JOURNAL OF NUCLEAR MATERIALS
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2017
·
IF 2.048
Yi Ding,Xinggui Long,Shuming Peng,Dong Zhang,Zhaoyi Tan,Xirui Lu
Zr 1− x − y Ce x Nd y O 2− y/ 2 ceramics, which were designed as waste form materials, were obtained by simultaneous substitution of Ce 4+ and Nd 3+ for Zr 4+ in ZrO 2 . The influences of the simultaneous substitution of Ce and Nd on phase transformation of ZrO 2 were investigated systematically. Also, the aqueous durability of the ceramics was evaluated. The results show that the phase transformation caused by the simultaneous substitution mainly relates to the total content of Ce and Nd. The ZrO 2 ceramics containing Ce + Nd < 30 mol% exhibit both monoclinic and cubic phases, while the ceramics containing Ce + Nd ≥ 30 mol% are cubic phase. And the cubic phase can be stabilized by incorporating 30 mol% Ce + Nd. Moreover, LR i are modified by the incorporation of Ce and Nd, because of the presence of oxygen vacancies . The Nd and Ce co-doped zirconia waste form exhibit excellent aqueous durability (∼10 −5 g m −2 d −1 ).
研究领域:
材料科学
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核废料管理
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陶瓷工程
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产品关联
DOI
高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
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2017
·Vol. 21
·期 10
·665-670
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IF 1.043
Jianyu Hua,Lixin Zang,Huimin Zhao,Ting Liu,Ming Fan,Tong Chen,Zhengyu Cao,Ye Tian,Zhiguo Zhang
This paper studies the origin of fluorescence emissions of metalloporphyrins. The absorption spectrum of neodymium-coordinated hematoporphyrin monomethyl ether (Nd-HMME) was found to have four Q bands, which is different from the accepted knowledge (two Q bands). The absorbance of Nd-HMME was comparable to the corresponding absorbance of HMME at wavelengths of 538 nm and 572 nm, but the absorbance of Nd-HMME at wavelengths of 502 nm and 622 nm was approximately 1/30 of that at 572 nm. The doping of Nd 3+ enhanced the symmetry of HMME, and led to changes in energy level properties. Moreover, Nd-HMME still exhibited two fluorescence peaks at 624 nm and 686 nm, similar to HMME, which can be explained by the observation of a weak absorption peak of Nd-HMME at 622 nm.
研究领域:
化学
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光谱学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2023
·Vol. 106
·期 7
·4116-4127
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IF 3.9
Shuangli Dong,Yanqi Jia,Yongbao Xiao,Qinyuan Zhang
Despite the significant technological applications of laser glasses, the quantitative prediction and optimization of their properties, particularly the spectroscopic properties, remain challenging. Here we address this problem by regarding the nearest-neighboring congruently melting compounds as the “component and structural motifs” based on the phase diagram approach. The composition–structure–property (CSP) relationships of Nd 3+ -doped ternary phosphate glasses are investigated. Spectroscopic properties are quantitatively predicted with an error of less than 10% compared to the experimental results. In particular, the fluorescence lifetime ( τ m ) can be accurately calculated using the phase diagram approach, which is difficult to be predicted previously. Furthermore, the CSP databases with over 1000 compositions are established for the optimization of commercial laser glasses. This study enriches the CSP database of traditional laser glass and provides guiding significance for future research.
研究领域:
材料科学
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光学
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化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2020
·Vol. 46
·期 10
·16524-16532
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IF 3.83
Muhammad Yousaf,Asma Noor,Shuai Xu,Majid Niaz Akhtar,Baoyuan Wang
Yttrium iron garnet (YIG) nanoparticles (NPs) doped with rare earth (RE) metal ions (Y 2.5 Sm 0.5 Fe 5 O 12 , Y 2.5 Nd 0.5 Fe 5 O 12 ) were successfully synthesized by sol-gel auto combustion approach. The cubic crystalline structure and morphology of the prepared garnet ferrite NPs were analyzed by X-ray diffractometer (XRD) and field emission scanning electron microscopy (FESEM). The cubic crystalline garnet phase of the synthesized YIG, Sm-YIG and Nd-YIG samples was successfully achieved at 950 °C sintering temperature . The force constant and absorption bands were estimated by using Fourier transform infrared spectroscopy (FTIR). The doping effect of RE metal ions on the chemical states of YIG were examined by x-ray photoelectron microscopy (XPS). The valence band (from 12.63 eV to 13.22 eV), conduction band (from 10.89 eV to 11.34 eV) edges and optical bandgap values of RE doped YIG samples were calculated using UV–Vis spectroscopy and ultraviolet photo electron spectroscopy (UPS). The magnetic analysis of the prepared NPs was studied using vibrating sample magnetometer (VSM). The XPS analysis of RE doped YIG samples exhibit the existence of RE (Sm +3 , Nd +3 ) contents on the surface of YIG ferrite by decreasing the oxygen lattice in garnet structure. The optical bandgap (from 1.74 eV to 1.88 eV) explains the semiconducting nature of the synthesized NPs. The UPS results confirm the valence band position of YIG doped samples. The saturation magnetization and remanence of RE doped garnet ferrite samples increased from 13.45 to 18.83 emu/g and 4.06–6.53 emu/g, respectively.
研究领域:
材料科学
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纳米科技
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固体物理
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无机化学
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功能材料
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DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2023
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IF 3.5
Y. Ji,C.Y. Shao,D.D. Chen,W.C. Wang
Laser glass has been widely used in laser ignition devices, fundamental physical research, and material processing. In addition to the exploration of the glass composition, the optimization of preparation conditions is also of crucial importance to the performance of laser glass. Herein, the modification effect of additional fluorine and sulfur agents on Nd 3+ -doped fluoro-sulfo-phosphate glasses (FSP) has been investigated in detail. The contents of F and S were increased by up to 42% and 40% after agent addition. Fluorine and sulfur agents also decrease the non-linear effect and increase the chemical durability of FSP glasses, respectively. Moreover, the local environment around Nd 3+ ions is examined by electron paramagnetic resonance (EPR)., The direct connection between Nd-F and the possible connection between Nd 3+ and [SO 4 ] 2− have been detected with agent addition, which facilitate the promotion of radiation parameters. The emission cross-section and quantum efficiency of FSP glass increase by up to 56% and 54% after agent addition. This study aims to demonstrate the structure and property variations brought by additional agents, providing insight into the optimization of the melting procedure of high-performance FSP laser glasses.
研究领域:
材料科学
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光学
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激光物理
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玻璃科学
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DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Jiang Zhao,He Liangrui,Yang Zhiwen,Qiu Huibin,Chen Xiaoyuan,Yu Xujiang,Li Wanwan
Distinctive upconversion or downshifting of lanthanide nanocrystals holds promise for biomedical and photonic applications. However, either process requires high-energy lasers at discrete wavelengths for excitation. Here we demonstrate that co-sensitization can break this limitation with ultrawide excitation bands. We achieve co-sensitization by employing Nd 3+ and Ho 3+ as the co-sensitizers with complementary absorptions from the ultraviolet to infrared region. Symmetric penta-layer core-shell nanostructure enables tunable fluorescence in the visible and the second near-infrared window when incorporating different activators (Er 3+ , Ho 3+ , Pr 3+ , and Tm 3+ ). Transient spectra confirm the directional energy transfer from sensitizers to activators through the bridge of Yb 3+ . We validate the features of the nanocrystals for low-powered white light-emitting diode-mediated whole-body angiography of mice with a signal-to-noise ratio of 12.3 and excitation-regulated encryption. This co-sensitization strategy paves a new way in lanthanide nanocrystals for multidirectional photon conversion manipulation and excitation-bandwidth-regulated fluorescence applications.
研究领域:
纳米技术
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生物光子学
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材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Zhou Mengwei,Huang Ping,Shang Xiaoying,Zhang Ruihuan,Zhang Wen,Shao Zhiqing,Zhang Shuo,Zheng Wei,Chen Xueyuan
Photon upconversion through lanthanide-doped nanoparticles is of great significance for various applications. However, the current development of upconversion nanoparticles is hindered by the low quantum efficiency and long radiative lifetimes of lanthanide ions, restricting their applications in time-dependent nanophotonics. Herein, we report ultrafast upconversion superfluorescence with a lifetime of sub-2.5 ns in lanthanide-doped nanoparticles at room temperature. Upon excitation with an 800-nm fs-pulsed laser, we achieve a large number ( N = 912) of correlated dipoles in Nd 3+ -concentrated nanoparticles, resulting in collective coherent emission with two orders of magnitude amplification in intensity and more than three orders of magnitude improvement in the radiative decay rate. Furthermore, we demonstrate that the control of excitation power and emitting sample length enables the lifetime manipulation of upconversion emission in a wide range from μs to sub-ns, accompanied by the typical superfluorescence signature of Burnham-Chiao ringing. These findings may benefit applications in many advanced technologies such as quantum counting and high-speed super-resolution bioimaging.
研究领域:
纳米技术
·
光子学
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材料科学
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光学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
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