Modulation of n-Type Units in Bipolar Host Materials toward High-Performance Phosphorescent OLEDs.

@article{Wang2017ModulationON,
  title={Modulation of n-Type Units in Bipolar Host Materials toward High-Performance Phosphorescent OLEDs.},
  author={Fang Wang and Di Liu and Jiuyan Li and Mengyao Ma},
  journal={ACS applied materials & interfaces},
  year={2017},
  volume={9 43},
  pages={
          37888-37897
        }
}
9'-Pyridinyl-9'H-9,3':6',9″-tercarbazole (PyCz) is a bipolar host material in phosphorescent organic light-emitting diodes (PhOLEDs). A second n-type unit, either pyridine or diphenylphosphine dioxide (DPPO), is introduced onto the pyridine ring of PyCz at para- or metasite to design and prepare four novel "dual n-type unit bipolar host" materials m-BPyCz, p-BPyCz, m-POPyCz, and p-POPyCz. The incorporation of the second n-type unit pulls down the lowest unoccupied molecular orbitals and… CONTINUE READING