Paper EM-ThP21
Dye Doped Red Organic Light-emitting Diode
Thursday, October 18, 2007, 5:30 pm, Room 4C
Full color display is the goal of organic light-emitting diode(OLED), but the making of stable red organic light-emitting diodes is a great barrier in mass production of OLED and is also the most interesting study nowadays. Some red light-emitting diodes have been realized by doping a dye rubrene with different dopant concentrations in light-emitting layers, the configuration of devices is ITO/CuPc/NPB/Alq3:rubrene:DCJTB /Alq3/LiF/ Al, where NPB and Alq3 is used respectively as hole transport layer and electron transport layer. By using the theories of Forster and energy band, it is found that the main energy transfer mechanism in doped red OLED is not Forster energy-transfer but sequential carrier trapping mechanism, and rubrene can assist energy transfer from Alq3 to DCJTB more efficiently, which greatly improves the luminence efficiency and performances of devices.