线性加速度计在压电陀螺卡尔曼滤波技术中的应用

针对光电稳定平台常用的压电陀螺随机游走噪声大的缺点,提出采用基于线性加速度计的卡尔曼滤波技术对其进行信号滤波。利用卡尔曼滤波理论,建立了压电陀螺角速率状态观测方程,采用线性加速度计测量平台惯性角加速度,由此对陀螺信号进行了滤波。实验结果表明：采用线性加速度计能够在不影响陀螺带宽的前提下将压电陀螺的随机游走噪声水平由原有的0.005（°）.s-1/槡Hz降低到0.001 25（°）.s-1/槡Hz,提高了光电平台的稳定精度。     

基于苯并三氮唑类化合物的铱络合物的合成及性能

金属铱络合物由于其特殊的光物理化学性质而得到了广泛的关注。主要研究了配体为苯并三氮唑衍生物的三种新型铱配合物,Ir(TBT)、Ir(EBT)和Ir(CBT)的合成及表征,并对其物理性能进行了一定的研究。通过研究发现该类铱化合物的最大发射波长可以通过修饰配体调节,其中化合物Ir(TBT)的最大发光峰为598nm,并且利用Gaussian 03、B3LYP/6-31G*程序对三个配体进行量子化学计算,计算结果与实验结果吻合。通过差热分析法对其进行热稳定性测试后发现其玻璃化温度为133℃,该类化合物在电致发光领域具有潜在的应用价值。     

苯的激光拉曼光谱检测研究

为了对苯的质量分数进行快速准确的检测,采用拉曼光谱法进行检测.对苯的激光拉曼光谱进行了理论分析,进行了标准样品和不同质量分数苯样品的系列拉曼光谱实验.结果表明:苯的拉曼光谱特征峰值与苯的含量成正比,将最强的561.4 nm处的峰值代入线性回归公式,即可得到苯的质量分数,检出限达0.3%.得到一种新的苯质量分数检测方法.     

Theoretical Studies on the Thermodynamic Properties and Detonation Performances of Bicyclic Nitramines： TNAD Isomers

1 INTRODUCTION Nowadays, HEDMs have been receiving heated attention because of their superior explosive per- formances to the currently used materials. Searching for novel HEDMs to meet the future demands has become one of the most activated regions and seems to be never ending. As is well known, nitramines have important applications in both civilian and military fields for a long time. This group of com- pounds is still a source of explosives or propellants that possess predominantl…     

紧凑式低温换热器的发展概况

介绍了一些目前低温与制冷领域中使用的紧凑式换热器,对其特点、性能以及发展动态和研究方向进行了细致的分析和综述。同时也给出了一些观点,为低温换热器的设计及以后的深入研究提供参考。     

Pyrene-Benzimidazole Derivatives as Novel Blue Emitters for OLEDs

Three novel small organic heterocyclic compounds: 2-(1,2-diphenyl)-1H-benzimidazole-7-tert-butylpyrene (compound A), 1,3-di(1,2-diphenyl)-1H-benzimidazole-7-tert-butylpyrene (compound B), and 1,3,6,8-tetra(1,2-diphenyl)-1H-benzimidazolepyrene (compound C) were synthesized and characterized for possible applications as blue OLED emitters. The specific molecular design targeted decreasing intermolecular aggregation and disrupting crystallinity in the solid-state, in order to reduce dye aggregation, and thus obtain efficient pure blue photo- and electroluminescence. Accordingly, the new compounds displayed reasonably high spectral purity in both solution- and solid-states with average CIE coordinates of (0.160 ± 0.005, 0.029 ± 0.009) in solution and (0.152 ± 0.007, 0.126 ± 0.005) in solid-state. These compounds showed a systematic decrease in degree of crystallinity and intermolecular aggregation due to increasing steric hindrance, as revealed using powder X-ray diffraction analysis and spectroscopic studies. An organic light-emitting diode (OLED) prototype fabricated using compound B as the non-doped emissive layer displayed an external quantum efficiency (EQE) of 0.35 (±0.04)% and luminance 100 (±6) cd m⁻² at 5.5 V with an essentially pure blue electroluminescence corresponding to CIE coordinates of (0.1482, 0.1300). The highest EQE observed from this OLED prototype was 4.3 (±0.3)% at 3.5 V, and the highest luminance of 290 (±10) cd m⁻² at 7.5 V. These values were found comparable to characteristics of the best pure blue OLED devices based on simple fluorescent small-molecule organic chromophores.     

Exciton-assisted tunneling transport in heterojunction microstructures

Longitudinal tunneling transport in the low-dimensional heterojunction structures induced by the excitonic Coulomb interaction has been formulated and discussed in the framework of Fermi's golden rule. We have investigated the tunneling transition of free carriers to quantum-well Wannier–Mott excitons incorporated in the sequential tunneling Hamiltonian. The modeling is evaluated by a set of coupled rate equations involving subband states of electron, hole and exciton. The exciton-assisted tunneling (EAT) phenomenon has its characteristic fingerprint causing tunneling current prior to the resonance electric fields, and a significant modulation of the I–V characteristics. It is also found that the bias offset and the FWHM of the EAT current spectrum can be comparable to that of resonant tunneling (RT) current, depending both on the 2D hole density of the confined subband and the excitonic properties in the active region. The EAT effect has a different I–V spectral line shape, compared to that of the RT or its replica, tailing off in the resonance regime induced by the exciton binding energy.     

21世纪的光学和光电子学讲座 第二讲 硅基发光材料和器件研究

硅基发光材料和器件是实现光电子集成的关键．文章评述了目前取得较大进展的几种主要硅基发光材料和器件的研究,包括掺饵硅,多孔硅,纳米硅以及Ｓｉ／ＳｉＯ２ 等超晶格结构材料．展望了这些不同硅基发光材料作为发光器件和在光电集成中的发展前景     

钛宝石泵浦的Yb:YAG晶体的激光性能

测量了Yb:YAG晶体的光谱特性,用Ar⁺离子泵浦钛宝石激光器作为泵浦源泵浦Yb:YAG晶体,采用平平腔设计,当输出耦合镜T_1.053μm=4.26%,泵浦功率为1410mW时,得到320mW1.053μm的高效CW激光输出,斜率效率为54%,外推阈值功率为203mW。     

具有全方位光管理能力的光阱结构

本文提出了一种基于砷化镓(GaAs)材料且具有全方位光管理能力的纳米方形光阱结构.通过光学模拟可知,该结构在较大结构参数范围内具有优异的全向光管理能力.当该结构的有效厚度为407 nm时,在AM1.5G光照下,其光电流密度可达29.51 mA/cm~2,而在同样条件下,2000 nm厚的平面GaAs结构只能产生19.80 mA/cm~2的光电流密度.由光电模拟可知,为了获得合理的高光电转换效率,应使少数载流子寿命大于等于1.0×10~(-7 )s,表面复合速率小于等于100 s/cm.