基于有机p型掺杂电荷产生层制备叠层式白光OLED的研究

基于新型有机p型掺杂的电荷产生层,制备了叠层式白光有机发光二极管(OLED).有机p型掺杂层具有很高的导电率,可以在不影响器件电学特性的前提下,通过改变该层的厚度来优化白光OLED的器件性能,调节器件的光色.与传统白光OLED相比,文章研究的叠层式白光OLED制备工艺简单、电荷产生效率高,可应用于平板显示与固态照明.     

一种43 GHz超高带宽线性驱动电路设计

基于0.13μm SiGe BiCMOS工艺,设计了一种线性驱动电路。该电路具有高速和大摆幅的优势,能线性驱动行波马赫-曾德尔调制器(TW-MZM),可满足光通信系统100 Gbit/s单通道的应用需求。驱动电路包括连续时间线性均衡(CTLE)电路、可变增益放大(VGA)电路和基于Cascode结构改进优化的输出级电路,实现了增益可调,且避免发生由较大输出摆幅导致的晶体管击穿。仿真结果表明,电路的-3 dB带宽为43 GHz,其增益在15～25 dB内可调。在56 Gbaud NRZ/PAM4的输入信号下,测得的眼图形状良好,差分输出摆幅峰-峰值达4 V,电路整体功耗为1.02 W,面积为0.33 mm²。     

Non-linear modeling and dynamic analysis of hydraulic control valve; effect of a decision factor between experiment and numerical simulation

Numerical problems that are usually ignored in the dynamic analysis of hydraulic control valves are described, and an analysis of the effects of such problems on the numerical modeling is provided. Previous studies have ignored the effects of changes in the flow coefficient in the orifice, the solenoid force along the spool movement in the valve and an ascending tendency of pressure during reach to the steady state. To eliminate these problems, it was studied a method to substantiate the non-linearity of the pressure loss caused by passing between the orifice and port as well as that caused by interaction with the solenoid. Moreover, the movement of the spool and spring is expressed using the time-delay-element (TDE). The proposed numerical model has been used in the Bond graphs method of a hydraulic control valve and the simulation results have been shown to be accurate. It is known that differences between simulated and experimental results can have a considerable impact on the function of actual systems. The contribution of each parameter is measured separately for the transient state and steady state. Analysis standard observed the first peak value, pressure increase to the steady state and the settling time in the response results.     

MOCVD于高温AlN模板上生长的AlGaN材料

A high temperature AlN template was grown on sapphire substrate by metalorganic chemical vapor deposition.AFM results showed that the root mean square of the surface roughness was just 0.11 nm.Optical transmission spectrum and high resolution X-ray diffraction（XRD）characterization both proved the high quality of the AlN template.The XRD（002）rocking curve full width at half maximum（FWHM）was about 53.7 arcsec and（102）FWHM was about 625 arcsec.The densities of screw threading dislocations（TDs）and edge TDs wereestimated to be - 6 × 10^6 cm^-2 and - 4.7 ×10^9 cm^-2. AlGaN of Al composition 80.2% was further grown on the AlN template. The RMS of the surface roughness was about 0.51 nm. XRD reciprocal space mapping was carried out to accurately determine the Al composition and relaxation status in the AlGaN epilayer. The XRD （002） rocking curve FWHM of the AIGaN epilayer was about 140 arcsec and （102） FWHM was about 537 arcsec. The density of screw TDs was estimated to be - 4 × 10^7 cm^-2 and that of edge TDs was - 3.3 × 10^9 cm^-2. These values all prove the high quality of the AlN template and AlGaN epilayer.     

Lithium–Lanthanide Bimetallic Metal–Organic Frameworks towards Negative Electrode Materials for Lithium-Ion Batteries

Novel lithium–lanthanide (Ln: cerium and praseodymium) bimetallic coordination polymers with formulas C₁₀H₂LnLiO₈ (Ln: Ce (CeLipma) and Pr (PrLipma)) and C₁₀H₃CeO₈ (Cepma) were prepared through a simple hydrothermal method. The three compounds were characterized by means of FTIR spectroscopy, X-ray diffraction, single-crystal X-ray diffraction, SEM, TEM, and X-ray photoelectron spectroscopy. The results of structural refinement show that they belong to triclinic symmetry and P space group with cerium (or praseodymium) and lithium cations, forming coordination bonds to oxygen atoms from different pyromellitic acid molecules, and leading to the construction of 3D structures. It is interesting to note that the frameworks exclude any coordination water and lattice water. As an electrode material for lithium-ion batteries, CeLipma exhibits a maximum capacity of 800.5 mAh g⁻¹ and a retention of 91.4 % after 50 cycles at a current density of 100 mA g⁻¹. The favorable electrochemical properties of the lanthanide coordination polymers show potential application prospects in the field of electrode materials.