研究目的
To develop high-performance white organic light-emitting diodes (WOLEDs) with doping-free device architecture based on exciton adjusting interfacial exciplex for simplified fabrication procedures and reduced costs.
研究成果
High-performance two-color and three-color WOLEDs with doping-free structure have been achieved based on interfacial exciplex. The management of interfacial exciplex is an effective avenue to develop high-performance doping-free WOLEDs for commercial lighting and display applications.
研究不足
The narrow exciton recombination zone and unbalanced carrier transport in doping-free WOLEDs could result in serious exciton quenching, leading to low efficiency and poor efficiency roll-off.
1：Experimental Design and Method Selection:
The study utilized interfacial exciplex with high triplet energy level (T1) constructed by an electron-transporting material PO-T2T and a bipolar material 26DCzPPy. The methodology involved optimizing the donor and acceptor thickness to manage exciton distribution and reduce local exciton density.
2：Sample Selection and Data Sources:
The materials used included di-[4-(N,N-ditolyl-amino)-phenyl]cyclohexane (TAPC), 1-bis[4-[N,N-di(4-tolyl)amino]phenyl]-cyclohexane (HAT-CN), and various phosphorescent dopants such as FIrpic, Ir(ppy)2acac, Ir(tptpy)2acac, and Ir(MDQ)2acac.
3：List of Experimental Equipment and Materials:
Equipment included a Shimadzu UV-2600 spectrophotometer for UV?vis absorption spectra, a fluorescence spectroscopy (Edinburg FLS980) for PL spectra, and a Keithley 2400 source meter linked with a light intensity meter LS-110 for current density and luminance versus voltage characteristics.
4：Experimental Procedures and Operational Workflow:
The devices were fabricated under vacuum deposition, with organic layers and Al deposited at specified rates. The effective emission area of devices was 4 mm × 4 mm.
5：Data Analysis Methods:
EL spectra were tested by a PR650 spectrometer, and EQEs were calculated from the luminance, current density, and EL spectra under the supposition of Lambertian distribution.
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