CN111864097A - Organic electroluminescent device and display device thereof - Google Patents
Organic electroluminescent device and display device thereof Download PDFInfo
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Abstract
The invention discloses an organic electroluminescent device, which is selected from a substrate and an organic light-emitting unit arranged on the substrate, wherein the organic light-emitting unit is selected from a first electrode, a hole transmission region, a light-emitting layer, an n-layer middle doping layer, an electron transmission region and a second electrode which are sequentially stacked; wherein n is more than or equal to 2, and the hole transport region is selected from one or more of a hole injection layer, a hole transport layer and an electron blocking layer; the electron transport region is selected from one or more of an electron injection layer, an electron transport layer and a hole blocking layer. The invention provides an organic electroluminescent device, which can effectively improve the luminous efficiency of an organic luminous unit, further improve the service life of the organic luminous unit and prolong the service life of an OLED display panel by improving the electron injection capability, increasing an exciton recombination region and avoiding the formation of leakage current through a specific laminated structure and arranging an intermediate doping layer between a luminous layer and an electron transmission layer.
Description
Technical Field
The invention relates to the technical field of organic electroluminescent devices, in particular to an organic electroluminescent device and a display device thereof.
Background
An Organic Light Emitting Diode (OLED) display panel is a self-luminous display panel, and the OLED display panel is increasingly applied to various high-performance display fields due to its advantages of lightness, thinness, high brightness, low power consumption, wide viewing angle, high response speed, and wide temperature range.
At present, with the development of OLED materials, organic materials meeting the performance requirements of OLED display panels are biased to be of an electron transmission type, the electron injection materials have no obvious influence on the service life at normal temperature, but the electron injection speed is slower relative to the electron migration speed at high temperature, so that the accumulation of electrons on a cathode is caused, the electronic materials are easy to age, and the service life of the OLED display panels is shortened. Since the Liq concentration has no obvious influence on the normal temperature life of the device, but has a large influence on the high temperature life, that is, when the concentration is low, the life is short, it is presumed that the electron injection is a key factor influencing the short high temperature life.
Therefore, how to provide an organic electroluminescent device capable of solving the problem that the blue lifetime is short at high temperature is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides an organic electroluminescent device, which has a specific stacked structure, and an intermediate doping layer is disposed between a light emitting layer and an electron transport layer, so as to increase an exciton recombination region and avoid the formation of leakage current by improving an electron injection capability, effectively improve a light emitting efficiency of an organic light emitting unit, further improve a lifetime of the organic light emitting unit, and increase a lifetime of an OLED display panel.
In order to achieve the purpose, the invention adopts the following technical scheme:
an organic electroluminescent device comprises a substrate and an organic light-emitting unit arranged on the substrate, wherein the organic light-emitting unit comprises a first electrode, a hole transmission region, an n-layer middle doped layer, an electron transmission region and a second electrode which are sequentially stacked;
wherein n is more than or equal to 2, and the hole transport region comprises one or more of a hole injection layer, a hole transport layer and an electron blocking layer;
the electron transport region comprises one or more of an electron injection layer, an electron transport layer and a hole blocking layer.
The technical effect of adopting the technical scheme is as follows: the organic electroluminescent device obtained by the specific laminated structure is long in service life because the hole transport region is arranged between the first electrode and the luminescent layer and the electron transport region is arranged between the second electrode and the luminescent layer.
Preferably, the overall thickness of the middle doped layer is 10-30 nm;
preferably, the doping material in the intermediate doping layer is a mixture of a host material and an electron transport material.
Preferably, the volume ratio of the host material to the electron transport material is (40-60): (60-40).
The technical scheme has the following effects: the middle doping layer and the light emitting layer are made of the same light emitting main body material, so that the energy level difference between the middle doping layer and the light emitting layer is small, the middle doping layer can be used as an energy level transition layer between the cathode and the light emitting layer, the electron injection capacity is improved, the exciton recombination zone can be increased by the middle doping layer, the phenomenon that the exciton recombination zone deviates from the anode to damage the first charge transmission layer is avoided, the service life of the organic light emitting unit is prolonged, and the service life of the OLED display panel is prolonged.
Preferably, the volume percentage of the host material in the middle doped layer of the first layer is 40-60%, and the volume percentage of the electron transport material in the middle doped layer of the second layer is 60-40%.
Preferably, the host material is selected from one of carbazole group-based derivatives, aryl silicon derivatives, aromatic derivatives, and metal complexes.
Preferably, the aromatic derivative is selected from one of the compounds having the formula EMH1-EMH 8;
preferably, the electron transport material is selected from one of Al complex of 8-hydroxyquinoline, complex containing Alq3, organic radical compound, hydroxyflavone-metal complex, heterocyclic compound containing electron-withdrawing group, phosphorus oxy compound, and boron-containing compound.
Preferably, the electron transport material is selected from one of compounds shown in a formula ETL1-ETL 8;
preferably, the light-emitting material in the light-emitting layer includes the host material and a dopant material, and a volume ratio of the host material to the dopant material is (90-99.5): (0.5-10);
the doping material is selected from one of aromatic hydrocarbon compounds, arylamine compounds, organic boron derivatives, silicon derivatives, carbazole derivatives and metal complexes.
Preferably, the phosphorescent material is selected from metal complex derivatives; the phosphorescent dopant material is selected from metal complexes.
Preferably, the aromatic derivative is one selected from anthracene derivatives, pyrene derivatives, naphthalene derivatives, phenanthrene derivatives and fluorene derivatives, and the metal complex is an iridium metal complex.
Preferably, the arylamine compound is selected from one of compounds shown in formulas EMD1, EMD3, EMD4, EMD5, EMD7 and EMD 8;
the aromatic hydrocarbon compound is selected from one of compounds shown as formulas EMD2 and EMD 6;
preferably, the electron transport material in the electron transport layer is selected from one of an Al complex of 8-hydroxyquinoline, a complex containing Alq3, an organic radical compound, a hydroxyflavone-metal complex, a heterocyclic compound containing an electron-withdrawing group, a phosphorus oxy compound, and a boron-containing compound. Further, the heterocyclic compound containing an electron-withdrawing group is selected from one of phenanthroline, imidazole, pyridine, triazole, triazine and quinoline.
The technical effect of adopting the technical scheme is as follows: the electron transport material has high electron mobility, can promote the electron transport function, and is favorable for receiving electrons from the cathode and transporting the electrons to the light emitting layer.
Preferably, the hole blocking layer material in the hole blocking layer is selected from one of phenanthroline derivative metal complexes, metal complexes of hydroxyquinoline derivatives, rare earth complexes, oxazole derivatives, triazole derivatives and triazine derivatives; further, the phenanthroline derivative metal complex is Bathocuproine (BCP), and the hydroxyquinoline derivative metal complex is aluminum (III) bis (2-methyl-8-quinoline) -4-phenylphenate (BAlq);
the technical effect of adopting the technical scheme is as follows: the hole blocking material can block holes injected from the anode from passing through the light emitting layer to enter the cathode, thereby prolonging the service life of the organic electroluminescent device and improving the efficiency of the organic electroluminescent device.
Preferably, the electron injection material in the electron injection layer is selected from one of fluorenone and its derivatives, anthraquinone dimethane and its derivatives, diphenoquinone and its derivatives, thiopyran dioxide and its derivatives, oxazole and its derivatives, oxadiazole and its derivatives, triazole and its derivatives, imidazole and its derivatives, perylene tetracarboxylic acid and its derivatives, fluorenylidene methane and its derivatives, anthrone and its derivatives, and metal complexes.
The technical effect of adopting the technical scheme is as follows: the electron injection material is capable of promoting an electron injection effect, has an ability to transport electrons, has an electron injection effect from a cathode, has an excellent electron injection effect on the light emitting layer or the light emitting material, prevents excitons generated in the light emitting layer from migrating to the hole injection layer, and has an excellent thin film forming ability.
Preferably, the hole injection material in the hole injection layer is selected from one of metalloporphyrin, oligothiophene, arylamine-based organic material, hexanitrile-hexaazatriphenylene-based organic material, quinacridone-based organic material, perylene-based organic material, anthraquinone, polyaniline-based conductive polymer, and polythiophene-based conductive polymer; may further comprise additional compounds capable of p-doping;
the hole transport material in the hole transport layer is selected from one of arylamine-based organic materials, conductive polymers, and block copolymers having conjugated portions and non-conjugated portions;
the electron blocking material in the electron blocking layer is selected from one of arylamine-based organic materials, conductive polymers, and block copolymers having conjugated portions and non-conjugated portions.
The technical effect of adopting the technical scheme is as follows: the hole injecting material is a material that favors the reception of holes from the anode at low voltages, and the Highest Occupied Molecular Orbital (HOMO) of the hole injecting material is between the work function of the anode material and the HOMO of the surrounding organic material layer. The hole transport material has high hole mobility, and is capable of receiving holes from the anode or the hole injection layer and transporting the holes to the light emitting layer.
Preferably, the arylamine-based organic material in the hole injection material is selected from one of compounds having the formula HIL1-HIL 8;
the arylamine based organic material in the hole transport material is selected from one of compounds having the formula HTL1-HTL 8;
the arylamine based organic material in the electron blocking material is selected from one of compounds having a formula of EBL1-EBL 8;
preferably, the anode material in the first electrode layer is selected from one or a combination of two of a metal and a metal oxide;
the metal is selected from one or more of vanadium, chromium, copper, zinc and gold;
the metal oxide is selected from one of zinc oxide, indium tin oxide and indium zinc oxide;
the conductive polymer is selected from one of poly (3-methylthiophene), poly [3, 4- (ethylene-1, 2-dioxy) thiophene ], polypyrrole and polyaniline.
The technical effect of adopting the technical scheme is as follows: the hole is smoothly injected into the organic material layer by selecting a material with a large work function.
Preferably, the cathode material in the second electrode layer is selected from metals and multilayer structure materials;
the metal is selected from one or more of magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin and lead;
the multilayer structure material is selected from LiF/Al and LiO2One of Al.
The technical effect of adopting the technical scheme is as follows: the material having a small work function allows electrons to be smoothly injected into the organic material layer.
Preferably, the organic light emitting device is one of a top emission type, a bottom emission type, and a double-side emission type.
The invention also provides a display device which comprises the organic electroluminescent device.
Compared with the prior art, the organic electroluminescent device and the display device thereof have the following technical effects: the middle doping layer is arranged between the light emitting layer and the electron transmission layer, the middle doping layer and the light emitting layer are made of the same light emitting main body material, so that the energy level difference between the middle doping layer and the light emitting layer is smaller, the middle doping layer can be used as an energy level transition layer between the cathode and the light emitting layer, the electron injection capability is improved, the middle doping layer can be arranged to increase an exciton recombination zone, the phenomenon that the exciton recombination zone deflects to the anode to damage the first charge transmission layer is avoided, the service life of the organic light emitting unit is prolonged, and the service life of the OLED display panel is prolonged. By improving the electron injection capability, increasing the exciton recombination zone and avoiding the formation of leakage current, the luminous efficiency of the organic light-emitting unit can be effectively improved, the service life of the organic light-emitting unit is further prolonged, and the service life of the OLED display panel is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an organic electroluminescent device provided in this embodiment.
Wherein 1 is a substrate, 2 is a first electrode layer, 3 is a hole transport region, 31 is a hole injection layer, 32 is a hole transport layer, 33 is an electron blocking layer, 4 is a light emitting layer, 5 is an intermediate doping layer, 6 is an electron transport region, 61 is a hole blocking layer, 62 is an electron transport layer, 63 is an electron injection layer, and 7 is a second electrode layer.
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 embodiment of the invention discloses an organic electroluminescent device, the structure of which is shown in figure 1, and the organic electroluminescent device comprises a substrate 1 and an organic light-emitting unit arranged on the substrate 1, wherein the organic light-emitting unit comprises a first electrode layer 2, a hole transmission region 3, a light-emitting layer 4, an n-layer middle doped layer 5, an electron transmission region 6 and a second electrode layer 7 which are sequentially stacked;
wherein n is more than or equal to 2, and the hole transport region 3 comprises one or more of a hole injection layer 31, a hole transport layer 32 and an electron blocking layer 33;
the electron transport region 6 includes one or more of an electron injection layer 63, an electron transport layer 62, and a hole blocking layer 61.
In order to optimize the above technical solution, the anode material in the first electrode layer 1 is selected from one or a combination of two of metal and metal oxide;
the metal is selected from one or more of vanadium, chromium, copper, zinc and gold;
the metal oxide is selected from one of zinc oxide, indium tin oxide and indium zinc oxide;
also comprises a conductive polymer, wherein the conductive polymer is selected from one of poly (3-methylthiophene), poly [3, 4- (ethylene-1, 2-dioxy) thiophene ], polypyrrole and polyaniline.
According to the technical scheme, the material with the large work function is selected to enable the holes to be smoothly injected into the organic material layer.
In order to optimize the above technical solution, the hole injection material in the hole injection layer 31 is selected from one of metalloporphyrin, oligothiophene, arylamine-based organic material, hexanenitrile-based hexaazatriphenylene-based organic material, quinacridone-based organic material, perylene-based organic material, anthraquinone, polyaniline-based conductive polymer, and polythiophene-based conductive polymer. Preferably, the arylamine-based organic material is selected from one of compounds having the formula HIL1-HIL 8. The above-described solution is advantageous for materials that receive holes from the anode at low voltages, and the Highest Occupied Molecular Orbital (HOMO) of the hole injection material is between the work function of the anode material and the HOMO of the surrounding organic material layer.
In order to optimize the technical solution, the hole transport material in the hole transport layer 32 is selected from one of arylamine-based organic materials, conductive polymers, and block copolymers having conjugated portions and non-conjugated portions. It may be preferable that the arylamine-based organic material is selected from one of compounds having the formula HTL1-HTL 8. The technical scheme has high hole mobility, and can receive holes from the anode or the hole injection layer and transmit the holes to the light-emitting layer.
In order to optimize the technical solution, the electron blocking material in the electron blocking layer 33 is selected from one of arylamine-based organic materials, conductive polymers, and block copolymers having conjugated portions and non-conjugated portions. Preferably, the arylamine-based organic material is selected from one of the compounds having the formula EBL1-EBL 8.
In order to optimize the technical solution, the luminescent material in the luminescent layer 4 comprises a host material and a dopant material, and the volume ratio of the host material to the dopant material is (90-99.5): (0.5-10). The host material is selected from one of a phosphorescent material, a fluorescent material and a delayed fluorescent material. Preferably, the host material is selected from one of carbazole group-based derivatives, aryl silicon derivatives, aromatic derivatives, and metal complex derivatives; preferably, the aromatic derivative is one selected from the group consisting of anthracene derivatives, pyrene derivatives, naphthalene derivatives, phenanthrene derivatives, and fluorene derivatives. Preferably, the anthracene derivative is selected from one of compounds having a formula of EMH1-EMH 8.
The doping material is selected from one of a fluorescent doping material and a phosphorescent doping material. Preferably, the fluorescent doping material is selected from one of aromatic hydrocarbon compounds, aromatic amine compounds, organic boron derivatives, silicon derivatives and carbazole derivatives; the phosphorescent dopant material is selected from metal complexes. Preferably, the aromatic amine compound is one selected from compounds having the formula of EMD1, EMD3, EMD4, EMD5, EMD7, EMD 8; the aromatic hydrocarbon compound is selected from one of compounds shown in formulas EMD2 and EMD 6.
In order to optimize the technical scheme, at least two intermediate doping layers 5 are arranged between the light emitting layer 4 and the electron transport layer 62, and each intermediate doping layer 5 comprises a main body material and an electron transport material; the thickness of the middle doped layer 5 is 10-30 nm; the volume ratio of the main body material in the middle doped layer 5 positioned in the first layer is 40-60%; the volume of the electron transport material in the intermediate doped layer 5 of the second layer is 40-60%.
In order to optimize the technical solution, the electron transport material in the electron transport layer 62 is selected from one of an Al complex of 8-hydroxyquinoline, a complex containing Alq3, an organic radical compound, a hydroxyflavone-metal complex, a heterocyclic compound containing an electron-withdrawing group, a phosphorus oxy compound, and a boron-containing compound. Preferably, the heterocyclic compound containing an electron-withdrawing group is one selected from phenanthroline, imidazole, pyridine, triazole, triazine and quinoline. Preferably, the electron transport material is selected from one of compounds having the formula ETL1-ETL 8. The technical scheme has high electron mobility, can promote the electron transmission effect, and is favorable for receiving electrons from the cathode and transmitting the electrons to the light-emitting layer.
In order to optimize the technical solution, the hole blocking layer material in the hole blocking layer 61 is selected from one of phenanthroline derivative metal complexes, metal complexes of hydroxyquinoline derivatives, rare earth complexes, oxazole derivatives, triazole derivatives, and triazine derivatives. The technical scheme can prevent the holes injected from the anode from passing through the light-emitting layer and entering the cathode, thereby prolonging the service life of the organic electroluminescent device and improving the efficiency of the organic electroluminescent device.
In order to optimize the technical solution, the electron injection material in the electron injection layer 62 is selected from one of fluorenone and its derivatives, anthraquinone dimethane and its derivatives, diphenoquinone and its derivatives, thiopyran dioxide and its derivatives, oxazole and its derivatives, oxadiazole and its derivatives, triazole and its derivatives, imidazole and its derivatives, perylene tetracarboxylic acid and its derivatives, fluorenylidene methane and its derivatives, anthrone and its derivatives, metal complexes, and nitrogen-containing five-membered ring derivatives. The technical scheme can promote the function of electron injection, has the capability of transporting electrons, has the effect of injecting electrons from the cathode, has excellent electron injection effect on the light-emitting layer or the light-emitting material, prevents excitons generated in the light-emitting layer from transferring to the hole injection layer, and has excellent film forming capability.
In order to optimize the solution, the cathode material in the second electrode layer 7 is selected from metals and multi-layer structure materials; the metal is selected from one or more of magnesium, calcium, sodium, potassium, titanium, indium, yttrium, lithium, gadolinium, aluminum, silver, tin and lead; the material of the multilayer structure is selected from LiF/Al and LiO2One of Al. The material with the small work function in the technical scheme enables electrons to be smoothly injected into the organic material layer.
In order to optimize the technical solution, the organic light emitting device is one of a top emission type, a bottom emission type, and a double-side emission type.
The structures of the compounds employed in the examples of the invention are shown below:
example 1
The embodiment discloses an organic electroluminescent device, which comprises a substrate and an organic light-emitting unit arranged on the substrate, wherein the organic light-emitting unit comprises a first electrode layer, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a first middle doping layer, a second middle doping layer, an electron transport layer, an electron injection layer and a second electrode layer which are sequentially stacked, and the preparation method comprises the following steps:
a) transparent glass with ITO on the surface was used as a substrate, and then ultrasonically cleaned with deionized water, acetone, and ethanol for 15 minutes, respectively, and then treated in a plasma cleaner for 2 minutes.
b) The hole injection material HIL1 was prepared as a hole injection layer on the washed first electrode layer by vacuum evaporation to a thickness of 10 nm.
c) On the hole injection layer, a hole transport material HTL1 was prepared by vacuum evaporation to a thickness of 90nm, which was a hole transport layer.
d) On the hole transport layer, an electron blocking material EBL1 was prepared by vacuum evaporation to a thickness of 20nm, which was an electron blocking layer.
e) And preparing a light-emitting layer material on the electron blocking layer by vacuum evaporation, wherein the main material is EMH1, the doping material is EMD1, the volume ratio is 90:10, and the thickness is 40 nm.
f) Evaporating a main material EMH2 and an electron transport layer material ETL2 on the light-emitting layer in a vacuum evaporation mode, wherein the volume ratio is 50:50 as a first intermediate doped layer; evaporating a main body material EMH3 and an electron transport layer material ETL3 with the volume ratio of 50:50 to serve as a second intermediate doping layer, wherein the overall thickness is 10 nm; and evaporating ETL1 and Liq (8-hydroxyquinoline lithium) by a vacuum evaporation mode, wherein the volume ratio is 50:50, the thickness is 40nm, and the layer is an electron transport layer.
g) And evaporating LiF on the electron transport layer in a vacuum evaporation mode, wherein the thickness of the LiF is 1.5nm, and the layer is an electron injection layer.
h) And evaporating AL on the electron injection layer by a vacuum evaporation mode, wherein the thickness of the AL is 100nm, and the layer is a second electrode layer.
Example 2
The embodiment discloses an organic electroluminescent device, which comprises a substrate and an organic light-emitting unit arranged on the substrate, wherein the organic light-emitting unit comprises a substrate, a first electrode layer, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a first intermediate doping layer, a second intermediate doping layer, an electron transport layer, an electron injection layer and a second electrode layer which are sequentially stacked, the preparation method of the organic light-emitting unit is carried out according to the process of the embodiment 1, the difference is that in the step f), a main material EMH4 and an electron transport layer material ETL4 are evaporated on the light-emitting layer in a vacuum evaporation mode, and the volume ratio is 60:40 as a first intermediate doped layer; evaporating a main material EMH5 and an electron transport layer material ETL5, wherein the volume ratio is 40:60 as a second intermediate doped layer with an overall thickness of 20 nm; and evaporating ETL1 and Liq by a vacuum evaporation mode, wherein the volume ratio is 50:50, the thickness is 40nm, and the layer is an electron transport layer.
Example 3
The embodiment discloses an organic electroluminescent device, which comprises a substrate and an organic light-emitting unit arranged on the substrate, wherein the organic light-emitting unit comprises a substrate, a first electrode layer, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a first intermediate doping layer, a second intermediate doping layer, a third intermediate doping layer, an electron transport layer, an electron injection layer and a second electrode layer which are sequentially stacked, the preparation method of the organic light-emitting unit is carried out according to the process of the embodiment 1, and the difference is that in the step f), a main body material EMH6 and an electron transport layer material ETL6 are evaporated on the light-emitting layer in a vacuum evaporation mode to form the first intermediate doping layer; evaporating a main body material EMH6 and an intermediate doping layer of an electron transport layer material ETL7 to form a second layer in a vacuum evaporation mode; evaporating a main body material EMH8 and an electron transport layer material ETL8, wherein a middle doped layer is a third layer in a vacuum evaporation mode, the volume ratio is 60:40, 50:50 and 40:60 in sequence, and the overall thickness is 30 nm; and evaporating ETL1 and Liq by a vacuum evaporation mode, wherein the volume ratio is 50:50, the thickness is 40nm, and the layer is an electron transport layer.
Comparative example 1
The embodiment discloses an organic electroluminescent device, which comprises a substrate and an organic light-emitting unit arranged on the substrate, wherein the organic light-emitting unit comprises a first electrode layer, a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, an electron transport layer, an electron injection layer and a second electrode layer which are sequentially stacked, and the preparation method comprises the following steps:
a) transparent glass with ITO on the surface was used as a substrate, and then ultrasonically cleaned with deionized water, acetone, and ethanol for 15 minutes, respectively, and then treated in a plasma cleaner for 2 minutes.
b) The hole injection material HIL1 was prepared as a hole injection layer on the washed first electrode layer by vacuum evaporation to a thickness of 10 nm.
c) On the hole injection layer, a hole transport material HTL1 was prepared by vacuum evaporation to a thickness of 90nm, which was a hole transport layer.
d) On the hole transport layer, an electron blocking material EBL1 was prepared by vacuum evaporation to a thickness of 20nm, which was an electron blocking layer.
e) And preparing a light-emitting layer material on the electron blocking layer by vacuum evaporation, wherein the main material is EMH1, the doping material is EMD1, the volume ratio is 90:10, and the thickness is 40 nm.
f) ETL1 and Liq were deposited on the light-emitting layer by vacuum deposition at a volume ratio of 50:50 and a thickness of 40nm, and the layer was an electron-transporting layer.
g) And evaporating LiF on the electron transport layer in a vacuum evaporation mode, wherein the thickness of the LiF is 1.5nm, and the layer is an electron injection layer.
h) And evaporating AL on the electron injection layer by a vacuum evaporation mode, wherein the thickness of the AL is 100nm, and the layer is a second electrode layer.
The organic electroluminescent devices of examples 1 to 3 and comparative example 1 were tested for light emitting properties.
The test method comprises the following steps: a KEITHLEY 2400 type source measuring unit and a CS-2000 spectral radiance meter are adopted to evaluate the driving voltage, the luminance, the luminous efficiency and the current efficiency, and the test results are shown in Table 1.
Table 1 test results of luminescence properties of organic electroluminescent devices of examples 1 to 3 and comparative example 1
Wherein LT95 refers to a current density of 10mA/cm2In this case, the luminance of the device decayed to 95% of the time taken.
As is clear from the data in Table 1, the current density was 10mA/cm as compared with that of comparative example 12Next, LT95 of examples 1 to 3 were extended by 100 hours, 110 hours, and 160 hours, respectively, and the current efficiencies of examples 1 to 3 were significantly higher than that of comparative example 1, and it was found that the organic electroluminescent device disclosed in the present invention can improve the blue lifetime.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An organic electroluminescent device comprises a substrate and an organic light-emitting unit arranged on the substrate, and is characterized in that the organic light-emitting unit comprises a first electrode, a hole transmission region, an n-layer middle doping layer, an electron transmission region and a second electrode which are sequentially stacked;
wherein n is more than or equal to 2, and the hole transport region comprises one or more of a hole injection layer, a hole transport layer and an electron blocking layer;
the electron transport region comprises one or more of an electron injection layer, an electron transport layer and a hole blocking layer.
2. The device according to claim 1, wherein the entire thickness of the intermediate doped layer is 10-30 nm.
3. The device of claim 1, wherein the dopant material in the intermediate doped layer is a mixture of a host material and an electron transport material.
4. An organic electroluminescent device according to claim 3, wherein the volume ratio of the host material to the electron transport material is (40-60): (60-40).
5. An organic electroluminescent device according to claim 3, wherein the host material is selected from one of carbazole group-based derivatives, aryl silicon derivatives, aromatic derivatives and metal complexes.
6. An organic electroluminescent device according to claim 5, wherein the aromatic derivative is selected from one of compounds having the formula EMH1-EMH 8;
7. the organic electroluminescent device according to claim 3, wherein the electron transport material is selected from one of Al complex of 8-hydroxyquinoline, complex comprising Alq3, organic radical compound, hydroxyflavone-metal complex, heterocyclic compound containing electron-withdrawing group, phosphorus oxy compound and boron-containing compound.
8. An organic electroluminescent device according to claim 3, wherein the light-emitting material in the light-emitting layer comprises the host material and a dopant material, and the volume ratio of the host material to the dopant material is (90-99.5): (0.5-10).
9. A display device characterized in that the display device comprises the organic electroluminescent device according to any one of claims 1 to 8.
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