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稀土学报（英文版）
稀土学报（英文版）

徐光宪

月刊

1002-0721

jrechina@263.net xtxb@grinm.com

010-62014832

100088

北京新街口外大街2号中国稀土学报编辑部

稀土学报（英文版）/Journal Journal of Rare EarthsCSCDCSTPCD北大核心EISCI
查看更多>>本学报是由中国稀土学会主办、北京有色金属研究总院承办、北京大学协办的综合性学术刊物。它涉及的主要内容有稀土化学与湿法冶金；稀土金属学与湿法冶金；稀土新材料（磁性材料、超导材料、纳米材料等）；稀土固体物理与固体化学；稀土应用研究；稀土分析检测；稀土地质、矿物和选矿等。主要栏目有综合评述、学术论文、研究快报及研究简报等。
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    Synthesis and applications of lanthanoid complexes of pentadentate and hexadentate N5 and N6 macrocycles:A review

    Julio Corredoira-VázquezCristina González-BarreiraPaula Oreiro-MartínezAna M.García-Deibe...
    1-15页
    查看更多>>摘要：In this paper,the lanthanoid complexes of N5 and N6 macrocycle ligands,without pendant arms or additional heteroatoms,are surveyed.This review covers the period from 2015 to the current date,since in 2014 Schiff base macrocyclic ligands incorporating the pyridine moiety,and their complexes,were revised,and in 2015 the chemistry of pentaaza macrocycle ligands with rare earth metals was also summarized.Porphyrin and phthalocyanine ligands are not included in this review,which primarily focuses on complexes with Schiff bases and amines without pendant arms or any additional donor other than nitrogen.The synthetic methods,structural characterization,based on single X-ray crystal data,and properties of the lanthanoid complexes,with special attention to magneto-structural correlations,are presented herein.
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    Photonic properties and applications of multi-functional organo-lanthanide complexes:Recent advances

    VirenderArchana ChauhanAshwani KumarGurjaspreet Singh...
    16-27页
    查看更多>>摘要：Lanthanides(Ln(Ⅲ))based compounds as light-emitting materials have emerged as successful agents in high-performance defense and lighting systems,magnets,bio-markers,and circuitry.Therefore,they have recently gained much attention as energy-saving and cost-effective luminescent materials and their applications in analyte detection.The present review summarizes powerful features and recent de-velopments of organo-lanthanide complexes in lighting applications with a particular focus on visible light emitters,including Eu(Ⅲ),Tb(Ⅲ),Sm(Ⅲ),and Dy(Ⅲ)ions.In addition,this review discusses the most relevant aspects of photosensitization,such as the structure,property,functionalization of primary and secondary ligands,and molecular geometry.In addition,coordination sites of organo-lanthanide complexes and their applications collectively contribute to the improved performance of innovative luminescent materials.Finally,the current challenges and key recommendations for advancing organo-lanthanides in material science are provided.
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    X-ray excited Mn2+-doped persistent luminescence materials with biological window emission for in vivo bioimaging

    Hanrun ZhengLin LiuYi'ang LiRui Rong...
    28-35页
    查看更多>>摘要：In recent years,persistent luminescence materials(PLMs)excited by X-rays and emitting in biological windows have received extensive attention in the field of high-sensitivity bioimaging.Transition metal Mn2+is an ideal emission center,but few studies focus on Mn2+-doped PLMs with X-ray excitation and biological window emission.Here,we report a Mn2+-doped PLM,LiYGeO4:Mn2+(LYGM),with excellent biological window persistent luminescence emission.After excitation by UV,LYGM produces a durable biological window of persistent luminescence emission at 660 nm for up to 20 h.More importantly,LYGM can be repeatedly excited by X-rays,resulting in long-term biological window persistent lumi-nescence emission.In addition,we obtain LYGM around 200 nm in diameter by ball milling and centrifugation and improve its biocompatibility by surface modification to apply it to in vivo imaging in mice.After LYGM are injected into mice through the tail vein,in situ excitation of X-rays can be achieved.After the persistent luminescence decays,LYGM can be re-excited for repeated imaging.Therefore,LYGM shows potential prospects for in vivo deep tissue and long-term bioimaging.
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    One-step hydrothermal synthesis of Cit-NaYbF4∶Er3+nanocrystals with enhanced red upconversion emission for in vivo fluorescence molecular tomography

    Xiaoli LuoQichen ChenHongbo GuoHeng Zhang...
    36-45页
    查看更多>>摘要：Fluorescence imaging techniques represent essential tools in in vitro,preclinical,and clinical studies.In this study,an improved one-step hydrothermal method to synthesize citric acid(CA)modified α-NaYbF4∶2％Er3+nanocrystals was proposed.The introduction of various doping ions into NaYbF4∶2％Er3+and the different valence states of the same ions affect both the crystal size and upconversion lumi-nescence.Therefore,we investigated the upconversion luminescence enhancement of NaYbF4∶2％Er3+by ion doping and find that the upconversion luminescence intensity of the upconversion nanoparticles(UCNPs)co-doped with 5 mol％Fe2+ions shows the greatest enhancement,especially for red emission at 654 nm.Furthermore,HeLa cells incubated with UCNPs allow for imaging with strong red upconversion emission detection.Confocal laser scanning microscope(CLSM)fluorescent images of HeLa cells indicate that NaYbF4∶2％Er/5％Fe2+leads to a clear outline and improves visualization of the cell morphology.In addition,the CA coated NaYbF4∶2％Er3+/5％Fe2+nanoparticles and NaYbF4∶2％Er3+/5％Fe2+show low cytotoxicity in HeLa cells.Organ imaging reveals the efficiency of these UCNPs to analyze the lungs,liver,and spleen.Together,these results indicate that the Cit-NaYbF4:2％Er3+/5％Fe2+UCNPs are efficient nanoprobes for fluorescence molecular tomography.
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    Cool white light and tunable multicolor emission from Tb3+/Dy3+co-activated glasses under different excitations for WLEDs

    L.VijayalakshmiK.Naveen KumarJong Dae Baek
    46-56页
    查看更多>>摘要：A set of co-doped(Tb3+/Dy3+)lithium zinc borate(LZB)glasses were developed by melt quenching.The structural evaluation was performed for synthesized glassy matrices.The Dy3+and Tb3+individually doped glasses exhibit intense yellow and green luminescence bands at 575 nm(4F9/2 → 6H13/2)and 543 nm(5D4→7F5),respectively.The sensitization effect of Dy3+on Tb3+was analyzed by increasing the Tb3+content with respect to the optimum Dy3+content(0.5 mol％)in Dy3+/Tb3+.The spectral overlay of Dy3+luminescence and Tb3+absorption profiles,Dy3+/Tb3+PL spectra under different excitations 352,362,376,and 385 nm,shortening decay lifetimes of Dy3+in Dy3+/Tb3+co-activated glasses,energy transfer(ET)parameters,chromaticity coordinates and their corresponding correlated temperatures all help to explain ET from Dy3+to Tb3+.At 385 nm of Dy3+excitation,the optimized co-activated(0.5Dy3++1.0Tb3+):LZB glass displays cool white light emission.The non-radiative ET from Dy3+to Tb3+is dominated by electric dipole-dipole interaction and its ET efficiency was calculated to be 63％.At the same time,reverse ET from Tb3+to Dy3+was also analyzed.The shift in color coordinates from dominant yellow to greenish-yellow,green and white light emission suggests that Dy3+/Tb3+co-activated LZB glasses can be a potential candidate for UV converted multicolor and white light emit-ting devices.
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    Emission colour tuning in KLnF4∶Yb3+,Er3+/Ho3+phosphor

    Janani KGayathri EVijayatha VRamasubramanian S...
    57-65页
    查看更多>>摘要：KLnF4∶Yb3+,Er3+/Ho3+(Ln=Y,Yb,Gd)phosphors were prepared by solid-state reaction technique.For each of the Yb3+/Er3+and Yb3+/Ho3+co-doped phosphors independently,phase confirmation and morphological examination were accomplished using the X-ray diffraction technique and scanning electron microscope analysis.X-ray photoelectron spectroscopy analysis shows the charge state and existence of lanthanides and dopants.Upconversion luminescence emissions of green and red colour were detected for the synthesized phosphors.The changes in the upconverted emission intensities and colour output pertaining to the change of the lanthanide host matrix along with dopants were inves-tigated for the prepared phosphors.In the upconversion luminescence,erbium-doped samples exhibit a predominance of red emission while holmium-doped samples display a prevalence of green emission.The rare-earth Er/Ho doped KYbF4 shows strong red emission compared to other hosts.KYF4∶Yb,Er/Ho exhibits relatively significant green upconversion emissions,while Yb,Er-doped KGdF4 host displays a 10-fold increase in green/red emission ratio with an increase in the input power of 20-780 mW.Down-shifting photoluminescence studies and decay curve analysis were carried out using UV light excitation for the developed phosphors.A higher lifetime of 2.2 ms was measured for the downshifting red emission in the Ho doped KYbF4 sample.This study suggests a potential for colour tunability in the upconversion and downshifting emissions through host modifications to the fluoride phosphor.
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    Effect of Eu3+,Bi3+,and Li+doping on luminescent property of GdNbO4

    S.W.WiY.S.Lee
    66-75页
    查看更多>>摘要：We investigated the emission properties of Eu3+-doped GdNbO4-based oxide phosphors,aiming at improving the Eu3+emission by codoping of Bi3+and Li+.Eu3+singly doped,Eu3+and Bi3+doubly doped,and Eu3+,Bi3+,and Li+triply doped GdNbO4 were prepared using a high-temperature solid-state reaction method.The red-orange emissions from Eu3+in the singly doped samples are significantly improved by the codoping of Bi3+,mainly due to the energy transfer from Bi3+to Eu3+.The additional codoping of Li+is found to increase the Eu3+emission significantly.This improvement might be attributed to the increase in the photoluminescent quantum yield originating from larger grain sizes and better crystallinity.A detailed analysis of the X-ray diffraction pattern and the asymmetric ratio esti-mated from the photoluminescence spectra show that the local lattice environment around Eu3+in GdNbO4 does not change significantly with the codoping of Bi3+and Li+.Our results indicate that Li+doping is a promising way to improve the emission properties of rare-earth ion-doped GdNbO4 phosphors.
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    Fabrication of La,Ce co-doped ZnO nanorods for improving photodegradation of methylene blue

    Erfan Hakim Azmal ZaidJin-Chung SinSze-Mun LamAbdul Rahman Mohamed...
    76-83页
    查看更多>>摘要：La,Ce co-doped ZnO nanorods(ZnLC)were synthesized through a one-step solvothermal route.The photocatalysts were characterized by X-ray diffraction,Raman spectroscopy,field-emission scanning electron microscopy,energy dispersive X-ray,transmission electron microscopy,UV-vis diffuse reflec-tance spectroscopy and photoluminescence spectroscopy.The La and Ce doping enhanced the visible light absorption ability of ZnLC and a red shift was detected for ZnLC.Under simulated solar light irra-diation,the ZnO doped with 3 at％La and 1 at％Ce(ZnLC1)degrades methylene blue(MB)more effec-tively than those of pure ZnO,La-doped ZnO(ZnL)and commercially available ZnO.The improved photocatalytic performance of ZnLC1 can be attributed to the high charge separation efficiency as demonstrated by the photoluminescence spectra.Additionally,the photocatalytic experiments reveal that several parameters have their own impact on the MB degradation.Using a variety of radical scav-engers,it is discovered that superoxide anion radical plays a crucial role in the degradation of MB.The ZnLC1 is also reused several times without noticeable decrease of photoactivity,indicating that it has a substantial potential for environmental remediation applications.
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    Catalytic behavior of Mo-Bi-Fe-Co-K-M-O(M=Ce,Gd,CeGd)catalysts for selective oxidation of isobutene

    Qinghui LiHuahua ZhaoJian YangJun Zhao...
    84-93页
    查看更多>>摘要：The further improvement of methacrolein(MAL)selectivity from isobutene(IB)oxidation is crucial and challenging.In this study,based on the typical Mo-Bi-Fe-Co-K-O mixed metal oxide,the rare earth element Gd-doped,Ce-doped and CeGd co-doped catalysts were prepared by co-precipitation strategy to increase the selectivity of MAL from 47.9％to 49.8％,64.2％and 68.6％,respectively.In order to elucidate in-depth the promoting effect of Ce and/or Gd,various characterizations were utilized including X-ray diffraction patterns(XRD),Raman,X-ray fluorescence spectrometry(XRF),X-ray photoelectron spec-troscopy(XPS),O2-temperature programmed desorption(O2-TPD),H2-temperature programmed reduction(H2-TPR),CO2-temperature programmed desorption(CO2-TPD),IB-temperature programmed desorption(i-C4-TPD)and in-situ IB-Fourier transform infrared spectroscopy(IB-FTIR).Both Ce and Gd finely regulate the bulk and surface structure of the catalyst,thus altering the redox ability,oxygen mobility and storage ability and basicity.Compared with Ce,Gd addition slightly regulates the variation of Co2+/Co3+redox couples,greatly enhances the interaction among the components on the catalyst,thus only increases the content of surface oxygen species and has little effect on their mobility.While Ce-containing catalyst performs stronger oxygen storage and migration ability,thus leading to the over-production of surface Odefect species,which are proposed to be the active sites for the production of MAL and COx.The CeGd co-doped catalyst possesses the proper content of surface Odefect species,thus exhibits much higher MAL selectivity.Moreover,the promoting mechanism of Ce and/or Gd over IB oxidation is proposed.Therefore,this work is helpful for understanding the influence of rare earth elements on the structure of mixed metal oxides and the olefin selective oxidation reaction.
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    High catalytic performance of neodymium modified Co3O4 for toluene oxidation

    Yanqiong HuLuyue ZhangJianbei ZhangYongjun Liu...
    94-101页
    查看更多>>摘要：Co-based catalysts are the most promising catalysts in catalytic oxidation of volatile organic compounds(VOCs).Precious metal doping is adopted to improve the catalytic activity of toluene on Co3O4 catalysts,but greatly increases its cost along with it.It is found that doping a small amount of rare earth(Ce,Pr,Sm and Nd)can dramatically promote the catalytic activity of Co3O4.Especially,the Nd-doped Co3O4 catalyst exhibits excellent catalytic activity with a toluene removal rate of 90％at 162.1 ℃,which is even better than that of Pt-doped Co3O4.Compared with other rare earth metal doping,the Nd doping leads to a higher ratio of Co3+/Co2+and has more oxygen vacancies.The in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments show that the lattice oxygen of Nd-Co sample can be utilized at a quite low temperature,while that of pure Co3O4 cannot engage in oxidation reaction when the temperature is below 200 ℃,which visually demonstrates the main reason for the improved catalytic performance of Nd-Co catalyst.
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