CN107342309B - High-reliability passive organic electroluminescent device and preparation method thereof - Google Patents
High-reliability passive organic electroluminescent device and preparation method thereof Download PDFInfo
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- CN107342309B CN107342309B CN201710544156.XA CN201710544156A CN107342309B CN 107342309 B CN107342309 B CN 107342309B CN 201710544156 A CN201710544156 A CN 201710544156A CN 107342309 B CN107342309 B CN 107342309B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/17—Passive-matrix OLED displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/17—Passive-matrix OLED displays
- H10K59/179—Interconnections, e.g. wiring lines or terminals
- H10K59/1795—Interconnections, e.g. wiring lines or terminals comprising structures specially adapted for lowering the resistance
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- H—ELECTRICITY
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- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
Abstract
The invention belongs to the technical field of organic electroluminescent devices, and particularly relates to a high-reliability passive organic electroluminescent device. The high-reliability passive organic electroluminescent device comprises a substrate, and an anode layer, an organic light-emitting layer and a cathode layer which are sequentially formed on the substrate, wherein the organic light-emitting layer in the crossing region of the anode layer and the cathode layer forms a screen body light-emitting pixel, and the light-emitting pixel structure is divided into a plurality of sub-pixel regions smaller than a visible range according to the specific application field of the light-emitting pixel structure. According to the device, the anode pixels are partitioned, the series resistors are designed, and the leakage current passing through a single potential defect point is controlled, so that the defects are reduced; through the preset partition size, the control is within the visual scale of human vision, so that the technical mode can not influence the appearance and the visual effect of the screen body.
Description
Technical Field
The invention belongs to the technical field of organic electroluminescent devices, and particularly relates to a high-reliability passive organic electroluminescent device.
Background
OLED (Organic Light Emitting Display) refers to a phenomenon in which an Organic semiconductor material and a Light Emitting material emit Light by carrier injection and recombination under electric field driving. A typical organic electroluminescent device structure thereof includes an organic electroluminescent medium disposed between a first electrode and a second electrode serving as an anode for hole injection and a cathode for electron injection. The principle is that an ITO transparent electrode and a metal electrode are respectively used as an anode and a cathode of the device, under the drive of a certain voltage, electrons and holes are respectively injected into an electron and hole transport layer from the cathode and the anode, the electrons and the holes respectively migrate to a luminescent layer through the electron and hole transport layer and meet in the luminescent layer to form excitons and excite luminescent molecules, and the luminescent molecules emit visible light through radiation relaxation. The radiated light can be observed from the ITO side, and the metal electrode film also functions as a reflective layer. A display manufactured according to such a light emitting principle is called an organic light emitting display, also called an OLED display.
A passive matrix organic electroluminescent display (PMOLED) is one of OLED devices, and a typical PM-OLED includes a glass substrate, an ITO anode, an organic light emitting layer and a cathode, wherein the thin and transparent ITO anode and the metal cathode sandwich the organic light emitting layer, and when a hole injected into the anode and an electron from the cathode combine in the organic light emitting layer, the organic material is excited to emit light. A typical PMOLED device is driven by a row (or column) scanning mode (the PMOLED panel circuit is schematically shown in fig. 1), for example: a PMOLED dot-matrix screen has M columns (anodes), N rows (cathodes), and the resolution of the screen is M × N. The area of the interlaced cathode and anode is the light emitting area (which can be regarded as a light emitting diode) of the OLED, and only when current flows, the light will be emitted, and the instantaneous brightness thereof is proportional to the line scan, for example, the average brightness of the display screen is 100cd/m2With 96 scan lines, the pixel display brightness must be greater than 9600cd/m2Considering the loss of aperture ratio and polarizing film, the pixel brightness is required to be (2-4) × 104cd/m2In the meantime.
As shown in FIG. 2, the conventional PMOLED substrate adopts a Metal/ITO structure, wherein the Metal generally adopts Ag, MoAlMo, Cr, etc. The pixel structure is generally shown, for example, with an ITO anode in the vertical direction and an Al metal cathode in the horizontal direction. In general, in the design, during driving, a cathode is connected with a negative pole, for example, the cathode in the first row is selected to be connected. And the column electrode corresponding to the first row outputs corresponding current according to the graphic information. The current flows into 12 anodes and flows out of one cathode. The resistivity of the cathode has a great influence on the panel, and an auxiliary electrode lead is usually provided to reduce the sheet resistance.
The PMOLED device is characterized by very high single-point brightness of the display pixel, and relatively high driving current density. Under the drive of large current density, some potential defects are easy to gradually deteriorate through the drive of large current, and further cause the failure of the screen body.
As shown in the enlarged view of the defect given in fig. 3 (100um × 100um), the defect that the conventional PMOLED device is very likely to occur is a tiny dark or bright spot having a size of about 1 um. Generally, the defect is caused by the existence of leakage current on the anode and cathode parts due to the particles on the anode surface (as shown in fig. 4). Under high current density or high temperature working environment, the leakage current caused by the defect will be gradually deteriorated, and further the whole pixel, even one row (or column) of the screen body will be failed.
In some organic electroluminescent device (OLED) designs, for example, chinese patent CN101960639A discloses a solution to the above problem by using a short reduction layer, which proposes to use a mixed oxide as a defect prevention layer, which can solve the above defect problem of the PMOLED device to some extent. However, the short-circuit reduction layer designed in the above scheme mainly aims at increasing resistance, so that a proper resistivity needs to be adjusted, and the added short-circuit reduction layer needs to meet a proper work function because of being matched with a base layer, which has great difficulty in material selection; meanwhile, the design is designed aiming at the AMOLED and illumination, the problem that the pixel passing current density of the PMOLED device under specific working current is high is solved, and the structural design of the scheme considers the effect for response to a certain extent.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide a highly reliable passive organic electroluminescent device to solve the problem of the screen body defect of the passive organic electroluminescent device in the prior art.
In order to solve the technical problem, the high-reliability passive organic electroluminescent device comprises a substrate, and an anode layer, an organic light emitting layer and a cathode layer which are sequentially formed on the substrate, wherein the organic light emitting layer in the crossing region of the anode layer and the cathode layer forms a screen body light emitting pixel, and the light emitting pixel structure is divided into a plurality of sub-pixel regions smaller than a visible range according to the specific application field of the light emitting pixel structure.
Preferably, the light-emitting pixel is divided into a plurality of sub-pixel regions by dividing the anode layer into a plurality of anode sub-regions, and each of the sub-pixel regions is connected to an auxiliary anode layer disposed on the surface of the anode layer.
Alternatively, the light-emitting pixel is divided into a plurality of sub-pixel regions by dividing the cathode layer into a plurality of cathode sub-regions.
The number of the sub-pixel regions is at least 2.
Each sub-pixel region independently comprises a hexagonal structure, a right-angled triangular structure, a square structure or an irregular shape.
The sub-pixel regions are equally divided and arranged in a regular manner.
The auxiliary anode layer is a low-resistance metal layer (such as Mo/Al/Mo, Cu, Ag and the like) and is used for reducing the resistance of the anode.
The auxiliary anode layer is arranged along the circumferential direction of the anode layer pixel.
The auxiliary anode layer is arranged on at least one side of the circumferential direction of the anode layer pixel.
Preferably, the device further comprises a hole injection layer, a hole transport layer, an electron transport layer and/or an electron injection layer.
The invention also discloses a method for preparing the high-reliability passive organic electroluminescent device, which comprises the following steps:
(1) preparing the selected substrate according to a conventional method in the prior art;
(2) preparing the anode layer with a corresponding structure according to the structure and the arrangement mode of the selected sub-pixel region and a conventional method;
(3) preparing the auxiliary anode layer with selected material and structure according to a conventional method, and connecting the auxiliary anode layer with each sub-pixel region;
(4) preparing the organic light-emitting layer and the cathode layer according to a conventional method, and packaging to finish the preparation of the screen body;
alternatively, the first and second electrodes may be,
(1) preparing the selected substrate according to a conventional method in the prior art;
(2) preparing the anode layer and the organic light-emitting layer according to a conventional method;
(3) preparing the cathode layer with a corresponding structure according to the structure and the arrangement mode of the selected sub-pixel regions and a conventional method;
(4) and (5) packaging to finish the preparation of the screen body. The method further comprises the step of preparing the hole injection layer, the hole transport layer, the electron transport layer and/or the electron injection layer according to a conventional method.
According to the high-reliability passive organic electroluminescent device, the anode pixels are partitioned, the series resistors are designed, and the leakage current passing through a single potential defect point is controlled, so that the defects are reduced; an auxiliary metal electrode is arranged on one electrode (such as anode ITO), so that the lead resistance is reduced, and the sub-area photon-emitting pixels are connected in parallel; through the preset partition size, the control is within the visual scale of human vision, so that the technical mode can not influence the appearance and the visual effect of the screen body.
Drawings
In order that the present disclosure may be more readily and clearly understood, the following detailed description of the present disclosure is provided in connection with specific embodiments thereof and the accompanying drawings, in which,
FIG. 1 is a diagram of a PMOLED panel circuit;
FIG. 2 is a schematic diagram of the cause of defects in a PMOLED panel;
FIG. 3 is an enlarged view of a defect in a PMOLED panel;
FIG. 4 is an anode and cathode structure of a conventional PMOLED;
FIG. 5 is a schematic view of a pixel structure in embodiment 1;
FIG. 6 is a schematic view of a pixel structure in embodiment 2;
FIG. 7 is a schematic view of a pixel structure according to embodiment 3;
fig. 8 is a schematic view of the division of the metal cathode in example 4.
Detailed Description
Example 1
In this embodiment, the high-reliability passive organic electroluminescent display screen is 1.1 inch in sizeFor example, a 132-column by 64-line display screen comprises a substrate, and an anode layer, an anode auxiliary layer, a hole injection layer (m-MTDATA doped with 2% F4tcnq), a hole transport layer (NPB), and an organic light emitting layer (Alq) sequentially formed on the substrate3: C545T), electron transport layer (Alq)3) Electron injection Layer (LiF), cathode (Al), etc., and packaging.
The anode auxiliary layers are positioned on two sides of the ITO anode pixel and play a role in reducing the surface resistance of the anode line, and the positions of the anode auxiliary layers are shown as black line parts in figure 5.
The light-emitting pixel structure of the screen body is divided into a plurality of pixel regions smaller than the visible range, and the area of each pixel region is 200 multiplied by 200 mu m2. As shown in fig. 5, each of the pixel structures is equally divided into sub-pixel regions with a six-divided triangle structure, and the sub-pixel regions are regularly arranged, and the sub-pixel interval is 5 um.
The highly reliable passive organic electroluminescent device described in this example was prepared according to a method well known to those skilled in the art, and includes the following steps:
selecting an ITO/MoAlMo substrate, and preparing a MoAlMo graph by cleaning, gluing, exposing, developing and etching; this layer includes both the lead portions (as labeled in fig. 2) at the periphery of the light emitting region and the anode column portions (e.g., on both sides of the column of pixels in fig. 3);
preparing an ITO (indium tin oxide) pattern through cleaning, gluing, exposing, developing and etching, wherein the ITO pattern is a column lead part of a luminous zone and also comprises a lower part of MoAlMo;
the insulating layer is prepared by coating, exposing and developing methods, and mainly plays a role in limiting a light-emitting area and preventing short circuit;
preparing an isolation column layer (Rib) on the insulating layer in the row direction through coating, exposure and development;
and preparing a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer, a cathode (Al) and the like on the substrate in a vacuum evaporation mode, and packaging to finish the preparation of the PMOLED screen body.
Example 2
In this embodiment, the device structure is the same as that in embodiment 1, and the high-reliability passive organic electroluminescent display panel, taking a 1.1-inch display panel with 132 columns by 64 rows as an example, includes a substrate, and an anode layer, an anode auxiliary layer, a hole injection layer (m-MTDATA doped with 2% F4tcnq), a hole transport layer (NPB), and an organic light emitting layer (Alq) sequentially formed on the substrate3: C545T), electron transport layer (Alq)3) Electron injection Layer (LiF), cathode (Al), etc., and packaging.
The anode auxiliary layers are positioned on two sides of the ITO anode pixel and play a role in reducing the surface resistance of the anode line, and the positions of the anode auxiliary layers are shown as black line parts in figure 6.
The light-emitting pixel structure of the screen body is divided into a plurality of pixel regions smaller than the visible range, and the area of each pixel region is 200 multiplied by 200 mu m2. As shown in fig. 6, each of the pixel structures is equally divided into sub-pixel regions with square structures, and the sub-pixel regions are regularly arranged, and the sub-pixel interval is 5 um.
The high-reliability passive organic electroluminescent device described in this example was prepared as in example 1.
Example 3
In this embodiment, the device structure is the same as that in embodiment 1, and the high-reliability passive organic electroluminescent display panel, taking a 1.1-inch display panel with 132 columns by 64 rows as an example, includes a substrate, and an anode layer, an anode auxiliary layer, a hole injection layer (m-MTDATA doped with 2% F4tcnq), a hole transport layer (NPB), and an organic light emitting layer (Alq) sequentially formed on the substrate3: C545T), electron transport layer (Alq)3) Electron injection Layer (LiF), cathode (Al), etc., and packaging.
The anode auxiliary layer is located around the ITO anode pixels and plays a role in reducing the surface resistance of the anode lines, and the positions of the anode auxiliary layer are shown as black line parts in figure 7.
The light-emitting pixel structure of the screen body is divided into a plurality of pixel regions smaller than the visible range, and the area of each pixel region is 200 multiplied by 200 mu m2. As shown in fig. 7, each of the pixel structures is equally divided into sub-pixel regions of square structure, andare regularly arranged, and the sub-pixel interval is 5 um.
The high-reliability passive organic electroluminescent device described in this example was prepared as in example 1.
Example 4
The device structure and material of this embodiment are the same as those of embodiment 1, except that the partition of the screen pixel is formed by partitioning the metal cathode layer, and the partition structure unit and shape of the metal cathode are shown in fig. 8. The cathode sub-region is formed by two segmentation methods, one can be separated by an isolation column, and the other can be evaporated by a mask, which are conventional methods in the prior art.
Comparative example 1
This comparative example is the same as example 1, and the high-reliability passive organic electroluminescent display panel, taking a 1.1-inch 132-column by 64-line display panel as an example, has a panel body structure comprising a substrate, and an anode layer, an anode auxiliary layer, a hole injection layer (m-MTDATA doped with 2% F4tcnq), a hole transport layer (NPB), and an organic light emitting layer (Alq) sequentially formed on the substrate3: C545T), electron transport layer (Alq)3) Electron injection Layer (LiF), cathode (Al), etc., and packaging.
Examples of the experiments
The device performance of each of the examples and comparative examples was tested according to the prior art method and is reported in table 1 below.
TABLE 1 device Performance parameters
As can be seen from the data in the table above, by adopting the design of sub-pixel area division, the screen body defects are obviously reduced, mainly because the current passing through a single partition is limited after the sub-pixel area division is blocked, the problem of complete short circuit of a potential defect point caused by large current is reduced; the more partitions, the fewer the number of defects. Comparing examples 2 and 3, it can be seen that the auxiliary anode has large area, relatively reducing the resistance in the anode column direction, and improving the screen brightness.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A high-reliability passive organic electroluminescent device comprises a substrate, and an anode layer, an organic light emitting layer and a cathode layer which are sequentially formed on the substrate, and is characterized in that the organic light emitting layer in the crossing region of the anode layer and the cathode layer forms a screen body light emitting pixel;
the light-emitting pixel is divided into a plurality of anode sub-regions by dividing the anode layer into a plurality of sub-pixel regions smaller than a visible range, each sub-pixel region is regularly divided and regularly arranged, each sub-pixel region is respectively connected with an auxiliary anode layer arranged on the surface of the anode layer, and the auxiliary anode layer is arranged along the circumferential direction of the pixels of the anode layer.
2. The highly reliable passive organic electroluminescent device as claimed in claim 1, wherein each of the sub-pixel regions independently comprises a hexagonal structure, a right-angled triangular structure, a square structure, or an irregular shape.
3. The high reliability passive organic electroluminescent device as claimed in claim 2, wherein the auxiliary anode layer is formed of a low resistance metal for reducing anode resistance.
4. The high reliability passive organic electroluminescent device of claim 3, wherein the auxiliary anode layer is disposed at least one side of a pixel circumference of the anode layer.
5. The high reliability passive organic electroluminescent device according to any one of claims 1 to 4, wherein the device further comprises a hole injection layer, a hole transport layer, an electron transport layer and/or an electron injection layer.
6. A method for preparing a highly reliable passive organic electroluminescent device as claimed in any one of claims 1 to 5, characterized by comprising the steps of:
(1) preparing the selected substrate;
(2) preparing the anode layer with a corresponding structure according to the structure and the arrangement mode of the selected sub-pixel regions;
(3) preparing the auxiliary anode layer with selected material and structure, and connecting the auxiliary anode layer with each sub-pixel region;
(4) and preparing the organic light-emitting layer and the cathode layer, and packaging to finish the preparation of the screen body.
7. A high-reliability passive organic electroluminescent device comprises a substrate, and an anode layer, an organic light emitting layer and a cathode layer which are sequentially formed on the substrate, and is characterized in that the organic light emitting layer in the crossing region of the anode layer and the cathode layer forms a screen body light emitting pixel;
the light-emitting pixel is divided into a plurality of sub-pixel areas smaller than a visual range by dividing the cathode layer into a plurality of cathode sub-areas, and each sub-pixel area is regularly divided and regularly arranged.
8. The highly reliable passive organic electroluminescent device as claimed in claim 7, wherein each of the sub-pixel regions independently comprises a hexagonal structure, a right-angled triangular structure, a square structure, or an irregular shape.
9. The highly reliable passive organic electroluminescent device according to claim 7 or 8, wherein the device further comprises a hole injection layer, a hole transport layer, an electron transport layer and/or an electron injection layer.
10. A method of manufacturing a highly reliable passive organic electroluminescent device as claimed in any one of claims 7 to 9, characterized by comprising the steps of:
(1) preparing the selected substrate;
(2) preparing the anode layer and the organic light-emitting layer;
(3) preparing the cathode layer with a corresponding structure according to the selected structure and arrangement mode of the sub-pixel regions;
(4) and (5) packaging to finish the preparation of the screen body.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329455A (en) * | 2000-06-19 | 2002-01-02 | Lg电子株式会社 | Panchromatic organic electroluminescent display screen and its making method and drinking circuit |
| CN103201676A (en) * | 2010-10-05 | 2013-07-10 | 阿克里奥瑞典信息和通信技术研究（Ict)公司 | Display device |
| CN103762224A (en) * | 2014-01-29 | 2014-04-30 | 京东方科技集团股份有限公司 | Organic electroluminescence display panel |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329455A (en) * | 2000-06-19 | 2002-01-02 | Lg电子株式会社 | Panchromatic organic electroluminescent display screen and its making method and drinking circuit |
| CN103201676A (en) * | 2010-10-05 | 2013-07-10 | 阿克里奥瑞典信息和通信技术研究（Ict)公司 | Display device |
| CN103762224A (en) * | 2014-01-29 | 2014-04-30 | 京东方科技集团股份有限公司 | Organic electroluminescence display panel |
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