有机薄膜材料的电致发光

有机薄膜材料的电致发光具有低压直流驱动、高亮度、高效率、多色、可制成大面积等优点 ,近几年来取得突破性的进展引起了越来越多的关注和兴趣。本文主要介绍了它的发展历程、器件的结构与材料。

ITO在电容式触摸屏中的应用

ITO导电膜是指采用磁控溅射的方法（ITO薄膜的制备方法有蒸发、溅射、反应离子镀、化学气相沉积、热解喷涂等，但使用最多的是反应磁控溅射法），在透明有机薄膜材料上溅射透明氧化铟锡（ITO）导电薄膜镀层并经高温退火处理得到的高技术产品。

以蓝色发光材料DPVBi为基质的白色发光器件

白色有机发光器件是实现彩色平板显示的重要方案之一。利用蓝色发光材料DPVBi[4 ,4′ 二 (2 ,2 -二苯乙烯基 ) 1,1′ 联苯 ]掺杂红光染料DCJTB[4 氰甲烯基 2 叔丁基 6 (1,1,7,7-四甲基久洛尼定基 9 烯炔基 4H 吡喃 ) ]作发光层制备了白色发光器件。研究了DPVBi掺杂不同浓度DCJTB薄膜的光致发光性质 ,根据光致发光结果 ,制备了以DPVBi掺杂不同浓度DCJTB作发光层的电致发光器件 ,其结构为ITO/CuPc/NPB/DPVBi:DCJTB/Alq3 /LiF/Al。当DCJTB质量分数为 0 .0 0 0 8时 ,器件实现了白色发光 (色度x =0 .2 5 ,y=0 .32 ) ,电致发光和光致发光的掺杂比例基本相符 ,表明器件的白色发光主要是由基质DPVBi向掺杂剂DCJTB的能量传递产生的。研究还发现 :白色器件随电压升高 ,光谱中蓝色成分相对于红色成分的比例略有增加 ,文章对此现象进行了分析。该白光器件在 14V时达到最高亮度 782 2cd/cm2 ,在 2 0mA/cm2 电流密度下的亮度为 4 89cd/cm2 ,最大流明效率为 1.75lm/W。

Polarized Electronic Spectra of Organic/Inorganic Hybrid Materials of Chiral Schiff Base Ni（ll） or Cu（ll） Complexes and Disperse Red 1 or Azobenzene in PMMA Films

We have prepared new chiral Schiff base complexes, and copper（Ⅱ） （2） to investigate steric effect of ligands for 1 and bis（N-R-l-phenylethyl-5- methoxysalicydenaminato） nickel（Ⅱ） （1） 2 and known bis（N-R-l-phenylethyl-3,5-dichlorosalicydenaminato） nickel（Ⅱ） （3） and copper（Ⅱ） （4）. By using two kinds of photochromic dyes, disperse red 1 （DRI） and azobenzene （AZ）, we investigated the efficiency of increasing optical anisotropy of organic/inorganic hybrid materials of 1 through 4＋AZ or DRI＋PMMA in polymethylmethacrylate （PMMA） cast films by Weigert effect （and compared with cis-trans isomerization by alternate UV and visible light for 3 and 4 to previous study）. Gradual increase of optical anisotropy was observed for all the hybrid materials regardless of flexibility of Schiff base complexes, and the degree of dichroism and weak intermolecular interactions were discussed based on polarized absorption electronic spectra.

二维共价有机框架的设计、合成与应用

二维材料以其优异的物理化学性能受到人们的广泛关注.二维共价有机框架(2D COFs)是近年来发展的一类通过共价键连接的多孔有机晶体材料.2D COFs材料的多孔性、结晶性及二维方向的π电子共轭体系、层间有序的π-π柱状堆积,赋予了该材料优良的物理化学性质.通过拓扑结构设计和单体选择制备的2D COFs材料具有密度低、结构有序、比表面积大、孔径尺寸和结构可调等特点,并可以通过后合成修饰、孔穴客体填充或负载、材料复合等方式实现对2D COFs材料的功能化.另外,基于表面合成等方法,还可以在一定的基底表面制备出取向、有序的2D COFs单分子层或薄膜.本文综述了2D COFs材料的分子结构设计及功能化,及其在物质吸附储存和输运、催化、能量存储与转化、光电子学等领域的应用.

Mass transport through metal organic framework membranes

Metal-organic frameworks(MOFs), which are composed of metal nodes and organic ligands, possess crystal phase, ordered well-defined porous structure and large surface area. Since first reported in 1990, MOFs have attracted extensive attention and the fabrication of MOF membranes has expanded their applications and endowed them with a bright future in various fields. The mass transportation process through MOF membranes is vital during their diverse applications. In this review, the strategies of preparing continuous and well-intergrown MOF membranes are presented firstly.The selective transportation processes of gas molecules, liquid molecules and ions through MOF membranes are discussed in detail, respectively. The effects of pore entrance size, interaction, functional groups decorating on the ligands and guest components on mass transportation have been summarized in this review as well. In addition, MOF membranes with selective transportation performance demonstrate potential in separation, catalysis, energy transformation and storage devices,and so on.

Preparation and electronic characteristics of anionic perylene bisimide films

Neutral perylene bisimides(PBI) are well-known n-type organic semiconductors, with number of challenging electronic properties in their neutral and reduced states. We report the characteristic electronic properties of PBI anionic films. We unexpectedly discovered that pristine PBI dianion film showed p-type character, while oxidized dianion film(dominant neutral state with few radical anions) showed normal n-type semiconductor character based on Seebeck effect measurements. Both kinds of films exhibit high electrical conductivity with a potential for thermoelectric applications. The mechanism of polarity reversal is proposed.

Experimental and theoretical study of the charge transport property of 4,4′-N,N′-dicarbazole-biphenyl

The hole and electron mobilities of the amorphous films of the organic semiconductor 4,4′-N,N′-dicarbazole-biphenyl (CBP) at different electric fields were measured through the time of flight (TOF) method. Based on its crystalline structure, the hole and electron mobilities of CBP were calculated. A detailed comparison between experimental and theoretical results is necessary for further understanding its charge transport properties. In order to do this, charge mobilities at zero electric field, μ(0), were deduced from experimental data as a link between experimental and theoretical data. It was found that the electron transport of CBP is less affected by traps compared with its hole transport. This unusual phenomenon can be understood through the distributions of frontier molecular orbitals. We showed that designing materials with frontier molecular orbitals localized at the center of the molecule has the potency to reduce the influence of traps on charge transport and provide new insights into designing high mobility charge transport materials.