研究目的
To achieve comparable device efficiency to phosphorescent devices for all-fluorescent white organic light-emitting diodes (WOLEDs) by incorporating a novel yellow fluorophor in co-doping forming blue exciplex.
研究成果
The study successfully demonstrates high-performance all-fluorescent WOLEDs with EQE exceeding the theoretical limit of 5%, achieved by incorporating a novel yellow fluorophor in a blue-emitting TADF host. The optimized device shows maximum current efficiency, power efficiency, and EQE of 20.78 cd/A, 24.25 lm/W, and 8.22%, respectively, indicating significant potential for applications in display and lighting industries.
研究不足
The study does not explicitly mention limitations, but potential areas for optimization could include further improving the efficiency roll-off at high luminance and exploring the scalability of the fabrication process.
1：Experimental Design and Method Selection
The study employs a novel yellow fluorophor (Y) doped in a blue-emitting thermally activated delayed fluorescent (TADF) host of mCP:PO-T2T-forming exciplex to fabricate all-fluorescent WOLEDs. The white emission is realized through the combination of blue and yellow emissions from the host and emitter Y via incomplete energy transfer.
2：Sample Selection and Data Sources
The yellow fluorophor Y was synthesized by the authors' group. Other materials were commercially sourced and used without further purification.
3：List of Experimental Equipment and Materials
Materials include ITO substrates, MoO3, LiF, Al, mCP, PO-T2T, and the novel yellow emitter Y. Equipment includes a vacuum chamber for film deposition, Keithley 2400 source, BM-70A luminance meter, and PR-655 spectra scan spectrometer.
4：Experimental Procedures and Operational Workflow
The ITO substrates were cleaned and treated with ultraviolet-ozone. Organic films were deposited using thermal evaporation technology under a base pressure of ≤ 5×10-4 Pa. The deposition rates and film thickness were monitored and controlled. The EL spectra, CIE coordinates, J-V-L characteristics, CE, and PE were measured using specified equipment.
5：Data Analysis Methods
The EQE was calculated from the J?V?L curve and spectra data. The performance of the devices was analyzed based on luminance, current efficiency, power efficiency, and EQE.
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