JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 7
·4974-4985
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IF 4.186
Hang Liu,Xiaofeng Zhao,Yuancheng Teng,Yuxiang Li,Xiayu Zheng,Shanlin Wang,Lang Wu,Pritam Kumar Panda,Rajeev Ahuja
LnPO 4 · 0.667H 2 O rhabdophane has been considered as a potential material for the precipitation of actinides from radioactive waste liquid, owing to its outstanding characteristics of high actinide bearing and easy synthesis in acid solutions. However, a comprehensive understanding of the actinide occupation and the precipitation response of rhabdophane to remove actinides has yet to be established. In this study, the effect of ions concentration and pH values on the detailed precipitation reaction of Ce x Nd 1- x PO 4 · 0.667H 2 O rhabdophane in acid solutions are systematically investigated. Some specific issues such as structural distortion and flexibility, and occupation mechanism are discussed by combining with experiments and density functional theory (DFT) calculation. The results reveal that ions concentration and pH values have a significant impact on the crystallization nucleation step before 12 h. The obtained removal rate of Nd 3+ is more than 99% in pH 1–5 solutions with the ions concentration of 0.05–0.1 mol/L. Moreover, incorporating Nd in CePO 4 · 0.667H 2 O rhabdophane will easily result in the lattice distortion in b -axis. DFT calculation and X-ray photoelectron spectroscopy (XPS) results reveal that Nd is preferentially incorporated in nonhydrated site to form a weaker binding energy of NdO 8 polyhedron.
研究领域:
材料科学
·
核化学与放射化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2017
·
IF 2.109
Jiangyun Dai,Guoying Feng,Shutong Wang,Hong Zhang,Shengyu Dai,Shouhuan Zhou
By using femtosecond-pulsed laser to ablate the larger nanosized target in liquid, stable transparent NaGdF 4 :Nd 3+ colloid has been successfully fabricated. The X-ray diffraction (XRD) spectra reveal that the colloidal nanoparticles remain the hexagonal phase crystal structure of NaGdF 4 powder target. SEM and TEM images results indicate that the size of these colloidal nanoparticles decreases sharply. FT-IR results indicate that the number of O–H and C–H groups on the surface is decreased. The emission properties of the colloid have been investigated using 794 nm pulsed wave laser radiation , and it is found that the colloid exhibits near-infrared luminescent emissions in the spectral range of 850–1400 nm, and the decay time for 4 F 3/2 → 4 I 11/2 (1058 nm) Nd 3+ ion transitions is lengthened than that of powder target, these results are probably due to the reduced nonradiative relaxation assisted by high energy oscillators . The observed near-infrared emission of the stable transparent colloid makes it a good candidate for application in liquid laser .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guotao Xiang,Menglin Yang,Yongxi Ding,Hongxiu Wu,Lu Yao,Yongjie Wang,Xianju Zhou,Li Li,Li Ma,Xiaojun Wang,Jiahua Zhang
Accurate and real-time temperature detection is an urgent requirement in photothermal therapy (PTT). In this work, the CaSc 2 O 4 : Nd 3+ nanorod with an average length of 150 nm has been determined to be an outstanding optical thermometer based on the fluorescence intensity ratio ( FIR ) of thermally coupled Stark sublevels of Nd 3+ : 4 F 3/2 → 4 I 11/2 transition, of which the excitation and emission wavelength are located in the first and second biological window respectively, resulting in an 8 mm penetration depth in the biological tissues. The maximal absolute sensitivity and relative sensitivity as well as the minimal temperature resolution of the present sample is 0.0008 K -1 , 0.0018 K -1 and 0.19 K respectively, which is superior to the vast majority of the same type thermometers. Besides that, the nanorods show a 7 K temperature increment after 180 s’ 808 nm-laser radiation, revealing its photothermal conversion capacity thanks to the considerable nonradiative relaxation processes among the metastable energy levels of Nd 3+ . These results indicate that Nd 3+ single-doped CaSc 2 O 4 nanorods can be utilized as the optical thermometer in the deep-tissue PTT process for real-time thermometry along with the function of light-to-heat conversion.
研究领域:
生物医学工程
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材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhiwei Zhou,Bingchu Mei,Jinghong Song,Weiwei Li,Yu Yang,Guoqiang Yi
CaF 2 -SrF 2 hosts with substitution disorder of Ca 2+ /Sr 2+ sites in the lattice provide lower local symmetry for RE 3+ ions compared with pure CaF 2 or SrF 2 hosts, thereby facilitating more efficient 4f → 4f transitions. Here we report a study of effects of Sr 2+ content on microstructure and spectroscopic properties of Nd 3+ doped Ca 1-x Sr x F 2 transparent ceramic. Phase and microstructure analyses show that when x is in the range of 0–0.25, Nd: Ca 1-x Sr x F 2 nanoparticles keep pure CaF 2 phase with their size, morphology and agglomeration degree mildly changed. Increasing x from 0 to 0.2 significantly improves the luminescence intensity, emission lifetime and emission cross-section of Nd: Ca 1-x Sr x F 2 , however, hardly affects the concentration quenching. The luminescence intensities and emission lifetimes of x = 0.2 and 0.25 samples are very close, probably indicating SrF 2 phase has already formed in x = 0.25 sample. Based on the spectroscopic properties, the optimal Sr 2+ content is found to be x = 0.2.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2016
·
IF 2.437
Junyu Ren,Xuzhao Zhang,Xiaotong Zhang,Jiayi Guo,Rui Cheng,Shiyi Guo
In this letter, the Nd 3+ : Ca 3 NbGa 3 Si 2 O 14 single crystals with high doping concentration (2 at%) were grown using the Czochralski pulling method. For the first time, the dielectric, elastic and piezoelectric properties of Nd 3+ : CNGS crystals were evaluated at room temperature. The electro-elastic coefficients obtained for CNGS at room temperature crystals were given. It is proved that Nd 3+ : CNGS crystals have larger dielectric constants, piezoelectric constants and elastic compliance, as compared with those of CNGS crystals. Also, the new data were presented on the temperature dependence of electro-elastic properties from 25 °C to 900 °C. It is shown that Nd 3+ : CNGS crystals have a favorable temperature stability and high mechanical quality factor Q within the temperature range of 25–600 °C.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhousu Xu,Yijian Yang,Peng Wang,Xiaofeng Liu,Jianrong Qiu
Nd 3+ co-doped CsPbBr 3 perovskite quantum dots (PQDs) glasses were prepared by conventional melt-quenching followed by a thermal treatment process. With the introduction of Nd 2 O 3 to the parent glass, the optical properties of the CsPbBr 3 PQDs are significantly improved. The energy transfer from CsPbBr 3 PQDs to Nd 3+ ions was investigated and confirmed by excitation and emission spectra. The results show that visible excitation band width for the near-infrared (NIR) emission of Nd 3+ ions is significantly increased in the presence of PQDs. The strategy for modulation of the optical properties by the energy transfer between rare earth ions and PQDs in the glass matrix could be further utilized for spectral engineering of photonic glasses for optoelectronic applications.
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
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Huining Huang,Huiliang Li,Zeyan Wang,Peng Wang,Zhaoke Zheng,Yuanyuan Liu,Ying Dai,Yingjie Li,Baibiao Huang
In this work, we fabricated NaYF 4 :Yb 3+ ,Tm 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @TiO 2 (Tm@Nd@TiO 2 ) core@shell nanoparticles and investigated their near-infrared (NIR) photocatalytic activities. Comparing to traditional TiO 2 based upconversion (UC) photocatalysts (i.e., NaYF 4 :Yb 3+ ,Tm 3+ @TiO 2 , named Tm@TiO 2 ), Tm@Nd@TiO 2 exhibits enhanced photocatalytic activity under NIR light irradiation. The photocatalytic activity of Tm@Nd@TiO 2 under 980, 808, and 980 + 808 nm laser irradiation is 4.40, 5.84, and 9.83 times as high as that of Tm@TiO 2 under only 980 nm irradiation, respectively. The ethylene degradation rate of Tm@Nd@TiO 2 under 980 + 808 nm laser irradiation is 6.4 times as that of Tm@TiO 2 . The photocatalytic activity of Tm@Nd@TiO 2 under visible + NIR irradiation is even comparable with (∼2/3) that under UV light irradiation during Rhodamine B (RhB) degradation. The enhanced photocatalytic activity of Tm@Nd@TiO 2 can be attributed to the stronger light absorption in NIR region ascribed to Nd 3+ , lower water absorption and the enhanced UC emission of Tm@Nd with unique core@shell nanostructures. This work can provide a possible route to improve the NIR photocatalytic activity and stimulate the applications in many other fields.
研究领域:
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 13
·5109-5115
·
IF 8.067
Tao Pang,Yanyan Wu,Yujian Zhang,Ronghua Jian,Junwen Mao,Hong Wang,Hai Guo
Although much effort has been focused on thermally enhanced upconversion (UC) luminescence, it remains a challenge to maintain or even enhance the UC luminescence of NaLnF4-based phosphors (Ln = Y, Gd, Lu) using a surface-independent strategy. In this work, we demonstrate that the effect of temperature on UC luminescence in NaGdF4:Nd3+/Yb3+/Er3+ nanocrystals is strongly dependent on the exciting wavelength. When excited using 808 nm radiation, the UC luminescence exhibits good resistance to thermal quenching. The reason is that, in this situation, the negative effect of multi-phonon decay can be fully compensated by the thermal enhancement in the transition cross-section and in energy-transfer rate. Our research reports a novel strategy for the anti-thermal quenching of upconversion luminescence, which is potentially applicable in the design of dynamic UC anti-counterfeiting as well as in NIR-I-responsive thermometers and nanoheating.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Hang Liu,Haozhou Tian,Chunhui Sun,Qiang Wang,Hongqun Zhu,Xuezhong Yang,Haoran Wang,Yuhong Zhang
A series of Nd3+/Yb3+ co-doped Ca2LaTaO6 (CLTO) phosphors are synthesized by a high temperature solid phase method. Structural characterization confirms the successful incorporation of Nd3+ and Yb3+ ions into the CLTO host lattice. The photoluminescence excitation (PLE) spectra and photoluminescence (PL) spectra of CLTO:Nd3+ and CLTO:Nd3+/Yb3+ are investigated in detail. Under the excitation of ultraviolet (UV) and visible (VIS) light, the CLTO:Nd3+/Yb3+ phosphor emits broadband near infrared (NIR) luminescence. In particular, the luminescence intensity of the Yb3+ ion is increased through an energy transfer (ET) process from Nd3+ to Yb3+. The luminescence mechanism of the CLTO:Nd3+/Yb3+ sample is analyzed based on the decay lifetime and PL spectra. In addition, the NIR emission intensity of Yb3+ ions is also enhanced by doping K+ ions. The broadband luminescence (850–1050 nm) of the CLTO:Nd3+/Yb3+/K+ phosphor has good application in solar cells and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Materials
·
2019
·
IF 2.689
Wang Xin,Zhao Haiyan,Li Angzhen,Tian Ke,Brambilla Gilberto,Wang Pengfei
In this letter, an Nd3+-doped compound fluorosilicate glass was successfully fabricated with the method of melt-quenching. Under the excitation of a 808 nm laser, enhanced near-infrared photoluminescence emission at the range from 1,065 to 1,140 nm was observed in the glass sample. To characterize its stability and resistance to environmental effects, transmission spectra at the range of NIR-MIR were measured under different environments, including humidity and temperature. In addition, the obtained fluorosilicate glass was also developed as a microsphere resonator by using CO2 laser heating method. When the diameter of the microsphere was controlled at 61.5 μm, coupling with a tapered fiber, single-multimode lasing in the wavelength range λ1,056–1,071 nm was achieved with a low lasing threshold of 1.5 mW. Compared to silica and phosphate glasses, this fluorosilicate glasses have lower phonon energy, which can reduce the probability of non-radiative transitions and improve the photoluminescence efficiency. Therefore, using it as the raw material, the developed microsphere resonator offers a high transition temperature and with a low lasing threshold, which are promising it for high performance sensing and detection applications.
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
Materials Today Communications
·
2024
·
IF 3.7
Haoshan Wei,Zhongxin Huang,Jiewu Cui,Pengjie Zhang,Song Ma,Wei Sun,Xiaohui Liang,Yong Zhang,Yucheng Wu
M-type barium ferrites (Ba 1−x Nd x Fe 12−x M x O 19 , x = 0–0.3) with Nd 3+ –M 5+ (M = Nb 5+ and Ta 5+ ) ions substituting Ba 2+ and Fe 3+ ions were prepared via a solid-state reaction. The crystalline phases, microstructure, magnetic properties , and electromagnetic wave absorption of the ion-substituted M-type barium ferrites were investigated. The saturation magnetization strength and coercivity changed with increasing substitution ratio x. The substitution of Nd–Nb and Nd–Ta ions reduced the anisotropic field of the material, thus lowering the natural resonant frequency. The complex permittivity of the ion-substituted samples was enhanced compared with that of the unsubstituted samples. Interfacial polarization, dipole polarization and dipole relaxation were induced by the substituted ions. The multiple natural resonances contributed by the numerous g-factors generated by Fe 3+ ions and the exchange coupling among Fe 3+ , Fe 2+ , and O 2− ions controlled the permeability of M-type barium ferrite, which broadened the effective absorption bandwidth. The excellent complex permittivity and complex permeability enabled the substituted samples to attain high attenuation constants and better impedance-matching properties. Hence, a strong reflection loss of (−35)–(−50) dB, an ultrabroad bandwidth of ∼13.5 GHz, and a low matching thickness of < 0.75 mm were obtained in the frequency range of 26.5–40 GHz. The electromagnetic wave absorption was also improved in the frequency range of 2–18 GHz, where the samples with the substitution ratio of x = 0.1 exhibited relatively good performance with small matching thickness (<1.5 mm). Thereby, Nd–Nb and Nd–Ta substituted M-type barium ferrites are prospective candidates that can be used as an excellent microwave absorber material in the centimeter and millimeter wavelength frequency range.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 6
·8149-8156
·
IF 2.478
Yun Rui,Luo Li,He Jingqi,Wang Jiaxi,Li Xiaofen,Zhao Weiren,Nie Zhaogang
Lanthanide-doped system with adjustable multicolor and white up-conversion (UC) emission has been developed in GdVO 4 (GVO): Tm 3+ -Ho 3+ -Yb 3+ /-Nd 3+ phosphors, which are fabricated via a facile solid-state reaction. Herein, we study their phase structures and the Ho 3+ concentration effect on their up-conversion emission. Under 980 nm excitation, the Tm 3+ -Ho 3+ -Yb 3+ tri-doped GVO phosphors exhibit intense luminescence combined with red, green and blue (RGB) emission and the successive energy transfer between Tm 3+ -Ho 3+ -Yb 3+ ions causes a slight shift in the color coordinates of samples with different doping concentrations. Under 808 nm excitation, the color coordinate of the optimum GVO: Tm 3+ -Ho 3+ -Yb 3+ -Nd 3+ phosphor is located at (0.3277, 0.3433), which is closest to the ideal white light emission corresponding to (0.3333, 0.3333). Therefore, it is proved that these phosphors provide potential applications in the fields of displays, lasers and optical telecommunication.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）