CN112164741B - Charge transport layer and light emitting device - Google Patents
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- CN112164741B CN112164741B CN202011042037.2A CN202011042037A CN112164741B CN 112164741 B CN112164741 B CN 112164741B CN 202011042037 A CN202011042037 A CN 202011042037A CN 112164741 B CN112164741 B CN 112164741B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/14—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a carrier transport control structure, e.g. highly-doped semiconductor layer or current-blocking structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/26—Materials of the light emitting region
Abstract
The application discloses a charge transport layer, which is applied to a light-emitting device with a light-emitting layer and comprises a plurality of composite nanoparticles, wherein each composite nanoparticle comprises a first particle and a coating layer for coating the first particle, the coating layer is a conductive nano layer with energy level matching with the light-emitting layer, and the first particle is a conductive nano particle with high carrier mobility. Also disclosed is a light-emitting device comprising a first electrode, a second electrode, a light-emitting layer and the above charge-transporting layer, wherein the charge-transporting layer is provided between the light-emitting layer and either one of the first electrode and the second electrode.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a charge transport layer and a light emitting device.
Background
Due to the excellent properties such as high carrier mobility, adjustable band gap, adaptability to flexible processes, especially simple processing technology and low cost, perovskite materials have gained great attention in the field of a series of optoelectronic devices. In particular, the perovskite material has the characteristics of high luminous efficiency, narrow emission, adjustable continuous visible light range spectrum and the like, so that the perovskite material is expected to be applied to the display field, especially high-end display.
At present, the mainstream perovskite light-emitting diode adopts a laminated device structure, namely a hole transport layer and an electron transport layer are clamped between a perovskite light-emitting layer and a positive electrode and a negative electrode, and the existence of the charge transport layer can greatly improve the efficiency and the service life of the perovskite light-emitting device, and is an important ring for developing high-performance photoelectric devices; an ideal charge transport layer should have an energy level matched to the perovskite light emitting layer, excellent carrier mobility and higher conductivity; most of the currently commonly used charge transport layer materials are organic semiconductors such as PEDOT, PSS, PTAA, TPBi, B3PY, BCP, etc., but considering stability and lifetime, organic materials have certain disadvantages. Inorganic oxide materials have excellent stability and carrier mobility characteristics, such as NiO, SnO2, etc., but inorganic oxide materials often cannot have the advantages of mobility and energy level matching, and defects on the surface of inorganic ions can greatly improve the probability of non-radiative recombination.
Therefore, it is desirable to provide a new charge transport layer and a light emitting device.
Disclosure of Invention
The embodiment of the application provides a charge transport layer and a light-emitting device, wherein the charge transport layer is applied to the light-emitting device with a light-emitting layer, each composite nanoparticle comprises a first particle and a coating layer for coating the first particle, the coating layer is a conductive nano-layer matched with the energy level of the light-emitting layer, and the first particle is a conductive nano-particle with high carrier mobility. The light-emitting device has the charge transport layer of the composite nanoparticles, so that the light-emitting device has the advantages of stability, high mobility, energy level matching and the like.
The embodiment of the application provides a charge transport layer, which is applied to a light-emitting device with a light-emitting layer, wherein the charge transport layer comprises a plurality of composite nanoparticles, each composite nanoparticle comprises a first particle and a coating layer for coating the first particle, the first particle is a conductive nanoparticle with high carrier mobility, and the coating layer is a conductive nano layer with energy level matching with the light-emitting layer.
In some embodiments, the composite nanoparticle further includes at least one interlayer clad layer, the interlayer clad layer being a layer clad to the first particle and clad by the clad layer, and the interlayer clad layer being a conductive nanolayer for energy level transition and having carrier mobility.
In some embodiments, the materials of the first particles, the interlayer cladding layer, and the cladding layer are all oxide semiconductor materials.
In some embodiments, when the material of the light-emitting layer is FAPBBr3When the coating layer is a titanium dioxide conductive nano layer, the first particles are zinc oxide conductive nano particles, and the coating layer is a titanium dioxide conductive nano layer.
In some embodiments, when the material of the light-emitting layer is MAPbI3When the coating layer is formed by coating the first particles and the second particles, the first particles are tin oxide conductive nano particles, and the coating layer is a zinc oxide conductive nano layer.
In some embodiments, when it is usedThe material of the luminescent layer is FAPBBr3When the coating is formed, the first particles are tin oxide conductive nanoparticles, the interlayer coating is a zinc oxide conductive nano layer, and the coating is a titanium dioxide conductive nano layer.
In some embodiments, when the material of the light-emitting layer is MAPbI3When the coating is formed, the first particles are zinc oxide conductive nanoparticles, the interlayer coating is a titanium dioxide conductive nano layer, and the coating is a ZnMgO conductive nano layer.
In some embodiments, the composite nanoparticles have a particle size ranging from 10nm to 1000 nm.
In some embodiments, the charge transport layer comprises at least one of an electron transport layer and a hole transport layer.
The present application also provides a light emitting device including a first electrode, a second electrode, and a light emitting layer disposed between the first electrode and the second electrode, and further including the charge transport layer as described above, wherein the charge transport layer is disposed between the light emitting layer and either one of the first electrode and the second electrode. .
The application also provides a charge transport layer, which is applied to a light-emitting device with a light-emitting layer, wherein the charge transport layer comprises a plurality of composite nanoparticles, each composite nanoparticle comprises a first particle, a coating layer for coating the first particle, and at least one interlayer coating layer, and the interlayer coating layer is a layer which coats the first particle and is coated by the coating layer; and the first particles are conductive nanoparticles having high carrier mobility, the clad layer is a conductive nano layer having an energy level matching with the light emitting layer, and the interlayer clad layer is a conductive nano layer for energy level transition and having carrier mobility.
The charge transport layer provided by the embodiment of the application is applied to a light-emitting device with a light-emitting layer, the charge transport layer comprises a plurality of composite nanoparticles, each composite nanoparticle comprises a first particle and a coating layer for coating the first particle, wherein the coating layer is a conductive nano layer with energy level matching with the light-emitting layer, the coating layer is used for efficient injection of charges, the first particle is a conductive nano particle with high electron mobility, and the first particle is used for efficient transportation of charges. Optionally, the composite nanoparticle further comprises at least one interlayer coating layer covering the first particle and coated by the coating layer, wherein the interlayer coating layer is a conductive nano layer for energy level transition and having carrier mobility. In addition, the materials of the first particles, the coating layer and the interlayer coating layer are all oxide semiconductors; the luminescent layer is an inorganic perovskite, and the charge transport layer has the characteristics of stability, high mobility and energy level matching, and has important significance and practical value for developing high-performance perovskite luminescent and similar luminescent devices such as quantum dot light-emitting diodes and other photoelectric devices.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a composite nanoparticle provided in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a composite nanoparticle according to another embodiment of the present application.
Fig. 3 is a schematic structural view of a light-emitting device in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Referring to fig. 1 and fig. 3, fig. 1 is a schematic structural diagram of a composite nanoparticle according to an embodiment of the present application, and fig. 3 is a schematic structural diagram of a light emitting device according to an embodiment of the present application. The present application provides a charge transport layer for a light emitting device 100 having a light emitting layer 10, the charge transport layer comprising a plurality of composite nanoparticles 1. As shown in fig. 1, each of the composite nanoparticles 1 includes a first particle 2 and a coating layer 3 coating the first particle 2, the coating layer 3 is a conductive nano-layer having an energy level distribution matching with that of the light emitting layer 10, and the surface defects of the coating layer 3 are low, the coating layer 3 is used for efficient injection of carriers, and the first particle 2 is a conductive nano-particle having high carrier mobility, and the first particle 2 is used for efficient transport of carriers (or charges).
Referring to fig. 2, fig. 2 is a schematic structural diagram of a composite nanoparticle according to another embodiment of the present application. In this embodiment, the difference from the previous embodiment shown in fig. 1 is that, as shown in fig. 2, the composite nanoparticle 1 of this embodiment further includes at least one interlayer coating layer 4, the interlayer coating layer 4 is a layer that coats the first particle 2 and is coated by the coating layer 3, the interlayer coating layer 4 is a conductive nano-layer for energy level transition and having carrier mobility, and the first particle 2, the coating layer 3, and the interlayer coating layer 4 all have high conductivity. It should be noted that the interlayer cladding layer 4 mainly plays a role in smooth transition of energy level, and on the basis that the interlayer cladding layer 4 satisfies the requirements of having energy level transition and energy level matching performance, the interlayer cladding layer 4 further needs to have a good carrier transport performance, and the interlayer cladding layer 4 is used for efficient transport of charges.
In the present application, the material of the composite nanoparticle 1 is an oxide semiconductor material, wherein the first particle 2, the cladding layer 3 and the interlayer cladding layer 4 are all oxide semiconductor materials, such as oxide semiconductor materials including but not limited to tin oxide (SnO)2) Zinc oxide (ZnO), titanium dioxide (TiO)2,) And at least one of ZnMgO.
Referring to fig. 1, in a preferred embodiment, the composite nanoparticle 1 is a film having a two-layer structure, and the composite nanoparticle 1 includes one first particle 2 and one coating layer 3. Wherein, when the material of the luminescent layer 10 is FAPBBr3When the coating layer is formed, the first particles 2 are zinc oxide (ZnO) conductive nanoparticles, and the coating layer 3 is titanium dioxide (TiO)2,) A conductive nanolayer. Wherein, the TiO is2,Energy level mismatch, i.e., energy non-alignment, between the conductive nanolayer and the ZnO conductive nanoparticles, the TiO2,Conductive nanolayer and the light-emitting layer 10, FAPBR3Are matched in energy level, said TiO2,The conductive nano layer is used for high-efficiency injection of current carriers, and the ZnO conductive nano particles are used for high-efficiency transmission of the current carriers.
In another preferred embodiment, when the material of the light-emitting layer 10 is MAPbI3When the first particles 2 are tin oxide (SnO)2) The coating layer 3 is a zinc oxide (ZnO) conductive nano-layer. Wherein the ZnO conductive nano-layer and the SnO2Energy level mismatch, i.e., energy non-alignment, between the conductive nanoparticles, the ZnO conductive nanolayer, and the light-emitting layer 10, i.e., FAPBBr3The ZnO conductive nano layer is used for high-efficiency injection of current carriers, and the SnO2Using conductive nanoparticles for charge carriersHigh-efficiency transmission.
Referring to fig. 2, in a preferred embodiment, the composite nanoparticle 1 is a film having a three-layer structure, and the composite nanoparticle 1 includes one first particle 2, one coating layer 3, and one interlayer coating layer 4 that coats the first particle 2 and is coated by the coating layer 3. Wherein, when the material of the luminescent layer 10 is FAPBBr3When the first particles are tin oxide (SnO)2) The conductive nano-particles are arranged on the surface of the substrate, the interlayer coating layer is a zinc oxide (ZnO) conductive nano-layer, and the coating layer is titanium dioxide (TiO)2,) A conductive nanolayer. Wherein, the TiO is2,Conductive nanolayer, the SnO2Energy level mismatch, i.e., energy misalignment, between the conductive nanoparticles and the ZnO conductive nanolayer, the TiO being2,Conductive nanolayer and the light-emitting layer 10, FAPBR3Are matched in energy level, said TiO2,The conductive nano-layer is used for the efficient injection of current carriers, and the SnO2The conductive nano-particles are used for high-efficiency transmission of current carriers, and the ZnO conductive nano-layer is used for energy level transition and for high-efficiency transmission of current carriers.
In other preferred embodiments, when the material of the light-emitting layer 10 is MAPbI3When the coating is formed, the first particles are zinc oxide (ZnO) conductive nanoparticles, and the interlayer coating layer is titanium dioxide (TiO)2,) And the coating layer is a ZnMgO conductive nano layer. Wherein the ZnMgO conductive nano-layer, the ZnO conductive nano-particles and the TiO2,Energy level mismatch, i.e., energy misalignment, between the ZnMgO conductive nanolayers and the light-emitting layer 10, i.e., FAPBR3The ZnMgO conductive nano-layer is used for high-efficiency injection of current carriers, the ZnO conductive nano-particles are used for high-efficiency transmission of the current carriers, and the TiO is used for high-efficiency transmission of the current carriers2,The conductive nanolayers are used for energy level transitions and for efficient transport of carriers. In the present application, the composite nanoparticle 1 includes, but is not limited to, a film having only one first particle 2 and one coating layer 3, and the composite nanoparticle 1 further includes, but is not limited to, a film having one first particle 2, one coating layer 3 and one coating layer 3One layer of the interlayer coating layer 4, the composite nanoparticle 1 may also be a layer including one first particle 2, one layer of the coating layer 3 and more layers of the interlayer coating layer 4, and the performance of the composite nanoparticle 1 mainly depends on the selection of the materials of the first particle 1, the coating layer 3 and the interlayer coating layer 4.
Wherein, the materials of the first particle 2 and the cladding layer 3 in the same composite nanoparticle 1 are generally different, or the materials of the interlayer cladding layer 4 in the same composite nanoparticle 1 are generally different, the first particle 2, the cladding layer 3 and the interlayer cladding layer 4 are generally mismatched in energy level distribution, in other words, the cladding layer 3 and the interlayer cladding layer 4 of the first particle 2 in one composite nanoparticle 1 are not aligned with each other in energy, so as to satisfy the purpose of efficient carrier injection or efficient carrier transmission.
And in some other embodiments, by controlling the shape of the composite nanoparticle 1 and the size of the particle diameter of the composite nanoparticle 1, the first particle 2, the coating layer 3 and the interlayer coating layer 4 are mismatched in energy level distribution, so that the properties of the composite nanoparticle 1 are changed. For example, the shape of the composite nanoparticle 1 may be spherical or ellipsoidal.
In a preferred embodiment, the composite nanoparticle 1 has a particle size ranging from 10nm to 1000 nm.
It should be noted that, as shown in fig. 2, the energy level distribution of the cladding layer 3 and the light emitting layer 10 is matched, the interlayer cladding layer 4 is used for gradual energy level transition, the surface defects of the cladding layer 3 and the interlayer cladding layer 4 are all as low as possible, and the cladding layer 3 is mainly responsible for efficient charge injection; the film layer of the composite nanoparticle 1 other than the coating layer 3 is mainly responsible for efficient transfer of carriers or charges, and the film layer responsible for charge transfer includes, for example, the first particles 2, the interlayer coating layer 4, and other particle film layers that may be interposed between the first particles 2 and the coating layer 3, and the materials of the first particles 2, the interlayer coating layer 4, and the other particle film layers are all selected from oxide semiconductor nanomaterials having high carrier mobility and high conductivity. Wherein the other particle film layers are not specifically illustrated and described in the embodiments of the present application, but may exist in the composite nanoparticle 1, and are not limited and further described herein. Referring to fig. 3, the present application further provides a light emitting device 100, where the light emitting device 100 includes a first electrode 20, a second electrode 30, and the light emitting layer 10 sandwiched between the first electrode 20 and the second electrode 30, and the light emitting device 100 further includes a charge transport layer as described in the present application, where the charge transport layer is disposed between the light emitting layer 10 and any one of the first electrode 20 and the second electrode 30. Further, as shown in fig. 3, the charge transport layer is at least one of a first charge transport layer 40 sandwiched between the first electrode 20 and the light emitting layer 10, and a second charge transport layer 50 sandwiched between the second electrode 30 and the light emitting layer 10, the first charge transport layer 40 injects and transports charges from the first electrode 20 to the light emitting layer 10, and the second charge transport layer 50 injects and transports charges from the second electrode 30 to the light emitting layer 10; wherein the charge transport layer is at least one of a hole transport layer and an electron transport layer.
As shown in fig. 3, in a preferred embodiment, the first electrode 20 serves as an anode, the second electrode 30 serves as a cathode, the first charge transport layer 40 serves as a hole transport layer, and the second charge transport layer 50 serves as an electron transport layer, and in particular, the light emitting device 100 includes an anode and a cathode and the light emitting layer 10. In the light-emitting layer 10, light is generated by recombination of electrons and holes. At least one Hole Transport Layer (HTL) is disposed between the anode and the light-emitting layer 10, which provides transport of holes from the anode and injection of holes into the light-emitting layer 10. Similarly, at least one Electron Transport Layer (ETL) is disposed between the cathode and the light emitting layer 10, the electron transport layer providing transport of electrons from the cathode and injection of electrons into the light emitting layer 10.
In the present application, the light-emitting layer 10 is a perovskite light-emitting layer, the material of the light-emitting layer 10 is an inorganic perovskite, and the chemical formula of the inorganic perovskite is ABX3The A, B, X bit elements are all inorganic chemical elements, the A bit element is at least one of Cs, Rb and K, the B bit element is at least one of Pb, Sn, Bi, Sr, Ca and Ba, and the X bit element is at least one of Cl, Br and I.
As a preferred embodiment, the inorganic perovskite material of the light-emitting layer 10 is selected from FAPbBr3The material of the coating layer 3, such as the titanium dioxide, has a suitable electronic energy level and is matched with the perovskite material FAPBR of the luminescent layer 103The material of the first particles 2, such as zinc oxide, has a compatible electron mobility of more than 100cm2VS, the above zinc oxide has excellent electron mobility. The first particles 2 are combined with the coating layer 3 to obtain the composite nanoparticle 1, and the composite nanoparticle 1 has a more excellent material for a charge transport layer.
As a preferred embodiment, the inorganic perovskite material of the light-emitting layer 10 may also be selected from MAPbI3。
And in other embodiments, the material of the light emitting layer 10 includes, but is not limited to, at least one of a perovskite light emitting layer, a quantum dot light emitting layer.
In the present application, as shown in fig. 1 to 3, the charge transport layer is applied to a light emitting device 100 having a light emitting layer 10, the charge transport layer includes a plurality of composite nanoparticles 1, wherein each of the composite nanoparticles 1 includes a first particle 2 and a coating layer 3 coating the first particle 2, the coating layer 3 is a conductive nano-layer having an energy level matching with the light emitting layer 10, and surface defects of the coating layer 3 are low, the coating layer 3 is used for efficient injection of charges, and the first particle 2 is a conductive nano-particle having high electron mobility, the first particle 2 is used for efficient transport of charges; optionally, the composite nanoparticle 1 further comprises at least one interlayer coating layer 4 coating the first particle 2 and coated by the coating layer 3, wherein the interlayer coating layer 4 is a conductive nano-layer for energy level transition and having carrier mobility; the first particles 2, the coating layer 3, and the interlayer coating layer 4 are all made of an oxide semiconductor. The scheme of designing and developing the charge transport layer with the characteristics of stability, high mobility and energy level matching has important significance and practical value for developing high-performance perovskite light-emitting and similar light-emitting devices such as quantum dot light-emitting diodes and other photoelectric devices. And the development of the perovskite light-emitting device with high efficiency and stability is assisted by preparing the composite nano particles and combining the advantages of different oxide semiconductor materials selected from different particle layers.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above detailed description is provided for a charge transport layer and a light emitting device provided in the embodiments of the present application, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (9)
1. A charge transport layer applied to a light emitting device having a light emitting layer, wherein the charge transport layer comprises a plurality of composite nanoparticles, each of the composite nanoparticles comprises a first particle and a coating layer for coating the first particle, wherein the first particle is a conductive nanoparticle with high carrier mobility, and the coating layer is a conductive nanolayer with energy level matching with the light emitting layer;
the composite nanoparticle further comprises at least one interlayer coating layer, wherein the interlayer coating layer is a layer which coats the first particle and is coated by the coating layer, and the interlayer coating layer is a conductive nano layer which is used for energy level transition and has carrier mobility.
2. The charge transport layer according to claim 1, wherein the materials of the first particles, the interlayer clad layer, and the clad layer are all oxide semiconductor materials.
3. The charge transport layer of claim 1, wherein when the material of the light emitting layer is FAPbBr3When the coating layer is a titanium dioxide conductive nano layer, the first particles are zinc oxide conductive nano particles, and the coating layer is a titanium dioxide conductive nano layer.
4. The charge transport layer of claim 1 wherein the material of the light emitting layer is MAPbI3When the coating layer is formed by coating the first particles and the second particles, the first particles are tin oxide conductive nano particles, and the coating layer is a zinc oxide conductive nano layer.
5. The charge transport layer of claim 1, wherein when the material of the light emitting layer is FAPbBr3When the coating is formed, the first particles are tin oxide conductive nanoparticles, the interlayer coating is a zinc oxide conductive nano layer, and the coating is a titanium dioxide conductive nano layer.
6. The charge transport layer of claim 1 wherein the material of the light emitting layer is MAPbI3When the coating is formed, the first particles are zinc oxide conductive nanoparticles, the interlayer coating is a titanium dioxide conductive nano layer, and the coating is a ZnMgO conductive nano layer.
7. The charge transport layer of claim 1, wherein the composite nanoparticles have a particle size ranging from 10nm to 1000 nm.
8. The charge transport layer of claim 1, wherein the charge transport layer comprises at least one of an electron transport layer and a hole transport layer.
9. A light-emitting device comprising a first electrode, a second electrode, and a light-emitting layer provided between the first electrode and the second electrode, characterized by further comprising the charge-transporting layer according to any one of claims 1 to 8, wherein the charge-transporting layer is provided between the light-emitting layer and any one of the first electrode and the second electrode.
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