A kind of hole injection layer ink for inkjet printing and its application in organic light emitting display

Abstract

The invention discloses a hole injection layer ink for inkjet printing and its application in organic light-emitting display. The ink is prepared by mixing PEDOT aqueous solution and isopropanol. The ink is printed into a PEDOT film by an inkjet printer on the region of the organic light-emitting display pixel on the substrate that has been treated with oxygen plasma and carbon tetrafluoride plasma. The composition and preparation method of the PEDOT ink of the present invention are simple, the performance of the co-solvent is stable, the content is low and the volatility is strong, and it is easy to dry and remove after printing and forming a film, and will not cause rough surface of the PEDOT film and changes in electrical properties due to too long drying time. . The PEDOT film has high uniformity, and there is no obvious phenomenon of being thin in the middle and thick at the edge, which avoids the coffee ring effect. Moreover, the height matching between the etched isolation column and multiple functional layers is improved. It has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of inkjet printing organic light-emitting display. The invention relates to a hole injection layer ink for inkjet printing and its application in organic light-emitting display. Background technique [0002] Organic light-emitting diode display (OLED) has the characteristics of ultra-thin flexibility, wide viewing angle, high contrast ratio, and low energy consumption. It is considered to be the next-generation flat-panel display technology to replace liquid crystal. Inkjet printing organic light-emitting display has low processing cost and high production efficiency, and is recognized by the industry as the most potential mass-production processing technology for high-generation organic light-emitting display panels. [0003] OLEDs generally include: a substrate, an anode on the substrate, a hole injection layer on the anode, a hole transport layer on the hole injection layer, a light-emitting layer on the...

AI Technical Summary

Problems solved by technology

And the height of the isolation column cannot meet the simultaneous matching of printing inks of multiple functional layers at the same time, which will affect the film uniformity of other functional layers

Therefore, in the process of inkjet printing, not only the film thickness of the hole injection layer prepared by inkjet printing ink is not uniform, but also the film thickness of other functional layers is not uniform because the height of the spacers cannot meet multiple functional layers at the same time, further increasing The effect on the effective light-emitting area of ​​display panel pixels and panel brightness

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