Study On Improving The Efficiency And Stability Of Organic Light-emitting Devices

Up to date, Flat Panel Displays (FPDs) are playing important roles for mankind to get information and their effects are significant. Organic light-emitting devices (OLEDs) are important members of FPDs and attract world wide attention in the fields of science and industry due to their many merits of light weight, low cost, broad visual angle, high response speed, spontaneous light-emitting, high brightness and efficiency, etc. Since C. W. Tang and et al. report the high brightness OLEDs at low operating voltage for the first time in 1987, many progress have been made. By the use of novel materials, suitable structures and the efforts of world-known companies, OELDs are being moved out of the laboratory and made into commodities. Although the performances of some OLEDs are high, further improving the performances of OLEDs is still the research focus in the world.In this thesis, we have made some meaningful works relating to the improving efficiency of OLEDs and the degradation mechanism of OLEDs.1. Time-resolved photoluminescence spectra are firstly used to study the energy transfer processes in the co-doped organic red light-emitting devices.The energy transfer rates from Alq3 to DCJTB, from Alq3 to rubrene, and from rubrene to DCJTB are proximately calculated to be 1.04×109 s-1, 3.89×...