Composite film, photoelectric device, preparation method of photoelectric device and display device

Abstract

The invention belongs to the technical field of display, and relates to a composite film, which comprises a first functional layer, a second functional layer and a third functional layer, the second functional layer is arranged on the surface of the first functional layer, and the material of the second functional layer comprises first polyhydric alcohol and a second inorganic nano material. The invention also relates to a composite film and a preparation method thereof, a photoelectric device and a preparation method thereof, and a display device. The composite film provided by the invention can provide a good water-oxygen environment and increase injection of carriers.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and more particularly, to a composite film and a method for preparing the same, an optoelectronic device and a method for preparing the same, and a display device. Background Art

[0002] Display technologies have undergone qualitative leaps from the early cathode ray tubes (CRTs) to liquid crystal displays (LCDs) and plasma panel displays (PDPs) in the mid-1980s, and then to the currently mainstream organic light-emitting diodes (OLEDs) / quantum dot light-emitting diodes (QLEDs).

[0003] QLEDs have the advantages of saturated emission light color, adjustable wavelength, and high photoluminescence and electroluminescence quantum yields, and have become strong competitors to OLEDs in recent years. In QLED devices, functional layers formed of inorganic nanomaterials are often used. However, the carrier transport efficiency of inorganic nanomaterials still needs to be further improved. Summary of the Invention

[0004] Based on this, embodiments of the present application provide a composite film and a method for preparing the same, an optoelectronic device and a method for preparing the same, and a display device.

[0005] Embodiments of the present application also provide a composite film, adopting the following technical solution:

[0006] A first functional layer, the material of the first functional layer including a first inorganic nanomaterial; and

[0007] A second functional layer disposed on the surface of the first functional layer, the material of the second functional layer including a first polyol and a second inorganic nanomaterial.

[0008] Embodiments of the present application also provide a method for preparing a composite film, adopting the following technical solution:

[0009] A method for preparing a composite film, comprising the following steps:

[0010] Providing a first functional solution containing a first inorganic nanomaterial, depositing the first functional solution to form a first functional layer;

[0011] Providing a second functional solution containing a first polyol and a second inorganic nanomaterial, disposing the second functional solution on the first functional layer to form a second functional layer, and obtaining the composite film.

[0012] Embodiments of the present application also provide an optoelectronic device, adopting the following technical solution:

[0013] An optoelectronic device,

[0014] It includes a stacked anode layer, a first carrier functional layer, and a cathode layer;

[0015] Among them, the first carrier functional layer includes a first functional layer and a second functional layer disposed on the first functional layer. The first functional layer includes a first inorganic nanomaterial, the second functional layer includes a first polyol and a second inorganic nanomaterial. The first functional layer is close to the anode layer, and the second functional layer is close to the cathode layer.

[0016] The embodiment of the present application also provides a preparation method of an optoelectronic device, adopting the following technical solution:

[0017] A preparation method of an optoelectronic device for preparing the optoelectronic device as described above, including the following steps:

[0018] Provide an anode layer,

[0019] Form a first carrier functional layer on the light-emitting layer by the preparation method of the composite film as described above;

[0020] Form a cathode layer on the first carrier functional layer to obtain the optoelectronic device.

[0021] The embodiment of the present application also provides a display device, adopting the following technical solution:

[0022] A display device, the display device includes the optoelectronic device as described above.

[0023] Compared with the prior art, the embodiment of the present application mainly has the following beneficial effects:

[0024] In the composite film provided by the present application, by incorporating a polyol material into the inorganic nanomaterial, water and oxygen in the environment are absorbed and stored in the second functional layer, and the water and oxygen are used to improve the surface defects of the inorganic nanomaterial, thereby improving the carrier transport efficiency of the composite film. Description of the Drawings

[0025] In order to more clearly illustrate the solution of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the composite film of the embodiment of the present application;

[0027] Figure 2 It is a schematic structural diagram of the optoelectronic device of the embodiment of the present application;

[0028] Figure 3It is a flowchart of a method for preparing a composite film according to an embodiment of the present application;

[0029] Figure 4 It is a flowchart of a method for preparing an optoelectronic device according to an embodiment of the present application;

[0030] Figure 5 It is a current density-voltage (J-V) characteristic curve graph of the composite film according to an embodiment of the present application and a conventional composite film.

[0031] Reference numerals:

[0032] 1. Anode layer; 2. Second carrier functional layer; 3. Light-emitting layer; 4. First carrier functional layer; 41. First functional layer; 42. Second functional layer; 43. Third functional layer; 5. Cathode layer; 6. Light extraction layer; 7. Fourth functional layer. Detailed implementation manners

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0034] Referring to "embodiment" herein means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0035] Quantum dot light-emitting diodes (QLEDs) have the advantages of saturated emission light color and adjustable wavelength, and high photoluminescence and electroluminescence quantum yields. In recent years, they have become strong competitors of organic light-emitting diodes (OLEDs).

[0036] In the field of QLED devices, due to the wide bandgap characteristic of blue quantum dots, conventional blue QLEDs have difficulties in electron injection, resulting in low luminescence efficiency due to too few electrons injected into the quantum dot light-emitting layer, and further resulting in low device performance of blue QLED devices.

[0037] In a water-oxygen environment, water molecules play a dominant role in the material of the electron transport layer. During the annealing process, water molecules react with the material of the electron transport layer to generate free electrons, thereby improving the electron injection efficiency.

[0038] Please refer to Figure 1 As shown, based on the above-mentioned prior art, the present application provides a composite film, including: a first functional layer 41 and a second functional layer 42 arranged in a stacked manner.

[0039] The material of the first functional layer 41 includes a first inorganic nanomaterial, and the material of the second functional layer 42 includes a first polyol and a second inorganic nanomaterial.

[0040] The second functional layer 42 in the composite film provided by the present application includes a second inorganic nanomaterial and a first polyol. By utilizing the characteristic that the more hydroxyl groups in the polyol, the stronger its hygroscopicity, the water and oxygen in the environment are absorbed and stored in the second functional layer 42, and the surface defects of the inorganic nanomaterial are improved by the water and oxygen, thereby improving the carrier transport efficiency of the composite film.

[0041] It can be understood that the composite film absorbs water and oxygen in the environment, which can be water-oxygen treatment during its preparation process to make it absorb water and oxygen, or it can absorb water and oxygen in the use environment during the use of the composite film, thereby improving the electron injection efficiency of the composite film.

[0042] In some embodiments, the mass ratio of the first polyol in the second functional layer 42 is 1wt% - 30wt%. In this embodiment, the mass ratio of the first polyol in the second functional layer 42 can be set to any value among 1wt%, 5wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt% or the range formed between any two values.

[0043] In some embodiments, the water content in the second functional layer after water-oxygen treatment is 100ppm - 1000ppm. In this embodiment, the water content in the second functional layer can be any value among 100ppm, 150ppm, 200ppm, 500ppm, 1000ppm or the range formed between any two values.

[0044] In some embodiments, the oxygen content in the second functional layer after water-oxygen treatment is 10ppm - 100ppm. In this embodiment, the water content in the second functional layer can be any value among 10ppm, 20ppm, 30ppm, 40ppm, 50ppm, 60ppm, 70ppm, 80ppm, 90ppm, 100ppm or the range formed between any two values.

[0045] In the embodiments of the present application, a polyol with a certain mass ratio is added to the second functional layer 42 to weaken the insulation of the polyol and enable the polyol to absorb sufficient water and oxygen and bring them into the inorganic nanomaterial, providing a good water and oxygen environment for the inorganic nanomaterial to improve the surface defects of the inorganic nanomaterial, thereby facilitating the precipitation of electrons and increasing the number of electron injections.

[0046] In some embodiments, the composite film further includes a third functional layer 43, and the material of the third functional layer 43 includes a second polyol.

[0047] The third functional layer is disposed on the surface of the second functional layer away from the first functional layer.

[0048] In some embodiments, the water content in the third functional layer after water and oxygen treatment is 200 ppm to 1000 ppm. In this embodiment, the water content in the third functional layer can be any value among 200 ppm, 300 ppm, 400 ppm, 500 ppm, 600 ppm, 700 ppm, 800 ppm, 900 ppm, 1000 ppm or a range formed between any two values.

[0049] In some embodiments, the oxygen content in the third functional layer after water and oxygen treatment is 20 ppm to 200 ppm. In this embodiment, the water content in the third functional layer can be any value among 20 ppm, 30 ppm, 40 ppm, 50 ppm, 60 ppm, 70 ppm, 80 ppm, 90 ppm, 100 ppm, 150 ppm, 200 ppm or a range formed between any two values.

[0050] In the embodiments of the present application, by disposing the third functional layer 43 on the second functional layer 42, the third functional layer 43 can absorb water and oxygen, thereby further increasing the water and oxygen concentration in the composite film to further increase the number of electron injections; at the same time, the second functional layer 42 blocks the first functional layer 41 and the third functional layer 43 to prevent the polyol from penetrating downward to the first functional layer 41 or the functional layer below the first functional layer 41, thereby ensuring that the composite film has good electron injection ability.

[0051] In some embodiments, the first inorganic nanomaterial and the second inorganic nanomaterial are each independently selected from one or more of doped or undoped zinc oxide, barium oxide, aluminum oxide, nickel oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanate oxide, aluminum zinc oxide, manganese zinc oxide, tin zinc oxide, lithium zinc oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc stannide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, and barium titanate. The doping elements include one or more of aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, and gadolinium.

[0052] In some embodiments, the polyol contains two or more hydroxyl groups. The first polyol and the second polyol are each independently selected from one or more of ethylene glycol, propylene glycol, dipropylene glycol, glycerol, diglycerol, triglycerol, butanediol, 1,2 - hexanediol, and 1,2 - pentanediol. In this embodiment, glycerol is preferably used. By incorporating polyol into the inorganic nanomaterial in the present application, and utilizing the characteristic that the more hydroxyl groups in the polyol, the stronger the hygroscopicity, the water - oxygen absorption capacity of the second functional layer 42 is improved, so as to increase the water - oxygen concentration in the composite film, thereby achieving the effect of increasing the number of electron injections.

[0053] In some embodiments, the thickness ratio of the first functional layer 41, the second functional layer 42, and the third functional layer 43 is (8 - 20):(2 - 5):1.

[0054] In some embodiments, the thickness range of the first functional layer 41 is 20 - 40 nm, for example, any value among 20 nm, 25 nm, 30 nm, 35 nm, 40 nm or the range formed between any two of these values.

[0055] In some embodiments, the thickness range of the second functional layer 42 is 5 - 10 nm, for example, any value among 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm or the range formed between any two of these values.

[0056] In some embodiments, the thickness range of the third functional layer 43 is 1 - 5 nm, for example, any value among 1 nm, 2 nm, 3 nm, 4 nm, 5 nm or the range formed between any two of these values.

[0057] In this embodiment, the thickness of the first thin film 41 is 30 nm, the thickness of the second thin film is 10 nm, and the thickness of the first water - storage thin film is 2 nm.

[0058] In some embodiments, the mass ratio of the first inorganic nanomaterial of the first functional layer to the second inorganic nanomaterial of the second functional layer is (4 - 10):1.

[0059] Please refer toFigure 3 As shown in the figure, based on the above composite film, an embodiment of the present application further provides a method for preparing a composite film for preparing the above composite film, including the following steps:

[0060] Step S101: Provide a first functional solution containing a first inorganic nanomaterial, deposit the first functional solution, and form a first functional layer.

[0061] Step S102: Provide a second functional solution containing a first polyol and a second inorganic nanomaterial, set the second functional solution on the first functional layer, and form a second functional layer to obtain the composite film.

[0062] The method for preparing the composite film provided by the present application forms a second functional layer on the first functional layer through the second functional solution containing the first polyol and the second inorganic nanomaterial, maintains the electron transport ability of the first functional layer, and absorbs and stores water and oxygen in the environment through the second functional layer, thereby creating a good water and oxygen environment inside the composite film, which improves the electron injection ability of the composite film; in addition, the second functional layer also blocks the polyol to prevent the polyol from penetrating downward and affecting the first functional layer and the functional layers below the first functional layer.

[0063] In some embodiments, after the step of setting the second functional solution on the first functional layer to form a second functional layer, the following steps are further included:

[0064] Perform a first water and oxygen treatment on the second functional layer.

[0065] In this embodiment, the step of performing a first water and oxygen treatment on the second functional layer includes:

[0066] Place the second functional layer in a first water and oxygen atmosphere for the first water and oxygen treatment.

[0067] Among them, the humidity in the first water and oxygen atmosphere is 55% - 90%. In this embodiment, the humidity in the first water and oxygen atmosphere can be set to any value among 55%, 60%, 70%, 80%, 90%, 95%, 99% or the range formed between any two values.

[0068] The time of the first water-oxygen treatment is 0.2 h to 10 h. In this embodiment, the second functional layer is set with a set standing time based on the humidity in the water-oxygen atmosphere environment. For example, when the humidity of the water-oxygen atmosphere environment is 40%, the second functional layer is left standing in the water-oxygen atmosphere environment for 10 h; when the humidity of the water-oxygen atmosphere environment is 50%, the second functional layer is left standing in the water-oxygen atmosphere environment for 9 h; when the humidity of the water-oxygen atmosphere environment is 60%, the second functional layer is left standing in the water-oxygen atmosphere environment for 8 h; when the humidity of the water-oxygen atmosphere environment is 70%, the second functional layer is left standing in the water-oxygen atmosphere environment for 6 h; when the humidity of the water-oxygen atmosphere environment is 80%, the second functional layer is left standing in the water-oxygen atmosphere environment for 4 h; when the humidity of the water-oxygen atmosphere environment is 90%, the second functional layer is left standing in the water-oxygen atmosphere environment for 2 h; when the humidity of the water-oxygen atmosphere environment is 95%, the second functional layer is left standing in the water-oxygen atmosphere environment for 1 h; when the humidity of the water-oxygen atmosphere environment is 99%, the second functional layer is left standing in the water-oxygen atmosphere environment for 0.2 h.

[0069] In the embodiment of the present application, after the preparation of the second functional layer is completed, the first water-oxygen treatment is performed on it to increase the water-oxygen concentration in the second functional layer, so as to create a good water-oxygen environment in the composite film and improve the electron injection ability of the composite film.

[0070] In some embodiments, after the step of forming the second functional layer by disposing the second functional solution on the first functional layer, the following steps are further included:

[0071] Providing a third functional solution containing a second polyol, and disposing the third functional solution on the second functional layer to form a third functional layer.

[0072] In some embodiments, the first inorganic nanomaterial in the first functional solution, the second inorganic nanomaterial and the first polyol in the second functional solution, and the second polyol in the third functional solution are the same as those above, and will not be elaborated here.

[0073] In some embodiments, the step of forming the third functional layer includes:

[0074] The deposited third functional solution is dried to obtain the third functional layer;

[0075] Wherein, the drying is a standing treatment, and the temperature of the standing treatment is 25°C to 30°C. Specifically, the temperature of the standing treatment can be set to any value of 25°C or 30°C or a range formed between any two values.

[0076] The time of the standing treatment is 1 to 10 min. Specifically, the time of the standing treatment can be set to any value of 1 min, 5 min, or 10 min or a range formed between any two values.

[0077] Perform a second water and oxygen treatment on the third functional layer to obtain the composite film.

[0078] Among them, the humidity in the second water and oxygen atmosphere is 55% - 90%. In this embodiment, the humidity in the second water and oxygen atmosphere can be set to any value among 55%, 60%, 70%, 80%, 90%, 95%, 99% or the range formed between any two values.

[0079] The time of the second water and oxygen treatment is 0.2h - 10h. In this embodiment, the third functional layer is set with a static time based on the humidity in the water and oxygen atmosphere environment. For example: when the humidity in the water and oxygen atmosphere environment is 40%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 10h; when the humidity in the water and oxygen atmosphere environment is 50%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 9h; when the humidity in the water and oxygen atmosphere environment is 60%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 8h; when the humidity in the water and oxygen atmosphere environment is 70%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 6h; when the humidity in the water and oxygen atmosphere environment is 80%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 4h; when the humidity in the water and oxygen atmosphere environment is 90%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 2h; when the humidity in the water and oxygen atmosphere environment is 95%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 1h; when the humidity in the water and oxygen atmosphere environment is 99%, the third functional layer is statically placed in the water and oxygen atmosphere environment for 0.2h.

[0080] In the embodiment of the present application, by forming a third functional layer on the second functional layer, through the setting of the second functional layer, when the third functional layer is prepared, polyol is prevented from penetrating downward into the first functional layer, so that the polyol stays on the surface of the first functional layer, avoiding the influence of polyol on electron injection. In addition, by performing a second water and oxygen treatment on the third functional layer, it is ensured that the third functional layer can fully absorb water and oxygen, and the water and oxygen penetrate downward through the second functional layer, thereby increasing the electron transport characteristics of the composite film and affecting the electron injection of the composite film, and improving the electron injection quantity of the composite film.

[0081] In some embodiments, the first functional solution further includes a first solvent; the second functional solution further includes a second solvent; the third functional solution further includes a third solvent.

[0082] In this embodiment, the first solvent, the second solvent, and the third solvent are each independently selected from at least one of water, formamide, monohydric alcohols, and thiol compounds; wherein, the monohydric alcohol is selected from at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, and tert-butanol; the thiol compound is selected from at least one of ethylene glycol bis(3-mercaptopropionate), ethylene glycol dimercaptoacetate, trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetrakis(3-mercaptopropionate), pentaerythritol tetrakis(2-mercaptoacetate), 1,6-hexanedithiol, 1,3-propanedithiol, 1,2-ethanedithiol, and polyethylene glycol dithiol containing 1-10 ethylene glycol repeating units.

[0083] In this embodiment, the first solvent, the second solvent, and the third solvent are the same, preferably an ethanol solvent.

[0084] In some embodiments, the mass concentration of the first inorganic nanomaterial in the first functional solution is 20-40 mg / ml. Specifically, the mass concentration of the first inorganic nanomaterial in the first functional solution can be any value among 20 mg / ml, 25 mg / ml, 30 mg / ml, 35 mg / ml, 40 mg / ml or the range formed between any two values.

[0085] In this embodiment, the first functional solution is prepared by the following steps:

[0086] Provide ZnO material and ethanol solvent, dissolve the ZnO material in the ethanol solvent to form a ZnO solution with a concentration of 35 mg / ml as the first functional solution.

[0087] In some embodiments, the mass concentration of the second inorganic nanomaterial in the second functional solution is 20-40 mg / ml, and the mass concentration of the first polyhydric alcohol is 1-2 mg / ml. Specifically, the mass concentration of the second inorganic nanomaterial in the second functional solution can be any value among 20 mg / ml, 25 mg / ml, 30 mg / ml, 35 mg / ml, 40 mg / ml or the range formed between any two values; the mass concentration of the first polyhydric alcohol in the second functional solution can be any value among 1 mg / ml, 1.5 mg / ml, 2 mg / ml or the range formed between any two values. The second functional solution is prepared by the following steps:

[0088] Provide ZnO material, glycerol, and ethanol solvent, dissolve the ZnO material and glycerol in the ethanol solvent respectively to form a ZnO solution with a concentration of 35 mg / ml and glycerol ink, mix the ZnO solution and glycerol ink according to a set volume ratio to form the second functional solution. In this embodiment, the set volume ratio is 1:20, and the doping mass ratio of glycerol in the second functional solution is 5%.

[0089] In some embodiments, the mass concentration of the second polyol in the third functional solution is 20 - 40 mg / ml. Specifically, the mass concentration of the second polyol in the third functional solution can be any value among 20 mg / ml, 25 mg / ml, 30 mg / ml, 35 mg / ml, 40 mg / ml or the range formed between any two of these values.

[0090] In this embodiment, the third functional solution is prepared by the following steps:

[0091] Provide glycerol and an ethanol solvent, dissolve the glycerol in the ethanol solvent to form a glycerol ink with a concentration of 35 mg / ml as the third functional solution.

[0092] In some embodiments, in step S101, the step of forming the first functional layer specifically includes:

[0093] The deposited first functional solution is dried and then subjected to a first annealing treatment to obtain the first functional layer;

[0094] In this embodiment, the drying is specifically a static treatment, and the temperature of the static treatment is 25°C - 30°C. Specifically, the temperature of the static treatment can be set to any value among 25°C and 30°C or the range formed between any two of these values.

[0095] The time of the static treatment is 1 - 10 min. Specifically, the time of the static treatment can be set to any value among 1 min, 5 min, 10 min or the range formed between any two of these values.

[0096] The temperature of the first annealing treatment is 75°C - 85°C. Specifically, the temperature of the first annealing treatment can be set to any value among 75°C, 80°C, 85°C or the range formed between any two of these values.

[0097] The time of the first annealing treatment is 10 min - 20 min. Specifically, the time of the first annealing treatment can be set to any value among 10 min, 15 min, 20 min or the range formed between any two of these values.

[0098] In some embodiments, in step S102, the step of forming the second functional layer includes:

[0099] The deposited second functional solution is dried and then subjected to a second annealing treatment to obtain the second functional layer;

[0100] In this embodiment, the drying is specifically a static treatment, and the temperature of the static treatment is 25°C to 30°C. Specifically, the temperature of the static treatment can be set to any value of 25°C or 30°C or the range formed between any two values.

[0101] The time of the static treatment is 1 to 10 minutes. Specifically, the time of the static treatment can be set to any value of 1 minute, 5 minutes, or 10 minutes or the range formed between any two values.

[0102] The temperature of the second annealing treatment is 75°C to 85°C. Specifically, the temperature of the second annealing treatment can be set to any value of 75°C, 80°C, or 85°C or the range formed between any two values.

[0103] The time of the second annealing treatment is 10 minutes to 20 minutes. Specifically, the time of the first annealing treatment can be set to any value of 10 minutes, 15 minutes, or 20 minutes or the range formed between any two values.

[0104] Please refer to Figure 2 As shown, the embodiment of the present application further provides an optoelectronic device. The optoelectronic device contains the above composite film. In some embodiments, the composite film serves as the first carrier functional layer 4 of the optoelectronic device, which is used to improve the electron transport characteristics of the first carrier functional layer 4 and increase the number of electrons injected from the cathode layer 5 to the first carrier functional layer 4, thereby improving the device performance of the optoelectronic device.

[0105] In some embodiments, the shown optoelectronic device includes a stacked anode layer 1, a first carrier functional layer 4, and a cathode layer 5; wherein, the first carrier functional layer 4 is made of the above composite film or prepared by the preparation method of the above composite film.

[0106] In some embodiments, the first carrier functional layer 4 includes a first functional layer 41 and a second functional layer 42 provided on the first functional layer 41. The first functional layer 41 includes inorganic nanomaterials, and the second functional layer 42 includes polyols and the inorganic nanomaterials. The first functional layer 41 is close to the anode layer 3, and the second functional layer 42 is close to the cathode layer 5.

[0107] In some embodiments, the composite film further includes a third functional layer 43, and the third functional layer 43 includes a second polyol. The third functional layer 43 is provided between the second functional layer 42 and the cathode layer 5.

[0108] Please refer to Figure 2As shown, in this embodiment, the optoelectronic device is a normal-positioned optoelectronic device, and the structure of the optoelectronic device is anode layer 1 / second carrier functional layer 2 / light-emitting layer 3 / first carrier functional layer 4 (first functional layer 41 / second functional layer 42 / third functional layer 43) / cathode layer 5. In other embodiments, the optoelectronic device may also be an inverted optoelectronic device, and the structure of the optoelectronic device is cathode layer 5 / first carrier functional layer 4 (third functional layer 43 / second functional layer 42 / first functional layer 41) / light-emitting layer 3 / second carrier functional layer 2 / anode layer 1.

[0109] In some embodiments, the materials of the anode layer 1 and / or the cathode layer 5 include at least one of metals, carbon materials, and metal oxides. The metals include at least one of Al, Ag, Cu, Mo, Au, Ba, Ca, Yb, and Mg; the carbon materials include at least one of graphite, carbon nanotubes, graphene, and carbon fiber; the metal oxides include doped or undoped metal oxides, including at least one of ITO, FTO, ATO, AZO, GZO, IZO, MZO, and AMO, or a composite electrode including a metal sandwiched between doped or undoped transparent metal oxides. The composite electrodes include at least one of AZO / Ag / AZO, AZO / Al / AZO, ITO / Ag / ITO, ITO / Al / ITO, ZnO / Ag / ZnO, ZnO / Al / ZnO, ZnS / Ag / ZnS, ZnS / Al / ZnS, TiO2 / Ag / TiO2, and TiO2 / Al / TiO2. In this embodiment, the anode layer 1 is formed on the substrate to form an ITO / Ag / ITO substrate, and the material of the cathode layer 5 is Ag.

[0110] In some embodiments, the second carrier functional layer 2 includes a hole injection layer and a hole transport layer stacked. The materials of the hole injection layer and / or the hole transport layer include at least one of TFB, CuPc, PVK, Poly-TPD, PFB, DNTPD, TCATA, TCCA, CBP, TPD, NPB, NPD, PEDOT:PSS, TAPC, MCC, F4-TCNQ, HATCN, 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine, polyaniline, transition metal oxides, transition metal sulfides, transition metal stannides, doped graphene, undoped graphene, and C60. In this embodiment, the material of the hole injection layer 21 is PEDOT:PSS, and the material of the hole transport layer 22 is a TFB chlorobenzene solution.

[0111] The optoelectronic device further includes a light-emitting layer disposed between the second carrier functional layer and the first functional layer, and the light-emitting layer 3 is a quantum dot light-emitting layer or an organic light-emitting layer; wherein, the material of the quantum dot light-emitting layer includes at least one of a single-structure quantum dot and a core-shell structure quantum dot, and the material of the single-structure quantum dot, the core material of the core-shell structure quantum dot, and the shell material of the core-shell structure quantum dot are each selected from at least one of II-VI group compounds, IV-VI group compounds, III-V group compounds, and I-III-VI group compounds, and the shell of the core-shell structure quantum dot includes one or more layers; wherein, the II-VI group compounds include, but are not limited to, one or more of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe, the IV-VI group compounds include, but are not limited to, one or more of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe, the III-V group compounds include, but are not limited to, one or more of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb, and the I-III-VI group compounds include, but are not limited to, at least one of CuInS2, CuInSe2, and AgInS2;The materials of the organic light-emitting layer include at least one of 4,4'-bis(N-carbazolyl)-1,1'-biphenyl: tris(2-(p-tolyl)pyridine-C2,N)iridium(III), 4,4',4”-tris(carbazol-9-yl)triphenylamine: tris(2-(p-tolyl)pyridine-C2,N)iridium, diarylanthracene derivatives, stilbene aromatic derivatives, pyrene derivatives, fluorene derivatives, TBPe fluorescent materials, TTPX fluorescent materials, TBRb fluorescent materials, and DBP fluorescent materials, polyacetylene and its derivatives, poly(p-phenylene) and its derivatives, polythiophene and its derivatives, and polyfluorene and its derivatives;

[0112] The first carrier functional layer 4 of the optoelectronic device provided by the embodiment of the present application is prepared by the preparation method of the above composite film. By sequentially forming a second functional layer 42 containing polyol and a third functional layer 43 containing polyol on the first functional layer 41, it is ensured that the polyol does not penetrate downward into the first functional layer 41 or the light-emitting layer 3, thereby avoiding the influence of the insulation of the polyol on the electron transport efficiency and the number of electrons injected. In addition, the third functional layer 43 also provides a good water and oxygen environment inside the first carrier functional layer 4 and at the interface between the first carrier functional layer 4 and the cathode layer 5, so as to improve the number of electrons injected from the cathode layer 5 into the first carrier functional layer 4 and provide the electron transport efficiency of the first carrier functional layer 4, thereby increasing the number of electrons in the light-emitting layer 3, balancing the number of carriers in the light-emitting layer 3, and realizing the improvement of the light-emitting performance and service life of the optoelectronic device.

[0113] Please refer back to Figure 2 As shown, in some embodiments, the optoelectronic device further includes a light extraction layer 6 and a fourth functional layer 7; the light extraction layer 6 is formed on the cathode layer 5, and the fourth functional layer 7 is formed on the light extraction layer 6.

[0114] In some embodiments, the water content in the fourth functional layer is 200 ppm to 1000 ppm; in this embodiment, the water content in the fourth functional layer can be any value among 200 ppm, 300 ppm, 400 ppm, 500 ppm, 600 ppm, 700 ppm, 800 ppm, 900 ppm, 1000 ppm or a range formed between any two values.

[0115] In some embodiments, the oxygen content in the fourth functional layer is 20 ppm to 100 ppm; in this embodiment, the water content in the fourth functional layer can be any value among 20 ppm, 30 ppm, 40 ppm, 50 ppm, 60 ppm, 70 ppm, 80 ppm, 90 ppm, 100 ppm or a range formed between any two values.

[0116] In some embodiments, the material of the light extraction layer 6 includes N,N'-bis(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (i.e., NPB) and its derivatives.

[0117] In some embodiments, the fourth functional layer 7 includes a third polyol selected from one or more of ethylene glycol, propylene glycol, dipropylene glycol, glycerol, diglycerol, triglycerol, butanediol, 1,2-hexanediol, and 1,2-pentanediol.

[0118] In the embodiments of the present application, by further providing a light extraction layer 6 and a fourth functional layer 7 on the cathode layer 5, the water-oxygen environment of the cathode layer 5 is further regulated by the fourth functional layer 7. Since the cathode layer 5 is relatively thin, the water and oxygen absorbed by the fourth functional layer 7 can penetrate into the space between the cathode layer 5 and the electron functional layer 4, thereby further adjusting the number of electrons injected from the cathode layer 5 to the electron functional layer 4, increasing the number of electrons in the light-emitting layer 3, balancing the number of carriers in the light-emitting layer 3, and improving the luminous performance and service life of the optoelectronic device.

[0119] Please refer to Figure 4 As shown, based on the above optoelectronic device, the embodiments of the present application further provide a method for manufacturing an optoelectronic device for manufacturing the above optoelectronic device, including the following steps:

[0120] Step S10, providing an anode layer, and forming a first carrier functional layer on the light-emitting layer by the preparation method of the composite film.

[0121] In this embodiment, the optoelectronic device further includes a second carrier functional layer and a light-emitting layer. The second carrier functional layer is disposed between the anode layer and the first carrier functional layer, and the light-emitting layer is disposed between the second carrier functional layer and the first carrier functional layer. The second carrier functional layer is formed on the anode layer by a solution method, and the light-emitting layer is formed on the second carrier functional layer by a solution method.

[0122] In this embodiment, the preparation method of the first carrier functional layer is as follows:

[0123] Dissolve the ZnO material in an ethanol solvent to prepare a first functional solution, dissolve glycerol and the ZnO material in an ethanol solvent respectively and mix them according to a volume ratio of 1:20 to prepare a second functional solution, and dissolve glycerol in an ethanol solvent to prepare a third functional solution.

[0124] Set the first functional solution on the light-emitting layer to form a first functional layer.

[0125] Set the second functional solution on the first functional layer to form a second functional layer.

[0126] A third functional solution is provided on the second functional layer to form a third functional layer, thereby obtaining the composite film.

[0127] The composite film is exposed to a water-oxygen atmosphere with a humidity of 95% and left standing for 1 h to obtain the second charge carrier functional layer.

[0128] Step S20: A cathode layer is formed on the first charge carrier functional layer.

[0129] The optoelectronic device prepared by the method for preparing an optoelectronic device provided in the embodiments of the present application forms a good water-oxygen condition in the optoelectronic device by providing a third functional layer between the first charge carrier functional layer and the cathode layer and placing the third functional layer in a high-humidity environment during the preparation process to absorb sufficient water and oxygen, so as to improve the electron transport efficiency of the first charge carrier functional layer and the electron injection ability of the cathode layer into the first charge carrier functional layer, thereby improving the carrier number balance in the light-emitting layer and achieving the purpose of improving the device performance and service life of the optoelectronic device; in addition, the first charge carrier functional layer of the optoelectronic device is provided with a second functional layer containing glycerol between the first functional layer and the third functional layer to prevent glycerol from seeping downward into the first functional layer and the light-emitting layer and affecting the electron transport efficiency and electron injection, thereby enabling the optoelectronic device to have good device performance and service life.

[0130] In some embodiments, after step S20 of forming the cathode layer on the first charge carrier functional layer, the following steps are further included:

[0131] A light extraction layer is formed on the cathode layer.

[0132] A fourth functional solution containing a third polyol is provided, and the fourth functional solution is provided on the light extraction layer to form a fourth functional layer.

[0133] In some embodiments, the step of forming the fourth functional layer includes:

[0134] After the deposited fourth functional solution is dried, the fourth functional layer is obtained;

[0135] Wherein, the drying is a standing treatment, the temperature of the standing treatment is 25°C to 30°C. Specifically, the temperature of the standing treatment can be set to any value of 25°C and 30°C or the range formed between any two values.

[0136] The time of the standing treatment is 1 to 10 min. Specifically, the time of the standing treatment can be set to any value of 1 min, 5 min, and 10 min or the range formed between any two values.

[0137] The fourth functional solution further includes a fourth solvent, and the fourth solvent is selected from at least one of water, formamide, monohydric alcohol, and thiol compound;

[0138] Among them, the monohydric alcohol is selected from at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, and tert-butanol; the thiol compound is selected from at least one of ethylene glycol bis(3-mercaptopropionate), ethylene glycol dimercaptoacetate, trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetrakis(3-mercaptopropionate), pentaerythritol tetrakis(2-mercaptoacetate), 1,6-hexanedithiol, 1,3-propanedithiol, 1,2-ethanedithiol, and polyethylene glycol dithiol containing 1-10 ethylene glycol repeating units.

[0139] In this embodiment, glycerol is dissolved in an ethanol solvent to prepare a fourth functional solution, and a fourth functional layer is prepared on the photoextraction layer through the fourth functional solution.

[0140] A third water and oxygen treatment is performed on the fourth functional layer to obtain the optoelectronic device.

[0141] In some embodiments, the step of performing a third water and oxygen treatment on the fourth functional layer includes: placing the fourth functional layer in a third water and oxygen atmosphere for a third water and oxygen treatment; the humidity in the third water and oxygen atmosphere is 55% to 99%, for example: any value or the range formed between any two values among 55%, 60%, 70%, 80%, 90%, 95%, 99%.

[0142] In some embodiments, the standing time of the fourth functional layer in the water and oxygen atmosphere environment is 0.2 h to 10 h. Specifically, the fourth functional layer sets the standing time based on the humidity in the water and oxygen atmosphere environment. For example: when the humidity of the water and oxygen atmosphere environment is 40%, the fourth functional layer stands in the water and oxygen atmosphere environment for 10 h; when the humidity of the water and oxygen atmosphere environment is 50%, the fourth functional layer stands in the water and oxygen atmosphere environment for 9 h; when the humidity of the water and oxygen atmosphere environment is 60%, the fourth functional layer stands in the water and oxygen atmosphere environment for 8 h; when the humidity of the water and oxygen atmosphere environment is 70%, the fourth functional layer stands in the water and oxygen atmosphere environment for 6 h; when the humidity of the water and oxygen atmosphere environment is 80%, the fourth functional layer stands in the water and oxygen atmosphere environment for 4 h; when the humidity of the water and oxygen atmosphere environment is 90%, the fourth functional layer stands in the water and oxygen atmosphere environment for 2 h; when the humidity of the water and oxygen atmosphere environment is 95%, the fourth functional layer stands in the water and oxygen atmosphere environment for 1 h; when the humidity of the water and oxygen atmosphere environment is 99%, the fourth functional layer stands in the water and oxygen atmosphere environment for 0.2 h.

[0143] In this embodiment, the fourth functional layer is placed in a water and oxygen atmosphere environment with a humidity of 95% and stands for 1 h.

[0144] An embodiment of the present application also provides a display device, and the display device includes the above optoelectronic device.

[0145] The display device may be any electronic product with a display function. The electronic product includes but is not limited to a smart phone, a tablet computer, a laptop computer, a digital camera, a digital video camera, a smart wearable device, a smart weighing electronic scale, a vehicle-mounted display, a television, or an e-book reader. Among them, the smart wearable device may be, for example, a smart bracelet, a smart watch, a virtual reality (VR) helmet, etc.

[0146] The present application will be specifically described below through specific embodiments. The following embodiments are only partial embodiments of the present application and do not limit the present application.

[0147] Composite Film Embodiment 1

[0148] Step (1): Dissolve ZnO in an ethanol solution to form a ZnO solution with a concentration of 35 mg / ml as the first functional solution; dissolve glycerol in an ethanol solution to form a third functional solution; mix the first functional solution and the third functional solution according to a volume ratio of 1:20 to form a second functional solution, where the doping mass ratio of glycerol in the second functional solution is 5%.

[0149] Step (2): Form a first functional layer with a thickness of 30 nm from the first functional solution by a solution method. After drying into a film, perform an annealing treatment at 80 °C for 15 min.

[0150] Step (3): Form a second functional layer with a thickness of 10 nm from the second functional solution on the first functional layer by a solution method. After drying into a film, perform an annealing treatment at 80 °C for 15 min to obtain the composite film.

[0151] Composite Film Embodiment 2

[0152] The difference between this embodiment and Composite Film Embodiment 1 is that in step (1), the first functional solution and the third functional solution are mixed according to a volume ratio of 1:100 to form a second functional solution, where the doping mass ratio of glycerol in the second functional solution is 1%.

[0153] Composite Film Embodiment 3

[0154] The difference between this embodiment and Composite Film Embodiment 1 is that in step (1), the first functional solution and the third functional solution are mixed according to a volume ratio of 3:10 to form a second functional solution, where the doping mass ratio of glycerol in the second functional solution is 30%.

[0155] Composite Film Embodiment 4

[0156] The difference between this embodiment and Composite Film Embodiment 1 is that in step (1), propylene glycol is dissolved in an ethanol solution to form a third functional solution; the first functional solution and the third functional solution are mixed at a volume ratio of 1:20 to form a second functional solution, wherein the doping mass ratio of propylene glycol in the second functional solution is 5%.

[0157] Composite Film Embodiment 5

[0158] The difference between this embodiment and Composite Film Embodiment 1 is that after step (3) completes the preparation of the second functional layer, the following steps are further included:

[0159] Step (4), forming a 2-nm-thick third functional layer on the second functional layer by a solution method using the third functional solution;

[0160] Step (5), exposing the dried third functional layer to a normal-temperature environment with a humidity of 95% and standing for 1 h to obtain the composite film.

[0161] Composite Film Embodiment 6

[0162] The difference between this embodiment and Composite Film Embodiment 6 is that in step (5), the dried third functional layer is exposed to a normal-temperature environment with a humidity of 95% and standing for 1 h to obtain the composite film.

[0163] Composite Film Comparative Example 1

[0164] Step (1), forming a 30-nm-thick first electron transport layer by a solution method using a 35-mg / ml ZnO solution to obtain the composite film.

[0165] Test result analysis:

[0166] The composite films respectively prepared from Composite Film Embodiment 1 to Composite Film Embodiment 6 and Composite Film Comparative Example 1 are used as the electron functional layer to prepare an EOD device (single electron device, structure: ITO / composite film / light-emitting layer / composite film / cathode), and the electron transport efficiency / electron injection efficiency are respectively tested. The test results are plotted as J-V curves, as Figure 5 shown. It can be known from the J-V curves of Composite Film Embodiment 1 to Composite Film Embodiment 6 and Composite Film Comparative Example 1 that as the voltage increases, the current density gradually increases. Among them, when the output voltage is 12 V, the current density of the EOD device including Composite Film Embodiment 1 is about 480 mA / cm 2 ; the current density of the EOD device including Composite Film Embodiment 2 is about 340 mA / cm 2 ; the current density of the EOD device including Composite Film Embodiment 3 is about 280 mA / cm 2; The current density of the EOD device including the composite film of Example 4 is about 380 mA / cm 2 ; The current density of the EOD device including the composite film of Example 4 is about 580 mA / cm 2 ; The current density of the EOD device including the composite film of Comparative Example 1 is about 240 mA / cm 2 .

[0167] It can be known from the J-V curves of Comparative Composite Film Examples 1 to 3 that when under the same output voltage condition, the current density of the EOD device including the composite film of Example 1 is greater than that of the EOD device including the composite film of Example 2, and the current density of the EOD device including the composite film of Example 1 is greater than that of the EOD device including the composite film of Example 3. Therefore, the electron transport efficiency of the EOD device can be adjusted by controlling the glycerol doping ratio on the second functional layer, and the electron transport efficiency of the EOD device is maximally improved when the glycerol doping ratio is 5%.

[0168] It can be known from the J-V curves of Comparative Composite Film Example 1 and Composite Film Example 4 that when under the same output voltage condition, the current density of the EOD device including the composite film of Example 1 is greater than that of the EOD device including the composite film of Example 4. Therefore, by doping with dopants having more hydroxyl groups, the hygroscopicity of the second functional layer can be improved to increase the water and oxygen concentration in the composite film, thereby improving the electron transport efficiency of the EOD device.

[0169] It can be known from the J-V curves of Comparative Composite Film Example 1 and Composite Film Example 5 that when under the same output voltage condition, the current density of the EOD device including the composite film of Example 5 is greater than that of the EOD device including the composite film of Example 1. Therefore, by forming a third functional layer on the second functional layer to increase the water and oxygen concentration of the composite film, the electron transport efficiency of the EOD device can be improved.

[0170] It can be known from the J-V curves of Comparative Composite Film Example 5 and Composite Film Example 6 that when under the same output voltage condition, the current density of the EOD device including the composite film of Example 5 is greater than that of the EOD device including the composite film of Example 6. Therefore, by changing the humidity of the exposure environment of the third functional layer, it can adjust and increase the water and oxygen concentration of the composite film, and improve the electron transport efficiency of the EOD device.

[0171] According to the J-V curve graphs of Comparative Examples 1-5 of the composite thin film and Comparative Example 1 of the composite thin film, it can be known that the current density of the EOD devices including Comparative Examples 1-5 of the composite thin film is greater than that of the EOD device of Comparative Example 1 of the composite thin film. Therefore, it can be known that by increasing the second functional layer and the third functional layer to regulate the water and oxygen concentration in the composite thin film, the electron transport efficiency of the EOD device can be improved.

[0172] In summary, the electron transport efficiency of the EOD device prepared by using the composite thin film provided in the embodiment of the present application is superior to that of the conventional EOD device.

[0173] Optoelectronic device Example 1

[0174] Step (1), provide an ITO substrate, inkjet-print a PEDOT:PSS solution on the ITO substrate, after drying to form a film, perform an annealing treatment at 150 °C for 15 min to form a 45-nm-thick hole injection layer;

[0175] Step (2), inkjet-print a TFB solution on the hole injection layer, after drying to form a film, perform an annealing treatment at 230 °C for 30 min to form a 20-nm-thick hole transport layer;

[0176] Step (3), inkjet-print a CdZnSe / ZnSe / ZnS (organic ligand is OA) blue quantum dot ink on the hole transport layer, after drying to form a film, perform an annealing treatment at 100 °C for 10 min to form a 15-nm-thick light-emitting layer;

[0177] Step (4), form an electron functional layer on the light-emitting layer by using the preparation method of Comparative Example 1 of the above composite thin film;

[0178] Step (5), by means of evaporation, deposit Ag on the electron transport layer to form a 30-nm-thick cathode layer;

[0179] Step (6), by means of evaporation, deposit NPB on the cathode layer to form a 65-nm-thick light extraction layer, thus obtaining the optoelectronic device.

[0180] Optoelectronic device Example 2

[0181] The difference between this example and Optoelectronic device Example 1 is that in Step (4), the preparation method of Comparative Example 5 of the above composite thin film is used to form an electron functional layer on the light-emitting layer.

[0182] Optoelectronic device Example 3

[0183] The difference between this example and Optoelectronic device Example 1 is that after completing Step (6), the following steps are further included:

[0184] Step ⑺, forming a 15-μm thick fourth functional layer on the light extraction layer by using glycerol ink through the solution method;

[0185] Step ⑻, exposing the dried fourth functional layer to a normal temperature environment with a humidity of 95% and standing for 1 h to obtain the optoelectronic device.

[0186] Optoelectronic device Example 4

[0187] The difference between this example and Optoelectronic device Example 2 is that after completing Step ⑹, the following steps are further included:

[0188] Step ⑺, forming a 15-μm thick fourth functional layer on the light extraction layer by using glycerol ink through the solution method;

[0189] Step ⑻, exposing the dried second glycerol layer to a normal temperature environment with a humidity of 95% and standing for 1 h to obtain the optoelectronic device.

[0190] Optoelectronic device Example 5

[0191] The difference between this example and Optoelectronic device Example 4 is that in Step ⑻, the dried second glycerol layer is exposed to a normal temperature environment with a humidity of 55% and stands for 1 h to obtain the optoelectronic device.

[0192] Optoelectronic device Comparative Example 1

[0193] The difference between this example and Optoelectronic device Example 1 is that in Step ⑷, the electron functional layer is formed on the light-emitting layer by using the preparation method of the above-mentioned composite film Comparative Example 1.

[0194] The optoelectronic devices separately prepared from Optoelectronic device Examples 1 to 4 and Comparative Example 1 are tested for external quantum efficiency, current efficiency, and operating life, and the test results are shown in Table 1.

[0195] Among them, the external quantum efficiency is tested by an external quantum efficiency optical test instrument; the current efficiency is tested by an FSTAR-FPD optical property measurement device with a 24-V power supply; the operating life is tested by driving the device with a constant current of 2 mA by an FSTAR-FPD optical property measurement device with a 24-V power supply and monitoring the brightness decay rate of the optoelectronic device.

[0196]

[0197]

[0198] Table 1

[0199] According to the test results of Optoelectronic Device Example 1 and Optoelectronic Device Example 2, it can be known that by setting a third functional layer on the second functional layer to increase the water and oxygen concentration in the optoelectronic device, it can comprehensively improve the external quantum efficiency, current efficiency and device lifetime of the optoelectronic device.

[0200] According to the test results of Optoelectronic Device Example 1 and Optoelectronic Device Example 3, as well as Optoelectronic Device Example 2 and Optoelectronic Device Example 4, it can be known that by setting a fourth functional layer on the light extraction layer to increase the water and oxygen concentration in the optoelectronic device, it can comprehensively improve the external quantum efficiency, current efficiency and device lifetime of the optoelectronic device.

[0201] According to the test results of Optoelectronic Device Example 4 and Optoelectronic Device Example 5, it can be known that by changing the environmental humidity during the water and oxygen treatment of the fourth functional layer, the water and oxygen concentration in the optoelectronic device can be increased, and it can comprehensively improve the external quantum efficiency, current efficiency and device lifetime of the optoelectronic device.

[0202] According to the test results of Optoelectronic Device Examples 1-5 and Optoelectronic Device Comparative Example 1, it can be known that by introducing a second functional layer, a third functional layer and a fourth functional layer containing glycerol into the optoelectronic device, the device performance of the optoelectronic device can be significantly improved, and the service life of the optoelectronic device can be extended.

[0203] In summary, according to the comparative analysis of the composite film test results and the comparative analysis of the optoelectronic device test results, it can be known that in the embodiments of the present application, by setting a third functional layer between the electronic functional layer and the cathode layer and by setting a fourth function on the light extraction layer, the water and oxygen conditions in the blue QLED device are improved, thereby promoting the electron transport efficiency of the electronic functional layer and enhancing the electron injection ability from the cathode layer to the electronic functional layer, thereby improving the carrier number balance in the light-emitting layer and achieving the purpose of improving the device performance and service life of the optoelectronic device.

[0204] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present application in other related technical fields is equally within the scope of the patent protection of the present application.

Claims

1. A composite film, characterized in that, Comprising: A first functional layer, the material of the first functional layer comprising a first inorganic nanomaterial; And A second functional layer provided on the surface of the first functional layer, the material of the second functional layer comprising a first polyol and a second inorganic nanomaterial.

2. The composite film according to claim 1, characterized in that, The mass ratio of the first polyol in the second functional layer is 1 wt% to 30 wt%; and / or The water content in the second functional layer is 100 ppm to 1000 ppm; and / or The oxygen content in the second functional layer is 10 ppm to 100 ppm.

3. The composite film according to claim 1, characterized in that, The composite film further comprises a third functional layer, the material of the third functional layer comprising a second polyol; The third functional layer is provided on the surface of the second functional layer away from the first functional layer; Wherein, the water content in the third functional layer is 200 ppm to 1000 ppm; and / or The oxygen content in the third functional layer is 20 ppm to 200 ppm.

4. The composite film according to claim 3, characterized in that, The first inorganic nanomaterial and the second inorganic nanomaterial are each independently selected from one or more of doped or undoped zinc oxide, barium oxide, aluminum oxide, nickel oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanate oxide, aluminum zinc oxide, manganese zinc oxide, tin zinc oxide, lithium zinc oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc stannide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, barium titanate; and the doping elements include one or more of aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, gadolinium; and / or The first polyol and the second polyol are each independently selected from one or more of ethylene glycol, propylene glycol, dipropylene glycol, glycerol, diglycerol, triglycerol, butanediol, 1,2 - hexanediol, 1,2 - pentanediol; and / or The thickness ratio of the first functional layer, the second functional layer and the third functional layer is (8 - 20):(2 - 5):1; and / or The mass ratio of the first inorganic nanomaterial of the first functional layer to the second inorganic nanomaterial of the second functional layer is (4 - 10):

1.

5. A method for preparing a composite film, characterized in that, Including the following steps: Providing a first functional solution containing a first inorganic nanomaterial, depositing the first functional solution to form a first functional layer; Providing a second functional solution containing a first polyol and a second inorganic nanomaterial, disposing the second functional solution on the first functional layer to form a second functional layer, obtaining the composite film.

6. The method for preparing a composite film according to claim 5, characterized in that, After the step of disposing the second functional solution on the first functional layer to form a second functional layer, the following steps are further included: Performing a first water - oxygen treatment on the second functional layer; and / or Providing a third functional solution containing a second polyol, disposing the third functional solution on the second functional layer to form a third functional layer; Performing a second water - oxygen treatment on the third functional layer to obtain the composite film.

7. The method for preparing a composite film according to claim 6, characterized in that, The step of performing the first water - oxygen treatment on the second functional layer includes: placing the second functional layer in a first water - oxygen atmosphere for the first water - oxygen treatment; the humidity in the first water - oxygen atmosphere is 55% - 90%; and / or, the time of the first water - oxygen treatment is 0.2 h - 10 h; and / or The step of performing a second water and oxygen treatment on the third functional layer includes: placing the third functional layer in a second water and oxygen atmosphere for the second water and oxygen treatment; the humidity in the second water and oxygen atmosphere is 55% to 99%; and / or, the time of the second water and oxygen treatment is 0.2 h to 10 h.

8. The method for preparing a composite film according to claim 6, characterized in that, The first inorganic nanomaterial and the second inorganic nanomaterial are each independently selected from one or more of doped or undoped zinc oxide, barium oxide, aluminum oxide, nickel oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanium oxide, aluminum zinc oxide, manganese zinc oxide, tin zinc oxide, lithium zinc oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc stannide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, barium titanate, and the doping elements include one or more of aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, gadolinium; and / or The first polyol and the second polyol are each independently selected from one or more of ethylene glycol, propylene glycol, dipropylene glycol, glycerol, diglycerol, triglycerol, butanediol, 1,2 - hexanediol, 1,2 - pentanediol; and / or The first functional solution further includes a first solvent; and / or, the second functional solution further includes a second solvent; and / or, the third functional solution further includes a third solvent; The first solvent, the second solvent, and the third solvent are each independently selected from at least one of water, formamide, monohydric alcohol, and thiol compound; wherein, the monohydric alcohol is selected from at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec - butanol, and tert - butanol; the thiol compound is selected from at least one of ethylene glycol bis(3 - mercaptopropionate), ethylene glycol dimercaptoacetate, trimethylolpropane tris(3 - mercaptopropionate), pentaerythritol tetrakis(3 - mercaptopropionate), pentaerythritol tetrakis(2 - mercaptoacetate), 1,6 - hexanedithiol, 1,3 - propanedithiol, 1,2 - ethanedithiol, and polyethylene glycol dithiol containing 1 - 10 ethylene glycol repeating units; and / or The mass concentration of the first inorganic nanomaterial in the first functional solution is 20 to 40 mg / ml; and / or The mass concentration of the second inorganic nanomaterial in the second functional solution is 20 to 40 mg / ml, and the mass concentration of the polyol is 1 to 2 mg / ml; and / or The mass concentration of the second polyol in the third functional solution is 20 to 40 mg / ml.

9. The method for preparing the composite film according to claim 6, wherein The step of forming the first functional layer includes: After the deposited first functional solution is dried, a first annealing treatment is performed to obtain the first functional layer; wherein, the temperature of the first annealing treatment is 75°C to 85°C, and the time of the first annealing treatment is 10 min to 20 min; and / or The step of forming the second functional layer includes: After the deposited second functional solution is dried, a second annealing treatment is performed to obtain the second functional layer; wherein, the temperature of the second annealing treatment is 75°C to 85°C, and the time of the second annealing treatment is 10 min to 20 min; and / or The step of forming the third functional layer includes: The dried deposited third functional solution forms the third functional layer.

10. An optoelectronic device, wherein It includes a stacked anode layer, a first carrier functional layer, and a cathode layer; Among them, the first carrier functional layer includes a first functional layer and a second functional layer provided on the first functional layer. The first functional layer includes a first inorganic nanomaterial, and the second functional layer includes a first polyol and a second inorganic nanomaterial. The first functional layer is close to the anode layer, and the second functional layer is close to the cathode layer.

11. The optoelectronic device according to claim 10, wherein The first carrier functional layer further includes a third functional layer. The third functional layer includes a second polyol, and the third functional layer is provided between the second functional layer and the cathode layer; and / or The mass ratio of the first polyol in the second functional layer is 1 wt% to 30 wt%; and / or The first inorganic nanomaterial and the second inorganic nanomaterial are each independently selected from one or more of doped or undoped zinc oxide, barium oxide, aluminum oxide, nickel oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanium oxide, aluminum zinc oxide, manganese zinc oxide, tin zinc oxide, lithium zinc oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc stannide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, barium titanate. The doping elements include one or more of aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, gadolinium.

12. The optoelectronic device according to claim 11, wherein The optoelectronic device further includes: a light extraction layer provided on the side of the cathode layer away from the first carrier functional layer; and a fourth functional layer containing a third polyol, the fourth functional layer is provided on the side of the light extraction layer away from the cathode layer; wherein, the water content in the fourth functional layer is 200 ppm to 1000 ppm; and / or, the oxygen content in the fourth functional layer is 20 ppm to 100 ppm.

13. The optoelectronic device according to claim 12, wherein The material of the anode layer and / or the cathode layer includes one or more of metals, carbon materials, and metal oxides. The metals include one or more of Al, Ag, Cu, Mo, Au, Ba, Ca, Yb, and Mg; the carbon materials include one or more of graphite, carbon nanotubes, graphene, and carbon fibers; the metal oxides include doped or undoped metal oxides, including one or more of ITO, FTO, ATO, AZO, GZO, IZO, MZO, and AMO, or include a composite electrode with a metal sandwiched between doped or undoped transparent metal oxides. The composite electrodes include one or more of AZO / Ag / AZO, AZO / Al / AZO, ITO / Ag / ITO, ITO / Al / ITO, ZnO / Ag / ZnO, ZnO / Al / ZnO, ZnS / Ag / ZnS, ZnS / Al / ZnS, TiO2 / Ag / TiO2, and TiO2 / Al / TiO2; and / or The optoelectronic device further includes a second carrier functional layer disposed between the anode layer and the first functional layer. The second carrier functional layer includes a hole transport layer and / or a hole injection layer. The material of the hole transport layer and / or the hole injection layer includes at least one of TFB, CuPc, PVK, Poly-TPD, PFB, DNTPD, TCATA, TCCA, CBP, TPD, NPB, NPD, PEDOT:PSS, TAPC, MCC, F4-TCNQ, HATCN, 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine, polyaniline, transition metal oxides, transition metal sulfides, transition metal stannides, doped graphene, undoped graphene, and C60; and / or The optoelectronic device further includes a light-emitting layer disposed between the second carrier functional layer and the first functional layer, and the light-emitting layer is a quantum dot light-emitting layer or an organic light-emitting layer; wherein, the material of the quantum dot light-emitting layer includes at least one of single-structure quantum dots and core-shell structure quantum dots, the material of the single-structure quantum dots, the core material of the core-shell structure quantum dots, and the shell material of the core-shell structure quantum dots are respectively selected from at least one of II-VI group compounds, IV-VI group compounds, III-V group compounds, and I-III-VI group compounds, and the shell layer of the core-shell structure quantum dots includes one or more layers; wherein, the II-VI group compounds include at least one of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe, the IV-VI group compounds include at least one of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe, the III-V group compounds include at least one of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb, and the I-III-VI group compounds include at least one of CuInS2, CuInSe2, and AgInS2;The materials of the organic light-emitting layer include at least one of 4,4'-bis(N-carbazolyl)-1,1'-biphenyl: tris(2-(p-tolyl)pyridine-C2,N)iridium(III), 4,4',4''-tris(carbazol-9-yl)triphenylamine: tris(2-(p-tolyl)pyridine-C2,N)iridium, diarylanthracene derivatives, stilbene aromatic derivatives, pyrene derivatives, fluorene derivatives, TBPe fluorescent material, TTPX fluorescent material, TBRb fluorescent material, and DBP fluorescent material, polyacetylene and its derivatives, poly(p-phenylene) and its derivatives, polythiophene and its derivatives, polyfluorene and its derivatives; and / or; The material of the light extraction layer includes N,N'-bis(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine and its derivatives; and / or The first polyol, the second polyol, and the third polyol are each independently selected from one or more of ethylene glycol, propylene glycol, dipropylene glycol, glycerol, diglycerol, triglycerol, butanediol, 1,2-hexanediol, and 1,2-pentanediol.

14. A method for preparing an optoelectronic device for preparing the optoelectronic device according to any one of claims 10 to 13, wherein Comprising the following steps: Providing an anode layer, and forming a first carrier functional layer on the light-emitting layer by the preparation method of the composite film according to any one of claims 5 to 9; Forming a cathode layer on the first carrier functional layer.

15. The method for preparing an optoelectronic device according to claim 14, wherein After forming the cathode layer on the first carrier functional layer, the following steps are further included: Forming a light extraction layer on the cathode layer; Providing a fourth functional solution containing a third polyol, and disposing the fourth functional solution on the light extraction layer to form a fourth functional layer; Performing a third water and oxygen treatment on the fourth functional layer to obtain the optoelectronic device.

16. The method for preparing an optoelectronic device according to claim 15, wherein The step of performing the third water and oxygen treatment on the fourth functional layer includes: placing the fourth functional layer in a third water and oxygen atmosphere for the third water and oxygen treatment; the humidity in the third water and oxygen atmosphere is 55% to 99%; and / or, the time of the third water and oxygen treatment is 0.2 h to 10 h.

17. The manufacturing method of the optoelectronic device according to claim 15, wherein, The step of forming the fourth functional layer includes: After the formed fourth functional solution is dried, the fourth functional layer is obtained; Wherein, the fourth functional solution further includes a fourth solvent, and the fourth solvent is selected from at least one of water, formamide, monohydric alcohol, and thiol compounds; Wherein, the monohydric alcohol is selected from at least one of methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, and tert-butanol; the thiol compound is selected from at least one of ethylene glycol bis-3-mercaptopropionate, ethylene glycol dimercaptoacetate, trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetra(3-mercaptopropionate), pentaerythritol tetra(2-mercaptoacetate), 1,6-hexanedithiol, 1,3-propanedithiol, 1,2-ethanedithiol, and polyethylene glycol dithiol containing 1 to 10 ethylene glycol repeating units; and / or The third polyol is selected from one or more of ethylene glycol, propylene glycol, dipropylene glycol, glycerol, diglycerol, triglycerol, butanediol, 1,2 - hexanediol, and 1,2 - pentanediol.

18. A display device, wherein, The display device includes the optoelectronic device according to any one of claims 10 to 13.

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