Studies On Organic Light-emitting Devices By Graded Doping

Today is the knowledge economy times focusing on information industry. Flat Panel Displays (FPDs) acts as an important interface for mankind obtaining information and its effects are significant more and more. Organic Light-Emitting Devices (OLEDs) is an important member of FPDs. Due to its many merits of light weight, low cost, broad visual angle, high response speed, spontaneous light-emitting, high brightness and efficiency, etc., OLEDs attracts world wide attention in the fields of science and industry. It gradually becomes the international cutting-edge project and the focus of international competition which need the cooperation and research of many intercrossed branch of science, especially in recent over ten years after C. W. Tang reported the high brightness OED at low operating voltage for the first time in 1987. By the use of novel materials, suitable structures and process technologies, and also by the efforts of world known companies, the performances of OLEDs are made significant improvement reaching to the level of commercialization. Although the development of OLEDs is relatively perfect, how to further improve the performances of the devices is also the research focus in the world. So further to understand the light emitting mechanisms of OLEDs and to design reasonable...