TWI634685B - Organic light emitting device - Google Patents

Abstract

The invention is an organic light-emitting device, including a substrate, a first electrode, at least one organic material layer, a second electrode and a back cover for packaging in sequence, wherein the first electrode is provided with an auxiliary electrode, and the metal auxiliary electrode An insulating layer is provided, and the organic light-emitting device is a non-light emitting area at the position of the insulating layer, and the rest is a light emitting area, and a spacer element is aligned on the back cover to the non-light emitting area, so that the organic light emitting device is packaged after The buffering effect of the spacer element prevents external force from squeezing the organic light-emitting device, and solves the problem of short circuit between the first electrode and the second electrode due to external force crushing.

Description

Organic light emitting device

The invention relates to a light-emitting device, especially a light-emitting device made of organic light-emitting materials.

The existing organic light-emitting device includes a substrate, an auxiliary electrode, an insulating layer, a first electrode (generally an anode), an organic material layer, and a second electrode (generally a cathode). The auxiliary electrode is electrically connected to the first electrode, and the auxiliary electrodes communicate with each other. The impedance and current drop of the first electrode are reduced by the action of the auxiliary electrode when energized, so that the brightness uniformity of the organic light-emitting device is improved to a certain extent .

However, when the back cover is pressed and packaged, the external force applied by pressing the back cover may cause the first electrode and the second electrode to contact with each other, resulting in the occurrence of the gap between the first electrode and the second electrode The short circuit phenomenon, in turn, causes the entire organic light-emitting device not to emit light, or most of the areas do not emit light, or a bad point that is lower than the average emission brightness.

In response to the above-mentioned problems, many companies or research institutions in related fields have proposed various solutions to solve this problem. For LG Chem., LTD, at least US Patent US9209421 has been applied for. , Chinese patent CN103959504A, etc., its main solution is that the first electrode is provided with a spacer element in the grid space surrounded by the auxiliary electrode, so that it can solve the problem caused by the contact between the first electrode and the second electrode Short circuit problem, but the spacer element will not emit light, which means that the organic The area where the optical device does not emit light reduces the overall luminous efficiency of the organic light-emitting device. In addition, since the spacer element is also provided with an organic material layer, a second electrode layer, an insulating layer and other materials, it is bound to be around the spacer element Increase the amount of materials used in the organic material layer, the second electrode layer and the insulating layer.

In addition, US Patent Publication No. 20060290276A1 applied by Eastman Kodak Company is provided with a color filter element as a spacer element in the gap between the back cover and the second electrode However, on the back cover, two more procedures are required to set the filter element to form the spacer element, which not only increases the manufacturing time, but also increases the difficulty in the manufacturing process.

In summary, how to provide a spacer element on the organic light-emitting device to avoid reducing the light-emitting area and reduce the luminous efficiency, and can use a more convenient and easy way to set the spacer element to solve the problem that the first electrode and the second electrode contact each other The short circuit problem is a problem that needs to be solved urgently.

In view of the problems derived from the above-mentioned conventional technology, the main objective of the present invention is to solve the problem of the organic light-emitting device between the first electrode and the second electrode without increasing the manufacturing cost and avoiding the reduction of the light-emitting area and the light-emitting efficiency. Short circuit problem.

According to the object of the present invention, there is provided an organic light-emitting device including a substrate, an auxiliary electrode, an insulating layer, a first electrode, an organic material layer, a second electrode, and a back cover, wherein the auxiliary electrode is provided between the substrate and the first electrode Between the first electrode and the organic material layer, the insulating layer covers the auxiliary electrode, and the organic light-emitting device is a non-light emitting area at the position of the insulating layer, and the remaining part is the light emitting area, between the back cover and the second electrode A spacer element is arranged on the non-light emitting area, so that After the packaging of the organic light-emitting device is completed, the buffering effect of the spacer element prevents the external force from squeezing the organic light-emitting device, and solves the problem of short circuit between the first electrode and the second electrode due to external force.

Wherein, the spacing element is arranged at the position where the back cover faces the second electrode, and the height of the spacing element is 1 to 10 μm, the diameter is 5 to 10 μm, and the average distance between the spacing elements is greater than 100 μm.

Wherein, the spacing element may be a transparent or light-absorbing material, or particles with moisture or oxygen absorption, or particles with light scattering.

According to the above, the present invention has one or more of the following advantages:

1. The spacing element is provided at a position of the organic light-emitting device relative to the insulating layer, and there is no light source at this position, therefore, the luminous efficiency of the organic light-emitting device of the present invention is not impaired.

2. The spacing element is provided between the back cover and the second electrode, which solves the problem that the traditional organic light-emitting device increases the amount of materials used for the organic material layer, the second electrode layer, and the insulating layer.

3. The spacing element is arranged at the position where the back cover or the second electrode is aligned with the non-light emitting area, and will not increase the manufacturing difficulty, nor will the manufacturing time be longer than the traditional organic light emitting device, which will effectively reduce the production cost.

1‧‧‧ Base material

2‧‧‧First electrode

3‧‧‧ organic material layer

4‧‧‧Second electrode

5‧‧‧Back cover

6‧‧‧Auxiliary electrode

7‧‧‧Insulation

70‧‧‧Lighting area

72‧‧‧non-luminous area

8‧‧‧Spacer

FIG. 1 is a layout diagram of an embodiment of the invention.

Fig. 2 is a schematic sectional view taken along line A-A 'of Fig. 1.

The spirit of the present invention will be illustrated in the following figures and in detail. Anyone who has ordinary knowledge in the technical field after understanding the preferred embodiments of the present invention can change and modify the techniques taught by the present invention without departing from it. The spirit and scope of the present invention.

Please refer to FIGS. 1-2, the present invention is an organic light-emitting device, including a substrate 1, a first electrode 2, an organic material layer 3, a second electrode 4 and a back cover 5, the first electrode 2 and the organic material An auxiliary electrode 6 is provided between the layers 3, and an insulating layer 7 is provided at a position of the auxiliary electrode 6 facing the organic material layer 3 to isolate the auxiliary electrode 6 from electrically conducting with the organic material layer 3, and the organic light emitting device has a light emitting region 70 And the non-light-emitting area 72, wherein the non-light-emitting area 72 is the portion of the insulating layer 7 on the auxiliary electrode 6, and the remaining portion is the light-emitting area 70, and is aligned between the back cover 5 and the second electrode 4 in the non-light-emitting area 72 A plurality of spacer elements 8 make the organic light-emitting device complete the packaging, by the buffering effect of the spacer element 8, to avoid external force squeezing the organic light-emitting device, to solve the short circuit between the first electrode 2 and the second electrode 4 due to external force crush The problem.

In the present invention, the spacer element 8 is provided at the position where the back cover 5 faces the second electrode 4 (as shown in FIG. 2), the spacer element 8 has a height of 1 to 10 μm and a diameter of 5 to 10 μm The average distance between adjacent spacer elements 8 is greater than 100 μm. The spacer elements 8 may be light-transmissive or light-absorbing materials, or particles with moisture, oxygen, or light scattering particles. The material or particles of the element 8 include glass, silicon dioxide, polymer, ceramic or photoresist. In addition, the spacing element 8 may have a regular or irregular shape or a geometric shape, and the spacing element 8 further has a hemispherical shape, a pyramid shape, a cubic shape, or a prismatic shape, but is not limited thereto.

In the present invention, the first electrode 2 includes one or more selected from indium tin oxide (ITO indium zinc oxide (IZO) or aluminum zinc oxide (AZO) and tin dioxide (SnO ₂ ), and the second electrode 4 includes one or more selected from the group consisting of aluminum (Al), silver (Ag), calcium (Ca), magnesium (Mg), gold (Au), molybdenum (Mo), chromium (Cr) and their alloys , And the organic light-emitting device may be a flexible organic light-emitting device.

In the present invention, the back cover 5 is selected from glass, silicon dioxide (SiO ₂ ), polyethylene terephthalate (PET), polycarbonate (PC), polyimide (PI), polynaphthalene One of ethylene glycol dicarboxylate (PEN).

In the present invention, the organic light-emitting device is applied to an organic light-emitting diode display device or an organic light-emitting diode lighting device as an element that provides a light source required for the display device or the lighting device.

In the foregoing, since the spacer element 8 is provided in the non-light emitting region 72 of the organic light emitting device, this position does not originally have a light source in the conventional organic light emitting device, so the luminous efficiency of the organic light emitting device of the present invention is not reduced. In addition, the spacer element 8 is provided at a position where the back cover 5 faces the second electrode 4 or between the second electrode 4 facing the back cover 5, therefore, to solve the conventional organic light-emitting device, an organic material layer, a second electrode layer and insulation are added Problems with the amount of material used in the layer. In addition, the spacing element 8 is provided at the position of the back cover 5 or the second electrode 4 relative to the non-light emitting area, which will not increase the manufacturing difficulty and the manufacturing time will not be longer than that of the conventional organic light emitting device, which will effectively reduce the production cost.

In summary, this case is not only innovative in terms of technical ideas, but also possesses the above-mentioned multiple effects that traditional methods do not match. It has fully met the requirements of novelty and progressive legal invention patents. Approve this application for an invention patent to encourage the invention and feel good.

Claims (15)

An organic light-emitting device, including: a substrate, a first electrode, one or more organic material layers, a second electrode and a back cover, characterized in that: an auxiliary electrode is provided on the first electrode; and the The auxiliary electrode is provided with an insulating layer, the portion of the organic light-emitting device opposite to the insulating layer is a non-light emitting area, and the rest is a light emitting area; wherein the back cover is encapsulated on the second electrode, There is a gap between the electrodes, and a plurality of spacing elements are provided at the position of the back cover corresponding to the non-light emitting area, where the spacing element is a light-transmitting material. The organic light-emitting device according to claim 1, wherein the height of the spacer element is 1 to 10 μm. The organic light-emitting device according to claim 1, wherein the diameter of the spacer element is 5 to 10 μm. The organic light-emitting device according to claim 1, wherein the average distance between any two adjacent spacer elements is greater than 100 μm. The organic light-emitting device according to claim 1, wherein the spacer element is a material that absorbs the light source. The organic light-emitting device according to claim 1, wherein the spacer element is a particle having moisture and oxygen absorption. The organic light-emitting device according to claim 1, wherein the spacer element is a particle with light scattering. The organic light-emitting device according to claim 1, wherein the spacer element has a hemispherical shape, a pyramid shape, a cubic shape, or a prismatic shape. The organic light-emitting device according to claim 1, wherein the spacer element is made of glass, silicon dioxide, polymer, ceramic or photoresist material. The organic light-emitting device according to claim 1, wherein the first electrode comprises an indium tin oxide (ITO), indium zinc oxide (IZO) or aluminum zinc oxide (AZO), and tin dioxide (SnO ₂ ) One or more of them. The organic light-emitting device according to claim 1, wherein the second electrode includes a material selected from the group consisting of aluminum (Al), silver (Ag), calcium (Ca), magnesium (Mg), gold (Au), molybdenum (Mo), and chromium One or a combination of any two or more selected from (Cr) and its alloy composition. The organic light-emitting device according to claim 1, wherein the organic light-emitting device may be a flexible organic light-emitting device. The organic light-emitting device according to claim 1, wherein the back cover is selected from glass, silicon dioxide (SiO ₂ ), polyethylene terephthalate (PET), polycarbonate (PC), polyimide One of amine (PI) and polyethylene naphthalate (PEN). An organic light-emitting diode display device comprising the organic light-emitting device according to any one of claims 1 to 13. An organic light-emitting diode lighting device comprising the organic light-emitting device according to any one of claims 1 to 13.