CN112331796A - Grid electrode, preparation method thereof and light-emitting device - Google Patents

Grid electrode, preparation method thereof and light-emitting device Download PDF

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Publication number
CN112331796A
CN112331796A CN201911323766.2A CN201911323766A CN112331796A CN 112331796 A CN112331796 A CN 112331796A CN 201911323766 A CN201911323766 A CN 201911323766A CN 112331796 A CN112331796 A CN 112331796A
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conductive
ink
grid electrode
light
area
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林杰
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Guangdong Juhua Printing Display Technology Co Ltd
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Guangdong Juhua Printing Display Technology Co Ltd
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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
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • 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
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

The application relates to a grid electrode, a preparation method thereof and a light-emitting device. The grid electrode comprises a plurality of conductive units, and the adjacent conductive units are mutually connected; the conductive unit is provided with a light-transmitting area and a conductive area surrounding the light-transmitting area, and the conductive area is formed by stacking conductive materials. The width of the conductive area of the conductive unit of the grid electrode is small, and then the display effect and the light transmittance of the light-emitting device with the grid electrode are improved.

Description

Grid electrode, preparation method thereof and light-emitting device
Technical Field
The application relates to the technical field of display, in particular to a grid electrode, a preparation method of the grid electrode and a light-emitting device.
Background
Organic Light Emitting Devices (OLEDs) have the advantages of wide color gamut, high contrast, fast response, large viewing angle, low power consumption, etc., and thus have become a research hotspot in the next generation of display technologies. At present, transparent electrodes with good light permeability and electrical conductivity are generally selected as electrodes of the organic light emitting diode device. Common transparent electrodes include indium tin oxide electrodes, metallic silver film electrodes, and metallic mesh electrodes. However, indium tin oxide electrodes and silver film electrodes have restricted the development of transparent electrodes due to their disadvantages of high resistance, poor flexibility, and strong reflectivity. Therefore, a mesh electrode capable of achieving both good conductivity, high transmittance, and low reflection characteristics is a development direction of a transparent metal electrode in the future.
However, the light emitting device including the conventional mesh electrode has disadvantages such as poor visual effect, low light transmittance, and the like.
Disclosure of Invention
In view of the above, it is necessary to provide a novel grid electrode capable of improving the transmittance of a light emitting device, in order to solve the problem of low transmittance of a light emitting device including a conventional grid electrode.
A grid electrode, comprising:
the adjacent conductive units are mutually connected;
the conductive unit is provided with a light-transmitting area and a conductive area surrounding the light-transmitting area, and the conductive area is formed by stacking conductive materials.
In one embodiment, the conductive unit is circular in shape, the conductive unit is provided with a circular light-transmitting area and a conductive area surrounding the circular light-transmitting area, and the width of the conductive area accounts for 7% -20% of the length of the radius of the conductive unit.
In one embodiment, a plurality of the conductive units are distributed in an array.
In one embodiment, the width of the conductive region is 2 μm to 50 μm, and/or the average thickness of the conductive region is 300nm to 600 nm.
In one embodiment, the conductive material is selected from at least one of metal particles and carbon nanotubes.
In one embodiment, the carbon nanotubes have a length of 10nm to 100nm and a cross-sectional diameter of 0.5nm to 20 nm.
In one embodiment, the metal particles are selected from at least one of nano silver, nano copper and nano aluminum.
The inventor of the application finds that the problems of poor visual effect and low light transmittance of the traditional grid electrode are mainly caused by the fact that the conductive region of the grid electrode is too wide, the fineness is low, and the display effect of a light-emitting device is poor; in addition, the excessively wide conductive region may shield a portion of the effective light emitting area of the display device, resulting in a reduced effective light emitting area and a low light transmittance of the display device.
The utility model provides a simple structure of grid electrode, including a plurality of electrically conductive units, it is adjacent interconnect between the electrically conductive unit, wherein, electrically conductive unit have by conductive material pile up light-transmitting area and around the conducting region in light-transmitting area, its formation process is that conductive material migrates to the edge of electrically conductive unit, piles up and forms the conducting region, and forms light-transmitting area in the inside of electrically conductive unit. The width of the conductive area of the conductive unit is small, and therefore the display effect and the light transmittance of the light-emitting device with the grid electrode are improved.
The application also provides a preparation method of the grid electrode, which comprises the following steps:
printing ink containing conductive materials on a substrate at intervals, drying to obtain a plurality of first conductive units, and in the drying process, the conductive materials in the ink are stacked at the edge of the ink to form a first conductive area of the first conductive unit and a first light-transmitting area surrounded by the first conductive area;
printing ink containing conductive materials, at least partially overlapped with the adjacent first conductive units, between the plurality of first conductive units, drying to obtain a plurality of second conductive units, wherein the second conductive units are mutually connected with the first conductive units, and in the drying process, the conductive materials in the ink are stacked on the edge of the ink to form a second conductive area of the second conductive unit and a second light-transmitting area surrounded by the second conductive area.
In one embodiment, in the step of printing the conductive material-containing ink at least partially overlapping the adjacent first conductive elements among the plurality of first conductive elements, the conductive material-containing ink at least partially overlapping the adjacent first conductive elements is printed in gap areas among the plurality of first conductive elements.
In one embodiment, the substrate is printed with ink containing conductive material at intervals, the printing is by ink-jet printing, and/or
In the step of printing the ink containing the conductive material at least partially overlapped with the adjacent first conductive units among the plurality of first conductive units, the printing mode is an ink-jet printing mode.
The present application also provides a light emitting device, comprising:
a substrate;
the first electrode is arranged on the substrate and is a grid electrode or a grid electrode prepared by the grid electrode preparation method;
a light emitting layer provided on the first electrode; and
and a second electrode disposed on the light emitting layer.
In one embodiment, the first electrode includes a plurality of first sub-electrodes spaced apart from each other.
In one embodiment, the second electrode comprises a plurality of second sub-electrodes spaced apart from each other.
Drawings
Fig. 1 is a flowchart of a method for manufacturing a grid electrode in an embodiment.
FIG. 2 is a schematic cross-sectional view illustrating a process of forming a first conductive element according to an embodiment.
FIG. 3 is a schematic cross-sectional view illustrating a second conductive element formed during an embodiment.
FIG. 4 is a schematic top view of the structures of a grid electrode during the formation of the grid electrode in one embodiment.
Fig. 5 is a partially enlarged view of the first conductive element in one embodiment.
Fig. 6 is a partially enlarged view of a second conductive element according to an embodiment.
Fig. 7 is a schematic structural diagram of a metal mesh electrode in an embodiment.
FIG. 8 is an enlarged view of a portion of a conductive element in one embodiment.
Fig. 9 is a schematic structural diagram of a metal grid electrode in another embodiment.
Fig. 10 is a schematic structural view of a light-emitting device in one embodiment.
Fig. 11 is a schematic structural view of a light-emitting device in another embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 2 to 4 in combination with fig. 1, an embodiment of the present application provides a method for manufacturing a grid electrode, which includes the following steps:
and S1, printing ink containing conductive materials on the substrate at intervals, drying to obtain a plurality of first conductive units, wherein in the drying process, the conductive materials in the ink are stacked at the edge of the ink to form a first conductive area of the first conductive units, and the first conductive area surrounds to form a first light-transmitting area.
For better illustration of the preparation process of the grid electrode of the present application, the ink containing the conductive material printed at intervals on the substrate is referred to as a first ink.
Specifically, a substrate 101 is provided, a plurality of first inks 103 containing conductive materials are printed on the substrate 101 at intervals, the first inks 103 are dried to obtain first ink marks 105, and a first conductive unit 110 corresponding to the first ink marks 105 is obtained through sintering treatment.
In one embodiment, the first ink 103 is printed by inkjet printing, and during the inkjet printing, a plurality of first inks 103 are printed at intervals to form a regular ink matrix, so that the finally formed first conductive units 110 are arranged in an array.
In one embodiment, the first ink 103 includes a first solvent and a conductive material that is mobile with the first solvent.
In one embodiment, the conductive material is selected from at least one of metal particles and carbon nanotubes.
When the conductive material is selected from carbon nanotubes, the length of the carbon nanotubes in the first ink 103 is 10nm to 100nm, and the cross-sectional diameter is 0.5nm to 20 nm.
In the present embodiment, when the conductive material is selected from carbon nanotubes, the first solvent is selected from at least one of chloroform, o-dichlorobenzene, N-Dimethylformamide (DMF), and N-methylpyrrolidone (NMP).
In this embodiment, the mass percentage of the carbon nanotubes in the first ink 103 is 0.1% to 1.5%. Within this range, the first solvent is more favorable to carry more carbon nanotubes to the edge of the first ink 103.
When the conductive material is selected from metal particles, the particle size of the metal particles in the first ink 103 ranges between 10nm and 100 nm. Within this size range, migration of the metal particles with the solvent is more facilitated.
In the present embodiment, when the conductive material is selected from metal particles, the first solvent is selected from at least one of ethanol, cyclohexane, toluene, xylene, and anisole. Furthermore, the first solvent is toluene, which is more favorable for carrying metal particles to migrate.
In this embodiment, the material of the metal nanoparticles in the first ink 103 is selected from silver, copper, aluminum, and the like, which have high conductivity. Further, the material of the metal nanoparticles in the first ink 103 is selected from silver, and the silver as the migratable metal nanoparticles has better stability and light transmittance in the environment of normal temperature and pressure, which is beneficial to forming a metal grid electrode with excellent performance.
In this embodiment, the metal particles in the first ink 103 account for 0.3% to 5% by mass of the first ink 103. Within this range, the first solvent is more favorable to carry more migratable metal particles to the edge of the first ink 103.
The following describes a process for manufacturing the first conductive element according to one embodiment of the present application with reference to the principle of the present application:
during the drying process of the substrate 101 printed with the first ink 103, the first solvent contained in the first ink 103 is volatilized continuously, and the surface tension of the edge area of the first ink 103 is smaller than that of the middle area of the first ink 103, so that the first solvent volatilization speed of the edge area of the first ink 103 is faster than that of the middle area of the first ink 103. After the first solvent in the edge region volatilizes, the first solvent in the middle region may drive the migratory metal particles in the middle region to move to the edge region of the first ink 103, and along with the continuous volatilization of the first solvent in the edge region, the first solvent in the middle region carries the migratory metal particles to continuously supply to the edge region, the migratory metal particles are continuously accumulated in the edge region of the first ink 103, the migratory metal particles in the middle region of the first ink 103 are continuously reduced, and the phenomenon is also referred to as a "coffee ring" effect. And a first ink mark 105 is formed on the substrate 101, the first ink mark 105 is in a convex structure with a large amount of migratable metal particles stacked in the edge area, a small amount of incompletely migrated metal particles are in the middle area, and the distribution of the migratable metal particles is gradually decreased from the edge area of the first ink mark 105 to the middle area of the first ink mark 105.
Referring to fig. 5, in order to further enhance the "coffee ring" effect, the first ink stamp 105 is then sintered to further volatilize the first solvent, so as to obtain the first conductive unit 110 with a dense structure, i.e., a first annular conductive region 113 is formed in an edge region of the first conductive unit 110, and a first light-transmitting region 111 is formed in a middle region of the first conductive unit 110. Wherein, the thickness of the first annular conductive region 113 of the first conductive unit 110 is thicker than that of the first light transmission region 111, and the distribution of the migratable metal particles decreases from the first annular conductive region 113 to the first light transmission region 111 in sequence. The first light-transmitting region 111 has a small amount of metal particles that have not completely migrated. The first annular conductive region 113 and the first light transmission region 111 located at the middle region of the first annular conductive region 113 are formed through a drying process by controlling parameters of the ink containing the metal particles, such as the amount of the ink used and the shape of the ink that is continuous after printing, thereby forming the first conductive unit 110 in various shapes, such as a circle or an ellipse.
In one embodiment, ink containing metal particles is printed on a substrate at intervals, and is dried to obtain a plurality of circular first conductive units 110, and during the drying process, the edges of the ink are stacked to form a first annular conductive region 113 and a first circular light-transmitting region surrounded by the first annular conductive region 113.
In one embodiment, the volume of the first ink 103 is 7pL-20 pL. The amount of the first conductive element 110 is reasonably limited, and the first conductive element has a distinct edge protrusion structure.
In one embodiment, the drying temperature is 40-70 ℃ and the drying time is 60-120 s during the drying of the substrate 101 printed with the first ink 103. Within this temperature and time range, the first solvent is more easily volatilized and more metal particles are carried to the first annular conductive region 113 of the first conductive unit 110.
Further, after the substrate 101 printed with the first ink 103 is dried, a sintering process is further included, so that the first conductive unit 110 is obtained. Furthermore, the sintering temperature is 120-200 ℃, and the sintering time is 10-30 min. In this temperature and time range, the formation of the first conductive unit having a dense structure is more facilitated.
And S2, printing ink containing conductive materials and at least partially overlapped with the adjacent first conductive units among the plurality of first conductive units, and drying to obtain a second plurality of conductive units, wherein the second conductive units are mutually connected with the first conductive units to form a grid electrode, and in the drying process, the conductive materials in the ink are accumulated at the edge of the ink to form a second conductive area of the second conductive unit, and the second conductive area surrounds to form a second light-transmitting area.
In the step of printing the conductive material-containing ink at least partially overlapping adjacent ones of the first conductive elements between ones of the first conductive elements, the conductive material-containing ink at least partially overlapping adjacent ones of the first conductive elements is printed in interstitial regions between ones of the first conductive elements. And the rapid formation of the grid electrode is facilitated.
In one embodiment, to better illustrate the preparation process of the metal grid electrode of the present application, an ink containing a conductive material, which at least partially overlaps adjacent first conductive elements, is printed between the first conductive elements, which is referred to as a second ink.
Specifically, a plurality of second inks 203 containing conductive materials are printed in gap regions 120 between a plurality of first conductive units 110, and then dried to obtain second ink marks 205, the second ink marks 205 are sintered to obtain second conductive units 210 corresponding to the second inks 203, and the sintered second conductive units 210 connect adjacent first conductive units 110 to form a grid electrode.
In one embodiment, the second ink 203 is printed by using an inkjet printing method, and the inkjet printing process is to print a plurality of second inks 203 at intervals to form a regular ink array, so that the finally formed second conductive units 210 are arranged in an array.
In one embodiment, the second ink 203 includes a second solvent and a conductive material that can migrate with the second solvent.
In one embodiment, the conductive material in the second ink 203 is selected from at least one of metal particles and carbon nanotubes.
When the conductive material is selected from carbon nanotubes, the length of the carbon nanotubes in the second ink 203 is 10nm to 100nm, and the cross-sectional diameter is 0.5nm to 20 nm.
In the present embodiment, when the conductive material is selected from carbon nanotubes, the second solvent is selected from at least one of chloroform, o-dichlorobenzene, N-Dimethylformamide (DMF), and N-methylpyrrolidone (NMP).
In this embodiment, the mass percentage of the carbon nanotubes in the second ink 203 is 0.1% to 1.5%. Within this range, the second solvent is more favorable to carry more carbon nanotubes to the edge of the second ink 203.
When the conductive material is selected from metal particles, the metal particles in the second ink 203 have a particle size ranging from 10nm to 100 nm. Within this size range, migration of the metal particles with the solvent is more facilitated.
In the present embodiment, when the conductive material is selected from the metal particles, the second solvent is selected from at least one of ethanol, cyclohexane, toluene, xylene, and anisole. Furthermore, the second solvent is toluene, which is more favorable for carrying metal particles to migrate.
In this embodiment, the material of the metal nanoparticles in the second ink 203 is selected from silver, copper, aluminum, and the like, which have good conductivity. Further, the material of the metal nanoparticles in the second ink 203 is selected from silver, and the silver as the migratable metal nanoparticles has better stability and light transmittance in the environment of normal temperature and pressure, which is beneficial to forming a metal grid electrode with excellent performance.
In this embodiment, the metal particles in the second ink 203 account for 0.3% to 5% by mass of the second ink 203. Within this range, the second solvent is more favorable to carry more migrateable metal particles to the edge of the second ink 203.
Similar to forming the first conductive element 110, the second conductive element 210 is also formed based on the "coffee ring" effect. Describing the preparation process of the second conductive unit 210 according to one embodiment, when the substrate 101 printed with the second ink 203 is dried, the second solvent contained in the second ink 203 is volatilized continuously, the volatilization speed of the second solvent in the edge region of the second ink 203 is faster than that of the second solvent in the middle region of the second ink 203, after the second solvent in the edge region is volatilized, the second solvent in the middle region drives the migrateable metal particles in the middle region to move to the edge region of the second ink 203 for replenishment, the migrateable metal particles in the edge region of the second ink 203 are accumulated continuously, and the metal particles in the middle region of the second ink 203 are reduced continuously. A second ink mark 205 is formed on the substrate 101, the second ink mark 205 has a structure of a convex structure with a large amount of metal particles accumulated in the edge area, a small amount of incompletely migrated metal particles are in the middle area, and the distribution of the metal particles is gradually decreased from the edge area of the second ink mark 205 to the middle area of the second ink mark 205.
Referring to fig. 6, in order to further enhance the "coffee ring" effect, the second ink mark 205 is then sintered to further volatilize the second solvent, so as to obtain the second conductive unit 210 with a dense structure, i.e., a second annular conductive region 213 is formed in the edge region of the second conductive unit 210, and a second light-transmitting region 211 is formed in the middle region of the second conductive unit 210. The thickness of the second annular conductive region 213 of the second conductive unit 210 is greater than the thickness of the second light-transmitting region 211, and the distribution of the metal particles decreases from the second annular conductive region 213 to the second light-transmitting region 211. The second light-transmitting region 211 has a small amount of metal particles that have not completely migrated.
In one embodiment, an ink containing a conductive material at least partially overlapping an adjacent first conductive element 110 is printed between the first conductive elements 110, and dried to obtain a plurality of circular second conductive elements 210, and during the drying process, edges of the ink are stacked to form a second annular conductive region 213 and a second circular transparent region surrounded by the second annular conductive region 213.
In one embodiment, the volume of the second ink 203 is 7pL-20 pL. The amount of the second conductive unit 210 is reasonably limited, and the second conductive unit 210 has a distinct edge protrusion structure.
In one embodiment, the drying temperature is 40 ℃ to 70 ℃ and the drying time is 60s to 120s during the drying of the substrate 101 printed with the second ink. Within this temperature and time range, the second solvent is more easily volatilized and more conductive material is carried to the second loop-shaped conductive area 213 of the second conductive unit 210.
Further, after the substrate 101 printed with the second ink is dried, a sintering process is further included, so that the second conductive unit 210 is obtained. Furthermore, the sintering temperature is 120-200 ℃, and the sintering time is 10-30 min. In this temperature and time range, it is more advantageous to form the second conductive unit 210 having a dense structure.
In one embodiment, the ink may be printed and dried to form the grid electrode as many times as necessary, for example: printing a third ink, drying to form a third conductive unit, i.e. to further improve the conductivity of the grid electrode, after the step of S2, performing step S3: and manufacturing a plurality of third conductive units for connecting the adjacent first conductive units and/or the second conductive units.
The first ink, the second ink and the third ink may be the same ink or different inks.
The preparation method of the grid electrode is simple, compared with a photoetching process, the preparation time is short, the production efficiency of the grid electrode is greatly improved, and the grid electrode with small line width can be obtained.
Referring to fig. 7 and 8, the present application also provides a mesh electrode including:
a plurality of conductive units 410, wherein adjacent conductive units 410 are connected with each other;
the conductive unit 410 has a light-transmitting region and a conductive region surrounding the light-transmitting region, the conductive unit 410 contains a conductive material, and the conductive region is a conductive region formed by migration and accumulation of the conductive material.
It can be understood that the conductive materials are different, the prepared grid electrodes are different, when the conductive materials in the first ink and the second ink are metal particles, the formed grid electrodes are metal grid electrodes, and when the conductive materials in the first ink and the second ink are carbon nanotube materials, the formed grid electrodes are carbon nanotube grid electrodes.
In one embodiment, the grid electrode is prepared by the preparation method of the grid electrode, the conductive material is migrated to the edge of the conductive unit, and is stacked to form the conductive area, and the light-transmitting area is formed in the conductive unit. The width of the conductive area of the conductive unit is small, and therefore the display effect and the light transmittance of the light-emitting device with the grid electrode are improved. In this embodiment, the conductive region is a loop conductive region.
In one embodiment, the conductive element 410 is circular in shape, the conductive element 410 has a circular light-transmitting region 411 and an annular conductive region 413 surrounding the circular light-transmitting region, and the width of the conductive region occupies 7% -20% of the length of the radius of the conductive element. It is of course understood that the shape of the conductive element 410 may also be other than circular, for example the shape of the conductive element may be any shape, such as square, oval, etc.
In one embodiment, a plurality of the conductive units 410 are distributed in an array. And a regular patterned grid electrode is formed, so that the grid electrode is more conductive.
In one embodiment, the width of the conductive region is 2 μm to 50 μm. Thereby being beneficial to improving the display effect and the light transmittance of the light-emitting device.
In one embodiment, the conductive region has an average thickness of 300nm to 600 nm. The conductive region in this thickness range has good conductivity.
Referring to fig. 9, the grid electrode of the present application may also be in another structure, which includes a plurality of conductive units 410, and adjacent conductive units 410 are connected to each other; a plurality of conductive elements 410 in an array-like geometric pattern of mesh-structured electrodes.
It is understood that, for the sake of understanding, the present application only lists two specific structural patterns of the grid electrode, and does not represent that the metal grid electrode of the present application is only the two structures.
The utility model provides a simple structure of grid electrode, including a plurality of electrically conductive units, it is adjacent interconnect between the electrically conductive unit, wherein, electrically conductive unit have by conductive material pile up light-transmitting area and around the conducting region in light-transmitting area, its formation process is that conductive material migrates to the edge of electrically conductive unit, piles up and forms the conducting region, and forms light-transmitting area in the inside of electrically conductive unit. The width of the conductive area of the conductive unit is small, and therefore the display effect and the light transmittance of the light-emitting device with the grid electrode are improved.
Referring to fig. 10, the present application also provides a light emitting device including: a substrate 310, a first electrode disposed on the substrate 310, a light emitting layer 313 disposed on the first electrode, and a second electrode 315 disposed on the light emitting layer 313. The first electrode includes a plurality of first sub-electrodes 311 spaced from each other, and the first electrode is a grid electrode as described herein, it can be understood that the second electrode 315 may also be a planar electrode in which a plurality of second electrodes 315 are connected. Specifically, the adjacent first sub-electrodes 311 are spaced apart from each other by the pixel defining layer 314, and even if the distance between the two adjacent pixel defining layers 314 is only about 10 μm, the grid electrode of the present application having a small line width can be accommodated in the gap between the two pixel defining layers 314, that is, a transparent grid electrode is formed in the gap between the two adjacent pixel defining layers 314, and thus, the light transmittance is good. The conductive area of the conventional grid electrode is too wide, so that too many light transmission areas are shielded, the light transmission effect is poor, even too large line width can completely occupy the gap between two adjacent pixel definition layers 314, and light transmission cannot be realized. That is to say, under the same resolution, the light-emitting device comprising the grid electrode of the application has better light transmission effect.
Referring to fig. 11, the present application also provides a light emitting device including: a substrate 310, a first electrode 320 disposed on the substrate 310, a light emitting layer 321 disposed on the first electrode 320, and a second electrode disposed on the light emitting layer 321. The second electrode includes a plurality of second sub-electrodes 323 spaced from each other, and adjacent second sub-electrodes 323 are spaced by a pixel defining layer 324. The first electrode 320 is a mesh electrode as described herein.
It is understood that the light emitting device of the present application may further include other conventional structures, such as a functional layer for transporting electrons, and the like, which are not described in detail herein. In addition, the light emitting device can be an organic light emitting device and also can be a quantum dot light emitting device.
The light-emitting device comprising the grid electrode has good display effect and high light transmittance.
In order to make the objects and advantages of the present application more apparent, the present application is further described in detail with reference to the following examples. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Example 1
A preparation method of a metal grid electrode comprises the following steps:
step 1: and arranging the first ink and the second ink for later use. Wherein the first ink is an ethanol solution containing 0.5 wt% of silver nanoparticles, and the particle size of the silver nanoparticles is 50 nm; the second ink was an ethanol solution containing 0.5 wt% of silver nanoparticles having a particle size of 50 nm.
Step 2: and printing a plurality of first inks on the front surface of the substrate at intervals in an ink-jet printing mode to form an ink array. Wherein, the volume of each first ink is 10pL, and the distance between the centers of two adjacent first inks is 75 nm. And heating the back surface of the substrate to dry the first ink to obtain a first ink mark. Wherein the drying temperature is 50 deg.C, and the drying time is 100 s.
And step 3: and sintering the first ink print to obtain the first conductive unit. Wherein the sintering temperature is 120 ℃, and the sintering time is 20 min.
And 4, step 4: and printing second ink in a gap area among the plurality of first conductive units in an ink-jet printing mode, wherein the volume of each second ink is 10pL, and the distance between the center of each second ink and the center of the adjacent first annular metal wire is 75 nm.
And heating the back surface of the substrate to dry the second ink to obtain a second ink mark. Wherein the drying temperature is 50 deg.C, and the drying time is 100 s.
And 5: and sintering the second ink mark, wherein the sintering temperature is 120 ℃, and the sintering time is 20 min. And obtaining the metal grid electrode.
Example 2
A preparation method of a metal grid electrode comprises the following steps:
step 1: and arranging the first ink and the second ink for later use. Wherein the first ink is a toluene solution containing 1 wt% of silver nanoparticles, and the particle size of the silver nanoparticles is 100 nm; the second ink was a toluene solution containing 1 wt% silver nanoparticles having a particle size of 100 nm.
Step 2: and printing a plurality of first inks on the front surface of the substrate at intervals in an ink-jet printing mode to form an ink array. Wherein, the volume of each first ink is 10pL, and the distance between the centers of two adjacent first inks is 150 nm. And heating the back surface of the substrate to dry the first ink to obtain a first ink mark. Wherein the drying temperature is 70 deg.C, and the drying time is 80 s.
And step 3: and sintering the first ink print to obtain the first conductive unit. Wherein the sintering temperature is 200 ℃, and the sintering time is 15 min.
And 4, step 4: and printing second ink in a gap area among the plurality of first conductive units in an ink-jet printing mode, wherein the volume of each second ink is 10pL, and the distance between the center of each second ink and the center of the adjacent first conductive unit is 150 nm.
And heating the back surface of the substrate to dry the second ink to obtain a second ink mark. Wherein the drying temperature is 70 deg.C, and the drying time is 80 s.
And 5: and sintering the second ink mark, wherein the sintering temperature is 200 ℃, and the sintering time is 15min, so as to obtain the metal grid electrode.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A grid electrode, comprising:
the adjacent conductive units are mutually connected;
the conductive unit is provided with a light-transmitting area and a conductive area surrounding the light-transmitting area, and the conductive area is formed by stacking conductive materials.
2. The grid electrode of claim 1, wherein the conductive element is circular in shape, the conductive element has a circular light-transmitting area and a conductive area surrounding the circular light-transmitting area, and the width of the conductive area is 7% -20% of the length of the radius of the conductive element.
3. The grid electrode according to claim 1 or 2, wherein a plurality of the conductive units are distributed in an array.
4. Grid electrode according to claim 1 or 2, characterized in that the width of the conductive area is 2 μm-50 μm and/or the average thickness of the conductive area is 300nm-600 nm.
5. The grid electrode according to claim 1 or 2, wherein the conductive material is selected from at least one of metal particles and carbon nanotubes.
6. The mesh electrode of claim 5, wherein the carbon nanotubes have a length of 10nm to 100nm and a cross-sectional diameter of 0.5nm to 20 nm.
7. The grid electrode according to claim 5, wherein the metal particles are selected from at least one of nano silver, nano copper and nano aluminum.
8. A preparation method of a grid electrode is characterized by comprising the following steps:
printing ink containing conductive materials on a substrate at intervals, drying to obtain a plurality of first conductive units, and in the drying process, the conductive materials in the ink are stacked at the edge of the ink to form a first conductive area of the first conductive unit and a first light-transmitting area surrounded by the first conductive area;
printing ink containing conductive materials, at least partially overlapped with the adjacent first conductive units, between the plurality of first conductive units, drying to obtain a plurality of second conductive units, wherein the second conductive units are mutually connected with the first conductive units, and in the drying process, the conductive materials in the ink are stacked on the edge of the ink to form a second conductive area of the second conductive unit and a second light-transmitting area surrounded by the second conductive area.
9. The method for preparing a grid electrode according to claim 8, wherein in the step of printing the conductive material-containing ink at least partially overlapping adjacent first conductive elements between the plurality of first conductive elements, the conductive material-containing ink at least partially overlapping adjacent first conductive elements is printed in gap regions between the plurality of first conductive elements.
10. A method for preparing a grid electrode according to claim 8 or 9, wherein the substrate is printed at intervals with an ink comprising a conductive material, the printing being by ink-jet printing, and/or
In the step of printing the ink containing the conductive material at least partially overlapped with the adjacent first conductive units among the plurality of first conductive units, the printing mode is an ink-jet printing mode.
11. A light emitting device, comprising:
a substrate;
a first electrode arranged on the substrate, wherein the first electrode is the grid electrode in any one of claims 1 to 7 or the grid electrode prepared by the preparation method of the grid electrode in any one of claims 8 to 10;
a light emitting layer provided on the first electrode; and
and a second electrode disposed on the light emitting layer.
12. The light-emitting device according to claim 11, wherein the first electrode comprises a plurality of first sub-electrodes spaced apart from each other, and the second electrode comprises a plurality of second sub-electrodes spaced apart from each other.
CN201911323766.2A 2019-12-20 2019-12-20 Grid electrode, preparation method thereof and light-emitting device Pending CN112331796A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090015147A1 (en) * 2007-07-11 2009-01-15 Industrial Technology Research Institute Display element with partition structures in display areas and fabrication method thereof
US20140078416A1 (en) * 2012-05-07 2014-03-20 Lg Chem, Ltd. Transparent conductive polymer electrode formed by inkjet printing, display device including the electrode, and method of manufacturing the electrode
CN105377449A (en) * 2013-07-10 2016-03-02 柯尼卡美能达株式会社 Coating film formation method, base material with transparent conducting film, device and electronic apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090015147A1 (en) * 2007-07-11 2009-01-15 Industrial Technology Research Institute Display element with partition structures in display areas and fabrication method thereof
US20140078416A1 (en) * 2012-05-07 2014-03-20 Lg Chem, Ltd. Transparent conductive polymer electrode formed by inkjet printing, display device including the electrode, and method of manufacturing the electrode
CN105377449A (en) * 2013-07-10 2016-03-02 柯尼卡美能达株式会社 Coating film formation method, base material with transparent conducting film, device and electronic apparatus

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