Electron transport layer ink-jet printing ink and preparation method thereof

Abstract

The invention provides an electron transport layer ink-jet printing ink and a preparation method thereof. According to the preparation method of the electron transport layer ink-jet printing ink, withan ionic type conjugated polyelectrolyte adopted as a solute and an alcohol compound adopted as a solvent, the ratio, viscosity and surface tension of each component are adjusted, so that the electron transport layer ink-jet printing ink suitable for the ink-jet printing technology can be obtained; and the electron transport layer ink-jet printing ink satisfies the manufacturing process requirements of ink-jet printing, realizes the ink-jet printing type of an electron transport, and can assist in avoiding the mutual solution of the electron transport layer and adjacent structural layers in an OLED preparation process, and realizing full-solution OLED device preparation. The electron transport layer ink-jet printing ink of the invention is prepared by using the above preparation method, satisfies the manufacturing process requirements of the ink-jet printing, realizes the ink-jet printing type of the electron transport, and can assist in realizing the full-solution OLED device preparation.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an electron transport layer inkjet printing ink and a preparation method thereof. Background technique [0002] Organic Light Emitting Display (OLED) has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, wide operating temperature range, and can realize flexible display and With many advantages such as large-area full-color display, it is recognized by the industry as a display device with the most potential for development. [0003] According to the driving method, OLED can be divided into two categories: passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED), namely direct addressing and thin film transistor matrix addressing. Among them, AMOLED has pixels arranged in an array, belongs to the active display type, has high luminous effici...

AI Technical Summary

Problems solved by technology

[0005] At present, the most commonly used preparation methods for OLED devices are: the hole injection layer, the hole transport layer and the light-emitting layer are prepared by ink-jet printing (Ink-Jet Printing), and the electron transport layer and cathode are prepared by vacuum thermal evaporation. The cost of thermal evaporation method is high, resulting in high production cost of OLED devices, which limits the large-scale commercialization of OLED devices

The inkjet printing method uses multiple nozzles to drop functional material ink into a predetermined pixel area, and then obtains the desired film by drying. This method has the advantages of high material utilization and is a key technology to solve the cost problem of large-scale OLED display. However, , due to the mutual dissolution phenomenon between adjacent printing ink layers, and the materials of the electron transport layer and the cathode are mostly evaporated materials, it is difficult to realize the OLED device of the full solution process.

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