Organic electro luminescence device and its manufacturing method

Abstract

In the invention, isolation column in double layer is prepared on graphics of first electrode. Cross section of lines on the second layer in the isolation column possesses shape of big in top and small in bottom, and its bevel edge possesses two adductive angle alpha, beta, and alpha>beta. Then, organic functional layer and second electrode are deposited in sequence. Angle beta on bevel edge increases tolerance for angle and width of coating by vaporization of metal back electrode. Different angles of coating by vaporization realize full covering organic functional layer, which is easier eroded by water and oxygen then electrode, by the back electrode so as to prevent organic functional layer from exposing out of the back electrode. The isolation column is prepared through twice coating organic thin films, twice exposures and one time of hot setting. The invention raises service time and even luminescence of parts.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a preparation method of the device, belonging to the technical field of electronic semiconductor components. Background technique [0002] Organic Electroluminescent Devices (Organic Electroluminescent Devices, hereinafter referred to as OLEDs) are generally composed of a transparent first electrode located on a transparent substrate, an organic electroluminescent medium (organic functional layer) deposited on the first electrode, and an organic electroluminescent medium (organic functional layer) located on the transparent substrate. The second electrode (metal electrode) above the organic electroluminescence medium. The transparent electrode serves as the anode of the device, and the metal electrode serves as the cathode of the device. Apply a high level to the transparent electrode and a low level to the metal electrode to make the device emit light. A group of anodes (or cathodes)...

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Problems solved by technology

[0004] ① The baking temperature of the photoresist (such as 120°C) will damage the organic film;

[0005] ② Solvents, developers, and corrosive solutions of photoresist will damage the organic film;

[0009] (1) The spacer column 4 is made of a layer of insulating material. The cross section of the line 4 has an inverted trapezoidal shape with a large top and a small bottom. After the organic functional layer 5 and the metal layer 6 are deposited, part of the metal layer 6 may go over The organic layer 5 falls on the transparent conductive film 2 (as shown in FIG. 2 ) between the bottom of the single-layer spacer column 4 and the organic layer 5, causing the pixel to be short-circuited and not to emit light;

[0010] (2) The single-layer spacer column 4 can only be distributed parallel to the direction perpendicular to the transparent electrode 2, which reduces the reverse suppression voltage between the metal lines while separating the metal electrodes 6, but cannot reduce the voltage between the first transparent electrodes 2. The reverse suppression voltage between them makes the power consumption of the device higher;

[0011] (3) Doping black dye in the spacer material can improve the contrast when the device emits light, because the single-layer spacer 4 is only distributed parallel to the direction perpendicular to the transparent electrode 2, but not in the direction parallel to the transparent electrode 2 Parallel distribution, so the contrast of the device cannot be significantly improved

[0013] ① Form the pattern of the insulating base 3 first, and then form the pattern of the upper layer of cathode partition wall 4 in the same way. The process is complicated and there are many processes, and the surface of the first electrode in the light-emitting area of ​​the device is polluted by two layers of photoresist successively. It is not conducive to the improvement of the overall performance and yield of the device;

[0014] ②The cross-section of the cathode partition wall 4 is an inverted trapezoidal shape with a large top and a small bottom. Due to the limitation of the inclination angle of the inverted trapezoid, only by vertically evaporating the organic functional layer and obliquely evaporating the metal layer can the metal layer completely cover the organic functional layer. edge, but the evaporation angle of the organic functional layer is about 70° to make the organic thin film have better uniformity, and the shape of the cross section of the cathode partition wall 4 cannot ensure the uniformity of the evaporation of the organic functional layer and the complete coverage of the metal layer at the same time. The purpose of covering the edge of the organic functional layer, it can be said that the isolation effect of this kind of cathode partition wall 4 is poor, and it is not optimized enough.

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