KCl:Li FA(Ⅱ)色心激光晶体材料(综述)

本文以KCl:Li FA(Ⅱ)心为色心激光材料的代表,从材料物理化学的角度分析了KCl-LiCl以及与基质KCl有关的掺杂体系的性质,综述了掺Li+KClFA(Ⅱ)心的主要特性,总结色心激光晶体的制备.     

锰(Ⅱ)化合物对二氧化锰结构及电化学性能的影响

采用氧化还原水热法合成二氧化锰。研究了在氧化剂及反应温度等条件相同的情况下,不同反应时间和还原剂对二氧化锰晶型及电化学性能的影响。通过对产物进行XRD分析发现,还原剂为MnSO4时,仅生成单相α-MnO2;而在Mn(NO3)2和MnCl2溶液中,随着反应时间由2～24 h增加到48 h,产物由含有γ-MnO2的α-MnO2转变为单相β-MnO2。对反应时间为12 h生成的二氧化锰进行了循环充放电测试。结果显示,在Mn(NO3)2和MnCl2溶液中生成的含有γ-MnO2的α-MnO2,其初次放电容量分别为203和186.3 mA.h/g,均比在MnSO4溶液中生成的单相α-MnO2的容量140 mA.h/g高;7次循环充放电后,在Mn(NO3)2,MnCl2和MnSO4溶液中生成的MnO2的容量分别保持在初次放电容量的51%,54%和49%。     

Au衬底的制作及Co(Ⅱ)TsPc/Au的表面增强喇曼散射研究

在表面增强喇曼散射(简称SERS)活性最突出的三种衬底Ag、Cu及Au中,Ag和Cu不仅由于增强效果好,更由于衬底制作的成本低廉,方法多样,而在SERS研究中被广泛使用。相比之下,尽管Au性能稳定,不易氧化,而且在红光激发下具有与Ag和Cu相媲美的增强效果,但终因成本昂贵,制作方法单一等因素的存在,在很大程度上限制了对Au衬底的选用。     

一种新型CMOS电调谐第二代电流传输器(ECCⅡ)

提出了一种新型高线性宽调谐范围的CMOS电调谐第二代电流传输器(ECCⅡ),通过引入两个电流平方电路,使其电流增益能够通过直流偏置连续可调,0＜k≤2.并采用TSMC0.35 μm CMOS工艺参数,±1.5 V供电电源条件下对ECCⅡ进行了HSPICE模拟,结果表明,vX/vY和iZ/iX的-3 dB带宽分别为85 MHz和61 MHz,功耗为5.1 mW.该电路在可调谐连续时间电流模式滤波器设计中有广泛的应用前景.     

联三吡啶铂(Ⅱ)配合物的非线性吸收和光限幅（特邀）

本文总结了2003~2019年报道的联三吡啶铂（Ⅱ）配合物的反饱和吸收或双光子吸收及光限幅研究进展,并对这类配合物的光物理特性,包括基态吸收?激发态吸收?激发态寿命和三重态量子产率?在532 nm的反饱和吸收或光限幅,在近红外光区的双光子吸收,以及构效关系进行了评估。首先介绍了目前光限幅材料和器件的研究现状,对反饱和吸收和双光子吸收材料的基本要求,以及平面正方形铂（Ⅱ）配合物的种类和特性;其次讨论了六个系列联三吡啶类铂（Ⅱ）配合物的反饱和吸收或光限幅及构效关系;随后总结了五个系列联三吡啶铂（Ⅱ）配合物的双光子吸收及结构变化对双光子吸收截面的影响;最后对文献报道的工作进行了小结。根据文献报道的工作发现的一个趋势是:在联三吡啶配体或单齿炔配体上引入取代基可以调节基态和激发态的吸收,特别是在配体上引入给电子基团或增加联三吡啶和其上的芳香环取代基的共平面性会引起基态吸收红移但降低或淬灭激发态的吸收,这样会降低在532 nm的反饱和吸收或光限幅。但是扩展联三吡啶配体上的共轭体系则能大幅提高铂（Ⅱ）配合物的双光子吸收截面,尤其是在联三吡啶配体上引入吸电子的共轭芳香环取代基可以控制基态吸收在500 nm以下,同时保持了在可见光区的长寿命宽幅三重激发态吸收和在近红外光区的中等强度的双光子吸收,这对研制宽幅激光限幅材料有重要意义。     

Highly Efficient Electrochemiluminescence of Functionalized Tris(2,2′‐bipyridyl)ruthenium(II) and Selective Concentration Enrichment of Its Coreactants

An enhanced electrochemiluminescence (ECL) efficiency is obtained from the ruthenium complex tris(2,2′‐bipyridyl)ruthenium(II) (Ru(bpy)₃²⁺) by introduction of an ionic liquid (IL) 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMImBF₄). Upon addition of 1 % (v/v) BMImBF₄ to 0.1 mM Ru(bpy)₃²⁺ solution, a maximum increase in ECL intensity is obtained both at an indium tin oxide (ITO) electrode (15‐fold) and at a glassy carbon (GC) electrode (5‐ to 6‐fold). Furthermore, upon addition of 1 % (v/v) BMImBF₄ to 5 μM Ru(bpy)₃²⁺/100 mM co‐reactant systems at a GC electrode, IL adsorption occurs at the electrode surface, which results in a change of the polarity of the electrode surface. Such functionalization greatly improves the functions of both Ru(bpy)₃²⁺ and ionic liquids, as is demonstrated in the sensitive and selective concentration enrichment of the Ru(bpy)₃²⁺ co‐reactants.     

Crystallization-Induced Enhanced Electrochemiluminescence from a New Tris(bipyridine)ruthenium(II) Derivative

Classic tris(bipyridine)ruthenium(II) complex (Ru-bpy) with high electrochemiluminescence (ECL) efficiency still suffers from a serious aggregation-caused quenching (ACQ) problem, which greatly weakens its ECL efficiency to restrict further applications in solid-state ECL imaging and light-emitting devices. Herein, the crystallization-induced enhanced ECL (CIE-ECL) of tris(bipyridine)ruthenium(II) derivatives (Ru-TPE) are reported by decorating Ru-bpy with inherent aggregation-induced emission active tetraphenylethene (TPE), which effectively eliminates the detrimental π–π stacking interactions and thus helps Ru-bpy surmount notorious ACQ effect in the aqueous phase. The Ru-TPE shows negligible ECL emission in solution but produces a strong ECL emission upon crystallization. Surprisingly, the ECL efficiency of Ru-TPE crystals is 20 and 3 times higher than that of its solution and Ru-bpy crystals, respectively. Experimental and structural analysis reveals that such a CIE-ECL effect originates from the restricted intramolecular rotation and ordered molecular packing. Moreover, the high-resolution ECL imaging of a single Ru-TPE crystal is successfully demonstrated. This work provides a new design strategy for achieving high efficiency in solid-state ECL imaging and devices.     

More on (2,2)-separating systems

The theory of separating systems has been applied in different areas of science and technology such as automata synthesis, technical diagnosis, and authenticating ownership claims. Constructions of (2,2)-separating systems derived from error-correcting codes are given, together with bounds on their parameters based on distance considerations.     

LD端面泵浦掺Nd晶体的热透镜焦距

采用He-Ne光直接测量的方法,在不同的泵浦功率下,对不同掺Nd晶体的热透镜焦距进行了测量,并对测量结果分析和讨论,为LD端面泵浦掺Nd晶体固体激光器的实验研究提供了数据参考。     

DFT Analysis of Vanadium Tris(Dithiolene)-Based Double-Gated Single-Electron Transistor

A double-gated single-electron transistor (SET) based on metal–organic complex vanadium tris(dithiolene) has been modelled and investigated for the operation and electrostatics analysis. Density functional theory and non-equilibrium Green’s function method have been opted for first-principle calculations. For the enhancement of the electrostatic control in the SET operation, an addition of a second gate to the basic configuration of SET has been implemented. The results of the energy calculations have shown the expected enhanced electrostatic control in the SET operation with the incorporation of the second gate. The total energies are used to calculate ionisation energy, affinity energy and addition energies, and have shown reduced values for the double-gated SET. Total energies are also used to plot charge stability diagrams and energy surface plots for different gate voltages, which depict the improved conduction process. Because of its sensitivity towards the molecule’s individual charge states, the resultant double-gated SET can be used as a charge sensor.     

（2，2）贝叶斯理性秘密共享方案

在理性秘密共享协议中,自利性目标可能会驱使理性参与者偏离协议,从而影响协议的公平性。在（t, n）门限理性秘密共享方案中,其特殊情形（2,2）理性秘密共享方案的公平性较难实现。在同时考虑理性参与者的眼前利益和长远利益的基础上,基于不完全信息动态博弈模型,通过分析理性参与者在（2,2）秘密重构阶段可能采取的策略和信念系统,引入理性参与者的期望收益,研究了（2,2）理性秘密共享重构阶段的完美贝叶斯均衡问题。进一步结合机制设计理论中的VCG（Vickrey-Clarke-Groves）机制,设计激励相容的交互记录机制来约束理性参与者的行为,在不需要秘密分发者保持在线的情形下,提出一个适用于异步通信的公平的（2,2）理性秘密共享方案。     

基于HS传感器的固体激光器热透镜焦距测量

基于哈特曼-夏克传感器、激光光束分析仪和谐振腔理论,设计了一种在有激光输出情况下,实时测量固体激光器热透镜焦距的方法,具有简单、便捷、实用的特点。利用此方法,对激光二极管连续端面抽运棒状激光器的热透镜焦距进行了测量,并和理论数值模拟结果进行了对比分析讨论,可为固体激光器的优化设计和实验研究提供参考。     

Electron Mobility in Tris（8—Hydroxyquinolinolato）Aluminum Thin Film Based on Silicium^①②

We have measured the mobilities of electrons in thin,vapor-deposited films of tris(8-hydroxyquinolinolato) aluminum(Alq 3) based on silicium using a time-of-flight(TOF) technique.The drift of electron mobility is strongly electric field and temperature dependent.At room temperature and an electric field of 2×10 5 V·cm -1 ,the effective mobility of electron is 1.0×10 -5 cm 2·V -1 ·s -1 for 200 nm thick sample.     

Bulk Inclusions of Pyridazine‐Based Molecular Rotors in Tris(o‐phenylenedioxy)cyclotriphosphazene (TPP)

A new class of rod‐shaped strongly dipolar molecular rotors for insertion into channels of hexagonal tris(o‐phenylenedioxy)cyclotriphosphazene (TPP) has been examined. Seven different 3,6‐disubstituted pyridazines and one singly 3‐substituted system have been prepared and studied by solid‐state nuclear magnetic resonance (NMR), X‐ray powder diffraction, and dielectric spectroscopy. NMR and X‐ray diffraction both show that all but one of these molecular rotors form hexagonal bulk inclusion compounds with TPP. In‐plane lattice parameters for the hexagonal phases increase with the size of the end group, which also controls the energy barriers for rotation of the pyridazine dipole. The barriers range from ≈4 kcal mol^?1 for small or flexible end groups to less than 0.7 kcal mol^?1 for 3‐methylbicyclo[1.1.1]pent‐1‐yl end groups after annealing to 235 °C, and an interpretation of these differences is offered. Computer modeling of the relaxed TPP channels followed by density functional calculation of the environment for one of the rotors provides quantitative agreement with the observed barrier. The systems with the lowest rotational barriers show signs of collective behavior, discussed in terms of antiferroelectric intrachannel and ferroelectric interchannel dipole–dipole interactions. A Curie temperature of 22 K is deduced for 3,6‐diadamant‐1′‐ylpyridazine, but no ordered dielectric phases are found. Conclusions have been drawn for improved rotor design.     

基于误差扩散算法的（2，2）可视密码方案

为解决传统可视密码存在像素膨胀及分存图像无意义等问题,研究并实现了将黑白反色的密图嵌入到两个灰度图像的方法。通过采用对灰度图像进行预处理增加分存图像叠加后,黑色像素恢复的概率以及在误差扩散的过程中同时嵌入密图信息、适当降低白色像素恢复概率以及恢复黑色像素时随机选择修改其中一个分存图像的方法,有效地提高了分存图像的质量。方案符合可视密码解密简单的特性且分存图像有意义,没有引入任何像素膨胀。