研究目的
Investigating the use of selenium in metal-free organic phosphors to achieve room-temperature phosphorescence and high external quantum efficiency in OLEDs.
研究成果
The study successfully demonstrated the use of selenium in metal-free organic phosphors to achieve room-temperature phosphorescence and high external quantum efficiency in OLEDs. The PSe1 emitter showed a high PL quantum yield and EQE, opening a new way for developing high-EQE POPLEDs.
研究不足
The study focuses on the photophysical properties and device performance of Se-based organic phosphors. Limitations include the need for further optimization of molecular structures to shorten triplet lifetimes and improve efficiency roll-off at high current densities.
1：Experimental Design and Method Selection:
The study involved the synthesis of Se-based organic phosphors and their characterization through photophysical measurements and device fabrication. Theoretical investigations using density function theory (DFT) and time-dependent DFT (TD-DFT) were conducted to understand the photophysical properties.
2：Sample Selection and Data Sources:
Three emitters, PSe1, PSe2, and PSe3, were synthesized and characterized. Photophysical properties were measured in solution and film states.
3：List of Experimental Equipment and Materials:
Equipment included a fluorescence lifetime spectrometer, absolute PL quantum yield measurement system, high-performance liquid chromatograph, high-resolution mass spectrometer, and elemental analyzer. Materials included sodium t-butoxide, palladium acetate, tri-tert-butylphosphine, toluene, and chloroform-d
4：Experimental Procedures and Operational Workflow:
The synthesis of emitters was followed by photophysical characterization and device fabrication. Devices were fabricated on indium tin oxide substrates with specific layer structures.
5：Data Analysis Methods:
Data analysis involved computational studies to investigate potential channels for efficient phosphorescence and the effect of Se on spin-orbit coupling of the emitters.
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