分子内扭转诱导双重荧光化合物及其在白光OLED的应用基础研究

针对制约白光OLED技术发展与应用推广的关键问题，即器件结构复杂和成本高，本项目拟研发新型白光OLED材料，即分子内扭转诱导双重荧光（ITIDF）化合物，实现其在单发光层结构的白光OLED中应用。为此，本项目开展以下工作：1）设计合成具有不同分子结构的ITIDF化合物，研究激发态分子扭转反应机制，探讨结构与荧光特性间的关系，指导ITIDF化合物的设计与合成；2）开展ITIDF化合物的分子激发态动力学研究，阐明发光机制，指导ITIDF化合物发光效率的提升；3）基于上述理论，通过薄膜微观形貌观测与光物理测试，研究ITIDF化合物薄膜的荧光特性调控机制，探索有效调控途径，实现薄膜纯白光发射，以其为发光层，借助器件结构设计，最终获得基于单发光层结构的高发光效率（EQE＞5%）高显色指数（CRI＞90）的白光OLED。本项目研究将有助于完善ITIDF研究的理论体系，推动白光OLED相关技术发展。

For improving progress of research and application in white-light OLED, this project will aim at the key problems of white-light OLED, for example, complicated device configuration and expensive product cost. To solve above problems, the intramolecular twisting induced dual fluorescence (ITIDF) compound as novel white-light OLED material will be researched in this project, which will be utilized as single emission layer in white-light OLED eventually. Hence, this project will carry on the following work: 1) The ITIDF compounds with different molecular structures will be designed and prepared; following studying on twisting reaction mechanism of excited molecules, the relationship between molecular structure and fluorescence properties will be discussed, which can guide molecular designing and chemical preparing of ITIDF compounds. 2) The luminous mechanism of ITIDF compounds will be disclosed systematically by dynamics research on excited states molecules, which can act as theoretical direction for raising the luminous efficiency of ITIDF compound. 3) Based on above theory, the regulatory mechanisms of fluorescence properties of ITIDF compound films will be researched and discussed by microscopic morphology observation of films and optical physics measurement; the effective regulatory method will also be acquired, which will realize pure white-light emission of ITIDF compound film; combining with designing in device structure and fabrication of OLED, the white-light OLED with single emission layer based on ITIDF compound will be gained eventually, which will exhibit high luminous efficiency (EQE＞5%) and high color rendering index (CRI＞90). Above all, this project will contribute to construct the theoretical system of ITIDF, and improve related technology of white-light OLED.