氧化铝对稀土有机配合物掺杂溶胶凝胶玻璃结构及发光性能的影响

Both silica glass materials singly doped with rare earth organic complex and co-doped with Al^3 were prepared by in situ sol-gel method respectively. XRD and SEM measurements were performed to verify the non-crystalline structure of the glass. The excitation spectra, emission spectra and IR spectra were measured to analyze the influence of the glass contents on the structure of the glass and the energy level of the doped Eu(IH) ions. The effect of Al^3 on the photoluminescence properties of rare earth organic complex in silica glass was investigated. The IR spectra indicated that the in situ synthesized europium complex molecule was confined to the micropores of the host and the vibration of the ligands was frozen. When Al2O3 was doped into the silica host gel, the rare earth ions in the silica network were wrapped up and dispersed by Al2O3, so the distribution of Eu(Ⅲ) complex in the host was morehomogeneous, and the luminescence intensity of ^5D0-^7F2 transition emission of the Eu^3 ions was improved. The results showed that an appropriate amount of Al^3 added to the gel glass improved the emission intensity of the complex in the silica glass, and when the content of Al2O3 reached 4 mol%, the maximum emission intensity could be obtained compared with that of other samples containing different Al2O3 contents.     

双-（5-氟水杨醛）缩邻苯二胺双席夫碱及其锌配合物的结构和荧光性能

采用新法合成含氟席夫碱,双-（5-氟水杨醛）缩邻苯二胺双席夫碱（C20H14F2N2O2）,并对此化合物单晶进行了χ射线单晶衍射,其属于单斜晶系,P2(1)/c空间群,晶胞参数a=6.0938(8), b=16.347(2),c=94.474(2),V=1651.9(4),Z=4, Dc=1.417,V= 1651.95(4) Å 3,μ(MoKa) =0.11mm,F(000)=728,T =293 K,R= 0.032。还制备了双-（5-氟水杨醛）缩邻苯二胺双席夫碱锌（C20H14F2N2O2Zn）配合物,通过核磁共振谱,红外光谱,元素分析等分析手段对此化合物进行结构表征和分析,且探讨了其固态和溶液的荧光性能。     

粒子数密度对飞秒Gauss型脉冲传播及光谱特性的影响

利用预估校正-时域有限差分(PC-FDTD)法求解全波Maxwell-Bloch方程,研究介质粒子数密度(N)对飞秒Gauss型激光脉冲在Λ型三能级原子介质中传播及光谱特性的影响.结果表明:小面积2π脉冲在不同N介质中都不发生分裂,脉冲频谱基本没有新的高频成分产生,随N增大中心频率附近光谱强度明显减小.面积4π脉冲,在N较大的稀疏介质及稠密介质中都产生分裂,在稀疏介质中随N增大频谱展宽幅度及高频成分强度增大,但在稠密介质中频谱展宽变小且远小于N较大时的稀疏介质情况.大面积8π脉冲,脉冲分裂情况与4π脉冲情况相似,但随N增大频谱展宽幅度及高频成分强度单调增大,且在稠密介质中的频谱展宽幅度及高频成分强度远大于N较小的稀疏介质情况.     

增强掺Tb凝胶玻璃荧光性能的有机螯合体的选择

采用原位合成技术, 用溶胶凝胶法制备了稀土离子(Tb^3＋), β-二酮及协同体共掺的二氧化硅玻璃, 测量了它们发射光谱和红外光谱, 并进行了XRD, SEM和TG-DSC测试. 探讨各不同成分原位合成稀土有机配合物在二氧化硅玻璃中的发光性能及热处理温度对发光性能的影响. 结果表明, 在凝胶玻璃中掺入能级较匹配的β-二酮, 可以使稀土离子的荧光增强; 合适的协同体的引用也能使稀土离子的荧光增强. 这些结果为今后制备荧光较强的含Tb离子的SiO₂凝胶玻璃提供了一定的依据.     

熔盐法制备SrTiO3片状晶的研究

采用熔盐法(MSS)合成了片状SrTiO₃晶体,主要由两个步骤来完成,首先在助熔剂KCl中合成片状前驱体Sr₃Ti₂O₇,然后再通过SrTiO₃生长基元在第一步获得的片状晶体Sr₃Ti₂O₇上进行生长制备出片状SrTiO₃.采用扫描电镜(SEM)、 X射线衍射(XRD)分析产物的显微结构,表明熔盐法制备的SrTiO₃具有纯度高、明显的片状结构等特点,在1200℃下保温4 h,产物的衍射指标与钛酸锶的标准图谱基本上完全一致.1200℃下保温2 h获得的片状钛酸锶晶粒尺寸基本上符合要求(长10～15 μm),而时间延长后,在1200℃下保温4 h获得的钛酸锶晶粒尺寸达到40 μm以上.常规固相合成SrTiO₃具有球状显微结构.     

基于Frobenius定理的Hamilton-Jacobi方法的几何解释

给出了一阶偏微分方程特征微分方程组的一种基于Frobenius定理的几何解释,通过研究发现根据Frobenius定理可以从一阶偏微分方程直接得到其特征微分方程组;在此基础上说明如何利用几何方法从Hamilton正则方程出发找到与之对应的Hamilton-Jacobi方程.这种方法可以被用于非保守或非完整Hamilton力学问题的研究中,经典Hamilton-Jacobi方法是这种方法的一个特例.     

铽配合物Tb(BA)3phen的有机电致发光

合成了一类新型稀土配合物Tb(BA)3phen,将其掺杂到导电聚合物PVK中获得了纯正、明亮的绿光发射.用这种搀杂体系分别制作了单层发光器件和双层器件.对于单层器件,掺杂浓度为15,甩膜转速1000 r·min-1时器件的发光效果最好,起亮电压为10V,最大亮度在21 V时可达26.8cd·m-2.双层器件用AlQ作为电子传输层,通过改变其厚度得到了发光性能较好的用AlQ作为电子传输材料的器件,其最大亮度在22 V时可达322cd·m-2.     

Stereodynamics of the reactions Ne+H₂⁺/Ne+D₂⁺/Ne+T₂

The vector correlations between products and reagents for the reactions Ne+H + 2 , Ne+D + 2 , and Ne+T + 2 are calculated by means of the quasi-classical trajectory method on a new potential energy surface constructed by Lü et al. [J. Chem. Phys. 2010 132, 014303]. The polarization-dependent differential cross-sections (2π/σ)(dσ 00 /dω t ), (2π/σ)(dσ 20 /dω t ), (2π/σ)(dσ 22+ /dω t ), and (2π/σ)(dσ 21 /dω t ), and the distributions of P (θ r ), P (φ r ), and P (θ r ,φ r ) are calculated. The isotopic effect, which is associated with the difference in mass factor among the three reactions, is revealed.     

Stereodynamics of the reactions Ne+H2+/Ne+D2+/Ne+T2

The vector correlations between products and reagents for the reactions Ne+H + 2 , Ne+D + 2 , and Ne+T + 2 are calculated by means of the quasi-classical trajectory method on a new potential energy surface constructed by Lü et al. [J. Chem. Phys. 2010 132, 014303]. The polarization-dependent differential cross-sections (2π/σ)(dσ 00 /dω t ), (2π/σ)(dσ 20 /dω t ), (2π/σ)(dσ 22+ /dω t ), and (2π/σ)(dσ 21 /dω t ), and the distributions of P (θ r ), P (φ r ), and P (θ r ,φ r ) are calculated. The isotopic effect, which is associated with the difference in mass factor among the three reactions, is revealed.     

镧(Ⅲ)离子对菲律宾蛤仔不同组织金属硫蛋白诱导的研究

稀土离子能否诱导海洋生物的金属硫蛋白(MT)合成,将影响到MT对海水重金属的指示作用。以菲律宾蛤仔(Ruditapes philippinarum)为试验动物,采用含镧(Ⅲ)离子(La3+)的人工海水对其进行暴露培养,测定得到蛤仔鳃部和内脏中MT含量随暴露浓度和时间的变化。结果表明,La3+能够促进蛤仔MT的诱导,当以1×102μg.L-1La3+对蛤仔暴露培养5 d时,鳃部和内脏MT含量均达到最高水平,分别为0.135±0.014μmol-SH/g和0.276±0.025μmol-SH/g;1×10-1~1×102μg.L-1的La3+对鳃部MT的诱导作用较大,继续增加La3+浓度,诱导作用有所降低;1×10-1~1×104μg.L-1的La3+对内脏MT均有较好诱导,并基本保持恒定,表明La3+对机体MT的诱导具有一定限度。值得注意的是,我国某些海域的海水稀土离子浓度已达到可诱导双壳类MT合成的水平。