The mechanism of efficiency enhancement with proper thickness of DPVBilayer for blue organic light-emitting devices (BOLED)

摘要

We report on the fabrication of blue organic light-emitting devices (BOLEDs) with structure: ITO/NPB/DPVBi/A1q_3/LiF/Al. The hole-blocking effect in NPB/DPVBi interface was indirectly demonstrated anddeduced by inserting DCJTB layer. In addition, the effect of the device with better J-V characteristicsbecause of the extra DCJTB layer is discussed as well. However, the performance of devices wasinvestigated with various thicknesses of DPVBi layer. The result shows that the device with properthickness of DPVBi layer generating better electron injection enhances efficiency and luminance forBOLED.