benxue Jiang,Jintai Fan,Le Zhang,Long Zhang
Red-emitting color-convertors have attracted considerable attention for promising applications in solid-state lighting (SSL) to improve color rendition. However, the current nitride and fluoride phosphor powders have encountered several challenges, such as high cost, narrow emission bands, and insufficient stability during operation, which limit the development of high-power full-spectrum SSL. In this study, thermally robust Gd 3 (Al,Ga) 5 O 12 :Mn (GAGG:Mn) solid-solution ceramics (SSCs) with dual wavelength red-emission bands were prepared via an oxygen solid-state sintering reaction. The doped Mn ions occupied octahedral Al 3+ and Ga 3+ sites to generate Mn 4+ luminescent centers with pronounced deep-red emissions peaking at 698 nm ( 2 E → 4 A 2 ), and Mn 2+ luminescent centers with broad red emissions at 628 nm ( 4 T 1 → 6 A 1 ). Because the cationic radius matching effect induced the regulation of valence state of Mn, the photoluminescence of the GAGG:Mn SSCs can be tailored by the substitution of Al 3+ with Ga 3+ . Moreover, the Mn 3+ also existed in the GAGG lattice host, and their concentration decreased with increasing Ga 3+ contents owing to the mismatch of ionic radius between Mn 3+ and Ga 3+ ions. With the optimization of Al/Ga ratio and concentration of Mn ions, a broad emission band ranging from 550 to 800 nm (bandwidth = 250 nm) was achieved from Gd 3 Al 3 Ga 2 O 12 :0.3%Mn SSCs upon 465-nm excitation. Moreover, the GAGG:Mn SSC has over 17-fold enhanced thermal conductivity compared with the corresponding phosphor powder. This paper opens a door of regulating the valence state of luminescence centers with cation substitution and the application of oxide red-emitting color-convertors.
研究领域:
材料科学
·
光学工程
✓ 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）