All-solution oled device and manufacturing method thereof

Abstract

The invention provides an all-solution OLED device and a manufacturing method thereof. The manufacturing method of the full-solution OLED device of the present invention adopts the solution film-forming method to prepare the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer and the cathode, and compared with the manufacturing method of the existing OLED device, realizes the electronic The full solution preparation of the transport layer and cathode can avoid the use of high vacuum evaporation process and equipment, save materials and reduce production costs; and there will be no mutual dissolution between adjacent structural layers, high film quality, and effectively improve device performance. The hole injection layer, the hole transport layer, the light emitting layer, the electron transport layer and the cathode in the full solution OLED device of the present invention are all prepared by a solution film-forming method. Compared with the existing OLED device, the preparation cost is low, and the film-forming High quality with excellent display quality.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an all-solution OLED device and a manufacturing 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 efficiency, and is usual...

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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