||In this thesis, we studied the photophysical properties and the applications on organic light-emitting devices of bipolar transporting diphenyl ketone and aromatic amine based derivative. The developed materials were then utilized as the host of red phosphorescent devices. Suitable transporting materials and emitting dopant were chosen based on the photophysical and carrier transporting properties of the host materials. Device structures were then carefully designed to optimize the device performance. |
After optimization, the device LHH2 showed 16.2%, 27.6 cd/A, and 36.2 lm/W in EQE, current efficiency and power efficiency; Device LHH3 showed 13%, 17.9 cd/A and 13.9 lm/W in EQE, current efficiency and power efficiency; Device LHH4 showed 10.2%, 20 cd/A, and 26.6 lm/W in EQE, current efficiency and power efficiency. Among them, device LHH2 had the best efficiency due to good energy transfer (photoluminescence quantum yield of the host-guest system was 86%) and balanced ambipolar charge transport. The bipolar transporting diphenyl ketone/aromatic amine derivative were suitable for highly efficient red phosphorescent organic light-emitting devices.
Therefore, this material was suitable for the production of high-efficiency red phosphorescent devices.