CN110048031B - OLED panel light-emitting layer processing method, OLED panel preparation method and OLED panel - Google Patents
OLED panel light-emitting layer processing method, OLED panel preparation method and OLED panel Download PDFInfo
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- CN110048031B CN110048031B CN201910303065.6A CN201910303065A CN110048031B CN 110048031 B CN110048031 B CN 110048031B CN 201910303065 A CN201910303065 A CN 201910303065A CN 110048031 B CN110048031 B CN 110048031B
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- H10K50/00—Organic light-emitting devices
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- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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Abstract
The embodiment of the invention discloses a method for processing a light emitting layer of an OLED panel, a method for preparing the OLED panel and the OLED panel. The method for processing the light emitting layer of the OLED panel comprises the following steps: and printing and preparing a hole injection layer, a hole transport layer and a light-emitting layer on the driving substrate, and then flushing the surface of the light-emitting layer of the driving substrate by using a poor solvent of the light-emitting layer material. According to the embodiment of the invention, after the surface of the light-emitting layer of the OLED panel is washed by the poor solvent, the interface characteristic of the light-emitting layer and the electron transport layer at the later stage is improved, the content of doped light-emitting molecules at the interface is reduced, excitons are favorably compounded in the light-emitting layer, and the probability of exciton recombination quenching at the interface is reduced.
Description
Technical Field
The invention relates to the technical field of semiconductor materials, in particular to a method for processing a light emitting layer of an OLED panel, a method for preparing the OLED panel and the OLED panel.
Background
Organic Light-Emitting diodes (OLEDs) have been widely used in flat panel display devices due to their advantages of high contrast, large viewing angle, fast response speed, Light weight, flexibility, etc. At present, the small-size OLED product adopts vacuum evaporation and fine mask technology to realize RGB (Red, Green and Blue) three-color display, and tends to be mature. However, the large-size OLED product has low yield and is discarded due to the fact that the mask plate is seriously warped and deformed after the size of the mask plate is increased, and the alignment difficulty is increased. Large-size color displays are currently generally realized by white light and color filter technologies. However, the vacuum evaporation white light adopts a multilayer structure, and has the defects of complex equipment and process, high energy consumption, large material waste, high cost and the like. After the organic functional material is prepared into ink by the OLED printing technology, the material is utilized to the maximum extent by solution processing technologies such as silk-screen printing or ink-jet printing, and the like, a fine metal mask plate is not needed, the cost can be effectively reduced, and the method has great advantages in the aspect of preparing large-size OLED panels.
At present, the structure of an OLED device is generally a multi-organic-layer structure, a hole injection layer, a hole transmission layer and an organic light-emitting layer are printed and prepared on an electrode layer by layer, because an organic material is in a solution coating mode, the organic layers have the problem of mutual solubility, factors such as cross-linking material design and orthogonal solvent need to be considered in the aspect of materials, and the appearance optimization of the organic layers is another important difficulty in the preparation of the current printed OLED. The thin film with uniform thickness is a key factor influencing the performance and light color of the OLED device. Factors affecting the film thickness uniformity are complex, such as substrate wettability, ink viscosity, surface tension, solvent volatility, solute deposition and drying process, etc. To date, there is no uniform and definite theoretical method for optimizing the morphology of the thin film. In the film forming process of the printing OLED panel, the steps of printing, drying and baking are generally divided, and the hole injection layer, the hole transport layer and the light emitting layer are sequentially repeated, and then transferred into a vacuum chamber to be evaporated with the electron transport layer and the cathode. However, the light-emitting layer is processed by solution, and the interface between the light-emitting layer and the evaporated electron transport layer has a problem of quenching excitons due to exciton recombination at the interface due to uneven interface film thickness.
Disclosure of Invention
The embodiment of the invention provides a processing method of an OLED panel light-emitting layer, an OLED panel preparation method and an OLED panel, which improve the interface characteristic of the light-emitting layer and an electron transport layer at the later stage, reduce the content of doped light-emitting molecules at the interface, facilitate the recombination of excitons in the light-emitting layer, reduce the probability of exciton recombination quenching at the interface, and improve the light-emitting efficiency and the service life of an OLED device.
In order to solve the above problem, in a first aspect, the present application provides a method for processing a light emitting layer of an OLED panel, where the method for processing the light emitting layer of the OLED panel includes: and printing and preparing a hole injection layer, a hole transport layer and a light-emitting layer on the driving substrate, and then flushing the surface of the light-emitting layer of the driving substrate by using a poor solvent of the light-emitting layer material.
Further, the method further comprises:
after the surface of the light-emitting layer of the driving substrate is washed by a poor solvent of the light-emitting layer material, the driving substrate is transferred to annealing equipment for annealing treatment.
Further, the step of flushing the surface of the light-emitting layer of the driving substrate with a poor solvent for the material of the light-emitting layer includes:
rotating the driving substrate at a rotation speed of 500-5000 r/s;
using N in a nitrogen atmosphere2Cleaning the surface of a light emitting layer of the driving substrate for 10-30 s;
and then adopting a poor solvent of the luminescent layer material to wash the surface of the luminescent layer of the driving substrate for 20-150 seconds.
Further, the annealing time of the annealing treatment is 5-30 min.
Further, the poor solvent of the luminescent layer material is alcohol, ether or ketone.
Further, when the poor solvent of the luminescent layer material is alcohol, the poor solvent of the luminescent layer material is methanol, ethanol, isopropanol, n-hexanol, ethylene glycol or propylene glycol;
when the poor solvent of the luminescent layer material is ether, the poor solvent of the luminescent layer material is methyl ether, ethyl ether, anisole or diethylene glycol monobutyl ether;
when the poor solvent of the luminescent layer material is ketone, the poor solvent of the luminescent layer material is acetone, butanone, cyclohexanone or acetophenone.
In a second aspect, the present application provides a method for preparing an OLED panel, including:
sequentially printing and preparing a hole injection layer, a hole transport layer and a light-emitting layer on the driving substrate;
after a hole injection layer, a hole transport layer and a light-emitting layer are printed and prepared on a driving substrate, a poor solvent of a light-emitting layer material is adopted to wash the surface of the light-emitting layer of the driving substrate;
after the surface of the light-emitting layer of the driving substrate is washed by adopting a poor solvent of a light-emitting layer material, transferring the driving substrate into annealing equipment for annealing treatment;
and transferring the driving substrate to a vacuum chamber for evaporating an electron transport layer and a cathode.
Furthermore, each printing operation for preparing the hole injection layer, the hole transport layer and the luminescent layer by printing comprises three steps of printing treatment, drying treatment and annealing treatmentA step of printing in air or N2The method is carried out under the environment.
Further, the drying treatment mode is vacuum pumping drying, and the vacuum pressure range is 0.00001-500 mbar during vacuum pumping drying.
In a third aspect, the present application provides an OLED panel prepared by the method of any one of the second aspects.
The method for processing the light emitting layer of the OLED panel comprises the following steps: and printing and preparing a hole injection layer, a hole transport layer and a light-emitting layer on the driving substrate, and then flushing the surface of the light-emitting layer of the driving substrate by using a poor solvent of the light-emitting layer material. According to the embodiment of the invention, after the surface of the light-emitting layer of the OLED panel is washed by the poor solvent, the interface characteristic of the light-emitting layer and the electron transport layer at the later stage is improved, the content of doped light-emitting molecules at the interface is reduced, excitons are favorably compounded in the light-emitting layer, the probability of quenching the excitons in the interface is reduced, and the light-emitting efficiency and the service life of an OLED device are improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of an embodiment of a method for manufacturing an OLED panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the invention provides a method for processing a light emitting layer of an OLED panel, a method for preparing the OLED panel and the OLED panel, which are respectively described in detail below.
First, an embodiment of the present invention provides a method for processing a light emitting layer of an OLED panel, where the method for processing the light emitting layer of the OLED panel includes: and printing and preparing a hole injection layer, a hole transport layer and a light-emitting layer on the driving substrate, and then flushing the surface of the light-emitting layer of the driving substrate by using a poor solvent of the light-emitting layer material.
The method for processing the light-emitting layer of the OLED panel in the embodiment of the invention can be a step in the preparation method of the OLED panel, and the method comprises the steps of printing and preparing the hole injection layer, the hole transport layer and the light-emitting layer on the driving substrate, and then flushing the surface of the light-emitting layer of the driving substrate by adopting a poor solvent of the material of the light-emitting layer. After the surface of the light-emitting layer of the OLED panel is washed by a poor solvent, the interface characteristic of the light-emitting layer and the electron transmission layer at the later stage is improved, the content of doped light-emitting molecules at the interface is reduced, excitons are favorably compounded in the light-emitting layer, the probability of quenching the excitons in the interface is reduced, and the light-emitting efficiency and the service life of an OLED device are improved.
In some embodiments of the present invention, the method for processing the light emitting layer of the OLED panel further includes: after the surface of the light-emitting layer of the driving substrate is washed by using a poor solvent of a light-emitting layer material, the driving substrate is transferred to annealing equipment for annealing treatment, specifically, the annealing treatment refers to a process of placing the dried driving substrate on an oven or a hot table, heating at a preset temperature to remove residual solvent and performing thermal crosslinking. The annealing time of the annealing treatment is 5-30 min. In addition, the annealing treatment temperature is equal to or lower than the light emitting layer annealing temperature (i.e., annealing temperature at the time of driving the substrate to print the light emitting layer).
Further, the step of washing the surface of the light-emitting layer of the driving substrate with the poor solvent of the light-emitting layer material may include: rotating the driving substrate at a rotation speed of 500-5000 r/s; using N in a nitrogen atmosphere2Cleaning the surface of a light emitting layer of the driving substrate for 10-30 s; and then, flushing the surface of the light emitting layer of the driving substrate by using the poor solvent of the light emitting layer material for 20-150 seconds, preferably, flushing the surface of the light emitting layer of the driving substrate by using the poor solvent of the light emitting layer material for 30-180 seconds.
The poor solvent of the luminescent layer material can be alcohols, ethers or ketones. In specific implementation, when the poor solvent of the light-emitting layer material is an alcohol, the poor solvent of the light-emitting layer material may be methanol, ethanol, isopropanol, n-hexanol, ethylene glycol or propylene glycol, etc.; when the poor solvent of the luminescent layer material is ether, the poor solvent of the luminescent layer material can be methyl ether, ethyl ether, anisole or diethylene glycol monobutyl ether and the like; when the poor solvent of the luminescent layer material is ketone, the poor solvent of the luminescent layer material can be acetone, butanone, cyclohexanone or acetophenone.
An example of a method of fabricating an OLED panel according to an embodiment of the present invention will be described below.
As shown in fig. 1, which is a schematic flow chart of an embodiment of a method for manufacturing an OLED panel according to an embodiment of the present invention, the method includes:
101. and printing and preparing a hole injection layer, a hole transport layer and a light-emitting layer on the driving substrate in sequence.
Wherein, each printing operation of printing and preparing the hole injection layer, the hole transport layer and the luminescent layer can comprise three steps of printing treatment, drying treatment and annealing treatment, the printing treatment mode is ink-jet printing, and the printing treatment can be carried out in air or N2The method is carried out under the environment. In addition, the drying treatment mode is vacuum pumping drying, and the vacuum pressure range is 0.00001-500 mbar during vacuum pumping drying. Specifically, the hole injection layer is annealed in the air, and the hole transport layer and the light-emitting layer are in N2And carrying out annealing treatment under the environment.
102. After a hole injection layer, a hole transport layer and a light-emitting layer are printed and prepared on the driving substrate, a poor solvent of a light-emitting layer material is adopted to wash the surface of the light-emitting layer of the driving substrate.
Further, the step of washing the surface of the light-emitting layer of the driving substrate with the poor solvent of the light-emitting layer material may include: rotating the driving substrate at a rotation speed of 500-5000 r/s; using N in a nitrogen atmosphere2Cleaning the surface of a light emitting layer of the driving substrate for 10-30 s; using luminescent materialThe poor solvent washes the surface of the light-emitting layer of the driving substrate for 20-150 s, preferably, the washing time of the poor solvent of the light-emitting layer material washing the surface of the light-emitting layer of the driving substrate is 30-180 s.
The poor solvent of the luminescent layer material can be alcohols, ethers or ketones. In specific implementation, when the poor solvent of the light-emitting layer material is an alcohol, the poor solvent of the light-emitting layer material may be methanol, ethanol, isopropanol, n-hexanol, ethylene glycol or propylene glycol, etc.; when the poor solvent of the luminescent layer material is ether, the poor solvent of the luminescent layer material can be methyl ether, ethyl ether, anisole or diethylene glycol monobutyl ether and the like; when the poor solvent of the luminescent layer material is ketone, the poor solvent of the luminescent layer material can be acetone, butanone, cyclohexanone or acetophenone.
103. After the surface of the light-emitting layer of the driving substrate is washed by a poor solvent of the light-emitting layer material, the driving substrate is transferred to annealing equipment for annealing treatment.
Specifically, the annealing process refers to a process of placing the dried driving substrate in an oven or a hot stage, heating at a preset temperature to remove residual solvent, and performing thermal crosslinking. The annealing time of the annealing treatment is 5-30 min. In addition, the annealing treatment temperature is equal to or lower than the light emitting layer annealing temperature (i.e., annealing temperature at the time of driving the substrate to print the light emitting layer).
104. And transferring the driving substrate to a vacuum chamber for evaporating an electron transport layer and a cathode.
In the embodiment of the invention, in the process of preparing the OLED panel, after the surface of the light-emitting layer of the OLED panel is washed by the poor solvent, the interface characteristic of the light-emitting layer and the electron transmission layer at the later stage is improved, the content of doped light-emitting molecules at the interface is reduced, the exciton is favorably compounded in the light-emitting layer, the probability of exciton recombination quenching at the interface is reduced, and the light-emitting efficiency and the service life of an OLED device are improved.
It should be noted that, in the above OLED panel manufacturing method, only the above steps are described, and it is understood that, in addition to the above step flow, any other necessary steps or flows may be included in the OLED panel manufacturing method according to the embodiment of the present invention as needed, and the details are not limited herein.
In order to better implement the method for preparing the OLED panel in the embodiments of the present invention, on the basis of the method for preparing the OLED panel, the embodiment of the present invention further provides an OLED panel prepared by using the method for preparing the OLED panel described in any one of the embodiments.
By adopting the preparation method of the OLED panel described in the above embodiment, the luminous efficiency and the service life of the OLED panel are further improved.
In order to better implement the OLED panel in the embodiments of the present invention, on the basis of the OLED panel, the embodiments of the present invention further provide a display device, which includes the OLED panel described in any of the embodiments above.
By adopting the preparation method of the OLED panel described in the above embodiments, the luminous efficiency and the lifetime of the display device are further improved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
The method for processing the light emitting layer of the OLED panel, the method for manufacturing the OLED panel, and the OLED panel provided in the embodiments of the present invention are described in detail above, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. The method for processing the light emitting layer of the OLED panel is characterized by comprising the following steps of: after a hole injection layer, a hole transport layer and a luminescent layer are printed and prepared on a driving substrate, the surface of the luminescent layer of the driving substrate is washed by a poor solvent of luminescent layer materials to reduce the content of doped luminescent molecules on the surface of the luminescent layer,
wherein the step of flushing the surface of the light-emitting layer of the driving substrate with the poor solvent of the light-emitting layer material comprises:
rotating the driving substrate at a rotation speed of 500-5000 r/s;
using N in a nitrogen atmosphere2Cleaning the surface of the light emitting layer of the driving substrate for 10-30 s; and
and then adopting a poor solvent of the luminescent layer material to wash the surface of the luminescent layer of the driving substrate for 20-150 s.
2. The method of claim 1, further comprising:
after the surface of the light-emitting layer of the driving substrate is washed by a poor solvent of the light-emitting layer material, the driving substrate is transferred to annealing equipment for annealing treatment.
3. The method for processing the light emitting layer of the OLED panel according to claim 2, wherein the annealing time of the annealing process is 5-30 min.
4. The method according to claim 1, wherein the poor solvent of the material of the light-emitting layer is alcohol, ether or ketone.
5. The method for processing the OLED panel light-emitting layer according to claim 4, wherein when the poor solvent of the light-emitting layer material is an alcohol, the poor solvent of the light-emitting layer material is methanol, ethanol, isopropanol, n-hexanol, ethylene glycol or propylene glycol;
when the poor solvent of the luminescent layer material is ether, the poor solvent of the luminescent layer material is methyl ether, ethyl ether, anisole or diethylene glycol monobutyl ether;
when the poor solvent of the luminescent layer material is ketone, the poor solvent of the luminescent layer material is acetone, butanone, cyclohexanone or acetophenone.
6. The preparation method of the OLED panel is characterized by comprising the following steps:
sequentially printing and preparing a hole injection layer, a hole transport layer and a light-emitting layer on the driving substrate;
after a hole injection layer, a hole transport layer and a light-emitting layer are printed and prepared on a driving substrate, a poor solvent of a light-emitting layer material is adopted to wash the surface of the light-emitting layer of the driving substrate so as to reduce the content of doped light-emitting molecules on the surface of the light-emitting layer;
after the surface of the light-emitting layer of the driving substrate is washed by adopting a poor solvent of a light-emitting layer material, transferring the driving substrate into annealing equipment for annealing treatment;
transferring the driving substrate to a vacuum chamber for evaporating an electron transport layer and a cathode,
wherein the step of flushing the surface of the light-emitting layer of the driving substrate with the poor solvent of the light-emitting layer material comprises:
rotating the driving substrate at a rotation speed of 500-5000 r/s;
using N in a nitrogen atmosphere2Cleaning the surface of the light emitting layer of the driving substrate for 10-30 s; and
and then adopting a poor solvent of the luminescent layer material to wash the surface of the luminescent layer of the driving substrate for 20-150 s.
7. The method for preparing the OLED panel according to claim 6, wherein each printing operation for preparing the hole injection layer, the hole transport layer and the light emitting layer by printing comprises three steps of printing treatment, drying treatment and annealing treatment, the printing treatment is carried out by ink-jet printing, and the printing treatment is carried out in air or N2The method is carried out under the environment.
8. The method for manufacturing the OLED panel according to claim 7, wherein the drying process is vacuum pumping drying, and the vacuum pressure range during the vacuum pumping drying is 0.00001-500 mbar.
9. An OLED panel prepared by the method of any one of claims 6 to 8.
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| CN201910303065.6A CN110048031B (en) | 2019-04-16 | 2019-04-16 | OLED panel light-emitting layer processing method, OLED panel preparation method and OLED panel |
| PCT/CN2019/104424 WO2020211261A1 (en) | 2019-04-16 | 2019-09-04 | Oled panel light-emitting layer processing method, oled panel manufacturing method, and oled panel |
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| CN201910303065.6A CN110048031B (en) | 2019-04-16 | 2019-04-16 | OLED panel light-emitting layer processing method, OLED panel preparation method and OLED panel |
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| CN111129361B (en) * | 2019-12-26 | 2021-04-27 | 深圳市华星光电半导体显示技术有限公司 | Display panel manufacturing method and display panel |
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| CN105070849B (en) * | 2015-07-14 | 2018-09-18 | Tcl集团股份有限公司 | A kind of light emitting diode with quantum dots and preparation method thereof |
| CN110048031B (en) * | 2019-04-16 | 2021-01-01 | 深圳市华星光电半导体显示技术有限公司 | OLED panel light-emitting layer processing method, OLED panel preparation method and OLED panel |
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| Title |
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| "Ether solvent treatment to improve the device performance of the organic light emitting diodes with aluminum cathode";Qiaoqiao Song等;《Organic Electronics》;20150603 * |
| "High efficiency solution processed fluorescent yellow organic light-emitting diode through fluorinated alcohol treatment at the emissive layer/cathode interface";Calvin Yi Bin Ng等;《Journal of Physics D: Applied Physics》;20131205;第47卷(第1期);第2段左栏第1段-第5页右栏第1段 * |
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