NPB-based single layer OLEDs

摘要

We use N,N'-diphenyl-N,N'-bis (1-naphthyl) (1,1'-biphenyl)- 4,4'diamine (NPB) simultaneously as the hole transporting (HT), the electron transporting (ET) and the light emitting (EM) layer in organic light-emitting diode (OLED). A single-layer NPB device, which was found to emit blue light with a luminance of 66cd/m~2 and a current efficiency of 0.1cd/A at 80mA/cm~2 was fabricated. By doping the NPB layer with a blue dopant, perylene, the luminance and the current efficiency have been improved enormously to 536 cd/m~2 and 0.7cd/A respectively at 80mA/cm~2.