Low dielectric constant materials

The more advanced an integrated circuit becomes, the more stringent are the demands for certain properties of a dielectric or insulating material. In addition, it is essential that the layer maintain its specific electrical, physical, and chemical properties after incorporation in the device structure and during subsequent processing. Due to temperature budget constraints and the accelerated decrease of feature sizes below 0.25 μm, one can no longer rely on traditional choices but has to search for alternatives, both for low and high permittivity replacements. In this article we survey currently used low dielectric constant materials and future trends for microelectronic applications.     

OLED技术及柔性OLED性能、缺陷的研究

OLED凭借其在厚度、视角以及在发光效率等方面的优势成为目前平板显示技术开发的重点。首先简单介绍了OLED的结构、发光原理、驱动电路、发光材料等基本概念。重点针对柔性OLED,阐述了它的优点、缺陷,并进一步对其性能的改善做了相关研究。     

OLED技术及面临的技术问题探讨

OLED作为平板显示技术的新一代宠儿,成为近年来平板显示技术研究的主要方向之一。本文从OLED技术发展历史开始,介绍了OLED技术分类、技术原理和技术特点并对OLED面临的技术问题进行了探讨,并对OLED市场前景进行了展望。     

Validation of a novel dielectric constant simulation model and the determination of its physical parameters

Precise determination of the dielectric constant of microelectronic packaging materials is critical for the performance optimization of high frequency devices. Accurate empirical data, however, is difficult to obtain and often not available for these complex composite materials. In order to provide a basis for predictive model verification, dielectric analysis of a series of model microelectronic packaging materials was conducted. Physical characteristics of the composite constituents, including the morphology of the dispersed phase as well as the dielectric constant of the dispersed and host phases, were used to define the indeterminate variables. The results of these analyses provide a systematic verification of a newly developed physical model for predicting the effective dielectric constant of complex composite systems. The model considers an interphase zone surrounding each dispersed particle having unique physical and electrical characteristics. A physical interpretation is presented to explain the indeterminate variables incorporated in this model.     

新型低介电常数材料研究进展

在超大规模集成电路中,随着器件集成度的提高和延迟时间的进一步减小,需要应用新型低介电常数(k<3)材料。本文介绍了当前正在研究和开发的几种低介电材料,其中包括聚合物、掺氟、多孔和纳米介电材料。     

有机电致发光的研究及进展

介绍有机电致发光器件的优点、结构及发光机理，评价有机电致发光器件的一些主要参数。说明OLED是一种很有前途的显示技术。     

低介电常数、低CTE、高Tg PCB基材的制法

通过实例介绍了低介电常数、低CTE、高Tg印制电路板基材的制法。     

MICROWAVE MEASUREMENT OF COMPLEX DIELECTRIC CONSTANT

In this paper,the formula given by S.Roberts and A.Von Hippel (1946) has been extended.We make a program for calculating the phase transmission constant of the tested material which is put into thewavegoide and for obtaining the multi-value solutions.Tbe method for,determining ε_r and tanδ of a testedmaterial does not need special equipments,but it can meet the accuracy requirement for testing ordinarymaterials.     

小分子OLED器件的制作

介绍了小分子OLED器件的基本结构和制作设备,制作了两种Alq_3基的小分子OLED器件,器件的结构分别为ITO/NPB(400)/Alq_3(300)/Al和ITO/NPB(400)/Alq_3(300)/LiF/Al,讨论了Al阴极中有无LiF对器件性能的影响,包括开启电压以及电流密度等参数。     

Configuration effect of novel bipolar triazole/carbazole-based host materials on the performance of phosphorescent OLED devices

A series of structurally isomeric carbazole/triazole (TAZ)-based bipolar host materials 1–4 were designed and synthesized. These new materials were found to exhibit wide energy gaps (E_g: 3.29–3.52 eV), high triplet energies (E_T: 2.56–2.76 eV), high thermal stability (T_d: 426–454 °C), high glass-transition temperatures (T_g: 116–156 °C) and excellent film-forming property. Green and blue emitting devices with fac-tris(2-phenylpyridine)iridium (Ir(ppy)₃) and iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-N,C^2′)picolinate (FIrpic) as phosphorescent dopants have been fabricated. The measurements of turn-on voltages, efficiencies and luminance suggested that the practice of combining carbazole’s high triplet energy and excellent hole-transporting ability with TAZ’s electron-transporting ability at the molecular level was effectively translated into better performance at the device level. The molecular structure of compound 4 is well-correlated with its efficiencies, which (32.7 and 21.1 cd/A for green and blue devices, respectively) were the best among the four materials.     

OLED技术的颠覆性创新突破

有源有机发光二极管显示器（AMOLED）在显示和照明领域的潜在颠覆性创新优势已经逐渐被人们所认识。预计AMOLED将带来一次产业创新革命。     

印制电路板高频介电常数测试技术现状分析

在印制电路板的设计、生产等过程中,板材的介电常数和介质损耗角正切都是影响板材应用性能的重要参数,因此,介电常数的测量准确性十分重要。本文介绍了目前使用的几种高频介电常数测量方法的原理、标准和相关产品,并分析了其优势和不足,以及测量技术的发展趋势。     

新一代OLED显示技术

本文介绍了OLED的发展，分析了OLED的结构、工艺和巨大优势，预测了OLED市场的未来。     

OLED技术与市场展望

OLED属于一种崭新的显示器件，它将会对未来的图象显示技术带来无法估量的冲击力！OLED是最有发展前景的显示器件之一，并且将会成为平板显示领域中的一种主流技术，本文阐述OLED诉应用领域、市场前景及发展趋势。     

超大规模集成电路中低介电常数薄膜的制备与检测技术

近年来,低介电常数材料在IC工业中日益受到人们广泛关注,为了降低信号传输延迟和串扰以及由于介电损失而导致的功耗增加,采用低介电常数材料做层间介质是必要的。本文介绍了有关低介电常数材料薄膜的制备方法和基本特性的检测技术。     

FCCL高频介电性能和介电热系数的测量

由于FCCL机械性能特点,FCCL大量用于刚挠结合电路。而应用在FCCL电路的传输频率较低,高频介电性能如介电常数Dk和介电损耗角正切Df未被重视起来。本文利用分离式介质谐振腔法测量FCCL的介电性能,测试频率范围为1.1 GHz~15.5 GHz,并测量其介电常数热系数TCEr。     

交流驱动对有机电致发光器件性能的影响

驱动方式被认为是提高OLED稳定性的最重要因素之一.采用优良的蓝光材料AND并用NPB掺杂,制备了一种蓝光器件.通过对器件加反向电压处理后所表现出来的特性进行研究发现交流负半周期对OLED器件工作性能的提高起着很大的作用.通过对同一器件分别在直流驱动和交流驱动下做寿命测试对比实验,发现在交流驱动下器件的寿命提高很大.     

有机发光显示的几项新技术

有机发光显示(OLED)作为下一代显示器倍受关注。本文简要介绍OLED显示器的几项新技术和制作方法，以及其研究现状和今后的发展趋势。     

Tuning the dielectric constant of polymers using organic dopants

Four different electron-rich organic dopants were added to an unsaturated polyester resin to determine the influence on the rheological properties as well as on the softening and dielectric properties after solidification. While the viscosity is slightly reduced with increasing dopant concentration, which simplifies thin-film formation for the integration in a printed circuit board, as unwished side effect the glass transition temperature of the solid polymer drops also. The aspired increase in the relative constant could be realized, starting with an initial value around 3 the addition of 20 wt% of phenanthrene enabled a value for ε_rel of 5.5 (20 °C, 100 kHz). A rise of the dielectric loss could be observed also.     

Investigation of large-area OLED devices with various grid geometries

Luminance homogeneity is an important aspect for large-area (>1 cm²) organic light emitting diodes (OLED). Especially, high sheet resistances of transparent contacts lead to a significant brightness inhomogeneity caused by a drop of local potential difference. Therefore the implementation of thin low-resistance metallic grids onto transparent contacts is a crucial development aspect for large-area OLED design. We develop a finite-element electro-optical simulation for OLED using grid structures to optimize geometry, thickness and width of grid elements. We find an exponential relationship between luminance homogeneity and grid material volume, which leads to limitations of minimal grid line width and maximal emissive area for efficient development of large-area OLED.