CN110993820B - Display panel and manufacturing method thereof, and manufacturing method of electrode - Google Patents
Display panel and manufacturing method thereof, and manufacturing method of electrode Download PDFInfo
- Publication number
- CN110993820B CN110993820B CN201911237258.2A CN201911237258A CN110993820B CN 110993820 B CN110993820 B CN 110993820B CN 201911237258 A CN201911237258 A CN 201911237258A CN 110993820 B CN110993820 B CN 110993820B
- Authority
- CN
- China
- Prior art keywords
- graphene
- electrode
- layer
- nano
- display panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H10K50/81—Anodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The application provides a display panel, a manufacturing method of the display panel and a manufacturing method of an electrode, relates to the technical field of display, and is used for improving the conductivity of a transparent electrode of a flexible OLED display panel under high deformation. The display panel includes a plurality of light emitting devices. The light emitting device includes a first electrode and a second electrode stacked, the first electrode having a work function greater than that of the second electrode. The first electrode comprises a graphene layer, a graphene nanoscroll layer and nano-metal particles. The graphene nanoscroll layer is laminated with the graphene layer. The graphene nanoscroll layer includes a plurality of graphene nanoscrolls having a tubular structure. And the nano metal particles are dispersed in the graphene layer and the graphene nano coil layer.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display panel, a manufacturing method thereof, and a manufacturing method of an electrode.
Background
Organic light-emitting diodes (OLEDs) have the advantages of self-luminescence, low energy consumption, lightness, thinness, high color saturation, and the like, and can be prepared into flexible display devices based on flexible materials. The method is widely applied to various electronic devices including electronic products such as computers, mobile phones and the like.
The transparent electrode in the existing OLED device is mostly prepared from Indium Tin Oxide (ITO), and the ITO electrode has thin film brittleness and poor conductivity under high deformation, which largely hinders the effective application thereof in flexible electronic products.
Disclosure of Invention
The embodiment of the application provides a display panel, a manufacturing method of the display panel and a manufacturing method of an electrode, which are used for improving the conductivity of a transparent electrode of a flexible OLED display panel under high deformation.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
a first aspect of embodiments of the present application provides a display panel. The display panel includes a plurality of light emitting devices. The light emitting device includes a first electrode and a second electrode stacked, the first electrode having a work function greater than that of the second electrode. The first electrode comprises a graphene layer, a graphene nanoscroll layer and nano-metal particles. The graphene nanoscroll layer is laminated with the graphene layer. The graphene nanoscroll layer includes a plurality of graphene nanoscrolls having a tubular structure. And the nano metal particles are dispersed in the graphene layer and the graphene nano coil layer. The display panel that this application embodiment provided has higher flexibility and light transmissivity, passes through the bridging effect of graphite alkene nanometer book under the high deformation, makes graphite alkene electrode keep excellent electric conductivity.
Optionally, the first electrode comprises a first graphene layer and a second graphene layer adjacent to each other. The graphene nanoscroll layer is located between the first graphene layer and the second graphene layer.
Optionally, the material of the nano-metal particles includes at least one of gold, nickel, iridium, and platinum. The work function of the first electrode is greater than 4.7 eV. According to the display panel provided by the embodiment of the application, the first electrode has a higher work function, and holes can be provided for the light-emitting function layer more efficiently.
Optionally, the thickness of the first electrode is 30-1000 nm. The display panel provided by the embodiment of the application has high electrical conductivity and light transmittance.
Optionally, the display panel further includes a substrate for carrying the light emitting device. The material constituting the base substrate is a flexible resin material. According to the display panel provided by the embodiment of the application, the substrate base plate is made of a flexible material and can be used for flexible display.
A second aspect of the embodiments of the present application provides a method for manufacturing an electrode. The manufacturing method of the electrode comprises the following steps: coating a first graphene metal composite solution on a substrate to form a graphene layer, wherein nano metal particles are dispersed in the graphene layer. And spraying the second graphene metal composite solution into a liquid nitrogen bath, and carrying out freeze-drying treatment to form solid particles. And reducing the solid particles to obtain graphene nano coil powder. The graphene nanoscroll powder includes a plurality of tubular graphene nanoscrolls and a plurality of nano-metal particles. And dissolving the graphene nano roll powder in a solvent, coating the solvent on the graphene layer, and drying and volatilizing the solvent to form the graphene nano roll layer.
Optionally, the method for forming the second graphene metal composite solution includes: dissolving graphene oxide in a solvent, and performing ultrasonic treatment to form a graphene oxide solution. Adding a metal compound into the graphene oxide solution, uniformly mixing, adding hydrazine hydrate, and stirring at 50-70 ℃ for 20-60 min for reduction treatment to form a second graphene metal composite solution. Wherein the mass ratio of the hydrazine hydrate to the graphene oxide is 20/1-5/1.
Optionally, the method for performing reduction treatment on the solid particles includes: and (3) placing the solid particles in a sealed container, keeping the solid particles for 5-20 hours at 50-150 ℃ by adopting hydrazine, and reducing the solid particles.
Optionally, the method for forming the first graphene metal composite solution includes: dissolving graphene oxide in a solvent, and performing ultrasonic treatment to form a graphene oxide solution. Adding a metal compound into the graphene oxide solution, uniformly mixing, adding sodium borohydride with the concentration of 0.01-0.5M, and stirring for reduction treatment. And carrying out a centrifugal washing process on the solution after the reduction treatment to form a first graphene metal composite solution.
Optionally, the embodiment of the present application further provides a method for preparing an electrode, and the electrode prepared by the method can be used for a touch electrode of an OLED display panel. The preparation method of the electrode comprises the following steps: dissolving graphene oxide in a solvent, performing ultrasonic treatment to form a graphene oxide solution, adding 0.01-0.5M sodium borohydride, stirring to perform reduction treatment, and performing a centrifugal washing process on the solution after the reduction treatment to form the graphene solution. And coating the graphene solution on a substrate to form a graphene layer. Dissolving graphene oxide in a solvent, performing ultrasonic treatment to form a graphene oxide solution, adding hydrazine hydrate, and stirring at 50-70 ℃ for 20-60 min for reduction treatment to obtain a reduction solution. The reducing solution was sprayed in a liquid nitrogen bath and freeze-dried to form solid particles. And then, placing the solid particles in a closed container, and keeping the solid particles for 5-20 hours at the temperature of 50-150 ℃ by adopting hydrazine to obtain the graphene nano-roll. And dissolving the graphene nanocolloid in a solvent, and coating the graphene nanocolloid on the graphene layer. And drying and volatilizing the solvent to form the graphene nano coil layer.
A third aspect of the embodiments of the present application provides a method for manufacturing a display panel. The method of manufacturing the display panel includes a method of manufacturing a plurality of light emitting devices. The method of fabricating a light emitting device includes: on the base substrate, the first electrode is formed using the method in the embodiment of the second aspect described above. On the base substrate, a second electrode is formed. The first electrode and the second electrode are stacked. The first electrode has a work function greater than that of the second electrode.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a display device according to an embodiment of the present disclosure;
fig. 2 is a schematic view of a pixel unit of a display panel according to an embodiment of the present disclosure;
fig. 3a is a schematic diagram of a bottom-emitting OLED display panel according to an embodiment of the present disclosure;
FIG. 3b is a schematic diagram of an inverted structure OLED display panel according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a first electrode according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of another first electrode provided in an embodiment of the present application;
FIG. 6 is a schematic view of another first electrode provided in an embodiment of the present application;
fig. 7 is a flow chart of a process for preparing a first electrode according to an embodiment of the present disclosure;
fig. 8 is a flowchart of another first electrode manufacturing process according to an embodiment of the present disclosure.
Reference numerals:
01-a display panel; 02-middle frame; 03-a housing; 101-sub-pixel; 101-R-red subpixel; 101-G-green subpixel; 101-B-blue subpixel; 100-pixel cells; 10-a substrate base plate; 20-an OLED device; 210-a first electrode; 220-hole injection layer; 230-a hole transport layer; 240-organic light emitting layer; 250-an electron transport layer; 260-electron injection layer; 270-a second electrode; 30-an encapsulation layer; 211-a graphene layer; 212-graphene nanoscroll layer; 2120-graphene nanoscrolls; 213-nano metal particles; 2111-first graphene layer; 2112-second graphene layer.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
Further, in the present application, the terms "upper", "lower", and the like may include, but are not limited to, being defined relative to the orientation in which the components in the drawings are schematically disposed, and it is to be understood that these directional terms may be relative concepts that are used for descriptive and clarifying purposes relative to the orientation in which the components in the drawings are disposed, and that will vary accordingly.
In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate. Furthermore, the term "coupled" may be a manner of making electrical connections that communicate signals. "coupled" may be a direct electrical connection or an indirect electrical connection through intervening media.
Some embodiments of the present application provide a display device. The display device includes, for example, a mobile phone, a tablet computer, a television, a desktop computer, a smart wearable product (smart watch, bracelet), a Personal Digital Assistant (PDA), a vehicle-mounted computer, and the like. The embodiment of the present application does not specifically limit the specific form of the display device.
In the present application, as shown in fig. 1, the display device includes a display panel 01, a middle frame 02 for carrying the display panel 01, and a housing 03 located on a side of the middle frame 02 far from the display panel 01. The housing 03 protects various electronic components, such as a camera, a battery, a circuit board (not shown in the figure), and the like, mounted on the side of the center frame 02 close to the housing 03.
The display panel 01 displays an image. In some embodiments of the present application, the display panel 01 may be an organic light-emitting diode (OLED) display panel. The OLED display panel is provided with OLED devices arranged in an array. The OLED device can realize self-luminescence, so that a backlight source is not required to be arranged in the display device with the OLED display panel.
The display panel 01 includes a plurality of sub-pixels 101 as shown in fig. 2 in order to display an image. One light emitting device is disposed in each sub-pixel 101. In some embodiments of the present application, the light emitting device may be an OLED device. The plurality of subpixels 101 includes at least three subpixels 101 for emitting three primary colors, and the at least three subpixels 101 for emitting three primary colors may constitute one pixel unit 100. For example, taking three primary colors of red (R), green (G) and blue (B) as an example, the three sub-pixels 101 may be a red sub-pixel 101-R, a green sub-pixel 101-G and a blue sub-pixel 101-B shown in fig. 2, and the three sub-pixels constitute one pixel unit 100.
In some embodiments, as shown in fig. 3a, the OLED device 20 includes a first electrode 210, a hole injection layer 220, a hole transport layer 230, an organic light emitting layer 240, an electron transport layer 250, an electron injection layer 260, and a second electrode 270 sequentially disposed on a substrate 10. In addition, an encapsulation layer 30 is also disposed on OLED device 20 for protection of OLED device 20.
In some embodiments, the substrate base plate 10 for carrying the light emitting device 20 may be a glass base plate. Alternatively, in other embodiments, in order to realize a flexible display, the substrate 10 may be a flexible substrate, for example, a flexible resin material, which may be Polyimide (PI) as an example.
In addition, each subpixel 101 further comprises a pixel driving circuit (not shown), which is coupled to OLED device 20. The pixel driving circuit applies a voltage to the first electrode 210 and the second electrode 270 of the OLED device 20, the second electrode 270 injects electrons into the electron injection layer 260, the electrons move to the organic light emitting layer 240 through the electron transport layer 250 under the action of the voltage, the first electrode 210 injects holes into the hole injection layer 220, the holes move to the organic light emitting layer 240 through the hole transport layer 230 under the action of the voltage, and the electrons and the holes combine in the organic light emitting layer 240 to emit light, thereby realizing self-luminescence.
In addition, when the types of organic molecular materials in the organic light emitting layer 240 are different, the color of emitted light is also different. In this case, at least three OLED devices emitting light of three primary colors may be disposed in one pixel unit 100 of the display panel 01. In addition, by adjusting the voltages applied to the first electrode 210 and the second electrode 270 of the OLED device at different positions in the display panel, the light emitting intensity of the OLED device can be changed, thereby realizing the display of a color picture.
In some embodiments, the first electrode 210 is a transparent conductive electrode, the second electrode 270 is an opaque metal layer, and light emitted from the organic light emitting layer 240 exits through the substrate 10, so that the OLED display panel is a bottom emission OLED display panel.
In other embodiments, as shown in fig. 3b, the OLED device 20 includes a second electrode 270, an electron injection layer 260, an electron transport layer 250, an organic light emitting layer 240, a hole transport layer 230, a hole injection layer 220, and a first electrode 210 sequentially disposed on the substrate 10. An encapsulation layer 30 for protecting the OLED device is also disposed on the OLED device 20. In this case, light emitted from the organic light emitting layer 240 exits from a side away from the substrate 10, and the display panel 01 is an inverted OLED.
In some embodiments, the second electrode 270 in the OLED display panel is a whole layer structure disposed on the substrate, and one first electrode block is disposed corresponding to the OLED device 20 in each sub-pixel, and when displaying, the same voltage is applied to the second electrode 270, and different voltages are applied to the first electrode blocks of each OLED device 20, so as to implement separate control of light emission of each sub-pixel.
Alternatively, in other embodiments, one second electrode block is provided for each OLED device 20 in each sub-pixel. In performing the display, the same voltage is applied to the first electrodes, and different voltages are applied to the second electrode blocks of each OLED device 20, thereby achieving individual control of light emission of each sub-pixel. In this case, the first electrode 210 may be an entire layer structure disposed on the substrate base plate. Alternatively, the first electrode 210 may be multiplexed as a touch electrode, and the first electrode 210 has a plurality of block-shaped touch electrodes, each touch electrode corresponding to N × N sub-pixels. Wherein N is more than or equal to 2 and is a positive integer. N may be set according to touch accuracy. For example, when the accuracy is high, the N value is small, and when the accuracy is low, the N value is large.
As can be seen from the above, the first electrode 210 provides holes, and thus needs to have a high work function. The second electrode 270 supplies electrons and needs to have a low work function. Wherein the work function of the first electrode 210 is greater than that of the second electrode 270. Based on this, first electrode 210 may be an anode of OLED device 20, and second electrode 270 may be a cathode of OLED device 20.
In some embodiments of the present application, a display panel is provided, as shown in fig. 4, a first electrode 210 including a graphene layer 211 and a graphene nanoscroll layer 212. The graphene nanoscroll layer 212 and the graphene layer 211 are stacked. The graphene nanoscroll layer 212 includes a plurality of graphene nanoscrolls 2120 of a tubular structure.
In addition, in order to increase the work function of the first electrode 210, the first electrode 210 further includes nano metal particles 213, and as shown in fig. 4, the nano metal particles 213 are dispersed in the graphene layer 211 and the graphene nanoscroll layer 212.
In order to enable the first electrode 210 to more efficiently supply holes to the light emitting function layer, in some embodiments of the present application, the work function of the first electrode 210 is greater than 4.7 ev. In this case, the material of the nano-metal particles 213 dispersed in the first electrode 210 is a metal having a high work function. For example, at least one of gold (Au), nickel (Ni), iridium (Ir), and platinum (Pt) may be used.
To sum up, in the display panel provided in the embodiment of the present application, the first electrode of the OLED device is a laminated structure of a graphene layer and a graphene nanoscroll layer. The graphene has high flexibility, high light transmittance and good conductivity. In addition, the graphene nano roll has a unique tubular shape and an open inner cavity, so that the graphene nano roll has good ion transfer capacity and high electrochemical performance. Under high deformation (such as rolling, stretching and folding), some graphene nano-reels can bridge the fragment areas of graphene, so that current transmission can be maintained, and the first electrode still keeps excellent conductivity. In addition, the nano-metal particles dispersed in the first electrode may increase the work function of the first electrode. In addition, the graphene has high refractive index, the metal nanoparticles have a good light scattering effect, and the first electrode has the effect of enhancing the light extraction rate due to the synergistic effect of the graphene and the metal nanoparticles.
In some embodiments of the present application, as shown in fig. 5, the first electrode 210 includes adjacent first and second graphene layers 2111 and 2112. The graphene nanoscroll layer 212 is located between the first graphene layer 2111 and the second graphene layer 2112. In addition, the first electrode 210 provided in the present application may be formed by stacking a plurality of layers in the above-described structure, as shown in fig. 6.
In addition, when the thickness of the first electrode 210 is too thin, the conductivity of the electrode is poor, and during the deformation process, damage to the electrode is easily caused. When the thickness of the first electrode 210 is excessively thick, the light transmittance of the display device is reduced. Therefore, in some embodiments of the present application, the thickness of the first electrode 210 is 30 to 1000 nm. Illustratively, the thickness of the first electrode is 30nm, 50nm, 80nm, 100nm, 150nm, 200nm, 300nm, 400nm, 500nm, 600nm, 700nm, 800nm, 900nm, 1000 nm.
In the present application, the number of stacked graphene layers 211 and graphene nanoscroll layers 212 is not limited as long as the thickness of the first electrode 210 is 30 to 1000 nm.
In some embodiments of the present application, a method for manufacturing an electrode is provided, which can be used to manufacture the first electrode 210. As shown in FIG. 7, the method includes S10-S20.
And S10, coating the first graphene metal composite solution on the substrate to form a graphene layer. Wherein, nanometer metal particles are dispersed in the graphene layer.
The method of forming the first graphene metal composite solution includes steps S101 to S103 as in fig. 8.
S101, first, Graphene Oxide (GO) is dissolved in a solvent, which is deionized water as an example. And carrying out ultrasonic treatment to form a uniform graphene oxide solution.
And S102, adding a metal compound into the graphene oxide solution, uniformly mixing, adding sodium borohydride with the concentration of 0.01-0.5M, stirring, and carrying out reduction treatment.
For example, when the metal compound added to the graphene oxide solution is chloroauric acid, the obtained first graphene metal composite solution is a graphene-gold composite solution.
And S103, finally, carrying out multiple centrifugal washing processes on the solution subjected to reduction treatment to remove redundant reactants and impurities to form a first graphene metal composite solution.
In the above step S10, the first graphene metal composite solution may be applied on the substrate by a spin coating process. The coating process includes step S104 as in fig. 8. And spin-coating the first graphene metal composite solution on the substrate, and drying to obtain the graphene layer. The thickness of the graphene layer is 10-300 nm, and nano metal particles are dispersed in the graphene layer.
And S20, spraying the second graphene metal composite solution into a liquid nitrogen bath, and carrying out freeze drying treatment to form solid particles. And reducing the solid particles to obtain graphene nano coil powder. The graphene nano-roll powder comprises a plurality of graphene nano-rolls with tubular structures and a plurality of nano-metal particles. And dissolving the graphene nano roll powder in a solvent, coating the solvent on the graphene layer, and drying and volatilizing the solvent to form the graphene nano roll layer.
The method for forming the second graphene metal composite solution includes steps S105 to S106 as shown in fig. 8.
S105, first, the graphene oxide is dissolved in a solvent, which is deionized water as an example. And carrying out ultrasonic treatment to form a uniform graphene oxide solution.
S106, adding a metal compound into the graphene oxide solution, uniformly mixing, and adding a reducing agent hydrazine hydrate (N) 2 H 4 ·H 2 O), stirring for 20-60 min at the temperature of 50-70 ℃, and carrying out reduction treatment to form a second graphene metal composite solution.
For example, when the second graphene metal complex solution is a graphene-gold complex solution, the metal compound added to the graphene oxide solution may be chloroauric acid.
In some embodiments of the present application, the reducing agent is hydrazine hydrate 2 H 4 ·H 2 The volume ratio of O is 40-90%. In step S106, N is added as a reducing agent 2 H 4 ·H 2 The mass ratio of the O to the graphene oxide is 20/1-5/1.
After the second graphene metal composite solution is formed, as in step S107 in fig. 8, the second graphene metal composite solution is freeze-dried to form solid particles, and the method of performing the reduction treatment on the solid particles includes step S108 in fig. 8.
S108, placing the solid particles in a sealed container and adopting hydrazine (N) 2 H 4 ) And (3) keeping the temperature of 50-150 ℃ for 5-20 h, and carrying out reduction treatment to obtain graphene nano coil powder, wherein the graphene nano coil powder comprises a plurality of nano metal particles.
Further, in the above step S20, the method of forming the graphene nanoscroll layer on the graphene layer includes step S109 as in fig. 8. The graphene nano-roll layer can be obtained by dissolving graphene nano-roll powder in an ethanol solution, coating the solution on a graphene layer by adopting a spin coating process, and drying and volatilizing ethanol. The thickness of the graphene nano-coil layer is 10-100 nm, and nano-metal particles are dispersed in the graphene nano-coil layer.
And repeating the steps S10-S20 for multiple times according to actual requirements to obtain the first electrode with the multilayer graphene layers and the graphene nano roll layers in laminated distribution, wherein the metal nanoparticles are uniformly distributed in the graphene layers and the graphene nano roll layers.
The first electrode manufactured by the manufacturing method provided by the embodiment of the application has the transmittance of more than 90 percent and the resistivity of less than 10 percent -5 Omega.m, the work function is more than 4.7ev, and the material can be used as an anode in an OLED device instead of ITO.
In some embodiments of the present application, a method for preparing an electrode is also provided, and the electrode prepared by the method can be used for a touch electrode and the like of the above OLED display panel. The preparation method of the electrode comprises S201-S202.
S201, dissolving graphene oxide in a solvent, performing ultrasonic treatment to form a graphene oxide solution, adding 0.01-0.5M sodium borohydride, stirring to perform reduction treatment, and performing a centrifugal washing process on the solution after the reduction treatment to form the graphene solution. The graphene solution is spin coated on a substrate to form a graphene layer.
S202, dissolving graphene oxide in a solvent, performing ultrasonic treatment to form a graphene oxide solution, and adding hydrazine hydrate (N) 2 H 4 ·H 2 O), stirring for 20-60 min at 50-70 ℃, and carrying out reduction treatment to obtain a reduction solution. The reducing solution was sprayed into a liquid nitrogen bath and freeze-dried in a freeze dryer. Then, in a closed container, with hydrazine (N) 2 H 4 ) And keeping the temperature of the solution at 50-150 ℃ for 5-20 hours to obtain the graphene nano-roll. And (3) dissolving the graphene nanocoil in ethanol, and spin-coating on the graphene layer prepared in the step S201.
And repeating the steps S201 to S202 according to actual needs to obtain the multilayer graphene-graphene nano coil laminated structure. The electrode prepared by the preparation method provided by the embodiment of the application has good flexibility, high transmittance and good conductivity, and can be used as a touch electrode of a flexible display device.
Some embodiments of the present application further provide a manufacturing method of the display panel, including S301 to S305.
S301, cleaning the substrate. And (3) putting the substrate base plate into acetone, ethanol and deionized water in sequence, ultrasonically cleaning for 10min, and then putting the substrate base plate into an oven for drying.
S302, a second electrode is prepared, and the second electrode may be a cathode of the OLED display panel. And putting the cleaned substrate into a vacuum chamber, and preparing a second electrode by a vacuum evaporation method.
The second electrode is made of alloy material, the work function of the second electrode is 3-3.6 ev, and the second electrode can be made of MgAg alloy. The thickness of the second electrode is 20 to 200 nm.
S303, preparing a light-emitting functional layer. And forming a light-emitting functional layer on the substrate on which the second electrode is formed. The light-emitting function layer comprises an electron injection layer, an electron transport layer, an organic light-emitting layer, a hole transport layer and a hole injection layer which are sequentially arranged. The method for forming the light emitting functional layer may be vacuum evaporation or wet spin coating, and the method for forming the light emitting functional layer is not particularly limited in the present application.
S304, a first electrode is formed on the light emitting function layer, and the first electrode may be an anode of the OLED panel. The method of forming the first electrode on the light emitting functional layer may adopt the methods of S10 to S20 described above, and will not be described herein again.
S305, preparing an encapsulation layer. First, a first inorganic encapsulation layer is deposited on the first electrode by using a Plasma Enhanced Chemical Vapor Deposition (PECVD) method. The first inorganic packaging layer can be made of SiNx, and the thickness of the first inorganic packaging layer is 100-1000 nm.
Next, an organic encapsulation layer is deposited on the first inorganic encapsulation layer by using an ink-jet printing method. Wherein the thickness of the organic encapsulation layer is 2-10 μm.
And finally, depositing a second inorganic packaging layer on the organic packaging layer again by adopting a PECVD method. The second inorganic packaging layer can also be made of SiNx, and the thickness of the second inorganic packaging layer is 40-800 nm.
The above S301 to S305 are the manufacturing method of the inverted structure OLED display panel provided in the present application.
In some embodiments of the present application, a method of fabricating a bottom-emitting OLED display panel is also provided. The manufacturing method of the bottom-emitting OLED display panel is similar to that of the inverted structure type OLED display panel, except that:
the sequence of forming the layers on the substrate base plate is as follows: the LED chip comprises a first electrode, a light-emitting functional layer, a second electrode and a packaging layer. The sequence of forming the luminous functional layer is as follows: a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer. The materials and the manufacturing method of each layer are the same as those of S301 to S305, and are not described herein again.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A display panel includes a plurality of light emitting devices; the light emitting device includes a first electrode and a second electrode stacked; the work function of the first electrode is larger than that of the second electrode;
the first electrode includes:
a graphene layer; the graphene layers comprise a first graphene layer and a second graphene layer which are adjacent to each other;
the graphene nano roll layer is laminated with the graphene layer; the graphene nano-roll layer comprises a plurality of graphene nano-rolls with tubular structures; the graphene nanoscroll layer is located between the first graphene layer and the second graphene layer;
and nano metal particles dispersed in the graphene layer and the graphene nanoscroll layer.
2. The display panel according to claim 1,
the material of the nano metal particles comprises at least one of gold, nickel, iridium and platinum;
the work function of the first electrode is greater than 4.7 ev.
3. The display panel according to any one of claims 1 to 2, wherein the first electrode has a thickness of 30 to 1000 nm.
4. The display panel according to claim 1, further comprising a substrate base plate for carrying the light-emitting device; the substrate base plate is made of flexible resin material.
5. A method of making an electrode, comprising:
coating a first graphene metal composite solution on a substrate to form a first graphene layer;
spraying the second graphene metal composite solution in a liquid nitrogen bath, and carrying out freeze-drying treatment to form solid particles;
reducing the solid particles to obtain graphene nano coil powder; the graphene nano-roll powder comprises a plurality of graphene nano-rolls with tubular structures and a plurality of nano-metal particles;
dissolving graphene nano roll powder in a solvent, coating the graphene layer with the graphene nano roll powder, and drying and volatilizing the solvent to form a graphene nano roll layer;
coating the first graphene metal composite solution on a substrate to form a second graphene layer; the first graphene layer and the second graphene layer are both dispersed with nano-metal particles.
6. The method of manufacturing an electrode according to claim 5, wherein the method of forming the second graphene metal composite solution includes:
dissolving graphene oxide in a solvent, and performing ultrasonic treatment to form a graphene oxide solution;
adding a metal compound into the graphene oxide solution, uniformly mixing, adding hydrazine hydrate, and stirring at 50-70 ℃ for 20-60 min for reduction treatment to form a second graphene metal composite solution;
the mass ratio of the hydrazine hydrate to the graphene oxide is 20/1-5/1.
7. The method of claim 6, wherein the step of subjecting the solid particles to a reduction treatment comprises:
and (3) placing the solid particles in a sealed container, keeping the solid particles for 5-20 hours at the temperature of 50-150 ℃ by adopting hydrazine, and reducing the solid particles.
8. The method of manufacturing an electrode according to claim 5, wherein the method of forming the first graphene metal composite solution includes:
dissolving graphene oxide in a solvent, and performing ultrasonic treatment to form a graphene oxide solution;
adding a metal compound into the graphene oxide solution, uniformly mixing, adding sodium borohydride with the concentration of 0.01-0.5M, and stirring for reduction treatment;
and carrying out a centrifugal washing process on the solution after the reduction treatment to form the first graphene metal composite solution.
9. A method of fabricating a display panel, the method comprising a method of fabricating a plurality of light emitting devices;
the method for manufacturing the light emitting device comprises the following steps:
forming a first electrode on a substrate by using the method for manufacturing an electrode according to any one of claims 5 to 8;
forming a second electrode on the substrate base plate; the first electrode and the second electrode are arranged in a stacked manner; the first electrode has a work function greater than that of the second electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237258.2A CN110993820B (en) | 2019-12-05 | 2019-12-05 | Display panel and manufacturing method thereof, and manufacturing method of electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237258.2A CN110993820B (en) | 2019-12-05 | 2019-12-05 | Display panel and manufacturing method thereof, and manufacturing method of electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110993820A CN110993820A (en) | 2020-04-10 |
| CN110993820B true CN110993820B (en) | 2022-08-09 |
Family
ID=70090509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911237258.2A Active CN110993820B (en) | 2019-12-05 | 2019-12-05 | Display panel and manufacturing method thereof, and manufacturing method of electrode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110993820B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112086580A (en) * | 2020-09-15 | 2020-12-15 | 武汉华星光电半导体显示技术有限公司 | Display panel and preparation method thereof |
| CN113871210B (en) * | 2021-08-30 | 2023-07-18 | 兰州大学 | Graphene nano-roll-based electrode material and preparation method and application thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020265A (en) * | 2010-12-22 | 2011-04-20 | 中国科学院化学研究所 | Carbon nanometer roll and preparation method thereof |
| WO2014112766A1 (en) * | 2013-01-21 | 2014-07-24 | 덕산하이메탈(주) | Transparent electrode including nano-material layer, method for fabricating same, and optical element device, display device and touch panel device including same |
| CN104445153A (en) * | 2013-09-13 | 2015-03-25 | 中国科学院兰州化学物理研究所 | Method for macroscopic quantity preparation of carbon nano coil from graphene |
| CN107104192A (en) * | 2017-04-14 | 2017-08-29 | 深圳市华星光电技术有限公司 | Quantum dot displays part and its manufacture method |
| KR20170106093A (en) * | 2016-03-11 | 2017-09-20 | 한국전자통신연구원 | Transparent electrode and fabrication method thereof |
| CN107331794A (en) * | 2017-07-27 | 2017-11-07 | 京东方科技集团股份有限公司 | Compliant conductive structure, its preparation method, flexible display panels and display device |
| CN107808928A (en) * | 2017-10-31 | 2018-03-16 | 南京旭羽睿材料科技有限公司 | A kind of organic inorganic hybridization solar cell based on graphene |
| CN108134013A (en) * | 2017-12-15 | 2018-06-08 | 昆山维信诺科技有限公司 | Flexible display panels and display device |
| CN109390490A (en) * | 2017-08-07 | 2019-02-26 | Tcl集团股份有限公司 | A kind of combination electrode material and preparation method thereof and QLED device |
| CN110085763A (en) * | 2019-04-26 | 2019-08-02 | 京东方科技集团股份有限公司 | Flexible transparent electrode, flexible display panels, related manufacturing processes and display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150078509A (en) * | 2013-12-30 | 2015-07-08 | 엘지디스플레이 주식회사 | Flexible electronic device with multi-functional barrier layer |
-
2019
- 2019-12-05 CN CN201911237258.2A patent/CN110993820B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102020265A (en) * | 2010-12-22 | 2011-04-20 | 中国科学院化学研究所 | Carbon nanometer roll and preparation method thereof |
| WO2014112766A1 (en) * | 2013-01-21 | 2014-07-24 | 덕산하이메탈(주) | Transparent electrode including nano-material layer, method for fabricating same, and optical element device, display device and touch panel device including same |
| CN104445153A (en) * | 2013-09-13 | 2015-03-25 | 中国科学院兰州化学物理研究所 | Method for macroscopic quantity preparation of carbon nano coil from graphene |
| KR20170106093A (en) * | 2016-03-11 | 2017-09-20 | 한국전자통신연구원 | Transparent electrode and fabrication method thereof |
| CN107104192A (en) * | 2017-04-14 | 2017-08-29 | 深圳市华星光电技术有限公司 | Quantum dot displays part and its manufacture method |
| CN107331794A (en) * | 2017-07-27 | 2017-11-07 | 京东方科技集团股份有限公司 | Compliant conductive structure, its preparation method, flexible display panels and display device |
| CN109390490A (en) * | 2017-08-07 | 2019-02-26 | Tcl集团股份有限公司 | A kind of combination electrode material and preparation method thereof and QLED device |
| CN107808928A (en) * | 2017-10-31 | 2018-03-16 | 南京旭羽睿材料科技有限公司 | A kind of organic inorganic hybridization solar cell based on graphene |
| CN108134013A (en) * | 2017-12-15 | 2018-06-08 | 昆山维信诺科技有限公司 | Flexible display panels and display device |
| CN110085763A (en) * | 2019-04-26 | 2019-08-02 | 京东方科技集团股份有限公司 | Flexible transparent electrode, flexible display panels, related manufacturing processes and display device |
Non-Patent Citations (1)
| Title |
|---|
| Hybrid film of single-layer graphene and carbon nanotube as transparent conductive electrode for organic light emitting diode;Pradeep Kumar;《Synthetic Metals》;20191007;116186，第1-8页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110993820A (en) | 2020-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108539043B (en) | O L ED display panel, manufacturing method thereof and display device | |
| US20230033003A1 (en) | Electroluminescent diode array substrate, manufacturing method thereof and display panel | |
| CN105097868B (en) | Organic luminescent device | |
| CN106129263B (en) | OLED display device and preparation method thereof | |
| CN108172605B (en) | Organic light emitting diode substrate, preparation method thereof and display panel | |
| WO2011162080A1 (en) | Organic electroluminescence element | |
| CN109524437B (en) | OLED structure, preparation method thereof, display panel and electronic equipment | |
| CN109713009B (en) | Electroluminescent device and manufacturing method thereof | |
| KR102522012B1 (en) | Conductive element and electronic devices comprising the same | |
| US8698177B2 (en) | Organic light-emitting display device and method of manufacturing the same | |
| KR101654360B1 (en) | Substrate for oled and method for fabricating thereof | |
| CN207068930U (en) | Oled display substrate and OLED display | |
| CN110993820B (en) | Display panel and manufacturing method thereof, and manufacturing method of electrode | |
| CN105742311B (en) | A kind of display device and preparation method thereof | |
| CN107644894B (en) | Organic electroluminescent device, preparation method thereof and display device | |
| CN106784389A (en) | A kind of composite transparent electrode, Organic Light Emitting Diode and preparation method thereof | |
| CN113257854B (en) | Display panel, preparation method thereof and display device | |
| US20190363144A9 (en) | Array substrate including a resistance reducing component, method for fabricating the array substrate, and display device | |
| JP2017092213A (en) | Organic electroluminescent element, display device and method of manufacturing organic electroluminescent element | |
| CN110634933A (en) | OLED display panel, display device and preparation method | |
| CN111129089B (en) | Display panel and preparation method thereof | |
| CN104993066A (en) | OLED device, preparation method thereof and display device | |
| US20200043995A1 (en) | Top-emission type oled display panel and manufacturing method thereof | |
| KR20140057852A (en) | Organic light emitting device and manufacturing method thereof | |
| KR100805270B1 (en) | Flexible organic light emitting diode using transparent organic based electrode and method for manufacturing this |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |