研究目的
To develop soluble hole injection materials and inks, named ELsource, for use as a hole injection layer in organic light-emitting diode (OLED) displays, focusing on optical properties necessary for an optical device.
研究成果
Developed soluble HIMs with different refractive indices showed promising device performance in BE-hybrid and printable OLED devices. Excellent film thickness profiles and high adhesion to ITO were achieved, indicating potential for improving reliability and durability of flexible OLED displays.
研究不足
Further improvement of extinction coefficient is required for HIL applicable to TE-OLED display. The film thickness dependence of current density for some HIMs needs improvement.
1：Experimental Design and Method Selection:
Developed soluble hole injection materials (HIMs) with different refractive indices for application in TE-OLED displays.
2：Sample Selection and Data Sources:
Prepared inks A, B, and C by dissolving HIM1, HIM2, and HIM3 in optimized organic solvent compositions.
3：List of Experimental Equipment and Materials:
Used spectroscopic ellipsometer made by J. A. Woollam Japan for measuring refractive indices and extinction coefficients.
4：Experimental Procedures and Operational Workflow:
Formed films A, B, and C by spin coating inks A, B, and C on quartz substrate, followed by baking. Measured optical properties and fabricated OLED devices to evaluate performance.
5：Data Analysis Methods:
Analyzed current density-voltage characteristics, device performance, and lifetime of OLED devices.
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