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利用高温固相反应法制备了新型三元锂离子电池正极材料 Li2 Ru1/3 Co1/3 M1/3 O3(M＝Mn、Ni、Fe)。通过 X 射线衍射技术和电化学性能测试对Li2 Ru1/3 Co1/3 M1/3 O3的微观结构及其电化学性能进行了表征。研究结果表明,Li2 Ru1/3 Co1/3 Ni1/3 O3和Li2 Ru1/3 Co1/3 Fe1/3 O3为六方层状结构,空间群为 R-3M,而 Li2 Ru1/3 Co1/3 Mn1/3 O3保持了单斜结构；电化学性能测试表明 Li2 Ru1/3 Co1/3 Mn1/3 O3的电化学性能优于掺杂Fe和Ni 的三元材料,该材料具有良好的循环性能,在电流密度为16 mA/g 情况下,首次充电容量达到190 mAh/g,首次放电容量为171 mAh/g,50次循环后容量保持率为98％。
Li2 Ru1/3 Co1/3 M1/3 O3 (M = Mn,Ni,Fe)as new cathode material for Li-ion battery were synthesized by solid state reaction.The microstructure and electrochemical performance of Li2 Ru1/3 Co1/3 M1/3 O3 were inves-tigated by X-ray diffraction and electrochemical tests.The result indicated that Li2 Ru1/3 Co1/3 Ni1/3 O3 and Li2 Ru1/3 Co1/3 Fe1/3 O3 had a layered structure and their space groups were R-3M.Li2 Ru1/3 Co1/3 Mn1/3 O3 electrode had a good electrochemical reversibility between 2.5 and 4.8 V.During the chage and discharge process,the ini-tial charging capacity can reach 190 mAh/g at a charge current density of 16 mA/g.The discharge capacity re-tention was 98% after 50 cycles.

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The phosphors that are able to convert vacuum ultraviolet(VUV)light into visible light are demanded for the development of novel displaying and lighting devices.NaYF4:Pr3+,Dy3+,NaGdF4:Pr3+,NaGdF4:Dy3+and NaGdF4:Pr3+,Dy3+were prepared by hydrothermal synthesis method and their luminescent properties in VUV-vis spectral region were investigated at room temperature.For NaYF4:Pr3+,Dy3+,no energy transfer process from Pr3+to Dy3+was observed.However,the introduction of Gd3+into the fluoride lattice led to intense Dy3+emissions upon Pr3+4f5d state excitation.Gd3+acted as an intermediate,resulting in efficient energy transfer from Pr3+to Dy3+in NaGdF4.Pr3+transferred most of its energy to Gd3+,and then the energy was transferred from Gd3+to Dy3+.So NaGdF4:Pr3+,Dy3+not only took full advantage of the intense Pr3+4f5d absorption,but converted the VUV excitation light into the near-white emission of Dy3+.
The phosphors that are able to convert vacuum ultraviolet (VUV) light into visible light are demanded for the development of novel displaying and lighting devices. NaYF4:Pr3+,Dy3+, NaGdF4:Pr3+, NaGdF4:Dy3+ and NaGdF4:Pr3+,Dy3+ were prepared by hydrothermal synthesis method and their luminescent properties in VUV-vis spectral region were investigated at room temperature. For NaYF4:Pr3+,Dy3+, no energy transfer process from Pr3+to Dy3+was observed. However, the introduction of Gd3+into the fluoride lattice led to intense Dy3+emissions upon Pr3+4f5d state excitation. Gd3+acted as an intermediate, resulting in efficient energy trans-fer from Pr3+to Dy3+in NaGdF4. Pr3+transferred most of its energy to Gd3+, and then the energy was transferred from Gd3+to Dy3+. So NaGdF4:Pr3+,Dy3+not only took full advantage of the intense Pr3+4f5d absorption, but converted the VUV excitation light into the near-white emission of Dy3+.

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目的 探讨肠道病毒71型(EV71)编码的3C蛋白酶对于肿瘤坏死因子受体相关因子3(TRAF3)的切割作用.方法 采用Western blot的方法检测EV71感染对于TRAF3蛋白表达的影响.体外转染TRAF3和3C蛋白,通过Western blot检测3C对于TRAF3蛋白的影响.通过构建3C突变体,检测其蛋白酶活性对于切割的影响.通过免疫共沉淀检测3C对于TRAF3和TRIF相互作用 的影响.结果 EV71感染细胞后可引起TRAF3蛋白的减少,其3C蛋白酶可以引起TRAF3的切割,蛋白酶活性位点突变后则不引起TRAF3的切割.位点突变试验显示TRAF3的Q242位突变后则不能被3C切割,且3C可以减少TRAF3与TRIF的结合.结论 EV71 3C蛋白酶可通过切割TRAF3机制在天然免疫逃逸中发挥作用.
Objective To clarify whether Enterovirus 71 3C protease,a key player in immunity evasion in EV71 infection,can cleave TNF receptor-associated factor 3 (TRAF3).Methods Western blot was used to explore the TRAF3 expression in EV71-infected cells.Plasmids expressing TRAF3 and 3C were then cotransfected into cells to detect whether 3C induces TRAF3 cleavage.A mutational analysis was carried out to explore the sites in TRAF3 for 3C cleavage.The effect of 3C on the interaction between TRAF3 and TRIF was analyzed by immunoprecipitation analysis.Results The TRAF3 expression was reduced by EV71 infection,and 3C induced the cleavage of TRAF3.The cleavage depended on 3C protease activity.The Q242-G243 is the cleavage site of 3C in TRAF3.3C also impeded the interaction between TRAF3 and TRIF.Conclusions 3C induces TRAF3 cleavage in a protease activity dependent manner,which may in turn antagonizes innate immunity.

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利用原子化反应法和生成反应法在 G3、G3X （X＝B3，MP2，MP2B3）、B3LYP/CC-PVTZ 和 CBS-4M 水平下对 NF3、NF5、NFO、NFO2、NF3 O、N2 F2、N2 F4、N3 F、NF3 BF3、NFOBF3、NFO2 BF3和 NF3 OBF3的生成焓进行了量子化学计算，在 G3水平下计算了这些物质的热力学性质。结果表明，G3方法结合生成反应法能准确预测此类物质的生成焓，热力学性质计算值与实验值均非常接近，证明 G3方法适用于计算此类物质的热力学性质。
The heats of formation of NF3 ,NF5 ,NFO,NFO2 ,NF3 O,N2 F2 ,N2 F4 ,N3 F,NF3 BF3 ,NFOBF3 ,NFO2 BF3 and NF3 OBF3 were calculated using atomization reaction (AR),formation reaction (FR)at the G3,G3 (X)(X = B3,MP2 and MP2B3),B3LYP/CC-PVTZ and CBS-4M levels,and the thermodynamic functions of these compounds were calculated under G3 level.Results show that FR in conjunction with the G3 theory can accurately evaluate the heats of formation of these compounds. The results agree well with the experimental data,showing that G3 is suitable for calculating the thermodynamic functions of these compounds.

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稀土离子Pr3+和Nd3+对上转换材料的发光具有特殊的敏化作用,通过在NaLuF4:Yb3+,Er3+纳米晶中共掺杂稀土离子Pr3+和Nd3+并研究它们与发光中心Er3+之间的能量传递机制.采用水热法分别合成了Pr3+和Nd3+掺杂的NaLuF4:Yb3+,Er3+纳米晶,直径约为15 nm,具有六方相结构.发光特性分析表明,随Pr3+离子掺杂浓度增加,NaLuF4:Yb3+,Er3+纳米晶的656 nm红光强度相对于544 nm绿光逐渐减弱;但是随着Nd3+离子掺杂浓度增加,其发光红绿比刚好出现相反的变化.基于功率变换谱和简化能级图分析了Pr3+-Er3+和Nd3+-Er3+之间的能量传递机制,揭示了Er3+的4I11/2能级的电子布居在多个跃迁过程中所起的关键作用.
The doping of rare earth ion Pr3+and Nd3+has unique sensitization effect on the luminescence of upconversion materials.In the submitted work,the energy transfer mechanisms between Pr3+/Nd3+and Er3+were investigated in NaLuF4:Yb3+,Er3+nanocrystals codoped with Pr3+or Nd3+ions.NaLuF4:Yb3+,Er3+nanocrystals codoped with Pr3+or Nd3+ions were synthesized by hydrothermal method which had an average diameter of 15 nm and hexagonal phase structures.The luminescent properties analysis indicated that the intensity ratio of 656 nm red to 544 nm green emission decreases with increasing the content of Pr3+ions.But,a completely contrary variation was observed with increasing the content of Nd3+ions.The energy transfer between Pr3+and Er3+or between Nd3+and Er3+were investigated based on the power dependence of emission intensity and simplified energy diagram,which indicated that the population of 4I11/2 state of Er3+ions plays a key role in many transitions.

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Through a hydrothermal route,the Er3+and Tm3+co-doped SrYbF5nanosheets were synthesized.The resulting samples were characterized by X-ray diffraction,scanning electron microscopy,energy dispersive X-ray spectroscopy and luminescence spectra.Under the excitation of 980 nm laser irradiation,the upconversion emissions of Tm3+ions centered at 474 nm(1G4→3H6),679 nm(3F2→3H6),699 nm(3F3→3H6),803 nm(3H4→3H6)and emissions of Er3+ions centered at 522 nm(2H11/2→4I15/2),543 nm(4S3/2→4I15/2),654 nm(4F9/2→4I15/2)were observed.The upconversion emissions of Er3+ions were adjusted by the concentration of Tm3+ions.The energy transfer mechanisms among Er3+-Yb3+-Tm3+in SrYbF5nanosheets were discussed.
Through a hydrothermal route, the Er3+and Tm3+co-doped SrYbF5 nanosheets were synthesized. The resulting samples were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and luminescence spec-tra. Under the excitation of 980 nm laser irradiation, the upconversion emissions of Tm3+ions centered at 474 nm (1G4→3H6), 679 nm (3F2→3H6), 699 nm (3F3→3H6), 803 nm (3H4→3H6) and emissions of Er3+ions centered at 522 nm (2H11/2→4I15/2), 543 nm (4S3/2→4I15/2), 654 nm (4F9/2→4I15/2) were observed. The upconversion emissions of Er3+ions were adjusted by the concentration of Tm3+ions. The energy transfer mechanisms among Er3+-Yb3+-Tm3+in SrYbF5 nanosheets were discussed.

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利用具有钙钛矿结构的有机-无机杂化卤化物制备的太阳能电池，由于具有溶液可加工性和高光电转换效率，受到了广泛关注.在目前报道的最高光电转换效率的器件中，采用了CH3NH3PbI(3?x)Clx碘氯混合钙钛矿作为吸光层，据报道在这种材料中光电子的扩散长度可以超过1μm.本文综述了在CH3NH3PbI(3?x)Clx方面现有的研究工作，指出了薄膜制备条件的重要性，并研究了CH3NH3I在PbCl2/CH3NH3I热解法制备CH3NH3PbI(3?x)Clx吸光层中的作用.扫描电子显微镜研究表明CH3NH3I加入量为PbCl2的2倍到2.75倍时， CH3NH3I加入量的增加可以提高CH3NH3PbI(3?x)Clx吸光层的覆盖度和结晶度， CH3NH3I加入量进一步增加到3倍时，形貌变化不大. X射线光电子能谱的数据证实了CH3NH3I加入量对覆盖度的影响，并显示在CH3NH3I加入量大于PbCl2的2.5倍以后， CH3NH3PbI(3?x)Clx中氯的掺入量急剧下降.光电测试表明器件性能随CH3 NH3 I加入量增加而增加，在CH3 NH3 I/PbCl2为3/1时达到最高，加入量略小于3/1对性能影响不大.
Perovskite solar cell, which is prepared by using the organic-inorganic hybrid halide CH3NH3PbX3 (X = I, Cl and Br), receives widespread attention because of its solution processability and high photon-to-electron conversion e?-ciency. The highest reported photon-to-electron conversion e?ciency is that using CH3NH3PbI(3?x)Clx as an absorber. It is reported that the diffusion length is greater than 1 micrometer in this mixed halide perovskite. The method most commonly used in preparing CH3NH3PbI(3?x)Clx film is the one-step pyrolysis method, which has a complex reaction mechanism. In this paper, we review the work about CH3NH3PbI(3?x)Clx perovskite, in which emphasis is put on the importance of the preparation process, and analyze the role of CH3NH3I in the one-step pyrolysis method for fabricating the CH3NH3PbI(3?x)Clxperovskite layer. Scanning electron microscope images show that CH3NH3I can improve the cov-erage and crystallinity of the perovskite layer for precursors in lo

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采用高温固相法合成了稀土离子Pr3+、Sm3+、Tb3+、Dy3+、Tm3+掺杂的正交相CaZrO3荧光粉。利用X射线粉末衍射( XRD)对样品的结构进行表征,并通过荧光光谱对其发光性质进行了研究。在适当近紫外或蓝光激发下,CaZrO3∶Pr3+产生很强的绿光发射,CaZrO3∶Sm3+可发射550~700 nm的红橙光,Tm3+在CaZrO3中可获得良好的蓝光发射。研究结果表明,通过改变CaZrO3中的掺杂离子可实现其发光颜色的调控,稀土离子掺杂CaZrO3荧光粉是很有潜力的新型发光材料。
The orthorhombic CaZrO3∶Ln ( Ln=Pr3+, Sm3+, Tb3+, Dy3+, Tm3+) were successfully syn-thesized by solid-state reaction method. The crystalline structure of the samples were characterized by X-ray diffraction ( XRD ) . The luminescence properties were investigated using photolumines-cence spectra. Under appropriate near UV- or blue light-radiation, CaZrO3∶ Pr3+ showed strong green light emission, CaZrO3∶Sm3+ showed well reddish orange light in the range of 550-700 nm, and CaZrO3∶Tm3+ generated well blue light emission. The results indicate that spectral tuning can be realized by adjusting active ions in CaZrO3 , thus rare earth ions-doped CaZrO3 phosphors can be exploited as new luminescence materials.

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采用微波辐射辅助柠檬酸络合法制备Ho3+/Tm3+/Yb3+共掺杂CaWO4纳米晶升频转换荧光粉。将柠檬酸络合物前驱体在300~700°C热处理3 h。Ho3+/Tm3+/Yb3+共掺杂CaWO4C在400°C时开始结晶，在600°C时结晶完成。经600°C 热处理的 Ho3+/Tm3+/Yb3+共掺杂 CaWO4主要呈球形，且形态均匀。在980 nm 的激光激发下， Ho3+/Tm3+/Yb3+共掺杂CaWO4纳米晶出现肉眼可见的明亮的白色升频转换发射，这种现象来自Tm3+的475 nm蓝光发射以及Ho3+的543 nm绿光和651 nm红光发射。通过调整Tm3+和Ho3+的浓度可以控制Ho3+/Tm3+/Yb3+共掺杂CaWO4的CIE色度图从冷到暖白色之间变化。讨论了Tm3+和Ho3+浓度对升频转换光性能的影响以及与激光泵功率相关的影响机制。
The nanocrystalline Ho3+/Tm3+/Yb3+co-doped CaWO4 upconversion (UC) phosphors were successfully synthesized by a modified citrate complex method using microwave irradiation. The citrate complex precursors were heat-treated at temperature ranging from 300 to 700 °C for 3 h. Crystallization of the Ho3+/Tm3+/Yb3+co-doped CaWO4 was detected at 400 °C, and entirely completed at 600 °C. The Ho3+/Tm3+/Yb3+ co-doped CaWO4 heat-treated at 600 °C showed primarily spherical and homogeneous morphology. Under the laser excitation of 980 nm, Ho3+/Tm3+/Yb3+ co-doped CaWO4 shows the bright white upconversion (UC) emission visible to the naked eye, which is composed of a blue emission at 475 nm from Tm3+, and green and red emissions at 543 and 651 nm respectively from Ho3+. The coordinates of Ho3+/Tm3+/Yb3+ co-doped CaWO4 in the Commission International De’eclairage (CIE) chromaticity diagram could be controlled from a cool to a warm white color depending on the Tm3+and Ho3+concentrations

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Yb3+and Pr3+co-doped BaRE2ZnO5(RE=Y,Gd)up-conversion(UC)phosphors were successfully synthesized by a modified sol-gel method.The processing parameters and optimal concentration of Pr3+and Yb3+were determined.The structures and luminescent properties of samples were characterized by X-ray diffraction(XRD)and photoluminescence spectra(PL).With the excitation of 980 nm laser diode,UC spectra showed five prominent emission bands centered at 484,514,546,656 and 670 nm,which were attributed to the1I6→3H4,3P1→3H4,3P0→3H5,3P0→3F2and3P0→3F3transitions of Pr3+,respectively.In the light of the pump power dependence,the possible UC mechanism in Yb3+and Pr3+co-doped BaRE2ZnO5(RE=Y,Gd)was proposed and discussed.
Yb3+and Pr3+co-doped BaRE2ZnO5 (RE=Y, Gd) up-conversion (UC) phosphors were successfully synthesized by a modi-fied sol-gel method. The processing parameters and optimal concentration of Pr3+and Yb3+were determined. The structures and lu-minescent properties of samples were characterized by X-ray diffraction (XRD) and photoluminescence spectra (PL). With the exci-tation of 980 nm laser diode, UC spectra showed five prominent emission bands centered at 484, 514, 546 , 656 and 670 nm, which were attributed to the 1I6→3H4, 3P1→3H4, 3P0→3H5, 3P0→3F2 and 3P0→3F3 transitions of Pr3+, respectively. In the light of the pump power dependence, the possible UC mechanism in Yb3+and Pr3+co-doped BaRE2ZnO5 (RE=Y, Gd) was proposed and discussed.

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