研究目的
Investigating the correlation between roll-off phenomena and carrier injections for inverted type OLEDs as compared with conventional OLED.
研究成果
HAT-CN was a better hole injection material than MoOx, enhancing electron injection from ITO/PEI and improving EL efficiency. The roll-off phenomenon in OLEDs is related to carrier injections, with good carrier injections improving EL efficiency and delaying the roll-off.
研究不足
The study focuses on Alq3-based OLEDs and may not be directly applicable to other materials. The exact mechanisms behind the roll-off phenomena and carrier injections require further investigation.
1：Experimental Design and Method Selection:
The study compares the electrical conduction and EL efficiency of inverted OLEDs with PEI/ITO cathode using HAT-CN and MoOx as hole injection materials.
2：Sample Selection and Data Sources:
Inverted OLEDs with different hole injection layers (HAT-CN and MoOx) were fabricated.
3：List of Experimental Equipment and Materials:
Polyethyleneimine (PEI) as an electron injection layer, HAT-CN and MoOx as hole injection layers, and vacuum deposition for layer fabrication.
4：Experimental Procedures and Operational Workflow:
Fabrication of device structures by vacuum deposition, measurement of current density-voltage characteristics with luminance, and EL efficiency-current density characteristics.
5：Data Analysis Methods:
Analysis of EL efficiency roll-off phenomena and correlation with carrier injections.
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