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Creation of Molecular Glasses and Elucidation of the Relationship between Structures, and Properties and Functions

分子玻璃的创造以及结构、性质和功能之间关系的阐明

基本信息

批准号：
08454224
负责人：
SHIROTA Yasuhiko
金额：
$ 4.67万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

For the purpose of creating molecular glasses, novel pi-electron starburst molecules and other pi-electron systems were designed and synthesized. They were found to readily form stable amorphous glasses with relatively high glass-transition temperatures. The relationship between molecular structures and glass-forming properties, and the stability and glass-transition temperature was investigated. X-Ray crystal structure analyzes of several compounds which form amorphous glasses provided information on the relationship between molecular structure and glass-forming property.Charge transport in the molecular glass was investigated. Hole drift mobilities of several molecular glasses were determined and temperature and electric-field dependences of the hole drift mobility in the molecular glass were analyzed. As a result, valuable information on the relationship between molecular structure and charge transport properties was obtained. In addition, negative-electric field dependence of hole drift mobility was observed for the first time for the molecular glass.Photochromism of an azobenzene derivative dispersed in a molecular glass was investigated in comparison with that dispersed in polystirene. In addition, positron annihilation lifetime in the molecular glass was determined. The results suggested that the local free volume in the molecular glass is smaller than that in polymer glasses.Organic electroluminescent devices using molecular glasses were fabricated and their performances were investigated. Exciplex formation at the interface between hole- and electron-transport layrs was studied. It was shown that the emission color the device can be turned by using the exciplex emission.

为了制作分子玻璃，人们设计和合成了新型的pi电子星暴分子和其他的pi电子系统。发现它们很容易形成稳定的无定形玻璃，玻璃化转变温度相对较高。研究了分子结构与玻璃形成性能、稳定性和玻璃化转变温度之间的关系。对形成非晶态玻璃的几种化合物进行了X射线晶体结构分析，揭示了分子结构与玻璃形成性能之间的关系。测定了几种分子玻璃的空穴漂移迁移率，分析了温度和电场对分子玻璃空穴漂移迁移率的影响。结果，获得了关于分子结构与电荷输运性质之间关系的有价值的信息。此外，首次观察到分子玻璃的空穴漂移与负电场的关系。研究了偶氮苯衍生物在分子玻璃中的光致变色性能，并与分散在聚苯乙烯中的光致变色性能进行了比较。此外，还测定了分子玻璃中的正电子湮没寿命。结果表明，分子玻璃中的局部自由体积小于聚合物玻璃中的局部自由体积。制备了分子玻璃有机电致发光器件，并对其性能进行了研究。研究了空穴传输层和电子传输层界面上激基缔合物的形成。结果表明，利用激基络合物发射可以改变器件的发射颜色。