CN112349871B - Metal grid electrode and preparation method thereof - Google Patents
Metal grid electrode and preparation method thereof Download PDFInfo
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- CN112349871B CN112349871B CN201911249343.0A CN201911249343A CN112349871B CN 112349871 B CN112349871 B CN 112349871B CN 201911249343 A CN201911249343 A CN 201911249343A CN 112349871 B CN112349871 B CN 112349871B
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- 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
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- H—ELECTRICITY
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- 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
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- 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
- H10K71/60—Forming conductive regions or layers, e.g. electrodes
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- 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
- H10K71/60—Forming conductive regions or layers, e.g. electrodes
- H10K71/611—Forming conductive regions or layers, e.g. electrodes using printing deposition, e.g. ink jet printing
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Abstract
The application relates to a metal grid electrode and a preparation method thereof, wherein the preparation method of the metal grid electrode comprises the following steps: printing a plurality of mutually spaced ink strings in a first direction of a substrate, wherein the ink strings are formed by connecting a plurality of inks containing metal particles, and drying the ink strings to obtain a first runway-shaped conductive unit; the method comprises the steps of printing a plurality of ink strings which are mutually spaced in the second direction of the substrate, wherein the ink strings are formed by connecting a plurality of inks containing metal particles, drying the ink strings to obtain second runway-shaped conductive units, and connecting any adjacent first runway-shaped conductive units through the second runway-shaped conductive units.
Description
Technical Field
The application relates to the technical field of display, in particular to a metal grid electrode and a preparation method thereof.
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 transmittance and electrical conductivity are generally selected as electrodes of organic light emitting diodes. 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 been developed because of their disadvantages such as high resistance, poor flexibility, and high reflectivity. Therefore, a metal 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.
Although the conventional inkjet printing method can directly pattern and print the metal grid electrode on the substrate, the conductive area of the prepared metal grid electrode is too wide, and thus the electroluminescent device comprising the metal grid electrode has poor visual effect and low light transmittance.
Disclosure of Invention
Based on this, it is necessary to provide a method for preparing a metal grid electrode with a small conductive area, aiming at the problem that the conductive area of the metal grid electrode prepared by the traditional ink-jet printing method is too large.
A preparation method of a metal grid electrode comprises the following steps:
printing a plurality of mutually spaced ink strings in a first direction of a substrate, wherein the ink strings are formed by connecting a plurality of inks containing metal particles, and drying the ink strings to obtain a first runway-shaped conductive unit;
printing a plurality of mutually spaced ink strings in the second direction of the substrate, wherein the ink strings are formed by connecting a plurality of inks containing metal particles, drying the ink strings to obtain second runway-shaped conductive units, and connecting any adjacent first runway-shaped conductive units through the second runway-shaped conductive units.
In one embodiment, the first racetrack conductive element and the second racetrack conductive element are interdigitated.
In one embodiment, the step of printing a plurality of spaced ink strings in a first direction on the substrate comprises: printing a plurality of ink strings parallel to each other in a first direction of a substrate.
In one embodiment, the step of printing a plurality of spaced ink strings in the second direction on the substrate comprises: printing a plurality of ink strings parallel to each other in a second direction of the substrate.
In one embodiment, in the step of printing the plurality of ink strings spaced apart from each other in the second direction of the substrate, a plurality of ink strings perpendicular to the first racetrack-type conductive element are printed on the substrate.
In one embodiment, in the step of drying the ink string to obtain the first track-shaped conductive element, the edge area of the ink string is dried to obtain the first track-shaped conductive element; and/or in the step of drying the ink string to obtain the second track-type conductive unit, drying the edge area of the ink string to obtain the second track-type conductive unit.
In one embodiment, in the step of drying the edge area of the ink string to obtain the first track-type conductive unit, the middle area of the ink string is shielded, and the edge area of the ink string is subjected to heating treatment to obtain the first track-type conductive unit; and/or in the step of drying the edge area of the ink string to obtain a second track-type conductive unit, shielding the middle area of the ink string, and heating the edge area of the ink string to obtain the second track-type conductive unit.
In one embodiment, in the step of heating the edge area of the ink string to obtain the first track-type conductive unit, the shielded middle area of the ink string accounts for 75% -90% of the area of the ink string, and/or in the step of heating the edge area of the ink string to obtain the second track-type conductive unit, the shielded middle area of the ink string accounts for 75% -90% of the area of the ink string.
In one embodiment, in the step of heating the edge area of the ink string to obtain the first track-type conductive element, the heating is infrared heating; and/or in the step of heating the edge area of the ink string to obtain the second track-type conductive unit, the heating treatment is infrared heating.
In one embodiment, in the step of printing a plurality of ink strings spaced from each other in a first direction of the substrate, the printing mode is an ink-jet printing mode; and/or printing a plurality of ink strings which are mutually spaced in the second direction of the substrate in an ink jet printing mode.
In one embodiment, the metal particles in the ink string are selected from at least one of nano silver, nano copper and nano aluminum.
The application also provides a metal grid electrode which is prepared by the preparation method of the metal grid electrode.
An electroluminescent device comprises the metal grid electrode prepared by the preparation method or the metal grid electrode.
The inventor of the application finds that the poor visual effect and low light transmittance of the traditional metal grid electrode are mainly caused by the fact that the width of a conductive region of the metal grid electrode prepared by the traditional method is too large, the width of a conductive point region of the metal grid electrode is too large, and the fineness is reduced, so that the display effect of an electroluminescent 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 preparation method of the metal grid electrode is simple, in the drying process, metal particles in the ink string migrate to the edge of the ink string, the track-shaped conductive units are finally formed, and adjacent first track-shaped conductive units are connected with one another through second track-shaped conductive units. The conductive area of the metal grid electrode formed by the method is small in width, so that the display effect and the light transmittance of an electroluminescent device containing the metal grid electrode can be improved.
Drawings
Fig. 1 is a flowchart of a method for manufacturing a metal grid electrode according to an embodiment.
Fig. 2 is a schematic cross-sectional view illustrating a process of forming the first racetrack-type conductive element according to an embodiment.
Fig. 3 is a partially enlarged view of the first racetrack conductive element in one embodiment.
Fig. 4 to 5 are top views illustrating a process of forming the first track-type conductive element.
FIG. 6 is a schematic cross-sectional view illustrating heating of an edge region of a first ink jet stream in one embodiment.
Fig. 7 is a schematic cross-sectional view illustrating a process of forming the second racetrack conductive element according to an embodiment.
Fig. 8 is a partially enlarged view of a second racetrack conductive element according to one embodiment.
Fig. 9 to 10 are plan views illustrating a process of forming the second racetrack-type conductive element.
FIG. 11 is a schematic top view of a metal mesh electrode according to an embodiment.
Fig. 12 is a schematic top view of a metal mesh electrode according to another embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. 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 embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not 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.
An embodiment of the present application provides a method for manufacturing a metal grid electrode, which includes the following steps:
s1, printing a plurality of spaced ink strings in a first direction of a substrate, wherein the ink strings are formed by connecting a plurality of inks containing metal particles, and drying the ink strings to obtain a first runway-type conductive unit.
For convenience of description, the ink train for preparing the first racetrack-type conductive element described above is referred to as a first ink train in this application. Specifically, referring to fig. 1 and fig. 2, a substrate 101 is provided, a plurality of first ink strings 103 spaced from each other are printed on the substrate 101, the first ink strings 103 are formed by connecting a plurality of inks containing metal particles, the first ink strings 103 are dried to obtain first ink marks 105 corresponding to the first ink strings 103, and the drying process is continued, so that the first ink marks 105 form first racetrack-type conductive units 110.
In this embodiment, as shown in fig. 3, the first racetrack-type conductive element 110 described in this application has a closed ring shape formed by two parallel long sides and a circular arc edge connecting the two long sides, and the first racetrack-type conductive element 110 is in a racetrack shape.
In one embodiment, the first ink strings 103 are printed by inkjet printing.
In one embodiment, the first ink train 103 includes a first solvent and metal particles that are mobile with the first solvent.
In one embodiment, the first solvent is selected from at least one of ethanol, phenylhexane, toluene, xylene, and anisole. Furthermore, the first solvent is toluene, which is more favorable for carrying the metal particles to move.
In one embodiment, the metal particles in the first ink jet 103 have a particle size in a range between 10nm and 100 nm. Within this size range, migration of the metal particles with the solvent is more facilitated.
In one embodiment, the material of the metal nanoparticles in the first ink string 103 is selected from at least one of nano silver, nano copper and nano aluminum with good conductivity. Under the environment of normal temperature and normal pressure, the material has better stability and light transmittance, and is beneficial to forming a metal grid electrode with excellent performance.
In one embodiment, the metal particles in the first ink stick 103 account for 0.3-5% of the first ink stick 103 by mass. Within this range, the first solvent is more favorable to carry more metal particles to the edge of the first ink cluster 103.
Referring now to fig. 4 and 5 with emphasis on the fabrication of the first racetrack conductive element, the principles of the present application are illustrated as follows:
in the process of drying the first ink string 103 to obtain the first racetrack-type conductive unit 110, the first solvent contained in the first ink string 103 is continuously volatilized, and the surface tension of the edge area of the first ink string 103 is smaller than that of the middle area of the first ink string, so that the volatilization speed of the first solvent of the edge area of the first ink string 103 is higher than that of the middle area of the first ink string 103. After the first solvent in the edge region is volatilized, the first solvent in the middle region drives the metal particles in the middle region to move to the edge region of the first ink string 103 for replenishment, the metal particles are continuously accumulated in the edge region of the first ink string 103, the metal particles in the middle region of the first ink string 103 are continuously reduced, and then the first ink mark 105 is obtained, which is also called a "coffee ring" effect. The first solvent is continuously volatilized, and finally, the first conductive region 113 is formed at the edge region of the first racetrack-type conductive element 110, and the first light-transmitting region 111 is formed at the central region of the first racetrack-type conductive element 110.
In one embodiment, in the step of drying the first ink string to obtain the first racetrack-type conductive element, the edge area of the first ink string is dried to obtain the first racetrack-type conductive element, and the edge drying is more favorable for forming a coffee ring effect.
Further, in the step of drying the first ink string to obtain the first racetrack-type conductive unit, the edge area of the first ink string is dried first, and then is sintered to obtain the first racetrack-type conductive unit with a compact structure. Furthermore, the sintering temperature is 120-200 ℃, and the sintering time is 10-30 min. In the temperature and time range, the first track type conductive unit with a compact structure is more favorably formed.
Referring more particularly to fig. 6, the edge region of the first ink jet 103 is further heated for better heating. Firstly, taking a heat insulation plate 201, placing the heat insulation plate 201 above a first ink string 103, adjusting the position of the heat insulation plate 201 to ensure that a gap is formed between the heat insulation plate 201 and the first ink string 103, and shielding the middle area of the first ink string 103 by using the heat insulation plate 201.
Then, a heat source 210 is taken, the heat source 210 is arranged corresponding to the edge area of the first ink string 103, the heat source 210 is located on one side of the heat insulation board 201, namely, the side far away from the substrate 101, and then the heat source 210 is used for heating the edge area of the first ink string 103.
It is understood that the insulation board 201 may be a plurality of insulation boards corresponding to the plurality of first ink strings 103 one to one. The heat insulation board 201 may also be a whole board, and a plurality of strip-shaped apertures 203 corresponding to the edge area of the first ink string 103 are opened on the heat insulation board 201.
In one embodiment, the heating source 210 is an infrared heater, i.e., the edge region of the first ink string 103 that is not covered is heated by the radiation heat of the infrared heater, and the central region of the first ink string 103 is shielded by the heat shield plate 201, i.e., the temperature difference is formed between the edge region and the central region of the first ink string 103. Infrared heating facilitates faster solvent evaporation in the edge region of the first ink jet 103. Further, the heating temperature of the infrared heater is set to 60 ℃ to 90 ℃. This temperature range is more favorable for the first solvent to carry more metal particles toward the edge area of the first ink train 103.
In one embodiment, the gap between the thermal shield 201 and the first ink jet 103 is adjusted to be 50 μm to 70 μm. This range is more suitable for the first solvent in the edge region of the first ink cluster 103 to evaporate.
In one embodiment, in the step of shielding the middle region of the first ink ribbon 103 with the heat shield 201, the shielded middle region of the first ink ribbon 103 occupies 75% to 90% of the area of the first ink ribbon 103. The first solvent in the edge area of the first ink string 103 is volatilized rapidly, so that more metal particles are carried to migrate and accumulate in the first conductive area 113 of the first racetrack-type conductive unit 110.
S2, printing a plurality of mutually spaced ink strings in the second direction of the substrate, wherein the ink strings are formed by connecting a plurality of inks containing metal particles, drying the ink strings to obtain second runway-shaped conductive units, and connecting any adjacent first runway-shaped conductive units through the second runway-shaped conductive units.
It is understood that the first direction and the second direction are two intersecting directions.
For convenience of description, the ink string for preparing the second racetrack-type conductive element is referred to as a second ink string in the present application, and the terms "first ink string" and "second ink string" in the present application are only provided for the applicant to clearly explain the technical solutions of the present application, and it is understood that the material of the metal nanoparticles in the second ink string 303 is also selected from at least one of nano silver, nano copper and nano aluminum with good conductivity. More specifically, the specific materials selected for the first ink string 103 and the second ink string 303 may be the same or different. Further, the second ink cluster 303 is the same as the first ink cluster 103 in terms of the material of the metal nanoparticles. And the metal grid electrode with good performance is formed.
Specifically, referring to fig. 1 and 7, a plurality of second ink strings 303 are printed at intervals in an area formed by a plurality of first racetrack-type conductive units 110 on the substrate 101, the second ink strings 303 are formed by connecting a plurality of inks containing metal particles, the second ink strings 303 are dried to obtain second ink marks 305 corresponding to the second ink strings 303, the second ink marks 305 are continuously dried to form second racetrack-type conductive units 310, and any adjacent first racetrack-type conductive units 110 are connected through the second racetrack-type conductive units 310 to form metal grid electrodes.
In this embodiment, as shown in fig. 8, the second racetrack-type conductive element 310 described in this application has a closed loop shape formed by connecting two parallel long sides and a circular arc-shaped edge connecting the two long sides, and the second racetrack-type conductive element 310 is in the shape of a racetrack.
In one embodiment, the plurality of second ink strings 303 are printed by inkjet printing.
In one embodiment, the second ink jet 303 includes a second solvent and metal particles that are mobile with the second solvent.
In one embodiment, the second solvent is selected from at least one of ethanol, phenylhexane, toluene, xylene, and anisole. Furthermore, the second solvent is toluene, which is more favorable for carrying metal particles to migrate.
In one embodiment, the metal particles in the second ink jet 303 have a particle size in the range of 10nm to 100 nm. In this size range, the migration of the metal particles with the solvent is more facilitated.
In one embodiment, the material of the metal nanoparticles in the second ink string 303 is selected from at least one of nano silver, nano copper and nano aluminum with good conductivity. Under the environment of normal temperature and normal pressure, the material has better stability and light transmittance, and is beneficial to forming a metal grid electrode with excellent performance.
In one embodiment, the metal particles in the second ink stick 303 account for 0.3% to 5% of the second ink stick 303 by mass. Within this range, the second solvent is more favorable to carry more metal particles to the edge of the second ink cluster 303.
Referring with emphasis to fig. 9 and 10, the process of making the second racetrack conductive element will now be described in conjunction with the principles of the present application:
during the process of drying the second ink string 303 to obtain the second racetrack-type conductive unit 310, the second solvent contained in the second ink string 303 is volatilized continuously, and the volatilization speed of the second solvent in the edge area of the second ink string 303 is faster than that in the middle area of the second ink string 303 because the surface tension of the edge area of the second ink string 303 is smaller than that in the middle area of the second ink string 303. After the second solvent in the edge region is volatilized, the second solvent in the middle region drives the metal particles in the middle region to move to the edge region of the second ink string 303 for replenishment, the metal particles are continuously accumulated in the edge region of the second ink string 303, the metal particles in the middle region of the second ink string 303 are continuously reduced, and then the second ink mark 305 is obtained, which is also called a "coffee ring" effect. And then the second solvent is continuously volatilized, so that a second conductive area 313 is finally formed at the edge area of the second racetrack-type conductive element 310, a second light-transmitting area 311 is formed at the middle area of the second racetrack-type conductive element 310, and any adjacent first racetrack-type conductive elements 110 are connected through the second racetrack-type conductive element 310.
In one embodiment, in the step of drying the ink string to obtain the second racetrack-type conductive element, the edge area of the ink string is dried to obtain the second racetrack-type conductive element, and the edge drying is more favorable for forming a coffee ring effect.
In one embodiment, in the step of drying the second ink string to obtain the second racetrack-type conductive unit, the edge area of the second ink string is dried first, and then is sintered to obtain the second racetrack-type conductive unit with a compact structure. Further, the sintering temperature is 120-200 ℃, and the sintering time is 10-30 min. In the temperature and time range, the second runway type conductive unit with a compact structure is more favorably formed.
In one embodiment, in the step of drying the edge area of the second ink string to obtain the second racetrack-type conductive unit, the middle area of the second ink string 303 is shielded, and the edge area of the second ink string 303 is heated to obtain the second racetrack-type conductive unit, so that the solvent evaporation speed in the edge area of the second ink string 303 can be further increased, thereby enhancing the "coffee ring" effect and making the width of the conductive area of the finally obtained metal grid electrode smaller.
Further, the edge area of the second ink stick 303 is heated for better heating. Firstly, taking a heat insulation plate 201, placing the heat insulation plate 201 above a second ink string 303, adjusting the position of the heat insulation plate 201 to ensure that a gap is reserved between the heat insulation plate 201 and the second ink string 303, and shielding the middle area of the second ink string 303 by using the heat insulation plate 201.
Then, a heating source 210 is taken, the heating source 210 is arranged corresponding to the edge area of the second ink string 303, the heating source 210 is located on one side of the heat insulation plate, namely, on the side far away from the substrate 101, and then the heating source 210 is used for heating the edge area of the second ink string 303.
In one embodiment, the heating source is an infrared heater, i.e., the edge region of the uncovered second ink string 303 is heated by the radiation heat of the infrared heater, and the middle region of the second ink string 303 is shielded by a heat shield, i.e., a temperature difference is formed between the edge region and the middle region of the second ink string 303. Infrared heating facilitates faster solvent evaporation in the edge region of the second ink jet 303. Further, the heating temperature of the infrared heater is set to 60 ℃ to 90 ℃. This temperature range is more favorable for the second solvent to carry more metal particles towards the edge region of the second ink jet 303.
In one embodiment, the gap between the thermal shield 201 and the second ink jet 303 is adjusted to be 50 μm to 70 μm. This range is more suitable for the second solvent in the edge region of the second ink jet 303 to evaporate.
In one embodiment, in the step of shielding the middle region of the second ink stick 303 by the heat shield 201, the shielded middle region of the second ink stick 303 occupies 75% to 90% of the area of the second ink stick 303. The second solvent in the edge area of the second ink cluster 303 is volatilized rapidly, so that more metal particles are carried to migrate and accumulate in the second conductive area 313 of the second racetrack-type conductive unit 310.
In one embodiment, the step of printing a plurality of spaced ink strings in a first direction on a substrate comprises: several mutually parallel ink strings, such as a first ink string 103, are printed in a first direction of the substrate. In another embodiment, the step of printing a plurality of spaced ink strings in a second direction on the substrate comprises: several mutually parallel ink strings, such as a second ink string 303, are printed in a second direction of the substrate.
Further, in the step of printing the plurality of ink strings spaced apart from each other in the second direction of the substrate, a plurality of second ink strings 303 perpendicular to the first racetrack-type conductive elements 110 are printed on the substrate. At this time, the first direction and the second direction are two directions perpendicular to each other, and the shape of the finally formed metal mesh electrode is a square mesh shape, that is, the first racetrack-type conductive element 110 and the second racetrack-type conductive element 310 of the metal mesh electrode are perpendicularly crossed, see fig. 11. It will of course be appreciated that it is also possible to print a second ink train 303 which is not perpendicular to the first ink train 103.
The preparation method of the metal grid electrode is simple, in the drying process, metal particles in the ink string migrate to the edge of the ink string, and finally the runway-type conductive units are formed, and adjacent first runway-type conductive units are connected with each other through second runway-type conductive units. The conductive area of the metal grid electrode formed by the method is small in width, so that the display effect and the light transmittance of an electroluminescent device containing the metal grid electrode can be improved.
The application also provides a metal grid electrode which is prepared by the preparation method of the metal grid electrode.
It can be understood that, in the preparation process of the metal grid electrode of the present application, when the second ink string is printed, the second ink string may be printed perpendicular to the first racetrack-type conductive unit, and the structure of the obtained metal grid electrode is the structure style of fig. 10; the second ink string may not be printed perpendicularly to the first racetrack-shaped conductive elements, and only the adjacent first racetrack-shaped conductive elements are connected by the second ink string, so that the structure of the obtained metal grid electrode is the structure pattern shown in fig. 12.
The application also provides an electroluminescent device, which comprises the metal grid electrode prepared by the preparation method or the metal grid electrode.
The width of the conductive area of the metal grid electrode is small, so that the display effect and the light transmittance of the electroluminescent device can be improved.
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 printing a plurality of first ink strings on the front surface of the substrate in an ink-jet printing mode, wherein the adjacent first ink strings are mutually parallel, and the distance between the adjacent first ink strings is 50 mu m. Wherein the first ink string is an ethanol solution containing 0.5wt% of silver nanoparticles, and the particle size of the silver nanoparticles is 50nm.
Step 2: an insulating panel having a plurality of apertures therein was taken, wherein the width of the apertures was 10 μm. And placing a heat insulation plate on one side of the first ink string, adjusting the distance between the heat insulation plate and the first ink string to be 70 micrometers, and shielding the middle area of the first ink string by using the heat insulation plate, wherein the position of the pore area of the heat insulation plate corresponds to the position of the edge area of the first ink string.
And 3, step 3: and taking an infrared heater, arranging the infrared heater corresponding to the edge area of the first ink string above the heat insulation plate, and then heating the edge area of the first ink string by using the infrared heater. Wherein the heating temperature is 70 deg.C, and the heating time is 100s.
And 4, step 4: and then sintering is carried out to obtain the first runway-type conductive unit. Wherein the sintering temperature is 120 ℃, and the sintering time is 10min.
And 5: and printing a plurality of second ink strings on the front surface of the substrate in an ink-jet printing mode, wherein the distance between every two adjacent second ink strings is 50 mu m, and the second ink strings are perpendicular to the first track-type conductive units. Wherein the second ink string is an ethanol solution containing 0.5wt% of silver nanoparticles, and the particle size of the silver nanoparticles is 50nm.
Step 6: and placing a heat insulation plate above the second ink string, adjusting the distance between the heat insulation plate and the second ink string to be 70 mu m, and shielding the middle area of the second ink string by using the heat insulation plate.
And 7: and taking a heating source, correspondingly arranging the heating source and the edge area of the second ink string, wherein the heating source is positioned above the heat insulation plate, and then heating the edge area of the second ink string by using the heating source. Wherein the heating temperature is 70 ℃ and the heating time is 100s.
And step 8: and sintering to obtain the fence-shaped metal grid electrode. Wherein the sintering temperature is 120 ℃, and the sintering time is 15min.
Example 2
A preparation method of a metal grid electrode comprises the following steps:
step 1: and printing a plurality of first ink strings on the front surface of the substrate in an ink-jet printing mode, wherein the adjacent first ink strings are mutually parallel, and the distance between the adjacent first ink strings is 20 mu m. Wherein the first ink string is an ethanol solution containing 1wt% of silver nanoparticles, and the particle size of the silver nanoparticles is 50nm.
And 2, step: an insulating panel having a number of apertures was taken, wherein the width of the apertures was 5 μm. And placing a heat insulation plate on one side of the first ink string, adjusting the distance between the heat insulation plate and the first ink string to be 70 mu m, and shielding the middle area of the first ink string by using the heat insulation plate, wherein the position of the pore area of the heat insulation plate corresponds to the position of the edge area of the first ink string.
And step 3: and taking an infrared heater, arranging the infrared heater corresponding to the edge area of the first ink string above the heat insulation plate, and then heating the edge area of the first ink string by using the infrared heater. Wherein the heating temperature is 80 ℃ and the heating time is 80s.
And 4, step 4: and sintering to obtain the first track type conductive unit. Wherein the sintering temperature is 200 ℃, and the sintering time is 10min.
And 5: and printing a plurality of second ink strings on the front surface of the substrate in an ink-jet printing mode, wherein the distance between every two adjacent second ink strings is 20 mu m, and the second ink strings are perpendicular to the first track-type conductive units. Wherein the second ink string is an ethanol solution containing 1wt% of silver nanoparticles, and the particle size of the silver nanoparticles is 50nm.
And 6: and placing a heat insulation plate above a second ink string, adjusting the distance between the heat insulation plate and the second ink string to be 70 mu m, and shielding the middle area of the second ink string by using the heat insulation plate.
And 7: and taking a heating source, correspondingly setting the heating source and the edge area of the second ink string, wherein the heating source is positioned above the heat insulation plate, and then utilizing the heating source to heat the edge area of the second ink string. Wherein the heating temperature is 80 ℃ and the heating time is 80s.
And 8: and sintering to obtain the fence-shaped metal grid electrode. Wherein the sintering temperature is 200 ℃, and the sintering time is 25min.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure 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 preparation method of a metal grid electrode is characterized by comprising the following steps:
printing a plurality of ink strings which are spaced from each other in a first direction of a substrate, wherein each ink string is formed by connecting a plurality of inks containing metal particles, and drying the edge area of each ink string to obtain a corresponding first runway-type conductive unit;
the step of drying the edge area of each ink string to obtain a corresponding first racetrack-type conductive element comprises the following steps: shielding the middle area of each ink string, and heating the edge area of the corresponding ink string to accelerate the solvent volatilization speed in the edge area of the corresponding ink string, so that the width of the obtained conductive area of the metal grid electrode is smaller;
printing a plurality of ink strings which are spaced from each other in a second direction of the substrate, wherein each ink string is formed by connecting a plurality of inks containing metal particles, and drying the edge area of each ink string to obtain a corresponding second runway-type conductive unit;
the step of drying the edge area of each ink string to obtain a corresponding second racetrack-type conductive unit comprises the following steps: shielding the middle area of each ink string, and heating the edge area of the corresponding ink string to accelerate the solvent volatilization speed in the edge area of the corresponding ink string, so that the width of the obtained conductive area of the metal grid electrode is smaller;
any adjacent first track-shaped conductive units are connected through at least one second track-shaped conductive unit.
2. The method of claim 1 wherein each of the first racetrack conductive elements is interdigitated with at least one of the second racetrack conductive elements.
3. A method of making a metal grid electrode according to claim 1, wherein said step of printing a plurality of spaced ink jets in a first direction on a substrate comprises: printing a plurality of parallel ink strings in a first direction of a substrate;
the step of printing a plurality of spaced ink strings in a second direction on the substrate comprises: printing a plurality of ink strings parallel to each other in a second direction of the substrate.
4. A method of forming a metal grid electrode according to claim 3, wherein said step of printing a plurality of spaced ink jets in said second direction on said substrate prints a plurality of ink jets perpendicular to each of said first racetrack conductive elements on said substrate.
5. The method of claim 1, wherein in the step of printing a plurality of spaced ink clusters in a first direction on the substrate, each ink cluster comprises a solvent selected from at least one of ethanol, cyclohexane, toluene, xylene, and anisole; and/or the presence of a gas in the gas,
in the step of printing a plurality of spaced ink clusters in a second direction on the substrate, each of the ink clusters contains a solvent selected from at least one of ethanol, phenylhexane, toluene, xylene, and anisole.
6. The method for preparing a metal grid electrode according to claim 1, wherein in the step of printing a plurality of ink strings spaced from each other in a first direction of a substrate, the metal particles in each ink string account for 0.3-5% of the corresponding ink string by mass; and/or the presence of a gas in the gas,
in the step of printing a plurality of ink strings spaced from each other in a second direction of the substrate, the metal particles in each ink string account for 0.3-5% by mass of the corresponding ink string.
7. The method of claim 1, wherein in the step of heating the edge region of each ink cluster to obtain the corresponding first racetrack-type conductive element, the shielded central region of each ink cluster occupies 75% -90% of the area of the corresponding ink cluster, and/or,
in the step of heating the edge area of each ink string to obtain the corresponding second racetrack-type conductive unit, the shielded middle area of each ink string accounts for 75-90% of the area of the corresponding ink string.
8. The method for preparing a metal grid electrode according to claim 7, wherein in the step of heating the edge region of each ink string to obtain the corresponding first racetrack-type conductive element, the heating is infrared heating; and/or the presence of a gas in the gas,
in the step of heating the edge area of each ink string to obtain a corresponding second racetrack-type conductive element, the heating is infrared heating.
9. The method for preparing a metal grid electrode as claimed in any one of claims 1 to 4, wherein in the step of printing a plurality of ink strings spaced from each other in a first direction on the substrate, the printing is by ink-jet printing; and/or the presence of a gas in the atmosphere,
and in the step of printing a plurality of ink strings spaced from each other in the second direction of the substrate, the printing mode is an ink jet printing mode.
10. The method of any one of claims 1-4, wherein the metal particles in each of the ink strings are selected from at least one of nano silver, nano copper, and nano aluminum.
11. A metal grid electrode, characterized in that it is produced by the method of any one of claims 1 to 10.
12. An electroluminescent device comprising the metal grid electrode produced by the production method according to any one of claims 1 to 10 or the metal grid electrode according to claim 11.
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| CN104584142A (en) * | 2012-08-20 | 2015-04-29 | 柯尼卡美能达株式会社 | Parallel line pattern containing conductive material, parallel line pattern formation method, substrate with transparent conductive film, device and electronic apparatus |
| 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 |
| CN106413917A (en) * | 2014-01-24 | 2017-02-15 | 柯尼卡美能达株式会社 | Pattern formation method, substrate provided with transparent electroconductive film, device, and electronic instrument |
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| US10103347B2 (en) * | 2015-03-06 | 2018-10-16 | Konica Minolta, Inc. | Transparent electrode, method for manufacturing same, and organic electroluminescent element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104584142A (en) * | 2012-08-20 | 2015-04-29 | 柯尼卡美能达株式会社 | Parallel line pattern containing conductive material, parallel line pattern formation method, substrate with transparent conductive film, device and electronic apparatus |
| 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 |
| CN106413917A (en) * | 2014-01-24 | 2017-02-15 | 柯尼卡美能达株式会社 | Pattern formation method, substrate provided with transparent electroconductive film, device, and electronic instrument |
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