研究目的
To realize low voltage red phosphorescence EL devices by designing double-EMLs device structure with well-matched energy levels.
研究成果
The study successfully demonstrated an efficient device design strategy to realize low voltage red phosphorescence EL devices by designing double-EMLs device structure with well-matched energy levels. The optimal device achieved high brightness, current efficiency, and power efficiency with very low operation voltage.
研究不足
The study focuses on the optimization of device structures for red phosphorescent OLEDs, and the findings may not be directly applicable to other types of OLEDs or different emission colors.
1：Experimental Design and Method Selection:
The study involved designing OLEDs with single- or double-EML(s) using PQ2Ir(dpm) as the emitter and selecting BUPH1 and TcTa as host materials for the EMLs. The device structure was optimized for improved carriers' balance and broadening recombination zone.
2：Sample Selection and Data Sources:
ITO coated glass with a sheet resistance of 10 Ω sq-1 was used as the anode substrate. All organic materials were obtained commercially and used as received.
3：List of Experimental Equipment and Materials:
The study used a Brightness Light Distribution Characteristics Measurement System C9920-11 for J-B-V characteristics and EQE measurements, and a Hitachi F-7000 fluorescence spectrophotometer and an Ocean Optics spectrophotometer for EL spectra measurements.
4：Experimental Procedures and Operational Workflow:
Organic layers were deposited under high vacuum. EMLs were prepared by co-evaporating PQ2Ir(dpm) and host material from two individual sources. LiF and Al were deposited in another vacuum chamber.
5：Data Analysis Methods:
The current density-brightness-voltage characteristics and the EQE of the EL device were measured. The EL spectra were measured with calibrated spectrophotometers.
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