CN109817656B - Pixel defining layer and preparation method thereof - Google Patents
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- CN109817656B CN109817656B CN201711163186.2A CN201711163186A CN109817656B CN 109817656 B CN109817656 B CN 109817656B CN 201711163186 A CN201711163186 A CN 201711163186A CN 109817656 B CN109817656 B CN 109817656B
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Abstract
The invention discloses a pixel defining layer and a preparation method thereof, wherein the method comprises the following steps: providing an original pixel defining layer having a recess for defining a light emitting cell; providing a mold having a boss, the boss of the mold coinciding with the groove of the pixel defining layer; the boss is horizontally divided into an upper part and a lower part, the outer diameter of the upper part is larger than that of the lower part, a layer of hydrophobic material is formed on the side surface of the upper part, and a layer of hydrophilic material is formed on the side surface of the lower part; and fitting the boss of the mold with the groove of the pixel defining layer to prepare the pixel defining layer with the upper part of the side surface of the groove containing the hydrophobic material layer and the lower part containing the hydrophilic material layer. According to the invention, the hydrophilic and hydrophobic material is coated on the side surface of the boss of the mold, and then transferred to the side surface of the groove of the pixel defining layer through the mold, so that the pixel defining layer structure with the upper part hydrophobic and the lower part hydrophilic is obtained, and the uniformity of the ink-jet printing ink is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel defining layer and a preparation method thereof.
Background
The inkjet printing technology can be applied to the industry of Light Emitting Diode (LED) display panels, and the preparation of the pixel definition layer needs to be completed on the substrate in advance, and in the printing process, in order to effectively print the ink on the substrate (reduce the influence of coffee rings and marangoni flow), and improve the uniformity and resolution of the ink, the pixel definition layer is subjected to surface treatment, such as surface hydrophilicity and hydrophobicity improvement.
Disclosure of Invention
The invention aims to provide a pixel defining layer and a preparation method thereof, and aims to solve the problem that the uniformity of the existing pixel defining layer after ink is printed is not good.
The technical scheme of the invention is as follows:
a method for preparing a pixel defining layer, comprising the steps of:
providing an original pixel defining layer having a recess for defining a light emitting cell;
providing a mold having a boss, the boss of the mold coinciding with the groove of the pixel defining layer;
the boss is horizontally divided into an upper part and a lower part, the outer diameter of the upper part is larger than that of the lower part, a layer of hydrophobic material is formed on the side surface of the upper part, and a layer of hydrophilic material is formed on the side surface of the lower part;
and fitting the boss of the mold with the groove of the pixel defining layer to prepare the pixel defining layer with the upper part of the side surface of the groove containing the hydrophobic material layer and the lower part containing the hydrophilic material layer.
The method for preparing the pixel defining layer, wherein the boss is horizontally divided into an upper part and a lower part, the outer diameter of the upper part is larger than that of the lower part, a layer of hydrophobic material is formed on the side surface of the upper part, and a layer of hydrophilic material is formed on the side surface of the lower part, and the method comprises the following steps:
completely immersing the boss into a hydrophobic material solution, wherein the immersion depth is recorded as h1, and forming a layer of hydrophobic material on the side surface of the boss;
taking out the boss, and then immersing the boss into a cleaning solution, wherein the immersion depth is recorded as h 2;
taking out the boss, and then immersing the boss into a hydrophilic material solution, wherein the immersion depth is recorded as h3, h1 is more than h3 and more than or equal to h2 and more than 0, h1 is more than the boss height, h3 is less than the boss height, a layer of hydrophobic material is formed on the side surface of the upper part, and a layer of hydrophilic material is formed on the side surface of the lower part.
The preparation method of the pixel defining layer is characterized in that the hydrophobic material solution is prepared by dissolving a hydrophobic material in a first solvent;
the hydrophobic material is a flexible polymer;
and/or the first solvent is one or more of dimethylformamide and dimethylsulfoxide.
The method for preparing the pixel defining layer is characterized in that the flexible polymer is one or more of fluorine-containing polyolefin, fluorine-containing polyalkylene oxide and polysiloxane.
The preparation method of the pixel defining layer is characterized in that the hydrophilic material solution is prepared by dissolving a hydrophilic material in a second solvent;
the hydrophilic material is a rigid polymer;
and/or the second solvent is one or more of dichlorotoluene, trichlorotoluene and acetone.
The method for preparing the pixel defining layer, wherein the rigid polymer is one or more of a polymer containing alkyl in a main chain and a polymer containing a cyclic rigid structure in the main chain.
The rigid polymer is polyimide or bisphenol A polycarbonate.
The preparation method of the pixel defining layer comprises the steps of attaching the boss of the mold to the groove of the pixel defining layer, and preparing the pixel defining layer with the part containing the hydrophobic material layer on the side surface of the groove and the part containing the hydrophilic material layer on the lower part under the conditions of heating, ultrasonic oscillation or ultraviolet irradiation.
The preparation method of the pixel defining layer is characterized in that the thickness of the pixel defining layer is 3-5 μm.
The preparation method of the pixel defining layer is characterized in that the thickness of the hydrophobic material covering the groove side of the pixel defining layer is 1.5-2.5 μm.
The invention provides a pixel defining layer, which is prepared by the preparation method of the pixel defining layer.
Has the advantages that: according to the invention, the hydrophilic material and the hydrophobic material on the mold are coated on the side surface of the groove of the pixel defining layer in a transfer-like manner, so that the pixel defining layer with the hydrophobic material on the upper part of the side surface of the groove and the hydrophilic material on the lower part of the side surface of the groove is obtained, and the uniformity of the ink after printing is further improved.
Drawings
FIG. 1 is a schematic structural diagram of an original pixel definition layer according to the present invention.
FIG. 2 is a schematic structural diagram of a pixel defining layer prepared according to the present invention.
Fig. 3 is a schematic flow chart of a method for manufacturing a pixel defining layer according to the present invention.
Detailed Description
The present invention provides a pixel defining layer and a method for making the same, which are further described in detail below to make the objects, technical solutions and effects of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a preparation method of a pixel definition layer, which comprises the following steps:
100. providing an original pixel defining layer having a recess for defining a light emitting cell;
200. providing a mold having a boss, the boss of the mold coinciding with the groove of the pixel defining layer;
300. the boss is horizontally divided into an upper part and a lower part, the outer diameter of the upper part is larger than that of the lower part, a layer of hydrophobic material is formed on the side surface of the upper part, and a layer of hydrophilic material is formed on the side surface of the lower part;
400. and fitting the boss of the mold with the groove of the pixel defining layer to prepare the pixel defining layer with the upper part of the side surface of the groove containing the hydrophobic material layer and the lower part containing the hydrophilic material layer.
The above steps are described in detail below with reference to specific embodiments.
In step 100, the original pixel definition layer can be prepared by: a pixel defining layer with a thickness of 3-5 μm is prepared on the prepared substrate by casting, and 1 is the original pixel defining layer as shown in FIG. 1. The preparation of the pixel defining layer is the prior art, and more specific preparation process is not described herein.
Further, before preparing the original pixel defining layer on the substrate, the method further comprises the following steps: and cleaning the substrate, wherein the cleaning process comprises the following steps: spraying the cleaning solution on the surface of the substrate, brushing the substrate by a brush, introducing the substrate into high-pressure spraying ultrapure water, washing the surface of the substrate, removing residual liquid on the surface of the substrate, and finally drying the substrate by blowing.
In step 200, the mold has a projection that fits into the recess of the pixel defining layer.
In step 300, the boss is horizontally divided into an upper portion and a lower portion, the outer diameter of the upper portion is larger than that of the lower portion, a layer of hydrophobic material is formed on the side surface of the upper portion, and a layer of hydrophilic material is formed on the side surface of the lower portion. The mold provided by the invention has the function similar to a seal in transfer printing, and the pixel defining layer structure with the upper part hydrophobic and the lower part hydrophilic is obtained by coating the side surface of the boss of the mold with the hydrophobic material and the hydrophilic material and then transferring the side surface of the groove of the pixel defining layer through the mold.
As a specific embodiment, the method for horizontally dividing the boss into an upper portion and a lower portion, the upper portion having an outer diameter larger than that of the lower portion, the upper portion having a layer of hydrophobic material formed on a side thereof, and the lower portion having a layer of hydrophilic material formed on a side thereof, includes the steps of:
fixing the die on a positioning device, wherein the die can move up and down and the precision is controlled to be 0.01 mu m;
and completely immersing the boss into the prepared hydrophobic material solution, wherein the immersion depth is recorded as h1, standing for 1-3min, and forming a layer of hydrophobic material on the side surface of the boss. The hydrophobic material solution is prepared by dissolving a hydrophobic material in a first solvent; the hydrophobic material is a flexible polymer, and can be one or more of fluorine-containing polyolefin, fluorine-containing polyalkylene oxide, polysiloxane and the like; the first solvent may be one or more of dimethylformamide, dimethylsulfoxide, and the like. Preferably, the volume of the first solvent is 40% to 70% of the volume of the solution of the hydrophobic material.
After removal, the panels were immersed in the cleaning solution to a depth recorded as h 2. The cleaning solution is used for cleaning a layer of hydrophobic material formed on the lower part of the boss, and the cleaning solution can be a hydrophobic solvent (the hydrophobic solvent can be a hydrocarbon solvent such as toluene, xylene and the like) or a clear aqueous solution and the like, but is not limited thereto.
Taking out the boss, immersing the boss into the prepared hydrophilic material solution, wherein the immersion depth is recorded as h3, h1 is more than h3 and is more than or equal to h2 and more than 0, h1 is more than the boss height, h3 is less than the boss height, standing for 1-3min, forming a layer of hydrophobic material on the side surface of the upper part, and forming a layer of hydrophilic material on the side surface of the lower part. The hydrophilic material solution is prepared by dissolving a hydrophilic material in a second solvent; the hydrophilic material is a rigid polymer, and the rigid polymer is one or more of a polymer containing alkyl in a main chain, a polymer containing a cyclic rigid structure in the main chain and the like, and can be polyimide, bisphenol A polycarbonate for example; the second solvent may be one or more of dichlorotoluene, trichlorotoluene, acetone, and the like. Preferably, the volume of the second solvent is 30-70% of the volume of the hydrophilic material solution.
In step 400, as a specific implementation manner, the boss of the mold is attached to the groove of the pixel defining layer, and under the conditions of heating, ultrasonic oscillation or ultraviolet irradiation, the pixel defining layer in which the upper portion of the side surface of the groove contains the hydrophobic material layer and the lower portion contains the hydrophilic material layer is prepared. Preferably, the heating temperature is 100-150 ℃, and the heating time is 5-10 min. The mold provided by the invention has the function similar to a seal in transfer printing, and the hydrophobic material and the hydrophilic material are coated on the side surface of the boss of the mold, and then are transferred to the side surface of the groove of the pixel defining layer through the mold, so that the pixel defining layer structure with the hydrophobic upper part and the hydrophilic lower part is obtained, and the uniformity of the ink-jet printing ink is improved.
The invention provides a pixel defining layer, which is prepared by the preparation method of the pixel defining layer. As shown in fig. 2, the pixel defining layer of the present invention includes an original pixel defining layer 1, wherein a hydrophobic material layer 2 is formed on a portion of a side surface of a groove of the pixel defining layer, and a hydrophilic material layer 3 is formed on a lower portion of the groove.
The structure of the upper part of the pixel defining layer, which is hydrophobic, and the lower part of the pixel defining layer, changes the wetting characteristic of the pixel defining layer, when the light-emitting unit (comprising a hole functional layer, a light-emitting layer and an electronic functional layer) material is deposited in the groove (pixel area) defined by the pixel defining layer, the upper part of the hydrophobic structure can prevent the solution from flowing to the adjacent pixel area, and the lower part of the hydrophilic structure can improve the surface tension of the solution, so that the solution can be flatly paved in the pixel area defined by the pixel defining layer, the film forming uniformity is improved, the light-emitting quality of the device is improved, and the service life is prolonged.
The thickness of the pixel defining layer is 3-5 μm, wherein the thickness of the hydrophobic material covering the groove side of the pixel defining layer is 1.5-2.5 μm. When each layer structure of the light-emitting unit is deposited, the solution of each layer structure can form a uniform film under the action of the hydrophobic upper side and the hydrophilic lower side.
The invention also provides the application of the pixel defining layer, wherein the pixel defining layer is used for preparing an electroluminescent device.
The pixel defining layer is prepared by the method, and then the QLED device is prepared in an ink-jet printing mode. As a preferred embodiment, a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), a quantum dot light emitting layer (QD), an Electron Transport Layer (ETL), and a back electrode are sequentially deposited in the pixel defining layer groove by using an inkjet printing method. According to the pixel defining layer prepared by the invention, as the upper part of the side surface of the groove of the pixel defining layer has hydrophobicity and the lower part of the side surface of the groove of the pixel defining layer has hydrophilicity, when a QLED device is prepared by adopting an ink-jet printing method, the uniformity of ink can be improved, the performance of the prepared device is more stable, and the process is simple.
The present invention will be described in detail below with reference to examples.
Example 1
The preparation steps of the pixel defining layer of this embodiment are as follows:
1. depositing a layer of pixel defining layer material (positive photoresist) with the thickness of 5 mu m on an ITO glass substrate by adopting a pouring method;
2. the shape of the mold is shown in 4 in fig. 3, then the mold is installed on a positioning device (capable of moving up and down, and the precision can be controlled at 0.01 μm), the mold is descended by 5 μm and is immersed into a polysiloxane and dimethylformamide solution (a hydrophobic material solution), wherein the volume of dimethylformamide accounts for 40% of the total volume, the mold is kept still for 1min and is taken out, the mold is descended by 3 μm and is put into clear water for cleaning, then the mold is taken out and descended by 3 μm and is immersed into a polyimide and dichlorotoluene solution (a hydrophilic material solution), wherein the volume of dichlorotoluene accounts for 30% of the total volume, the mold is taken out after the standing for 1min, a layer of hydrophobic material is formed on the upper part side surface of a boss of the mold, a layer of hydrophilic material;
3. and (3) attaching the boss of the mold coated with the hydrophilic and hydrophobic material to the groove of the pixel defining layer poured before, heating at 100 ℃ for 5min, and taking out the mold, thereby obtaining the pixel defining layer with the hydrophobic upper part and the hydrophilic lower part.
The preparation steps of the QLED device of this embodiment are as follows:
and depositing a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), a quantum dot light-emitting layer (QD), an Electron Transport Layer (ETL) and a back electrode on the prepared pixel defining layer by adopting an ink-jet printing technology in sequence.
Example 2
The preparation steps of the pixel defining layer of this embodiment are as follows:
1. depositing a layer of pixel defining layer material (positive photoresist) with the thickness of 5 mu m on an ITO glass substrate by adopting a pouring method;
2. the shape of the mold is shown in 4 in fig. 3, then the mold is installed on a positioning device (capable of moving up and down, and the precision can be controlled at 0.01 μm), the mold is descended by 5 μm and is immersed into a polysiloxane and dimethylformamide solution (a hydrophobic material solution), wherein the volume of dimethylformamide accounts for 50% of the total volume, the mold is kept still for 1min and is taken out, the mold is descended by 3 μm and is put into clear water for cleaning, then the mold is taken out and descended by 3 μm and is immersed into a polyimide and dichlorotoluene solution (a hydrophilic material solution), wherein the volume of dichlorotoluene accounts for 50% of the total volume, the mold is taken out after the standing for 1min, a layer of hydrophobic material is formed on the upper part side surface of a boss of the mold, a layer of hydrophilic material;
3. and (3) attaching the boss of the mold coated with the hydrophilic and hydrophobic material to the groove of the pixel defining layer poured before, heating at 100 ℃ for 5min, and taking out the mold, thereby obtaining the pixel defining layer with the hydrophobic upper part and the hydrophilic lower part.
The preparation steps of the QLED device of this embodiment are as follows:
and depositing a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), a quantum dot light-emitting layer (QD), an Electron Transport Layer (ETL) and a back electrode on the prepared pixel defining layer by adopting an ink-jet printing technology in sequence.
Example 3
The preparation steps of the pixel defining layer of this embodiment are as follows:
1. depositing a layer of pixel defining layer material (positive photoresist) with the thickness of 5 mu m on an ITO glass substrate by adopting a pouring method;
2. the shape of the mold is shown in 4 in fig. 3, then the mold is installed on a positioning device (capable of moving up and down, and the precision can be controlled at 0.01 μm), the mold is descended by 5 μm and is immersed into a polysiloxane and dimethylformamide solution (a hydrophobic material solution), wherein the volume of dimethylformamide accounts for 70% of the total volume, the mold is kept stand for 2min and is taken out, the mold is descended by 3 μm and is put into clear water for cleaning, then the mold is taken out and descended by 3 μm and is immersed into a polyimide and dichlorotoluene solution (a hydrophilic material solution), wherein the volume of dichlorotoluene accounts for 70% of the total volume, the mold is taken out after standing for 3min, a layer of hydrophobic material is formed on the upper part side surface of a boss of the mold, a layer of hydrophilic material is;
3. and (3) attaching the boss of the mold coated with the hydrophilic and hydrophobic material to the groove of the pixel defining layer poured before, heating at 100 ℃ for 5min, and taking out the mold, thereby obtaining the pixel defining layer with the hydrophobic upper part and the hydrophilic lower part.
The preparation steps of the QLED device of this embodiment are as follows:
and depositing a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), a quantum dot light-emitting layer (QD), an Electron Transport Layer (ETL) and a back electrode on the prepared pixel defining layer by adopting an ink-jet printing technology in sequence.
In summary, according to the pixel defining layer and the preparation method provided by the invention, the mold plays a role similar to a stamp in transfer printing, and the hydrophobic material and the hydrophilic material are coated on the side surface of the boss of the mold and then transferred to the side surface of the groove of the pixel defining layer through the mold, so that the pixel defining layer structure with the hydrophobic upper part and the hydrophilic lower part is obtained, and the uniformity of the ink-jet printing ink is improved. The method is adopted to prepare the pixel defining layer with the upper part being hydrophobic and the lower part being hydrophilic, and then the QLED device is prepared in an ink-jet printing mode, so that the process is simple, and the performance of the prepared device is more stable.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A method for preparing a pixel defining layer, comprising the steps of: providing an original pixel defining layer having a recess for defining a light emitting cell;
providing a mold having a boss, the boss of the mold coinciding with the groove of the pixel defining layer;
the boss is horizontally divided into an upper part and a lower part, the outer diameter of the upper part is larger than that of the lower part, a layer of hydrophobic material is formed on the side surface of the upper part, and a layer of hydrophilic material is formed on the side surface of the lower part;
attaching the boss of the mold to the groove of the pixel defining layer to prepare the pixel defining layer with the upper part of the side surface of the groove containing the hydrophobic material layer and the lower part containing the hydrophilic material layer;
a method of forming a layer of hydrophobic material on the side of said upper portion and a layer of hydrophilic material on the side of said lower portion, comprising the steps of:
completely immersing the boss into a hydrophobic material solution, wherein the immersion depth is recorded as h1, and forming a layer of hydrophobic material on the side surface of the boss;
taking out the boss, and then immersing the boss into a cleaning solution, wherein the immersion depth is recorded as h 2;
taking out the boss, and then immersing the boss into a hydrophilic material solution, wherein the immersion depth is recorded as h3, h1 is more than h3 and more than or equal to h2 and more than 0, h1 is more than the boss height, h3 is less than the boss height, a layer of hydrophobic material is formed on the side surface of the upper part, and a layer of hydrophilic material is formed on the side surface of the lower part.
2. The method for manufacturing a pixel defining layer according to claim 1, wherein the hydrophobic material solution is prepared by dissolving a hydrophobic material in a first solvent;
the hydrophobic material is a flexible polymer;
and/or the first solvent is one or more of dimethylformamide and dimethylsulfoxide.
3. The method of claim 2, wherein the flexible polymer is one or more of a fluorine-containing polyolefin, a fluorine-containing polyalkylene oxide, and a polysiloxane.
4. The method for manufacturing a pixel defining layer according to claim 1, wherein the hydrophilic material solution is configured by dissolving a hydrophilic material in a second solvent;
the hydrophilic material is a rigid polymer;
and/or the second solvent is one or more of dichlorotoluene, trichlorotoluene and acetone.
5. The method for producing a pixel defining layer according to claim 4, wherein the rigid polymer is one or more of a polymer having an alkyl group in a main chain and a polymer having a cyclic rigid structure in a main chain.
6. The method of claim 5, wherein the rigid polymer is polyimide or bisphenol A polycarbonate.
7. The method according to claim 1, wherein the step of attaching the projections of the mold to the grooves of the pixel defining layer to form the pixel defining layer having the hydrophobic material layer on the upper portion of the side surfaces of the grooves and the hydrophilic material layer on the lower portion thereof comprises: and attaching the boss of the mold to the groove of the pixel defining layer, and transferring the hydrophobic material and the hydrophilic material on the side surface of the boss to the side surface of the groove under the conditions of heating, ultrasonic oscillation or ultraviolet irradiation to obtain the pixel defining layer with the upper part of the side surface of the groove containing the hydrophobic material layer and the lower part containing the hydrophilic material layer.
8. The method of claim 1, wherein the thickness of the pixel defining layer is 3-5 μm.
9. The method according to claim 8, wherein the thickness of the hydrophobic material covering the groove side of the pixel defining layer is 1.5-2.5 μm.
10. A pixel defining layer, characterized by being produced by the method for producing a pixel defining layer according to any one of claims 1 to 9.
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