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Development of High-performance Organic Electroluminescent Devices Using Amorphous Molecular Materials

利用非晶分子材料开发高性能有机电致发光器件

基本信息

批准号：
06555261
负责人：
SHIROTA Yasuhiko
金额：
$ 3.78万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Organic electroluminescent (EL) devices have received attention because of potential application to full color flat panel displays. There have been extensive studies on layred organic EL devices with the aim of achieving high brightness and multicolor emission. However, improvement in the luminance efficiency and durability of devices remains to be solved.We have been studying the synthesis, properties and applications of photo- and electro-active amorphous molecular materials which form readily amorphous glasses above room temperature. It is expected that the amorphous molecular materials function as hole transport materials of organic EL devices since they form stable amorphous film and exhibit relatively high hole drift mobility.In the present study, (1) we have designed and synthesized novel pi-electron starburst molecules and investigated the relationship between molecular structure and the ease of glass formation, glass stability, and glass-transition temperature, (2) we have investigated the hole transport properties of molecular glasses, and (3) we have fabricated layred organic EL devices using amorphous molecular materials as hole transport layr and found that the device exhibit significant durability. In addition, EL devices consisting of double hole transport layrs exhibits a high luminance efficiency. These results provide the novel strategy for developing organic EL devices with high stability and high luminance efficiency using amorphous molecular materials.

有机电致发光（EL）器件由于在全色平板显示器中的潜在应用而受到关注。已经对分层有机EL器件进行了广泛的研究，目的是实现高亮度和高发光。然而，提高发光效率和器件的耐久性仍然有待解决。我们一直在研究光电活性非晶分子材料的合成，性能和应用，这些材料在室温以上容易形成非晶玻璃。本论文的主要工作包括：（1）设计合成了具有π电子结构的新型星暴型分子，研究了分子结构与玻璃化形成难易程度、玻璃化稳定性和玻璃化转变温度之间的关系;（2）研究了分子玻璃的空穴输运性质;（3）用非晶态分子材料作为空穴输运层制备了层状有机电致发光器件，发现器件具有显著的耐久性。此外，由双空穴传输层组成的EL器件表现出高的发光效率。这些结果为利用非晶态分子材料开发高稳定性和高发光效率的有机电致发光器件提供了新的策略。