Organic electroluminescent device, manufacturing method thereof and display device

Abstract

The invention discloses a manufacturing method of an organic electroluminescent device. The method includes the steps that an auxiliary electrode is formed on a resin layer of an organic electroluminescent substrate; a gas generation layer is formed on the auxiliary electrode; an organic electroluminescent layer is formed on the gas generation layer; an accepter substrate is arranged on the organic electroluminescent layer; an auxiliary electrode area is scanned through laser, so that the gas generation layer is decomposed under laser radiation and releases gas, and accordingly the organic electroluminescent layer of the auxiliary electrode area is transferred to the accepter substrate; the accepter substrate is removed; a cathode is formed on the auxiliary electrode. By means of the new top-emitting OLED device auxiliary electrode manufacturing technology, bad contact between the auxiliary electrode and the cathode can be effectively reduced, the pixel defect caused due to the fact that residues generated after an organic material or the cathode is sintered and melted through laser are transferred to a pixel area in following processes is avoided, quality of the electroluminescent device is improved, and the yield is improved.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to an organic electroluminescence device, a preparation method thereof, and a display device. Background technique [0002] Compared with LCD (Liquid Crystal Display), organic electroluminescent devices (Organic Light-Emitting Diode, OLED) have the advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright colors, light and thin, etc., and are considered to be the next generation display. technology. Existing OLED devices are usually composed of an anode layer, a light-emitting layer and a cathode layer. According to the different light-emitting surfaces, they can be divided into two types: bottom emission and top emission. Because top emission devices can obtain a larger aperture ratio, they have become a research hotspot in recent years. Top-emitting OLEDs require thin cathodes and reflective anodes to increase light transmittance, an...

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Problems solved by technology

[0005] For the upper auxiliary electrode scheme, the color filter substrate and the OLED substrate are pressed together under vacuum, and the conductive layer on the spacer is in contact with the cathode under pressure and deforms. There are two problems: 1. Spacer deformation It may cause the conductive layer to break, and there is a danger of disconnection of the auxiliary electrode and the cathode connection, so the pressing force must be precisely controlled; 2. Since the conductive layer and the cathode contact on the spacer are in surface contact, there is a risk of poor contact

[0006] For the lower auxiliary electrode scheme, in order to solve the risk of poor contact between the auxiliary electrode and the cathode, the auxiliary electrode is made on the non-luminous area on the cathode. This has a problem: through the existing exposure process, the auxiliary electrode can be easily realized. Positioning accuracy is required, but the OLED material is very sensitive to moisture and water vapor, and cannot be compatible with the TFT etching process. On the other hand, the thin cathode metal is also easily over-etched

In this scheme, the carbonization of the OLED layer after laser irradiation is easily transferred to the light-emitting area in the subsequent process, causing pixel defects.

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