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Hole injection layer ink for inkjet printing and application thereof in organic light-emitting display

A hole injection layer, inkjet printing technology, applied in applications, inks, household appliances, etc., can solve the effect of increasing the effective light-emitting area of ​​display panel pixels and panel brightness, and cannot meet the simultaneous matching and impact of printing inks for multiple functional layers. Problems such as the uniformity of the functional layer film, to avoid the coffee ring effect, easy to dry and remove, and high uniformity

Active Publication Date: 2019-04-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Hole injection layer ink for inkjet printing and application thereof in organic light-emitting display
  • Hole injection layer ink for inkjet printing and application thereof in organic light-emitting display
  • Hole injection layer ink for inkjet printing and application thereof in organic light-emitting display

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Embodiment 1

[0081] An inkjet printing hole injection layer ink, the ink is prepared from 97.5% by volume of PEDOT aqueous solution and 2.5% by volume of isopropanol;

[0082] The surface tension of the obtained ink was 51 mN / m.

[0083] The ink can be obtained by mixing and stirring PEDOT aqueous solution and isopropanol evenly.

Embodiment 2

[0085] An inkjet printing hole injection layer ink, the ink is prepared from 95% by volume of PEDOT aqueous solution and 5% by volume of isopropanol;

[0086] The surface tension of the obtained ink was 45 mN / m.

[0087] The ink can be obtained by mixing and stirring PEDOT aqueous solution and isopropanol evenly.

Embodiment 3

[0089] An inkjet printing hole injection layer ink, the ink is prepared from 92.5% by volume of PEDOT aqueous solution and 7.5% by volume of isopropanol;

[0090] The surface tension of the obtained ink was 42 mN / m.

[0091] The ink can be obtained by mixing and stirring PEDOT aqueous solution and isopropanol evenly.

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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 a PEDOT aqueous solution and isopropyl alcohol. The ink is ink-jet-printed into a PEDOT film by an inkjet printer in a region where an organic light-emitting display pixel is formed on a substrate subjected to oxygen plasma treatment or carbontetrafluoride plasma treatment. The composition and preparation method of the PEDOT ink of the invention are simple, the auxiliary solvent has stable performance, low content and strong volatility, and is easy to dry and remove after being printed into a film. Surface roughness and electrical property change of the PEDOT film will not be caused by excessive drying time. The PEDOT film has high uniformity, no obvious thin intermediate and thick edges, and avoids the coffee-ring effect. Moreover, the matching ability between the height of an etched separation pillar and multiple functional layers is improved. The hole injection layer ink 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/30H01L51/50H01L51/54
CPCC09D11/30H10K71/135H10K85/1135H10K50/17
Inventor 郑国强彭忠祥史红辉纪又新刘春太
Owner ZHENGZHOU UNIV
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