Efficient top-emitting white organic light emitting device with an extremely stable chromaticity and viewing-angle

In this paper,we report on the fabrication of a top-emitting electrophosphorescent p-i-n white organic lightemitting diode on the basis of a low-reflectivity Sm/Ag semi-transparent cathode together with a thickness-optimized ZnS out-coupling layer.With a 24-nm out-coupling layer,the reflectivity of the cathode is reduced to 8% at 492 nm and the mean reflectivity is 24% in the visible area.By introducing an efficient electron blocking layer tris(1phenylpyrazolato,N,C2 ’)iridium(III)(Ir(ppz) 3) to confine the exciton recombination area,the current efficiency and the colour stability of the device are effectively improved.A white emission with the Ir(ppz) 3 layer exhibits a maximum current efficiency of 9.8 cd/A at 8 V,and the Commission Internationale de L’Eclairage(CIE) chromaticity coordinates are almost constant during a large voltage change of 6 V-11 V.There is almost no viewing angular dependence in the spectrum when the viewing angle is no more than 45,with a CIE x,y coordinate variation of only(±0.0025,±0.0008).Even at a large viewing angle(75),the CIE x,y coordinate change is as small as(±0.0087,±0.0013).     

The enhancement of 21.2%-power conversion efficiency in polymer photovoltaic cells by using mixed Au nanoparticles with a wide absorption spectrum of 400 nm–1000 nm

Au nanoparticles(NPs) mixed with a majority of bone-like, rod, and cube shapes and a minority of irregular spheres, which can generate a wide absorption spectrum of 400 nm–1000 nm and three localized surface plasmon resonance peaks, respectively, at 525, 575, and 775 nm, are introduced into the hole extraction layer poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate)(PEDOT:PSS) to improve optical-to-electrical conversion performances in polymer photovoltaic cells. With the doping concentration of Au NPs optimized, the cell performance is significantly improved: the short-circuit current density and power conversion efficiency of the poly(3-hexylthiophene): [6,6]-phenylC60-butyric acid methyl ester cell are increased by 20.54% and 21.2%, reaching 11.15 m A·cm-2and 4.23%. The variations of optical, electrical, and morphology with the incorporation of Au NPs in the cells are analyzed in detail, and our results demonstrate that the cell performance improvement can be attributed to a synergistic reaction, including: 1) both the localized surface plasmon resonance- and scattering-induced absorption enhancement of the active layer, 2) Au doping-induced hole transport/extraction ability enhancement, and 3) large interface roughness-induced efficient exciton dissociation and hole collection.     

导流型热蒸发沉积制备微球表面聚酰胺酸涂层

 在自行研制的导流型热蒸发沉积装置上开展了微球表面聚酰胺酸（PAA）涂层制备工艺研究。探讨了单体原料处理和改变升温过程对沉积速率的影响。两种单体分别采用两个相互独立的蒸发源加热蒸发,使用两个晶振膜厚测量探头,通过对膜厚探头、样品盘和导流管端头三者的空间位置和对称关系的调整和实验标定,实现了两种单体近似等化学计量比的沉积。采用间歇性压电振动或敲击配合样品盘的旋转作为微球运动的激励方式,在聚-α-甲基苯乙烯（PAMS）微球上制备出均匀的表面质量好的PAA涂层。     

新型高速光发射模块的设计与分析

介绍了用于高速、宽带光纤通信系统的铌酸锂(LiNbO3)光发射模块的优化设计方法。分析比较了半导体器件与铌酸锂波导器件在作为光纤通信光发射模块时的优缺点。对光发射模块的两个主要器件———掺铒铌酸锂(Er∶LiNbO3)波导激光器和LiNbO3电光调制器进行了结构设计和分析。分析和讨论了电光调制器带宽及半波电压随器件主要参数的变化关系。用BPM软件模拟了所设计的模块的结构特征。该发射模块的发射峰值波长为1531nm,调制速率为10Gbits/s。     

一种低成本的光纤陀螺信号处理方法

讨论了一种低成本的干涉型光纤陀螺的信号处理方法。应用了自动相位跟踪技术,重点解决了PZT的稳定性问题,提高了光纤陀螺的精度。在方案中,以正弦波信号作为相位偏置信号,相位解调运用了同步相关检测的方法。方案的优点是其低成本和易于实现,能够满足在一定条件下陆地导航和定位系统的需要。     

激光跟踪测量系统自校正方法研究

建立了测量系统运动学模型。针对以往在球坐标激光跟踪系统中参考点只能借助于外部更高精度的仪器来校正的缺点,提出了平面约束自校正方法,并对系统进行了自校正研究。仿真结果表明了该方法的有效性。     

光纤激光陀螺线宽压缩技术中滤波器的结构设计与分析

研究了光纤激光陀螺系统中滤波器对激光光谱线宽压缩的影响。在理论分析的基础上,提出了用于光纤激光陀螺的Fabry Perot腔滤波器的方案,并进行了结构设计。试验证明FP腔滤波器可以达到满意的滤波效果。     

基于TMS320C6711的光纤陀螺闭环数字信号处理系统的开发

提出了一种以TI公司的TMS320C6711处理器为基础的有工程意义的闭环光纤陀螺信号处理方案。介绍了闭环光纤陀螺系统的原理和检测方法。对ADC和DAC的选择进行了理论分析,对闭环光纤陀螺数字处理系统的硬件和软件进行了设计。使用了高效的McBSP口与外围ADC,DAC通信,利用JATG口实时监控DSP的工作过程,并升级了程序。针对陀螺系统所要求的实时性开发了能够满足精度要求的高效数字滤波算法。     

引入阱结构改善有机发光器件的效率

利用阱结构作为发光层,阱由8-羟基喹啉铝和 4,4′-N,N′–dicarbazole-biphenyl交替蒸发长成，改善了器件的效率,这归因于增加空穴和电子在薄发光层的堆积，形成的激子有效地被限制在薄的发光层中发光.器件的最大电流效率在外加电压8V时达到4.1cd/A,与一般异质结器件相比效率提高了2倍多.这说明在适当阱数时用简单办法可提高器件的效率.