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Synthesis and optical properties of novel apatite-type NaCa_(3)Bi(PO_(4))_(3)F:Dy^(3+)yellow-emitting fluorophosphate phosphors for white LEDs

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Journal of Rare Earths 2022年第12期40卷 1827-1836,I0001页

作者： Yuan Wang Guangliang Lu Yang Qiu Wen Sun Siqi Qin Yifang Lin Bin Deng Dan zhang Ruijin Yu College of Science Northwest A&F UniversityYangling 712100China School of Chemistry and Environmental Science Xiangnan UniversityChenzhou 423043China Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application Xiangnan UniversityChenzhou 423043China College of Chemistry&Pharmacy Northwest A&F UniversityYangling 712100China Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichang 443002China

In this study,novel yellow-emitting fluorophosphate NaCa_(3)Bi(PO_(4))_(3)F phosphors doped with different concentrations of Dy^(3+)ions were first obtained via high-temperature solid-state *** crystal structure,phase purity,particle morphology,photoluminescence(PL)properties,thermal stability,and luminescence decay curves of the resulting phosphors were then characterized in *** the excitation of 349 nm,the three dominant peaks of the NaCa_(3)Bi(PO_(4))_(3)F:Dy^(3+)are centered at 480 nm(^(4)F_(9/2)-^(6)H_(15/2)),577 nm(^(4)F_(9/2)-^(6)H_(13/2)),and 662 nm(^(4)F_(9/2)-^(6)H_(11/2)).The optimal doping concentration of Dy^(3+)ions in the NaCa_(3)Bi(PO_(4))_(3)F:xDy^(3+)phosphors is x=5 mol%.The phosphors show excellent thermal stability with high activation energy(Ea=0.32 eV).Eventually,the synthesized white lightemitting diode(w-LED)demonstrates the Commission International de L’Eclairage(CIE)chromaticity coordinates of(0.341,0.334),a good correlated color temperature(CCT)of 5083 K,and a high color rendering index(Ra)of *** its potential as yellow-emitting phosphors,the feasibility of the fabricated apatite-type NaCa_(3)Bi(PO_(4))_(3)F:Dy^(3+)fluorophosphate phosphors was confirmed for wLEDs.

关键词： fluorophosphate NaCa_(3)Bi(PO_(4))_(3)F Dy^(3+) Luminescence Phosphor LEDs

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Nano self-assembly of fluorophosphate cathode induced by surface energy evolution towards high-rate and stable sodium-ion batteries

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Nano Research 2023年第1期16卷 439-448页

作者： Zhen-Yi Gu Yong-Li Heng Jin-Zhi Guo Jun-Ming Cao Xiao-Tong Wang Xin-Xin Zhao Zhong-Hui Sun Shuo-Hang Zheng Hao-Jie Liang Bo Li Xing-Long Wu MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityChangchun 130024China Department of Chemistry Northeast Normal UniversityChangchun 130024China Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Key Laboratory of Hazardous Chemicals Safety and Control Technology School of Chemical and Environmental EngineeringNorth China Institute of Science and TechnologyLangfang 065201China

In the field of materials science and engineering,controlling over shape and crystal orientation remains a tremendous ***,we realize a nano self-assembly morphology adjustment of Na3V2(PO4)2F3(NVPF)material,based on surface energy evolution by partially replacing V3+with aliovalent Mn2+.Crystal growth direction and surface energy evolution,main factors in inducing the nano self-assembly of NVPF with different shapes and sizes,are revealed by high-resolution transmission electron microscope combined with density functional ***,NVPF with a two-dimensional nanosheet structure(NVPF-NS)exhibits the best rate capability with 68 mAh·g−1 of specific capacity at an ultrahigh rate of 20 C and cycle stability with 80.7%of capacity retention over 1,000 cycles at 1 *** significantly,when matched with Se@reduced graphene oxide(rGO)anode,NVPF-NS//Se@rGO sodium-ion full cells display a remarkable long-term stability with a high capacity retention of 93.8%after 500 cycles at 0.5 C and−25°***,experimental and theoretical calculation results manifest that NVPF-NS demonstrates such superior performances,which can be mainly due to its inherent crystal structure and preferential orientation growth of{001}*** work will promise insights into developing novel architectural design strategies for high-performance cathode materials in advanced sodium-ion batteries.

关键词： nano self-assembly sodium-ion batteries cathode fluorophosphate

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Phase-pure Na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries

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Nano Research 2019年第4期12卷 911-917页

作者： Sohyun Park Jinju Song Seyeon Kim Balaji Sambandam Vinod Mathew Sungjin Kim Jeonggeun Jo Seokhun Kim Jaekook Kim Department of Materials Science and Engineering Chonnam National University 300 Ybngbong-dong Buk-gu Gwangju 500-757 Republic of Korea Gwangju Bio/Energy R&D Center Korea Institute of Energy Research (KIER) 270-25 Samso-ro Buk-gu Gwangju 61003 Republic of Korea

In this study,a pseudo-layered Na super-ionic conductor of Na3V2(PO4)2F3 (NVPF)/C cathode for sodium-ion batteries is prepared successfully using a facile polyol refluxing process without any impurity *** X-ray diffraction and Rietveld refinement results confirm that NVPF possesses tetragonal NASICON-type lattice with a space group of P42/*** this preparative method,polyol is utilized as a solvent as well as a carbon *** presence of nanosized NVPF particles in the carbon network is confirmed by field-emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM).The existence of carbon is analyzed by Raman scattering and elemental *** applied as a Na-storage material in a potential window of 2.0-4.3 V,the electrode exhibits two flat voltage plateaus at 3.7 and 4.2 V with an electrochemically active V^3+/V^4+ redox *** addition,Na3V2(PO4)2F3/C composite achieved a retention capacity of ~ 88% even after 1,500 cycles at 15 ***,at high current densities of 30 and 50 C,Na3V2(PO4)2F3/C cathode retains the specific discharge capacities of 108.4 and 105.9 mAh·g-1,respectively,revealing the structural stability of the material prepared through a facile polyol refluxing method.

关键词： fluorophosphate Na3V2(PO4)2F3 polyol process sodium ion batteries long life stability

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Research and development of new neodymium laser glasses

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High Power Laser Science and Engineering 2017年第1期5卷 1-6页

作者： Dongbing He Shuai Kang Liyan Zhang Lin Chen Yajun Ding Qianwen Yin Lili Hu Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Laser Fusion Research Center Chinese Academy of Engineering PhysicsMianyangSichuan 621900China

This work presents a brief introduction on three kinds of newly developed Nd^(3+)-doped laser glasses in Shanghai Institute of Optics and Fine Mechanics(SIOM), China. Two Nd^(3+)-doped phosphate glasses with lower thermal expansion coefficient and thermal shock resistance 4 times higher than that of N31 glass are developed for laser ***:Silicate and Nd:Aluminate glasses with peak emission wavelength at 1061 and 1065 nm, effective emission bandwidth of 34 and 50 nm, respectively, are developed for Exawatt-class laser system application. fluorophosphate glasses with low nonlinear refractive index(n_2=0.6–0.86) and long fluorescence lifetime(430–510 μs) are investigated for the purpose of decreasing B integral in high-power laser system. The properties of all these glasses are presented and compared with those of commercial neodymium laser glasses.

关键词： aluminate glass fluorophosphate glass high-power laser neodymium laser glass phosphate glass silicate glass

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高电压镁离子电池正极材料NaV2O2(PO4)2F/rGO快速和稳定的Mg^2+嵌入

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Science China Materials 2020年第9期63卷 1651-1662页

作者：王军军谭双双张国彬姜亚龙殷亚朦熊方宇李启东黄丹张庆华谷林安琴友麦立强 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Institute of Physics Chinese Academy of SciencesBeijing 100190China

缓慢的Mg^2+扩散动力学和低的工作电势严重阻碍高能量密度镁离子电池(MIBs)的发展.因此,开发具有快速Mg^2+扩散和高工作电势的正极材料是克服MIBs发展阻碍的关键.在本文中,首次提出四方相的Na V2O2(PO4)2F/rGO作为一个有效的Mg^2+宿主.... 详细信息

缓慢的Mg^2+扩散动力学和低的工作电势严重阻碍高能量密度镁离子电池(MIBs)的发展.因此,开发具有快速Mg^2+扩散和高工作电势的正极材料是克服MIBs发展阻碍的关键.在本文中,首次提出四方相的Na V2O2(PO4)2F/rGO作为一个有效的Mg^2+宿主.它展现出3.3 ***^2+/Mg的最高平均放电电压,2.99×10^-10cm^2s^-1的平均Mg^2+扩散系数和9500个循环的超长循环寿命.原位X射线衍射(XRD)表明NaV2O2(PO4)2F/rGO的储镁机制为单相的嵌入/脱出反应.密度泛函理论(DFT)计算表明Mg^2+倾向于沿a方向迁移.X射线吸收近边结构(XANES)表明镁化后钒的平均价态降低且钒位点周围的配位环境得到高度保持.此外,组装的NaV2O2(PO4)2F//Mg0.79NaTi2(PO4)3镁离子全电池表现出高的功率和能量密度,表明NaV2O2(PO4)2F/rGO具有实际应用的潜力.本工作在MIBs正极材料的工作电压方面实现了突破并为发展高能量密度的MIBs提供了新的机会.

关键词： high-voltage fast kinetics MIBs fluorophosphate full cell

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Synthesis/Structure and Cathode Properties of Li_2CoPO_4F for High-Voltage Li-ion Batteries

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复旦学报（自然科学版） 2007年第5期46卷 689-页

作者： S.Okada J.Yamaki Institute for Mterials Chemistry and Engineering Kyushu University6-1 Kasuga-shiFukuoka-ken 816-8580Japan

1 Results Although phospho-olivine LiFePO4 has attracted much attention as next-generation cathode, the gravimetric energy density is restricted. fluorophosphate Li2CoPO4F is strong candidate for new high-voltage cathode with large capacity,if 2 Li+ can be reversibly removed[1]. In the present study, we tried to synthesized Li2CoPO4F by two methods, solid state reaction in vacuumed quartz tube with Pt crucible and melt-quench process using Cu single roller in Ar. The obtained latter amorphous sample was...

关键词： fluorophosphate polyanion cathode Li-ion battery melt-quench process

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