Thin film, preparation method thereof, photoelectric device and display device

Abstract

The invention belongs to the technical field of display, and relates to a thin film, a preparation method thereof, a photoelectric device and a display device. The film comprises: a polymer barrier layer having an opening; an excitation unit and a luminescent material are arranged in the opening; wherein the material of the excitation unit comprises metal nanoparticles. The excitation unit containing the metal nanoparticles in the opening has a surface plasmon effect, so that the excitation efficiency of the luminescent material can be effectively improved, and the luminescent effect is enhanced.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a thin film and a method for preparing the same, as well as optoelectronic devices and display apparatuses. Background Technology

[0002] Micro-LED technology is considered the next generation of display technology in the consumer electronics field. Although Micro-LED still faces technical challenges in areas such as chips, mass transfer, and full-color technology, its outstanding characteristics, such as high resolution, fast response, low power consumption, and long lifespan, can meet the needs of ultra-small and ultra-large displays, such as virtual / augmented displays, demonstrating enormous application potential and attracting extensive research in academia and industry.

[0003] However, the luminous efficiency of the color conversion layer in Micro-LEDs needs further improvement. Summary of the Invention

[0004] Based on this, the present application provides a thin film and a method for preparing the same, as well as an optoelectronic device and a display device.

[0005] To address the aforementioned technical problems, this application provides a thin film, employing the technical solution described below:

[0006] A thin film comprising:

[0007] Polymer barrier layer with openings;

[0008] The opening contains an excitation unit and a luminescent material; wherein the material of the excitation unit includes metal nanoparticles.

[0009] To address the aforementioned technical problems, this application also provides a method for preparing a thin film, employing the technical solution described below:

[0010] A method for preparing a thin film, the method comprising the following steps:

[0011] Provide a polymer barrier layer;

[0012] A first mixed solution containing metal nanoparticles is disposed on the polymer barrier layer, so that the polymer barrier layer forms an opening, and an excitation unit containing the metal nanoparticles is formed within the opening;

[0013] A luminescent material is placed inside the opening to obtain a thin film.

[0014] To address the aforementioned technical problems, this application also provides an optoelectronic device, which employs the following technical solution:

[0015] An optoelectronic device includes a light-emitting thin film as described above, or a thin film prepared by the thin film preparation method described above.

[0016] To address the aforementioned technical problems, this application also provides a display device that employs the following technical solution:

[0017] A display device comprising the optoelectronic device described above.

[0018] Compared with the prior art, the embodiments of this application have the following advantages: the excitation unit containing metal nanoparticles in the opening has a surface plasmon effect, which can effectively improve the excitation efficiency of the luminescent material and enhance the luminescence effect. Attached Figure Description

[0019] To more clearly illustrate the solution of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of one embodiment of an optoelectronic device in this application;

[0021] Figure 2 This is a schematic diagram of another embodiment of an optoelectronic device in this application;

[0022] Figure 3 This is a flowchart of one embodiment of a thin film preparation method in this application.

[0023] Reference numerals: 1. Polymer barrier layer; 101. First surface; 102. Second surface; 11. Opening; 111. Bottom surface; 112. Sidewall; 2. Excitation unit; 3. Light-emitting material; 4. Light-emitting element. Detailed Implementation

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operating state, specifically the orientation shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative purposes and do not impose numerical requirements or establish a numerical order.

[0027] In this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0028] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c," or "at least one of a, b, and c," can both mean: a, b, c, a-b (i.e., a and b), a-c, b-c, a-b-c, where a, b, and c can be single or multiple.

[0029] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0031] This application also provides a thin film, such as... Figure 1 As shown in Figure 2, the thin film includes:

[0032] Polymer barrier layer 1, having an opening 11;

[0033] The opening 11 is provided with an excitation unit 2 and a light-emitting material 3; wherein, the material of the excitation unit 2 includes metal nanoparticles.

[0034] In this embodiment, the excitation unit 2 containing metal nanoparticles in the opening 11 has a surface plasmon effect, which can effectively improve the excitation efficiency of the luminescent material 3 and enhance the luminescence effect.

[0035] In this embodiment, the thin film is used on a photoluminescent device, specifically disposed on the light-emitting element 4 of a Micro-LED, serving as a color conversion layer; the light emitted from the light-emitting element 4 of the Micro-LED excites the light-emitting material 3, causing the light-emitting material 3 to emit light. Of course, the thin film is also used on an electroluminescent device (not shown), specifically disposed between the hole functional layer and the electron functional layer; a voltage is applied to the two electrodes of the electroluminescent device to generate an electric field, and electrons excited by the electric field strike the thin film, ultimately achieving light emission.

[0036] like Figure 1 As shown, in embodiment A, the polymer barrier layer 1 has a first surface 101 and a second surface 102 opposite to each other, and the opening 11 penetrates the first surface 101 and the second surface 102.

[0037] Furthermore, the opening 11 includes a sidewall 112 connecting the first surface 101 and the second surface 102; at least a portion of the sidewall 112 is attached to the excitation unit 2.

[0038] Preferably, the excitation unit 2 completely covers the sidewall 112.

[0039] In this embodiment, the metal nanoparticles stacked on the sidewall 112 of the opening 11 can reduce the light emitted from the luminescent material 3 from entering the adjacent opening 11, thereby reducing crosstalk between different light colors; and its surface plasmon resonance effect can effectively improve luminescence efficiency, achieve fluorescence enhancement, and improve the service life of the film.

[0040] Furthermore, in the extending direction parallel to the second surface 102, the distance between the surface of the excitation unit 2 and the sidewall 112 is 1 to 2 μm.

[0041] In some optional embodiments of this example, in the extension direction perpendicular to the second surface 102, the distance between the surface of the excitation unit 2 and the second surface 102 is a range between any one or any two of the following: 1um, 1.1um, 1.2um, 1.3um, 1.4um, 1.5um, 1.6um, 1.7um, 1.8um, 1.9um, 2um, etc.

[0042] like Figure 2 As shown, in embodiment B, the polymer barrier layer 1 has a first surface 101 and a second surface 102 opposite to each other, and the opening 11 penetrates through the first surface 101.

[0043] Furthermore, the opening 11 includes a bottom surface 111 and a sidewall 112 connecting the bottom surface 111 and the first surface 101; at least a portion of the bottom surface 111 and / or at least a portion of the sidewall 112 are attached to the excitation unit 2.

[0044] Preferably, the excitation unit 2 completely covers the bottom surface 111 and the side wall 112.

[0045] In this embodiment, the metal nanoparticles stacked on the bottom surface 111 or sidewall 112 of the opening 11 can reduce the light emitted from the luminescent material 3 from entering the adjacent opening 11, thereby reducing crosstalk between different light colors; and its surface plasmon resonance effect can effectively improve luminescence efficiency, achieve fluorescence enhancement, and improve the service life of the film.

[0046] Furthermore, in the extending direction parallel to the second surface 102, the distance between the surface of the excitation unit 2 and the sidewall 112 is 1 to 2 μm.

[0047] In some optional embodiments of this example, in the extension direction parallel to the second surface 102, the distance between the surface of the excitation unit 2 and the sidewall 112 is a range between any one or any two of 1um, 1.1um, 1.2um, 1.3um, 1.4um, 1.5um, 1.6um, 1.7um, 1.8um, 1.9um, and 2um.

[0048] Furthermore, in the extending direction perpendicular to the second surface 102, the distance between the surface of the excitation unit 2 and the second surface 102 is 1 to 2 μm.

[0049] In some optional embodiments of this example, in the extension direction perpendicular to the second surface 102, the distance between the surface of the excitation unit 2 and the second surface 102 is a range between any one or any two of 1um, 1.1um, 1.2um, 1.3um, 1.4um, 1.5um, 1.6um, 1.7um, 1.8um, 1.9um, and 2um.

[0050] Furthermore, within the opening 11, at least a portion of the luminescent material 3 is in contact with the excitation unit 2.

[0051] Furthermore, the luminescent material 3 is disposed on the surface of the excitation unit 2.

[0052] In this embodiment, when the light emitted by the luminescent material 3 acts on the metal nanoparticles of the excitation unit 2, the metal nanoparticles generate surface plasmon resonance (SPR), which significantly enhances the local electromagnetic field near the surface of the metal nanoparticles. This resonance essentially absorbs the energy of photons and couples it into the metal nanoparticles. Since the luminescent material 3 is located near the surface of the metal nanoparticles, the enhanced local electromagnetic field can effectively excite the luminescent material 3, increase the probability of radiative transition, and thus improve the excitation efficiency of the luminescent material 3, achieving the purpose of fluorescence enhancement.

[0053] Furthermore, the average particle size of the metal nanoparticles is 20–30 nm.

[0054] In some optional embodiments of this example, the average particle size of the metal nanoparticles is within the range of any one or any two of the following: 20nm, 21nm, 22nm, 23nm, 24nm, 25nm, 26nm, 27nm, 28nm, 29nm, 30nm, etc.

[0055] Furthermore, the metal nanoparticles are selected from at least one of silver and its alloys, gold and its alloys, platinum and its alloys, ruthenium and its alloys, rhodium and its alloys, palladium and its alloys, osmium and its alloys, and iridium and its alloys.

[0056] In this embodiment, when light acts on the metal nanoparticles, the metal nanoparticles generate surface plasmon resonance (SPR), which significantly enhances the local electromagnetic field near the surface of the metal nanoparticles. This resonance essentially absorbs the energy of photons and couples it into the metal nanoparticles. When the luminescent material 3 is near the surface of the metal nanoparticles, the enhanced local electromagnetic field can effectively excite the luminescent material 3, increase the probability of radiative transition, and thus improve the excitation efficiency of the luminescent material 3, achieving the purpose of fluorescence enhancement.

[0057] Furthermore, the mass ratio of the metal nanoparticles to the luminescent material 3 is 1:(5-8).

[0058] In this embodiment, the mass ratio of metal nanoparticles to the luminescent material 3 is 1:(5-8), which can significantly enhance the local electromagnetic field near the surface of the metal nanoparticles and effectively excite the luminescent material 3, increase the probability of radiative transition, and thus improve the excitation efficiency of the luminescent material 3, thereby achieving the purpose of fluorescence enhancement.

[0059] In some optional embodiments of this example, the mass ratio of the metal nanoparticles to the luminescent material 3 is any one or any two of the following: 1:5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, etc.

[0060] Furthermore, the polymer barrier layer 1 is made of at least one of polymethyl methacrylate, polyvinyl chloride, polyvinylpyrrolidone, polyethylene, polyvinyl alcohol, polycaprolactam, and polybutylene glycol.

[0061] In this embodiment, polymethyl methacrylate, polyvinyl chloride, polyvinylpyrrolidone, polyethylene, polyvinyl alcohol, polycaprolactam, and polybutylene glycol are high molecular weight polymer materials, which facilitates the preparation of polymer barrier layer 1.

[0062] Furthermore, the thickness of the polymer barrier layer 1 is 4–10 μm.

[0063] In this embodiment, the thickness of the polymer barrier layer 1 is 4-10 μm, which is conducive to forming the opening 11 and to enabling the accumulation of noble metal nanoparticles on the inner surface of the opening 11.

[0064] In some optional embodiments of this example, the thickness of the polymer barrier layer 1 is within the range of any one or any two of 4um, 5um, 6um, 7um, 8um, 9um, 10um, etc.

[0065] Further, the luminescent material 3 includes at least one of a single-structure quantum dot and a core-shell quantum dot, wherein the shell of the core-shell quantum dot has one or more layers; the material of the single-structure quantum dot, the core material of the core-shell quantum dot, and the shell material of the core-shell quantum dot are respectively selected from at least one of group III-IV compounds, group IV-VI compounds, group II-IV compounds, and group III-VI compounds, wherein group I Group I-VI compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgS eS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZn One or more of STe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe; group IV-VI compounds include one or more of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe; II Group IV compounds include 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. Group III-VI compounds include at least one of CuInS2, CuInSe2, and AgInS2.

[0066] This application provides a method for preparing a thin film, such as... Figure 3 As shown, the method includes the following steps:

[0067] S10, Provides a polymer barrier layer;

[0068] S20. A first mixed solution containing metal nanoparticles is disposed on the polymer barrier layer, so that the polymer barrier layer forms an opening, and an excitation unit containing the metal nanoparticles is formed in the opening.

[0069] S30. A light-emitting material is placed inside the opening to obtain a thin film.

[0070] In this embodiment, the excitation unit containing metal nanoparticles in the opening has a surface plasmon effect, which can effectively improve the excitation efficiency of the luminescent material and enhance the luminescence effect; the thin film preparation method described in this application is simple and can prepare thin films over a large area.

[0071] In this embodiment, the thin film is used in photoluminescent devices, specifically disposed on the light-emitting element of a Micro-LED as a color conversion layer; the light emitted from the light-emitting element of the Micro-LED excites the light-emitting material, causing the light-emitting material to emit light. Of course, the thin film is also used in electroluminescent devices, specifically disposed between the hole functional layer and the electron functional layer; a voltage is applied to the electrodes of the electroluminescent device to generate an electric field, and electrons excited by the electric field strike the thin film, ultimately achieving light emission.

[0072] like Figure 1 As shown, in Example A, the polymer barrier layer has a first surface and a second surface opposite to each other, and the opening extends through the first surface and the second surface.

[0073] Furthermore, the opening includes a sidewall connecting the first surface and the second surface; at least a portion of the sidewall is attached to the excitation unit.

[0074] Preferably, the excitation unit completely covers the sidewall.

[0075] In this embodiment, the metal nanoparticles stacked on the sidewalls of the openings can reduce the amount of light emitted from the luminescent material that enters adjacent openings, thus reducing crosstalk between different light colors; and their surface plasmon resonance effect can effectively improve luminescence efficiency, achieve fluorescence enhancement, and improve the lifespan of the film.

[0076] Furthermore, in the extension direction parallel to the second surface, the distance between the excitation unit surface and the sidewall is 1 to 2 μm.

[0077] In some optional embodiments of this example, the distance between the surface of the excitation unit 2 and the second surface 102 in the extension direction perpendicular to the second surface is a range between any one or any two of 1um, 1.1um, 1.2um, 1.3um, 1.4um, 1.5um, 1.6um, 1.7um, 1.8um, 1.9um, and 2um.

[0078] like Figure 2 As shown, in Example B, the polymer barrier layer has opposing first and second surfaces, with the opening penetrating the first surface.

[0079] Furthermore, the opening includes a bottom surface and a sidewall connecting the bottom surface and the first surface; at least a portion of the bottom surface and / or at least a portion of the sidewall is attached to the excitation unit.

[0080] Preferably, the excitation unit completely covers the bottom surface and the sidewall.

[0081] In this embodiment, the metal nanoparticles stacked on the bottom or sidewall of the opening can reduce the light emitted from the luminescent material from entering the adjacent opening, thereby reducing crosstalk between different light colors; and their surface plasmon effect can effectively improve luminescence efficiency, achieve fluorescence enhancement, and improve the service life of the film.

[0082] Furthermore, in the extension direction parallel to the second surface, the distance between the excitation unit surface and the sidewall is 1 to 2 μm.

[0083] In some optional embodiments of this example, the distance between the surface of the excitation unit 2 and the sidewall 112 in the extension direction parallel to the second surface is a range between any one or any two of 1um, 1.1um, 1.2um, 1.3um, 1.4um, 1.5um, 1.6um, 1.7um, 1.8um, 1.9um, and 2um.

[0084] Furthermore, in the extension direction perpendicular to the second surface, the distance between the excitation unit surface and the second surface is 1 to 2 μm.

[0085] In some optional embodiments of this example, the distance between the excitation unit surface and the second surface in the extension direction perpendicular to the second surface is a range between any one or any two of 1um, 1.1um, 1.2um, 1.3um, 1.4um, 1.5um, 1.6um, 1.7um, 1.8um, 1.9um, and 2um.

[0086] Furthermore, within the opening, at least a portion of the luminescent material is in contact with the excitation unit.

[0087] In this embodiment, when the light emitted by the luminescent material acts on the metal nanoparticles of the excitation unit, the metal nanoparticles generate surface plasmon resonance (SPR), which significantly enhances the local electromagnetic field near the surface of the metal nanoparticles. This resonance essentially absorbs the energy of photons and couples it into the metal nanoparticles. Since the luminescent material is located near the surface of the metal nanoparticles, the enhanced local electromagnetic field can effectively excite the luminescent material, increase the probability of radiative transitions, and thus improve the excitation efficiency of the luminescent material, achieving the purpose of fluorescence enhancement.

[0088] Furthermore, the average particle size of the metal nanoparticles is 20–30 nm.

[0089] In some optional embodiments of this example, the average particle size of the metal nanoparticles is within the range of any one or any two of the following: 20nm, 21nm, 22nm, 23nm, 24nm, 25nm, 26nm, 27nm, 28nm, 29nm, 30nm, etc.

[0090] Furthermore, the metal nanoparticles are selected from at least one of silver and its alloys, gold and its alloys, platinum and its alloys, ruthenium and its alloys, rhodium and its alloys, palladium and its alloys, osmium and its alloys, and iridium and its alloys.

[0091] In this embodiment, when light acts on the metal nanoparticles, the metal nanoparticles generate surface plasmon resonance (SPR), which significantly enhances the local electromagnetic field near the surface of the metal nanoparticles. This resonance essentially absorbs the energy of photons and couples it into the metal nanoparticles. Since the luminescent material is located near the surface of the metal nanoparticles, the enhanced local electromagnetic field can effectively excite the luminescent material, increase the probability of radiative transitions, and thus improve the excitation efficiency of the luminescent material, achieving the purpose of fluorescence enhancement.

[0092] Furthermore, the mass ratio of the metal nanoparticles to the luminescent material is 1:(5-8).

[0093] In this embodiment, the mass ratio of metal nanoparticles to the luminescent material is 1:(5-8), which can significantly enhance the local electromagnetic field near the surface of the metal nanoparticles and effectively excite the luminescent material, increase the probability of radiative transition, and thus improve the excitation efficiency of the luminescent material, thereby achieving the purpose of fluorescence enhancement.

[0094] In some optional embodiments of this example, the mass ratio of the metal nanoparticles to the luminescent material is any one or any two of the following: 1:5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, etc.

[0095] Furthermore, the mass concentration of the metal nanoparticles in the first mixed solution is 100–200 mg / mL.

[0096] In this embodiment, the mass concentration of metal nanoparticles in the first mixed solution is 100-200 mg / mL, which enables the metal nanoparticles to effectively excite the luminescent material, increase the probability of radiative transition, and thus improve the excitation efficiency of the luminescent material, thereby achieving the purpose of fluorescence enhancement.

[0097] Furthermore, the first mixed solution also includes a first organic solvent, and the mass concentration of metal nanoparticles in the mixed solution is 100-200 mg / mL, which is sufficient to dissolve the polymer barrier layer and allow the metal nanoparticles to effectively accumulate on the inner surface of the opening, thereby reducing crosstalk between different light colors. In addition, by adjusting the mass concentration of metal nanoparticles in the first mixed solution, the mass concentration of organic solvent in the first mixed solution can be adjusted, thereby controlling the degree of dissolution of the polymer barrier layer. In this embodiment, the polymer barrier layer may or may not be dissolved through, which can be set according to the implementation requirements, and this application does not impose any restrictions.

[0098] In some optional embodiments of this example, the mass concentration of the metal nanoparticles in the first mixed solution is any one or any two of the following: 100 mg / mL, 110 mg / mL, 120 mg / mL, 130 mg / mL, 140 mg / mL, 150 mg / mL, 160 mg / mL, 180 mg / mL, 190 mg / mL, 200 mg / mL.

[0099] In this embodiment, after the first mixed solution is placed on the polymer barrier layer, the first organic solvent dissolves and breaks the polymer molecular chains, restoring their individual small molecule or macromolecule structures, thereby forming an opening; when the first mixed solution is placed on the polymer barrier layer, the first mixed solution has a "coffee ring effect". Therefore, under the action of capillary flow, the metal nanoparticles climb along the inner surface of the opening to form a bank structure with an inverted trapezoidal cross section and surface plasmon resonance effect.

[0100] Furthermore, the first organic solvent includes at least one of alkane solvents, alcohol solvents, ester solvents, and aromatic hydrocarbon solvents.

[0101] In this embodiment, alkane solvents, alcohol solvents, ester solvents, and aromatic hydrocarbon solvents can dissolve and break the polymer molecular chains, thereby forming openings.

[0102] Furthermore, the alkane solvent includes at least one of the following: alkane solvents having 1 to 20 carbon atoms, alkane solvents having 1 to 10 carbon atoms, alkane solvents having 1 to 6 carbon atoms, and haloalkane solvents.

[0103] Optionally, the alkane solvent includes at least one of n-octane, n-hexane, n-heptane, n-nonane, dichloromethane, chloroform, and carbon tetrachloride.

[0104] Furthermore, the alcohol solvent includes at least one of the following: alcohol solvents having 1 to 20 carbon atoms, alcohol solvents having 1 to 10 carbon atoms, alcohol solvents having 1 to 6 carbon atoms, and haloalcohol solvents.

[0105] Optionally, the alcohol solvent includes at least one selected from methanol, ethanol, propanol, butanol, ethylene glycol, and glycerol.

[0106] Further, the general formula of the ester solvent is R1COOR2, where R1 and R2 are independently selected from alkyl groups having 1 to 20 carbon atoms (substituted or unsubstituted), alkyl groups having 1 to 10 carbon atoms (substituted or unsubstituted), and alkyl groups having 1 to 6 carbon atoms (substituted or unsubstituted), wherein the substituent of the substituted alkyl group is a halogen.

[0107] Optionally, R1 and R2 are independently selected from methyl, ethyl, propyl, or butyl; the ester solvent includes at least one of methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and methyl propionate.

[0108] Further, the aromatic hydrocarbon solvent includes at least one of the following: aromatic hydrocarbon solvents having 6 to 20 carbon atoms, aromatic hydrocarbon solvents having 12 to 20 carbon atoms, aromatic hydrocarbon solvents having 6 to 12 carbon atoms, aromatic hydrocarbon solvents having 8 to 18 carbon atoms, and halogenated aromatic hydrocarbon solvents.

[0109] Optionally, the aromatic hydrocarbon solvent includes at least one of diethylbenzene, trimethylbenzene, propylbenzene, cumene, p-toluene-cumene, cyclohexylbenzene, butadiene, 1-methylnaphthalene, chlorobenzene, and indene.

[0110] Furthermore, the step of setting the first mixed solution containing metal nanoparticles on the polymer barrier layer specifically includes: setting droplets of the first mixed solution on the polymer barrier layer and allowing it to stand and dry for 10 to 60 minutes.

[0111] In this embodiment, allowing the mixture to stand and dry for 10 to 60 minutes facilitates the evaporation of the first mixed solution and enables the metal nanoparticles to effectively accumulate on the inner surface of the opening, forming a stable bank structure with an inverted trapezoidal cross-section.

[0112] In some optional embodiments of this example, the static drying time is any one or any two of the following: 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min.

[0113] Furthermore, the volume of the droplet is 500–800 pL.

[0114] In this embodiment, the volume of the droplet is adjusted to control the degree of dissolution of the polymer barrier layer; and in this embodiment, the polymer barrier layer may or may not be dissolved and penetrated, which can be set according to the implementation requirements, and this application does not impose any restrictions here.

[0115] In some optional embodiments of this example, the volume of the droplet is any one or any two of 500 pL, 550 pL, 600 pL, 650 pL, 700 pL, 750 pL, 800 pL, etc.

[0116] Furthermore, the step of setting the luminescent material in the opening specifically includes: providing a second mixed solution containing the luminescent material, setting the second mixed solution in the opening, and performing a drying process.

[0117] Furthermore, the second mixed solution also includes a second organic solvent, which includes at least one of chloroform, toluene, n-hexane, cyclohexane, n-heptane, n-octane, cycloheptane, and dioxane.

[0118] In this embodiment, the second mixed solution inside the opening is dried to facilitate the volatilization of the dispersant, allowing the luminescent material to be deposited in the opening.

[0119] Optionally, the mass concentration of the luminescent material in the second mixed solution is 10 mg / mL to 30 mg / mL, for example, any one or any two of 10 mg / mL, 15 mg / mL, 20 mg / mL, 25 mg / mL, and 30 mg / mL. The luminescent material only needs to be dispersed in the second mixed solution; its concentration is not limited in this embodiment.

[0120] Furthermore, the polymer barrier layer is made of at least one of polymethyl methacrylate, polyvinyl chloride, polyvinylpyrrolidone, polyethylene, polyvinyl alcohol, polycaprolactam, and polybutylene glycol.

[0121] In this embodiment, polymethyl methacrylate, polyvinyl chloride, polyvinylpyrrolidone, polyethylene, polyvinyl alcohol, polycaprolactam, and polybutylene glycol are high molecular weight polymer materials, which facilitates the preparation of the polymer barrier layer.

[0122] Furthermore, the thickness of the polymer barrier layer is 4–10 μm.

[0123] In some optional embodiments of this example, the thickness of the polymer barrier layer 1 is within the range of any one or any two of 4um, 5um, 6um, 7um, 8um, 9um, 10um, etc.

[0124] In this embodiment, the thickness of the polymer barrier layer is 4-10 μm, which facilitates the dissolution of the polymer barrier layer by the organic solvent in the first mixed solution to form an opening; it can also block the first mixed solution to achieve the purpose of metal nanoparticles accumulating on the inner surface of the opening.

[0125] Further, the luminescent material includes at least one of single-structure quantum dots and core-shell structure quantum dots, wherein the shell of the core-shell structure quantum dots has one or more layers; 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 group I-VI compounds, group IV-VI compounds, group II-IV compounds, and group III-VI compounds, wherein group I... Group I-VI compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgS eS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZn One or more of STe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe; group IV-VI compounds include one or more of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe; II Group IV compounds include 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. Group III-VI compounds include at least one of CuInS2, CuInSe2, and AgInS2.

[0126] This application also provides an optoelectronic device, such as... Figure 1 As shown, the optoelectronic device includes the thin film described above, or includes a thin film prepared by the thin film preparation method described above.

[0127] Furthermore, the optoelectronic device also includes a light-emitting element 4, the thin film is disposed on the light-emitting side of the light-emitting element 4, and the opening 11 is disposed corresponding to the light-emitting element 4, and the excitation unit 2 is close to the light-emitting element 4.

[0128] In this embodiment, the thin film is used in a photoelectric device as a color conversion layer; the light emitted from the light-emitting element 4 excites the light-emitting material 3, causing the light-emitting material 3 to emit light.

[0129] like Figure 1 As shown, in embodiment A, at least a portion of the surface of the light-emitting element 4 located within the opening 11 is attached to the excitation unit 2.

[0130] In this embodiment, the excitation unit 2 located on the surface of the light-emitting element 4 inside the opening 11 effectively improves the luminous efficiency through the surface plasmon resonance effect, thereby achieving fluorescence enhancement and improving the lifespan of the light-emitting device.

[0131] Furthermore, in the extension direction perpendicular to the second surface 102, the distance between the surface of the excitation unit 2 and the light-emitting element 4 is 1 to 2 μm.

[0132] In some optional embodiments of this example, in the extension direction perpendicular to the second surface 102, the distance between the surface of the excitation unit 2 and the light-emitting element 4 is a range between any one or any two of 1um, 1.1um, 1.2um, 1.3um, 1.4um, 1.5um, 1.6um, 1.7um, 1.8um, 1.9um, and 2um.

[0133] The present application will be specifically described below through specific embodiments. The following embodiments are only some embodiments of the present application and are not intended to limit the present application.

[0134] Example 1

[0135] (1) Polymethyl methacrylate is coated onto the Micro-LED blue light-emitting element to form a 5µm polymer barrier layer;

[0136] (2) A droplet of a first mixed solution with a mass concentration of 150 mg / mL (wherein, the metal nanoparticles are Au and the first organic solvent is chlorobenzene and cyclohexylbenzene in a mass ratio of 1:1) was printed on the polymer barrier layer. The volume of the droplet was 600 pL. After standing and drying for 40 min, an excitation unit containing metal nanoparticles was formed in the opening.

[0137] (3) Provide a second mixed solution, which includes a luminescent material (CdZnSe / ZnS) and a second organic solvent (n-octane); place the second mixed solution in the opening and anneal the second mixed solution, wherein the annealing temperature is 100°C and the time is 15 min, so that the luminescent material is deposited in the opening to obtain a luminescent film.

[0138] Example 2

[0139] The difference from Example 1 is that the metal nanoparticles used in the first mixed solution in step (2) are Ag.

[0140] Example 3

[0141] The difference from Example 1 is that the metal nanoparticles used in the first mixed solution in step (2) are Pt.

[0142] Example 4

[0143] The difference from Example 1 is that the organic solvent of the first mixed solution in step (2) is chlorobenzene and dihexylbenzene in a mass ratio of 1:1.

[0144] Example 5

[0145] The difference from Example 1 is that the organic solvent of the first mixed solution in step (2) is chlorobenzene and ethylene glycol in a mass ratio of 1:1.

[0146] Example 6

[0147] The difference from Example 1 is that the thickness of the polymer barrier layer in step (1) is 7 μm.

[0148] Example 7

[0149] The difference from Example 1 is that the mass concentration of the first mixed solution in step (2) is 200 mg / mL.

[0150] Example 8

[0151] The difference from Example 1 is that the volume of the droplet in step (2) is 800 pL.

[0152] Example 9

[0153] The difference from Example 1 is that the standing drying time in step (2) is 60 min.

[0154] Comparative Example 1

[0155] (1) An opening is formed by photolithography on a 5µm thick black photoresist on a Micro-LED blue light-emitting element;

[0156] (2) Provide a second mixed solution, which includes a luminescent material (CdZnSe / ZnS) and a second organic solvent (n-octane); place the second mixed solution in the opening, and anneal the second mixed solution at a temperature of 100°C for 15 minutes to deposit the luminescent material in the opening to obtain a luminescent film.

[0157] Comparative Example 2

[0158] The difference from Example 1 is that metal nanoparticles were not set in the first mixed solution in step (2), but SiO2 without surface plasmon properties was used instead.

[0159] Comparative Example 3

[0160] The difference from Example 1 is that step (2) only prints organic solvent (chlorobenzene and cyclohexylbenzene in a mass ratio of 1:1) on the light-emitting element.

[0161] Comparative Example 4

[0162] The difference from Comparative Example 2 is that the organic solvent in the first mixed solution is chlorobenzene and dihexylbenzene in a mass ratio of 1:1.

[0163] Performance testing: Optical performance tests were conducted on the optoelectronic devices prepared in Examples 1-9 and Comparative Examples 1-4. The test conditions for each performance test were as follows: (1) The luminance Lmax (nit) of the quantum dot fluorescent layer for blue light was tested using a color luminance meter; (2) The wavelength, half-width at half-maximum and external quantum efficiency of the quantum dot fluorescent layer were tested using the integrating sphere method; (3) The T90 lifetime (h) when the luminance of the quantum dot fluorescent layer decayed to 90% was tested. The test results are shown in Table 1 below.

[0164] Table 1

[0165]

[0166]

[0167] Analysis of test results: As shown in Table 1, the luminous brightness, external quantum efficiency and lifetime of the optoelectronic devices prepared in Examples 1 to 9 are all better than those prepared in Comparative Examples 1 to 4.

[0168] Among them, the luminescence brightness, external quantum efficiency, and lifetime of Examples 1 and 4-9 are superior to those of Comparative Examples 1-4. The difference is that Comparative Examples 1 and 3-4 do not have an excitation unit containing metal nanoparticles, and the solute in the first mixed solution in Comparative Example 2 is different. It can be seen that setting an excitation unit containing metal nanoparticles can effectively improve the luminescence efficiency and lifetime of the luminescent material. The reason may be that the metal nanoparticles attached to the inner surface of the opening can reduce the light emitted from the luminescent material from entering the adjacent opening, reduce crosstalk between different light colors, and the metal nanoparticles can generate surface plasmon resonance (SPR), which significantly enhances the local electromagnetic field near its surface, thereby effectively exciting the luminescent material, increasing the probability of radiative transition, improving the excitation efficiency of the luminescent material, achieving the effect of fluorescence enhancement, and improving the lifetime of the luminescent film.

[0169] The difference between Comparative Example 3 and Example 1 is that organic solvent is only placed on the polymer barrier layer. The luminescence brightness, external quantum efficiency and lifetime of Example 1 are better than those of Comparative Example 3. Moreover, the wavelength and full width at half maximum of Comparative Example 3 fluctuate. This shows that the metal nanoparticles attached to the inner surface of the opening in Example 1 can reduce the light emitted from the luminescent material from entering the adjacent opening and reduce crosstalk between different light colors.

[0170] Examples 2-3 adjusted the selection of metal nanoparticles, but the luminescence brightness, external quantum efficiency, and lifetime of Examples 2-9 were all better than those of Comparative Example 1; it can be seen that selecting different metal nanoparticles can also improve the luminescence performance of luminescent materials.

[0171] This application also provides a display device, which includes the optoelectronic devices described above.

[0172] In this embodiment, the excitation unit containing metal nanoparticles in the opening of the thin film of the optoelectronic device has a surface plasmon effect, which can effectively improve the excitation efficiency of the luminescent material and enhance the luminescence effect.

[0173] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A thin film, characterized in that, include: Polymer barrier layer with openings; The opening contains an excitation unit and a luminescent material; wherein the material of the excitation unit includes metal nanoparticles.

2. The thin film according to claim 1, characterized in that, The polymer barrier layer has opposing first and second surfaces, and the opening extends through the first and second surfaces, or the opening extends through the first surface; and / or Within the opening, at least a portion of the luminescent material is in contact with the excitation unit; and / or The average particle size of the metal nanoparticles is 20–30 nm; and / or The mass ratio of the metal nanoparticles to the luminescent material is 1:(5-8).

3. The thin film according to claim 2, characterized in that, The opening includes a bottom surface and a sidewall connecting the bottom surface and the first surface; the excitation unit is attached to at least a portion of the bottom surface and / or at least a portion of the sidewall. In the extension direction parallel to the second surface, the distance between the excitation unit surface and the sidewall is 1 to 2 μm; and / or, in the extension direction perpendicular to the second surface, the distance between the excitation unit surface and the bottom surface is 1 to 2 μm; or, The opening includes a sidewall connecting the first surface and the second surface; at least a portion of the sidewall is attached to the excitation unit; In the extension direction parallel to the second surface, the distance between the excitation unit surface and the sidewall is 1 to 2 μm; and / or The luminescent material is disposed on the surface of the excitation unit.

4. The thin film according to any one of claims 1 to 3, characterized in that, The metal nanoparticles are selected from at least one of silver and its alloys, gold and its alloys, platinum and its alloys, ruthenium and its alloys, rhodium and its alloys, palladium and its alloys, osmium and its alloys, and iridium and its alloys; and / or The polymer barrier layer is made of at least one of polymethyl methacrylate, polyvinyl chloride, polyvinylpyrrolidone, polyethylene, polyvinyl alcohol, polycaprolactam, or polybutylene glycol; and / or The thickness of the polymer barrier layer is 4–10 μm; and / or The luminescent material includes at least one of single-structure quantum dots and core-shell quantum dots, wherein the shell of the core-shell quantum dots has one or more layers; the material of the single-structure quantum dots, the core material of the core-shell quantum dots, and the shell material of the core-shell quantum dots are respectively selected from at least one of group II-VI compounds, group IV-VI compounds, group III-V compounds, and group I-III-VI compounds, wherein group I... Group I-VI compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgS eS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZn One or more of STe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe; group IV-VI compounds include one or more of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe; II Group IV compounds include 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, while Group III-VI compounds include at least one of CuInS2, CuInSe2, and AgInS2.

5. A method for preparing a thin film, characterized in that, The method includes the following steps: Provide a polymer barrier layer; A first mixed solution containing metal nanoparticles is disposed on the polymer barrier layer, so that the polymer barrier layer forms an opening, and an excitation unit containing the metal nanoparticles is formed within the opening; A luminescent material is placed inside the opening to obtain a thin film.

6. The thin film preparation method according to claim 5, characterized in that, The polymer barrier layer has opposing first and second surfaces, and the opening extends through the first and second surfaces, or the opening extends through the first surface; and / or Within the opening, at least a portion of the luminescent material is in contact with the excitation unit; and / or The average particle size of the metal nanoparticles is 20–30 nm; and / or The mass ratio of the metal nanoparticles to the luminescent material is 1:(5-8).

7. The thin film preparation method according to claim 6, characterized in that, The opening includes a bottom surface and a sidewall connecting the bottom surface and the first surface; the excitation unit is attached to at least a portion of the bottom surface and / or at least a portion of the sidewall. In the extension direction parallel to the second surface, the distance between the excitation unit surface and the sidewall is 1 to 2 μm; and / or, in the extension direction perpendicular to the second surface, the distance between the excitation unit surface and the bottom surface is 1 to 2 μm; Alternatively, the opening may include a sidewall connecting the first surface and the second surface; The excitation unit is attached to at least a portion of the sidewalls; In the extension direction parallel to the second surface, the distance between the excitation unit surface and the sidewall is 1 to 2 μm; and / or The luminescent material is disposed on the surface of the excitation unit.

8. The thin film preparation method according to any one of claims 5 to 7, characterized in that, The metal nanoparticles are selected from at least one of silver and its alloys, gold and its alloys, platinum and its alloys, ruthenium and its alloys, rhodium and its alloys, palladium and its alloys, osmium and its alloys, and iridium and its alloys; and / or The mass concentration of the metal nanoparticles in the first mixed solution is 100–200 mg / mL; and / or The first mixed solution further includes a first organic solvent, which includes at least one of alkane solvents, alcohol solvents, ester solvents, and aromatic hydrocarbon solvents; and / or The step of setting a first mixed solution containing metal nanoparticles on the polymer barrier layer specifically includes: setting droplets of the first mixed solution on the polymer barrier layer and allowing it to stand and dry for 10–60 min; and / or The step of setting the luminescent material in the opening specifically includes: providing a second mixed solution containing the luminescent material, setting the second mixed solution in the opening, and performing a drying process.

9. The thin film preparation method according to claim 8, characterized in that, The volume of the droplet is 500–800 pL; and / or The alkane solvents include at least one of the following: alkane solvents having 1 to 20 carbon atoms, alkane solvents having 1 to 10 carbon atoms, alkane solvents having 1 to 6 carbon atoms, and haloalkane solvents. Optionally, the alkane solvent is selected from at least one of n-octane, n-hexane, n-heptane, n-nonane, dichloromethane, chloroform, and carbon tetrachloride; and / or The alcohol solvents include at least one of the following: alcohol solvents having 1 to 20 carbon atoms, alcohol solvents having 1 to 10 carbon atoms, alcohol solvents having 1 to 6 carbon atoms, and haloalcohol solvents. Optionally, the alcohol solvent is selected from at least one of methanol, ethanol, propanol, butanol, ethylene glycol, and glycerol; and / or The general formula of the ester solvent is R1COOR2, where R1 and R2 are independently selected from alkyl groups having 1 to 20 carbon atoms (substituted or unsubstituted), alkyl groups having 1 to 10 carbon atoms (substituted or unsubstituted), and alkyl groups having 1 to 6 carbon atoms (substituted or unsubstituted), wherein the substituent of the substituted alkyl group is a halogen. Optionally, the ester solvent is selected from at least one of methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and methyl propionate; and / or The aromatic hydrocarbon solvents include at least one of the following: aromatic hydrocarbon solvents having 6 to 20 carbon atoms, aromatic hydrocarbon solvents having 12 to 20 carbon atoms, aromatic hydrocarbon solvents having 6 to 12 carbon atoms, aromatic hydrocarbon solvents having 8 to 18 carbon atoms, and halogenated aromatic hydrocarbon solvents. Optionally, the aromatic hydrocarbon solvent is selected from at least one of diethylbenzene, trimethylbenzene, propylbenzene, cumene, p-toluene-cumene, cyclohexylbenzene, butylbenzene, 1-methylnaphthalene, chlorobenzene, and indene; and / or The second mixed solution further includes a second organic solvent, which optionally includes at least one of chloroform, toluene, n-hexane, cyclohexane, n-heptane, n-octane, cycloheptane, and dioxane.

10. The thin film preparation method according to any one of claims 5 to 7, characterized in that, The polymer barrier layer is made of at least one of polymethyl methacrylate, polyvinyl chloride, polyvinylpyrrolidone, polyethylene, polyvinyl alcohol, polycaprolactam, or polybutylene glycol; and / or The thickness of the polymer barrier layer is 4–10 μm; and / or The luminescent material includes at least one of single-structure quantum dots and core-shell quantum dots, wherein the shell of the core-shell quantum dots has one or more layers; the material of the single-structure quantum dots, the core material of the core-shell quantum dots, and the shell material of the core-shell quantum dots are respectively selected from at least one of group II-VI compounds, group IV-VI compounds, group III-V compounds, and group I-III-VI compounds, wherein group I... Group I-VI compounds include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgS eS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZn One or more of STe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe; group IV-VI compounds include one or more of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe; II Group IV compounds include 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, while Group I-II and I-VI compounds include at least one of CuInS2, CuInSe2, and AgInS2.

11. An optoelectronic device, characterized in that, It includes the thin film as described in any one of claims 1 to 4, or the thin film prepared by the thin film preparation method as described in any one of claims 5 to 10.

12. The optoelectronic device according to claim 11, characterized in that, The optoelectronic device further includes a light-emitting element, the thin film is disposed on the light-emitting side of the light-emitting element, and the opening is disposed corresponding to the light-emitting element, and the excitation unit is close to the light-emitting element.

13. A display device, characterized in that, Including the optoelectronic devices as described in claim 11 or 12.

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