CN100542363C - Organic light emitting device and electrode substrate - Google Patents

Abstract

An organic light emitting device sequentially comprises a substrate, an auxiliary electrode, an insulating layer, a first electrode, at least one organic functional layer and a second electrode; wherein at least a portion of the second electrode is directly bonded to the auxiliary electrode.

Description

Organic light-emitting device and electrode substrate

technical field

The invention relates to a light-emitting device and an electrode substrate, in particular to an organic light-emitting device and an electrode substrate that emit light from a top surface.

Background technique

Organic Light Emitting Device (Organic Electroluminescent Device) is a device that uses the self-luminous properties of organic functional materials to achieve display effects. It can be divided into small molecule organic light emitting devices (OLEDs) according to the molecular weight of organic functional materials. Small molecule OLED, SM-OLED) and polymer light-emitting device (polymer light-emitting device, PLED) two categories. Due to the advantages of self-illumination, no viewing angle, power saving, easy manufacturing process, low cost, high response speed and full color, organic light-emitting devices have great application potential and are expected to become the next generation of flat-panel displays.

Please refer to FIG. 1 , the conventional organic light emitting device 1 includes a substrate 11 , a first electrode 12 , an organic functional layer 13 , a second electrode 14 and an auxiliary electrode 15 . When a direct current is applied to the organic light-emitting device 1, holes and electrons are respectively injected into the organic functional layer 13 from the first electrode 12 and the second electrode 14. At this time, due to the potential difference caused by the external electric field, the carrier Move and meet in the organic functional layer 13 to generate recombination, and the excitons (exciton) generated by the combination of electrons and holes can excite the luminescent molecules in the organic functional layer 13, and then the luminescent molecules in the excited state are released in the form of light out energy. Here, the luminous chromaticity of the organic functional layer 13 is different according to the energy level difference between the ground state and the excited state of the material. In addition, the auxiliary electrode 15 is provided to increase the conductivity of the second electrode 14 .

以增加透光的效率。然而，当第二电极14的厚度小于

时，容易产生不连续的电极表面，而导致第二电极14的电阻值升高以及电子注入效率的下降。为解决此一问题，目前的技术是藉助辅助电极15以提高第二电极14的导电效率以及降低有机发光装置1的操作电压值。然而，目前的解决方法具有下列两项缺点：(1)由于有机发光装置1为顶面发光，所以设置于顶面的辅助电极15会降低画素的开口率；(2)由于辅助电极15是利用光罩(mask)沉积于第二电极14上，为了制造高解析度的有机发光装置1，辅助电极15的尺寸势必得相对缩小，然而目前的技术若要将光罩的孔洞缩成相对应的尺寸有其困难度，同时花费亦高，且若辅助电极15的尺寸太细，亦无法有效增加导电性。When the organic light-emitting device 1 emits light from the top surface, the thickness of the second electrode 14 must be less than

To increase the efficiency of light transmission. However, when the thickness of the second electrode 14 is less than

, a discontinuous electrode surface is likely to occur, resulting in an increase in the resistance value of the second electrode 14 and a decrease in electron injection efficiency. To solve this problem, the current technology uses the auxiliary electrode 15 to improve the conduction efficiency of the second electrode 14 and reduce the operating voltage of the organic light emitting device 1 . However, the current solution has the following two disadvantages: (1) Since the organic light-emitting device 1 emits light from the top surface, the auxiliary electrode 15 disposed on the top surface will reduce the aperture ratio of the pixel; (2) since the auxiliary electrode 15 uses A mask (mask) is deposited on the second electrode 14. In order to manufacture a high-resolution organic light-emitting device 1, the size of the auxiliary electrode 15 must be relatively reduced. Dimensioning is difficult and costly, and if the size of the auxiliary electrode 15 is too thin, the conductivity cannot be effectively increased.

In order to solve the bottleneck in the current technology, the present invention is contemplating an organic light-emitting device and an electrode substrate that can solve this problem. After several researches and experiments, the invention is finally completed.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide an organic light-emitting device and an electrode substrate, wherein the auxiliary electrode is disposed under the organic functional layer without affecting the aperture ratio of the pixel.

To achieve the above object, an organic light-emitting device according to the present invention sequentially includes a substrate, an auxiliary electrode, an insulating layer, a first electrode, at least one organic functional layer, and a second electrode, wherein at least a part of The second electrode is directly connected with the auxiliary electrode.

To achieve the above object, an electrode substrate according to the present invention sequentially includes a substrate, an auxiliary electrode, an insulating layer and an electrode, wherein at least a part of the electrodes are directly bonded to the auxiliary electrode.

As mentioned above, in the organic light-emitting device and the electrode substrate of the present invention, the auxiliary electrode is disposed under the organic functional layer. Compared with the conventional technology, since the auxiliary electrode of the present invention is arranged under the organic functional layer, when the light emitting direction is the top surface, the arrangement of the auxiliary electrode will not affect the aperture ratio of the pixel. In addition, the installation area of the auxiliary electrode does not need to match the size of the pixel, so when the size of the pixel is reduced, the design of the mask used to deposit the auxiliary electrode does not need to be changed, and the auxiliary electrode can also have a larger installation area, which can be greatly increased. Conductivity and current carrying capacity.

Description of drawings

FIG. 1 is a schematic diagram showing a conventional OLED.

FIG. 2 is a schematic diagram showing an organic light emitting device according to a first embodiment of the present invention.

FIG. 3 is another schematic diagram showing the organic light emitting device according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram showing an electrode substrate according to a second embodiment of the present invention.

FIG. 5 is another schematic diagram showing an electrode substrate according to a second embodiment of the present invention.

1: Organic light-emitting device 11: Substrate

12: First electrode 13: Organic functional layer

14: Second electrode 15: Auxiliary electrode

2: Organic light-emitting device 21: Substrate

22: Auxiliary electrode 23: Insulation layer

24: First electrode 25: Organic functional layer

26: Second electrode 27: Protective layer

3: Electrode substrate 31: Substrate

32: Auxiliary electrode 33: Insulation layer

34: Electrode 35: Protective layer

Detailed ways

An organic light emitting device and an electrode substrate according to preferred embodiments of the present invention will be described below with reference to related drawings.

For the convenience of description, the organic light-emitting device that emits light from the top surface is used as an example below, but not limited thereto.

first embodiment

Please refer to FIG. 2, which is an organic light-emitting device 2 according to the first embodiment of the present invention, which sequentially includes a substrate 21, an auxiliary electrode 22, an insulating layer 23, a first electrode 24, an organic functional layer 25 and A second electrode 26 , wherein at least a part of the second electrode 26 is directly connected to the auxiliary electrode 22 .

In this embodiment, the substrate 21 may be a flexible substrate or a rigid substrate. Meanwhile, the substrate 21 can also be a plastic substrate or a glass substrate. Among them, the flexible substrate and the plastic substrate can be polycarbonate (polycarbonate, PC) substrate, polyester (polyester, PET) substrate, cyclic olefin copolymer (cyclic olefin copolymer, COC) substrate or metal chromate substrate-cycloolefin Copolymer (metallocene-based cyclic olefincopolymer, mCOC) substrate. In addition, the substrate 21 may also be a silicon substrate.

In addition, as shown in FIG. 2 , the auxiliary electrode 22 is formed on the substrate 21 . Wherein, the material of the auxiliary electrode 22 can be a conductive substance or a conductive metal oxide, wherein the conductive metal oxide is selected from indium tin oxide (ITO), aluminum zinc oxide (AZO), indium zinc oxide (IZO) and At least one of cadmium tin oxide (CdSnO), wherein the conductive substance is selected from at least one of aluminum, calcium, magnesium, indium, tin, manganese, chromium, copper, silver, gold and alloys thereof, and alloys containing magnesium include But not limited to magnesium-silver alloy, magnesium-indium alloy, magnesium-tin alloy, magnesium-antimony alloy and magnesium-tellurium alloy. Here, the auxiliary electrode 22 is used to increase the conductivity and current carrying capacity of the second electrode 26 .

Furthermore, please refer to FIG. 2 , the insulating layer 23 of this embodiment is arranged on the auxiliary electrode 22 to prevent the auxiliary electrode 22 from contacting with the first electrode 24 to cause a short circuit. The material of the insulating layer 23 is non-conductive. Substances, such as but not limited to silicon oxide, silicon nitride, silicon oxynitride, diamond-like carbon, photoresist, zinc sulfide (ZnS), selenium sulfide (ZnSe) or polyimide .

The first electrode 24 is generally used as an anode and its material can be a conductive substance or a conductive metal oxide, wherein the conductive metal oxide is selected from indium tin oxide, aluminum zinc oxide, indium zinc oxide and cadmium tin oxide. One of them, wherein the conductive substance is selected from at least one of aluminum, calcium, magnesium, indium, tin, manganese, chromium, copper, silver, gold and alloys thereof, and magnesium-containing alloys include but are not limited to magnesium-silver alloys, Magnesium-indium alloy, magnesium-tin alloy, magnesium-antimony alloy and magnesium-tellurium alloy.

In addition, the organic functional layer 25 generally includes a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer (not shown in the figure). Wherein, the organic functional layer 25 is formed on the first electrode 24 by evaporation, spin coating, inkjet printing, transfer or printing. . In addition, the light emitted by the organic functional layer 25 can be blue light, green light, red light, white light, other monochromatic light or a color light formed by combining monochromatic light.

The second electrode 26 is light-transmissive, and it is usually used as a cathode and its material can be a conductive substance or a conductive metal oxide, wherein the conductive metal oxide is selected from indium tin oxide, aluminum zinc oxide, indium zinc oxide and At least one of cadmium tin oxides, wherein the conductive substance is selected from aluminum, calcium, magnesium, indium, tin, manganese, chromium, copper, silver, gold and their alloys, magnesium-containing alloys include but are not limited to magnesium-silver alloys , magnesium indium alloy, magnesium tin alloy, magnesium antimony alloy and magnesium tellurium alloy. The first electrode 24 can also be used as a cathode, while the second electrode 26 can be used as an anode

In addition, as shown in FIG. 3 , the organic light emitting device 2 of this embodiment further includes a protective layer 27 disposed between the substrate 21 and the auxiliary electrode 22 . Here, the protection layer 27 can not only have the effect of waterproofing the intrusion of gas, but also have the function of insulation. The material of the protection layer 27 is a non-conductive material, such as but not limited to silicon oxide, silicon nitride, silicon oxynitride, etc. Diamond film, photoresist, zinc sulfide, selenium sulfide or polyimide.

In this embodiment, because the auxiliary electrode 22 is arranged below the organic functional layer 25, when the light emitted by the organic functional layer 25 is emitted from the direction of the second electrode 26, the location and area of the auxiliary electrode 22 are different. It will affect the path of light, so the size and shape of the auxiliary electrode 22 can be designed according to actual needs.

second embodiment

In addition, as shown in FIG. 4 and FIG. 5 , an electrode substrate 3 according to the second embodiment of the present invention includes a substrate 31 , an auxiliary electrode 32 , an insulating layer 33 and an electrode 34 in sequence.

As shown in FIG. 5 , the electrode substrate 3 of this embodiment further includes a protection layer 35 disposed between the substrate 31 and the auxiliary electrode 32 .

The features and functions of the substrate 31 , the auxiliary electrode 32 , the insulating layer 33 , the electrode 34 and the protective layer 35 in this embodiment are the same as those of the first embodiment, and will not be repeated here.

As mentioned above, in the organic light-emitting device and the electrode substrate of the present invention, the auxiliary electrode is disposed under the organic functional layer. Compared with the conventional technology, since the auxiliary electrode of the present invention is arranged under the organic functional layer, when the light emitting direction is the top surface, the arrangement of the auxiliary electrode will not affect the aperture ratio of the pixel. In addition, the installation area of the auxiliary electrode does not need to match the size of the pixel. Therefore, when the size of the pixel is reduced, the design of the mask for depositing the auxiliary electrode does not need to be changed, and the auxiliary electrode can also have a larger installation area, which can be greatly increased. Conductivity and current carrying capacity.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the claims of the present invention.

Claims (5)

1, a kind of organic light emitting apparatus is characterized in that it comprises in regular turn:

One substrate;

One auxiliary electrode;

One insulating barrier;

One first electrode;

At least one organic functional layer; And

One second electrode; Wherein, second electrode of at least a portion is directly to engage with auxiliary electrode.

2, organic light emitting apparatus according to claim 1 is characterized in that it more comprises a protective layer, is arranged between substrate and the auxiliary electrode.

3, organic light emitting apparatus according to claim 1 is characterized in that the metal oxide of the material of first electrode wherein and/or second electrode for conduction.

4, organic light emitting apparatus according to claim 1 is characterized in that the wherein metal oxide of material for conducting electricity of auxiliary electrode.

5, organic light emitting apparatus according to claim 1, it is characterized in that wherein insulating barrier be selected from silica, silicon nitride, silicon oxynitride, class diamond film, zinc sulphide, selenium sulfide or pi at least one of them.

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