CN111162182B - Organic electroluminescent device and method of manufacturing the same - Google Patents
Organic electroluminescent device and method of manufacturing the same Download PDFInfo
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- CN111162182B CN111162182B CN201811319920.4A CN201811319920A CN111162182B CN 111162182 B CN111162182 B CN 111162182B CN 201811319920 A CN201811319920 A CN 201811319920A CN 111162182 B CN111162182 B CN 111162182B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/14—Carrier transporting layers
- H10K50/15—Hole transporting layers
- H10K50/155—Hole transporting layers comprising dopants
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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
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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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
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses an organic electroluminescent device and a manufacturing method thereof, which at least comprises a hole injection transport layer, wherein the hole injection transport layer comprises: a base layer formed of a hole transport material; the magnetic conductive nanorods are uniformly distributed in the matrix layer to form a hole conduction array, and the hole conduction array is used for conducting holes from the anode side of the hole injection transport layer to the cathode side of the hole injection transport layer, and the ratio of the thickness of the hole conduction array to the thickness of the matrix layer is 0.95-1. According to the invention, the hole injection transport layer replaces the existing hole transport layer and hole injection layer, and the magnetic conductive nanorod is arranged in the hole injection transport layer and can guide the hole from the anode direction of the hole injection transport layer to the cathode direction, so that the leakage current in the common layer (hole injection transport layer) is eliminated, the color cast is eliminated, and the display effect of the device is improved.
Description
Technical Field
The invention relates to the field of OLEDs (organic light emitting diodes), in particular to an organic electroluminescent device and a manufacturing method thereof.
Background
OLEDs are increasingly used in the fields of mobile phones, televisions, and wearing due to their superior display effects. In order to pursue higher device performance, reduce the driving voltage of the OLED, and increase the operating life of the OLED, it is a direction of important research and development attention of various manufacturers. To lower the driving voltage of the OLED, the potential barrier of the OLED hole injection interface can be reduced by introducing a p-type doped Hole Injection Layer (HIL). Meanwhile, the stability of the device is improved, and the service life of the device is prolonged. Common OLED devices have two layers for hole injection and transport: a p-type doped hole injection layer, wherein a doping object (tray) and a Hole Transport Layer (HTL) material with a certain proportion are subjected to co-evaporation by using an evaporation means to form a HIL layer with the thickness of 1-20 nm; the Hole Transport Layer (HTL) is formed by depositing an HTL material by an evaporation method to form an HTL layer of 30 to 150 nm.
And a Hole Injection (HIL) layer is inserted between the anode and the hole transport layer, so that the potential barrier of an OLED hole injection interface can be reduced, the working voltage of the device is reduced, the stability of the device is improved, and the service life of the device is prolonged.
As shown in fig. 1, a schematic diagram of a conventional OLED device structure includes three sub-pixel units (red, green, and blue) in a pixel unit 100, where each of the three sub-pixel units includes a cathode, an electron injection transport layer, an emission layer, a hole transport layer, a hole injection layer, and an anode. The hole injection layer 105 and the hole transport layer 104 in fig. 1 are common layers, that is, the hole injection layer 105 and the hole transport layer 104 are shared by three sub-pixel units, and the light emitting layers (101, 102, 103) are all formed on the common hole transport layer. In the actual use process, due to the good conductivity of the doped hole injection layer 105, current crosstalk (Cross-talk) occurs between the RGB sub-pixels, and color shift occurs in the low gray scale display state of the device, which affects the quality of the product. For example, the light emitting layer 102 of the blue sub-pixel is turned on to form an on current, but at the same time, the on current also forms a leakage current to cause the light emitting layer 101 of the red sub-pixel adjacent to the light emitting layer 102 to emit light, so that the pixel unit 100 generates color shift when displaying.
Disclosure of Invention
In view of the problems in the prior art, an object of the present invention is to provide an organic electroluminescent device and a method for manufacturing the same, in which a hole injection transport layer is used to replace the existing hole transport layer and hole injection layer, and a magnetic conductive nanorod is disposed in the hole injection transport layer, and the magnetic conductive nanorod can guide holes from the anode direction to the cathode direction of the hole injection transport layer, thereby eliminating the leakage current from the common layer (hole injection transport layer), further eliminating color shift, and improving the display effect of the device.
According to an aspect of the present invention, there is provided an organic electroluminescent device comprising at least one hole injection transport layer, the hole injection transport layer comprising:
a base layer formed of a hole transport material;
the hole injection transport layer is arranged on the base layer, the magnetic conductive nanorods are uniformly distributed in the base layer to form a hole conduction array, the hole conduction array is used for conducting holes from the anode side of the hole injection transport layer to the cathode side of the hole injection transport layer, and the ratio of the thickness of the hole conduction array to the thickness of the base layer is 0.95-1.
Preferably, the magnetic conductive nanorods are vertically or obliquely arranged in the matrix layer.
Preferably, the ratio of the projection length of the magnetic conductive nanorod in the thickness direction of the matrix layer to the thickness of the matrix layer is 0.95-1.
Preferably, the hole transport material is: NPB, mCP, TCTA, m-MTDATA.
Preferably, the diameter of the magnetic conductive nanorod is 1-10 nm, and the length of the magnetic conductive nanorod is 10-150 nm.
Preferably, the material of the magnetic conductive nanorod is Fe 3 O 4 、Fe 2 O 3 Fe/Co alloy, Fe/Ni alloy, FeS or single-layer carbon nanotube.
Preferably, the content of the magnetic conductive nanorods in the hole injection transport layer is 0.01-1g/cm 3 。
Preferably, the extending direction of the magnetic conductive nanorods is perpendicular to the upper and lower surfaces of the matrix layer.
According to an aspect of the present invention, there is provided a method of manufacturing an organic electroluminescent device, including:
and a hole injection transport layer forming step of forming the hole injection transport layer on the anode.
Preferably, the hole injection transport layer forming step specifically includes the steps of:
adding magnetic conductive nano-rods into an organic solvent to form a magnetic solution;
adding a hole transport material into the magnetic solution to form a precursor solution;
uniformly coating the precursor solution on the surface of a substrate serving as the anode;
applying a magnetic field to the substrate to uniformly distribute the magnetic conductive nanorods in the precursor solution;
and carrying out annealing treatment to solidify the precursor solution on the surface of the substrate.
Preferably, the temperature for annealing is 50 to 90 ℃.
Preferably, in the precursor solution, the concentration of the magnetic conductive nanorods is 0.1-1g/ml, and the concentration of the hole transport material is 10-20 g/ml.
Preferably, the precursor solution is uniformly applied to the surface of the substrate serving as the anode by a solution spin coating method or a solution inkjet method.
Preferably, the organic solvent is: benzene, toluene, xylene, pentane, hexane, octane and the like, cyclohexane, cyclohexanone, tolucyclohexanone, chlorobenzene, dichlorobenzene, methylene chloride, methanol, ethanol, isopropanol, diethyl ether, propylene oxide, methyl acetate, ethyl acetate, propyl acetate, acetone, methyl butanone, methyl isobutyl ketone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and the like, acetonitrile, pyridine and/or phenol.
Preferably, the concentration of the magnetic conductive nanorods in the magnetic solution is 0.1-1 g/ml.
Preferably, the hole transport material is: NPB, mCP, TCTA, m-MTDATA.
Preferably, the diameter of the magnetic conductive nanorod is 1-10 nm, and the length of the magnetic conductive nanorod is 10-150 nm.
Preferably, the material of the magnetic conductive nanorod is Fe 3 O 4 、Fe 2 O 3 Fe/Co alloy, Fe/Ni alloy, FeS or single-walled carbon nanotubes.
The beneficial effects of the above technical scheme are:
the hole injection transport layer is used for replacing the existing hole transport layer and the hole injection layer, the magnetic conductive nanorod is arranged in the hole injection transport layer and can guide the hole from the anode direction of the hole injection transport layer to the cathode direction, the leakage current in the common layer (the hole injection transport layer) is eliminated, the color cast is eliminated, and the display effect of the device is improved.
Further features and advantages of the invention, as well as the structure and operation of various embodiments of the invention, are described in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited to the specific embodiments described herein. These examples are given herein for illustrative purposes only.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a conventional OLED device;
FIG. 2 is a schematic diagram of an organic electroluminescent device according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the hole injection transport layer shown in FIG. 2 according to a preferred embodiment of the present invention;
FIG. 4 is a flow chart illustrating a method of fabricating an organic electroluminescent device according to a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of a magnetic field applying method according to a preferred embodiment of the present invention.
List of reference numerals:
100 pixel cell
Light emitting layer of 101 red sub-pixel
102 light emitting layer of blue sub-pixel
103 green sub-pixel
104 hole injection layer
105 hole transport layer
201 cathode
202 electron injection transport layer
203 luminescent layer
204 hole injection transport layer
205 anode
301 base layer
302 magnetic conductive nano rod
303 hole conducting array
501 heating table
The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Throughout the drawings, like reference numerals designate corresponding elements. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
According to one aspect of the present invention, there is provided an organic electroluminescent device.
Fig. 2 shows a schematic structural diagram of an organic electroluminescent device, which includes a cathode 201, an electron injection transport layer 202, an emitting layer 203, a hole injection transport layer 204, and an anode 205, wherein the hole injection transport layer 204 is disposed on the anode 205. In some embodiments, the electron injection transport layer 202 may be replaced with an electron injection layer and an electron transport layer. The material of the anode 205 may be conductive oxide, graphene, or metal, for example, the metal may be a metal with high power function such as Ni, Au, Pt, etc.; the metal oxide may be Indium Tin Oxide (ITO). The cathode 201 may be a metal or metal alloy, such as: ag. Li, Mg, Ca, Al, In, etc., with Al or Ag/Mg alloys being the most commonly used materials.
The organic electroluminescent device includes a plurality of Pixel units (pixels), each of which includes a plurality of Sub-Pixel units (Sub-pixels), typically red, green and blue Sub-Pixel units, and the Sub-Pixel units in each Pixel unit share a hole injection transport layer 204, i.e., the plurality of Pixel units of the Pixel unit are disposed on the hole injection transport layer 204.
Fig. 3 shows a schematic view of the structure of the hole injection transport layer 204 in fig. 2. The hole injection transport layer 204 in fig. 3 includes: a matrix layer 301 formed of a hole transport material, and a plurality of magnetically conductive nanorods 302, wherein the magnetically conductive nanorods 302 are located in the matrix layer 301, i.e., the magnetically conductive nanorods 302 are contained in the matrix layer 301.
The base layer 301 is a film layer formed of a hole transport material, which may be, but is not limited to: NPB, mCP, TCTA, m-MTDATA.
The chemical structure of NPB is:
the chemical structure of mCP is:
the chemical structure of TCTA is:
the chemical structural formula of m-MTDATA is as follows:
referring to fig. 3, the magnetically conductive nanorods 302 are uniformly distributed in the matrix layer 301 among the magnetically conductive nanorods 302, and the magnetically conductive nanorods 302 conduct holes from the anode 205 side of the hole injection transport layer 204 to the cathode 201 side of the hole injection transport layer 204. The magnetically conductive nanorods 302 form a hole conducting array 303 for conducting holes from the anode 205 side of the hole injection transport layer 204 to the cathode 201 side of the hole injection transport layer 204, and a ratio of a thickness of the hole conducting array 303 to a thickness of the matrix layer 301 is 0.95 to 1. Holes are transported by a hole conducting array 303 formed by the magnetically conducting nanorods 302.
The two ends of the magnetic conductive nanorods 302 forming the hole-transporting array are respectively connected or adjacent to the anode 205 side and the cathode 201 side of the matrix layer 301. The magnetically conductive nanorods 302 may be perpendicular to the upper surface (cathode 201 side) or the lower surface (anode 205 side) of the matrix layer 301 or may be disposed at an angle, i.e., inclined, with respect to the upper and lower surfaces. The magnetic conductive nanorods 302 can transmit holes from the anode 205 side to the cathode 201 side, and the spacing between each magnetic nano-conductive rod may be equal, so that the magnetic conductive nano-conductive rods in the matrix layer 301 may be uniformly distributed. The projection height of the magnetic conductive nano-rod in the thickness direction of the substrate layer 301 is H, the thickness of the substrate layer 301 is L, and the ratio of the projection height H of the magnetic conductive nano-rod 302 to the thickness L of the substrate layer 301 is 0.95-1 for the purpose of hole conduction. When the extension direction of the magnetically conductive nanorods 302 is perpendicular to the upper and lower surfaces (as shown in fig. 3), the length of the magnetically conductive nanorods 302 is the projected height H. When the ratio of the projection height H to the thickness L of the matrix layer 301 is 0.95, the hole conduction efficiency of the magnetic conductive nanorods 302 is just enough to prevent the whole device from generating color shift, i.e. leakage current capable of conducting the adjacent sub-pixel units. When the ratio of the projection height H to the thickness L of the substrate layer 301 is less than-0.95, the on-current of a sub-pixel unit will form a leakage current, and the leakage current will cause the color shift of the adjacent sub-pixel units, thereby failing to achieve the effect of correcting or eliminating the color shift.
The diameter of the magnetic conductive nanorod 302 in the matrix layer 301 is 1-10 nm, and the length is 10-150 nm. The diameter of the magnetic conductive nanorod 302 is greater than or equal to 1 nm. When the diameter is less than 1nm, the smaller the conductivity of the magnetic conductive nanorod 302 is, the less the requirement of hole conduction in the present invention can not be satisfied. When the diameter of the magnetic conductive nanorod 302 is too large, i.e., greater than 10nm, the requirement of the manufacturing process cannot be met.
The material of the magnetically conductive nanorods 302 can be, but is not limited to: fe 3 O 4 、Fe 2 O 3 Fe/Co alloy, Fe/Ni alloy, FeS or single-walled carbon nanotubes.
The content of the magnetic conductive nano-rod 302 in the hole injection transport layer 204 is 0.01-1g/cm 3 The content is the ratio of the weight of all the magnetically conductive nanorods 302 in the hole injection transport layer 204 to the volume of the hole injection transport layer 204. When the content range of the magnetic conductive nano-rod 302 is between 0.01 and 1g/cm 3 In the middle, the efficiency of hole transport of the hole injection transport layer 204 can be ensured.
According to one aspect of the present invention, there is provided a method of fabricating an organic electroluminescent device, comprising the steps of S401 adding magnetically conductive nanorods 302 in an organic solvent to form a magnetic solution; step S402, adding a hole transport material into the magnetic solution to form a precursor solution; step S403, uniformly coating the precursor solution on the surface of the substrate serving as the anode 205; step S404, applying a magnetic field to the substrate to uniformly distribute the magnetic conductive nanorods 302 in the precursor solution; step S405, an annealing process is performed to cure the precursor solution on the substrate surface.
Fig. 4 shows a flow diagram of a method for producing an organic electroluminescent device. In step S401, the magnetically conductive nanorods 302 are added in an organic solvent to form a magnetic solution. The organic solvent here may be: aromatic hydrocarbons: benzene, toluene, xylene, etc.; ② aliphatic hydrocarbons: pentane, hexane, octane, and the like; ③ alicyclic hydrocarbons: cyclohexane, cyclohexanone, toluenecyclohexanone, and the like; (iv) halogenated hydrocarbons: chlorobenzene, dichlorobenzene, dichloromethane, and the like; alcohol: methanol, ethanol, isopropanol, etc.; ethers: ethyl ether, propylene oxide, and the like; seventh, esters: methyl acetate, ethyl acetate, propyl acetate, and the like; eighty ketones: acetone, methyl butanone, methyl isobutyl ketone, and the like; ninthly, a diol derivative: ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, and the like; r other: acetonitrile, pyridine, phenol, and the like. The organic solvent may be one of the above organic solvents, or a mixture of any of a plurality of organic solvents. In some embodiments, the concentration of the magnetically conductive nanorods 302 in the magnetic solution is between 0.1 and 1 g/ml.
In step S402, a hole transport material is added to the magnetic solution to form a precursor solution. The precursor solution can be formed by adding a hole transport material to the magnetic solution. After the hole transport material is added to the magnetic solution, stirring is performed for 24 hours, so that the hole transport material, the organic solvent and the magnetic conductive nanorods 302 can be uniformly mixed. Then standing for 1 hour to form a uniform precursor solution, wherein the concentration of the magnetic conductive nanorods in the precursor solution is 0.1-1g/ml, the concentration of the hole transport material is 10-20g/ml, and the concentration of a mixed solute formed by the hole transport material and the magnetic conductive nanorods is 10-20 g/ml. The hole transport material may be, but is not limited to: NPB, mCP, TCTA, m-MTDATA, etc.
In step S403, the precursor solution is uniformly applied to the surface of the substrate serving as the anode 205. The precursor solution is uniformly applied to the surface of a substrate (ITO substrate) serving as the anode 205 by a solution spin coating method or a solution inkjet method. The solution spin coating method is that precursor solution is dripped on an ITO substrate, and then the ITO substrate is rotated to enable the precursor solution to be uniformly distributed on the ITO substrate. The solution ink-jet method is to uniformly spray the precursor solution on the ITO substrate in a manner similar to ink-jet printing.
Fig. 5 shows a schematic diagram of a magnetic field application. In step S404, a magnetic field is applied to the substrate to uniformly distribute the magnetically conductive nanorods 302 in the precursor solution. After a thin film serving as the hole injection transport layer 204 is uniformly provided on the surface of the substrate (anode 205), a uniform vertical magnetic field is applied to the thin film region. Under the action of the uniform magnetic field, the magnetic conductive nanorods 302 in the thin film are all arranged along the direction of the uniform magnetic field. In other embodiments, the direction of the uniform magnetic field may not be perpendicular to the ITO substrate.
In step S405, an annealing process is performed to cure the precursor solution on the substrate surface. Referring to fig. 5, the substrate (anode 205) is subjected to a low temperature annealing treatment, i.e., the anode 205 is heated by the heating stage 501, so that the organic liquid in the precursor solution is volatilized, and finally a mixed thin film of the hole transport material and the magnetically conductive nanorods 302 (i.e., the hole injection transport layer 204) is formed, and the thickness of the mixed thin film is 10-150 nm. In the preferred embodiment, the hole injection transport layer 204(HITL) is formed such that the magnetically conductive nanorods 302 are aligned at an angle perpendicular to the substrate under the influence of a magnetic field to form a columnar structure. Thus the lateral conductivity of HITL is very low due to the hole transporting material separation between magnetic nanorods. The longitudinal direction is directly conducted through the magnetic conductive nano-rods 302, and the conductivity is extremely high. The HITL film with high longitudinal conductivity and low transverse conductivity is formed. Finally, holes can be transmitted along the longitudinal direction, transverse current crosstalk disappears, the low-gray-scale color cast phenomenon of the OLED panel is weakened, and the performance is improved. The doping ratio of the magnetic conductive nanorods 302 in the hole injection transport layer 204 can also be increased, so that the panel driving voltage is reduced and the lifetime is prolonged.
In conclusion, the hole injection transport layer replaces the existing hole transport layer and hole injection layer, the magnetic conductive nanorod is arranged in the hole injection transport layer, and the magnetic conductive nanorod can guide holes from the anode direction to the cathode direction of the hole injection transport layer, so that the leakage current in the common layer (the hole injection transport layer) is eliminated, the color cast is eliminated, and the display effect of the device is improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.
Claims (16)
1. An organic electroluminescent device comprising at least one hole injection transport layer, said hole injection transport layer comprising:
a base layer formed of a hole transport material;
the magnetic conductive nanorods are uniformly distributed in the matrix layer to form a hole conduction array, and are used for conducting holes from the anode side of the hole injection transport layer to the cathode side of the hole injection transport layer, and the ratio of the thickness of the hole conduction array to the thickness of the matrix layer is 0.95-1;
the magnetic conductive nano-rods are vertically or obliquely arranged in the matrix layer; the ratio of the projection length of the magnetic conductive nano rod in the thickness direction of the matrix layer to the thickness of the matrix layer is 0.95-1.
2. The organic electroluminescent device according to claim 1, wherein the hole transport material is: NPB, mCP, TCTA, m-MTDATA.
3. The organic electroluminescent device as claimed in claim 1, wherein the magnetic conductive nanorods have a diameter of 1-10 nm and a length of 10-150 nm.
4. The organic electroluminescent device as claimed in claim 1, wherein the material of the magnetically conductive nanorods is Fe 3 O 4 、Fe 2 O 3 Fe/Co alloy, Fe/Ni alloy, FeS or single-layer carbon nanotube.
5. The organic electroluminescent device of claim 1, wherein the content of the magnetic conductive nanorods in the hole injection transport layer is 0.01-1g/cm 3 。
6. The organic electroluminescent device of claim 1, wherein the extension direction of the magnetic conductive nanorods is perpendicular to both the upper and lower surfaces of the matrix layer.
7. A method of manufacturing an organic electroluminescent device, comprising:
a hole injection transport layer forming step of forming a hole injection transport layer as claimed in claim 1 over the anode.
8. The manufacturing method according to claim 7, wherein the hole injection transport layer forming process specifically includes the steps of:
adding magnetic conductive nano-rods into an organic solvent to form a magnetic solution;
adding a hole transport material into the magnetic solution to form a precursor solution;
uniformly coating the precursor solution on the surface of a substrate serving as the anode;
applying a magnetic field to the substrate to uniformly distribute the magnetic conductive nanorods in the precursor solution;
and carrying out annealing treatment to solidify the precursor solution on the surface of the substrate.
9. The method according to claim 8, wherein the annealing is performed at a temperature of 50 to 90 ℃.
10. The method of claim 8, wherein the concentration of the magnetic conductive nanorods in the precursor solution is 0.1-1g/ml, and the concentration of the hole transport material is 10-20 g/ml.
11. The manufacturing method according to claim 8, characterized in that the precursor solution is uniformly applied to the surface of the substrate as the anode by a solution spin coating method or a solution inkjet method.
12. The production method according to claim 8, wherein the organic solvent is: benzene, toluene, xylene, pentane, hexane, octane, cyclohexane, cyclohexanone, toluene cyclohexanone, chlorobenzene, dichlorobenzene, dichloromethane, methanol, ethanol, isopropanol, diethyl ether, propylene oxide, methyl acetate, ethyl acetate, propyl acetate, acetone, methyl butanone, methyl isobutyl ketone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, acetonitrile, pyridine and/or phenol.
13. The method of claim 8, wherein the concentration of the magnetically conductive nanorods in the magnetic solution is 0.1-1 g/ml.
14. The manufacturing method according to claim 8, wherein the hole transport material is: NPB, mCP, TCTA, m-MTDATA.
15. The method according to claim 8, wherein the magnetically conductive nanorods have a diameter of 1 to 10nm and a length of 10 to 150 nm.
16. The method according to claim 8, wherein the material of the magnetic conductive nanorods is Fe 3 O 4 、Fe 2 O 3 Fe/Co alloy, Fe/Ni alloy, FeS or single-layer carbon nanotube.
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