Investigation and optimization of the TCTA: TmPyPB-based blue-emitting organic light-emitting diodes with high efficiency

Currently, exciplex-based materials had drawn attention of its potential for efficient electroluminescence or for use as a host. In this study, we use TCTA and TmPyPB to form an exciplex host and FIrpic were used as dopant to emit blue phosphorescent light. The mixed ratio of the host was selected to improve the current efficiency of the device and used various types of data to investigate the most important factors affecting efficiency (such as photoluminescence, single carrier device, and electroluminescence). We found out the ratio 1:2 was the preferable ratio in this study. The devices with mixed ratio 1:2 have pretty high current efficiency (56 cd/A).