高效叠层有机发光二极管及其制备技术

High-Efficiency Tandem Organic Light-Emitting Diodes and Their Fabrication Techniques

有机发光二极管(OLED)是通过有机材料获得电致发光的一种半导体二极管,它可广泛用于新一代信息显示和健康照明。由于OLED是一种电流驱动器件,器件的发光亮度与工作寿命具有相反的变化趋势,因此,OLED的发光亮度和工作寿命一直是其走向市场的主要障碍。为了缓解OLED发光亮度与工作寿命的内在矛盾,人们提出了叠层OLED的器件结构。叠层OLED是通过特殊的内部连接层,把多个有机发光(EL)单元在器件内部进行电学串联而形成的一种新型OLED,它可以同时具备高效率和长寿命的特点。为此,主要基于作者团队的前期工作,重点讨论了叠层OLED的设计原理及其选择内部连接层材料的几个原则;提出了器件性能的优化方法;并介绍了团队在国家"863"计划和国家重点研发计划支持下所进行的OLED生产示范线的设计与制造。最后,对我国OLED技术的产业化发展提出了简要的看法。

Organic light-emitting diode(OLED)is a brand new display and lighting technology,utilizing the electroluminescence(EL)of organic molecules.One of the key issues impeding the commercialization of OLED is its light-emitting efficiency and operational lifetime.A tandem OLED consists of multiple electroluminescence(EL)units,connected by unique intermediate connectors.The current efficiency and lifetime of a tandem OLED with N EL units can be more than N times those of the individual OLED unit.Hence,tandem OLEDs provide a promising approach to fabricate highly efficient and long lifetime displays and solid-state lightings.The charge generation ability and charge injection of the intermediate connector in a tandem OLED determine the performance of the device.Meanwhile,the transparency and the optical path also have an impact on the light output.Therefore,both the electrical and the optical properties of the intermediate connectors should be considered during the design of tandem OLEDs.To capitalize on the advantages of tandem OLEDs,the manufacturing equipment should also be specially designed and developed.Here,we systematically introduce the advantages,design principles,and optimization of tandem OLEDs.Combined with the research and development of manufacturing equipment,we further elaborate the importance and urgency of establishing the OLED product chain in China.