CN111048675A - Display panel and display device - Google Patents
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
- H10K30/80—Constructional details
- H10K30/865—Intermediate layers comprising a mixture of materials of the adjoining active layers
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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]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
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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
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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
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/18—Carrier blocking layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/40—Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
Abstract
The invention discloses a display panel, which comprises a substrate and a plurality of organic light-emitting units arranged on the substrate, wherein each organic light-emitting unit comprises an anode layer, a hole injection layer, a hole transport layer, an electron blocking layer, an organic light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer and a cathode layer which are arranged in a stacked mode; a first composite layer is arranged between the organic light-emitting layer and the electron blocking layer, and comprises a main body light-emitting material and an electron blocking material; and/or a second composite layer is arranged between the organic light-emitting layer and the hole blocking layer, and comprises a main body light-emitting material and a hole blocking material. The scheme of the invention improves the injection and transmission of electrons/holes in the panel, is beneficial to improving the balance of carriers, increases a recombination region and further prolongs the service life of a device.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a display panel and a display device.
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.
With the increasing demand of high brightness and long lifetime of products, the efficiency and lifetime of OLED devices are further improved. Factors affecting the lifetime, in addition to the stability of the material itself, device structural factors such as the balance of carriers also play a crucial role.
Disclosure of Invention
The invention provides a display panel and a display device, which improve the injection and transmission of electrons/holes in the panel, are beneficial to improving the balance of carriers, increase a recombination region and further prolong the service life of devices.
In a first aspect, an embodiment of the present invention provides a display panel, including: the organic light-emitting diode comprises a substrate and a plurality of organic light-emitting units arranged on the substrate, and is characterized in that the organic light-emitting units comprise an anode layer, a hole injection layer, a hole transport layer, an electron blocking layer, an organic light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer and a cathode layer which are arranged in a stacked mode; a first composite layer is arranged between the organic light-emitting layer and the electron blocking layer, and comprises a main body light-emitting material and an electron blocking material; and/or the presence of a gas in the gas,
and a second composite layer is arranged between the organic light-emitting layer and the hole blocking layer and comprises a main body light-emitting material and a hole blocking material.
Optionally, the mixing ratio of the host luminescent material and the electron blocking material of the first composite layer is 1: 1; and/or the mixing ratio of the main luminescent material and the hole blocking material of the second composite layer is 1: 1.
optionally, a third composite layer is disposed between the hole transport layer and the electron blocking layer, and the third composite layer includes a hole transport material and an electron blocking material.
Optionally, the mixing ratio of the hole transport material and the electron blocking material of the third composite layer is 1: 1.
optionally, a third composite layer is disposed between the hole transport layer and the electron blocking layer, and the third composite layer includes a P-type doped hole transport material or a P-type doped electron blocking material.
Optionally, the thicknesses of the first composite layer, the second composite layer and the third composite layer are all 0.1nm-20 nm.
Optionally, the organic light emitting layer includes a matrix unit and a doping unit, which are stacked, the doping unit is sandwiched between the two matrix units, the doping unit is doped with a host light emitting material and a light emitting guest material, and the light emitting guest material includes an organic dye, a fluorescent material, or a phosphorescent material.
Optionally, the electron blocking material in the composite layer comprises at least one of 4,4 '-cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ] and 4,4', 4 ″ -tris (carbazol-9-yl) triphenylamine.
Optionally, the organic light emitting unit further comprises a blue organic light emitting unit, a red organic light emitting unit and a green organic light emitting unit.
In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes the display panel according to any embodiment of the present invention.
According to the embodiment of the invention, the first composite layer is arranged between the organic light-emitting layer and the electron blocking layer, and the first composite layer further comprises a first functional layer which comprises a hole injection layer, a hole transport layer and an electron blocking layer which are arranged in a stacked mode. Because the first composite layer and the organic light-emitting layer have the same main body light-emitting material, the HOMO energy level difference between the first composite layer and the organic light-emitting layer is smaller, and the first composite layer can be used as an energy level transition layer between the anode and the organic light-emitting layer, so that the hole injection capability is improved; and set up first composite bed and can increase exciton recombination zone, avoid exciton recombination zone deviation positive pole and cause the destruction to first functional layer, electron barrier material in the first composite bed can play the effect of blockking electron flow direction first functional layer in addition to realize better anti electron nature, can effectively avoid unnecessary electron to form leakage current and destroy first functional layer, thereby increase organic light emitting unit's life-span, increase OLED display panel's life-span. In addition, by improving the hole 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.
Similarly, through setting up the second composite layer between organic light emitting layer and hole barrier layer, because the second composite layer has the same main part luminescent material with organic light emitting layer, make the LUMO energy level difference between second composite layer and the organic light emitting layer less, the second composite layer can regard as the energy level transition layer between cathode layer and the organic light emitting layer, improve electron injection ability, and set up the second composite layer and can increase exciton recombination district, avoid exciton recombination district deviation negative pole and cause the destruction to the second functional layer, hole barrier material in the second composite layer can play the effect of blockking the hole flow direction second functional layer in addition, can effectively avoid unnecessary hole to form leakage current and destroy the second functional layer, thereby increase the life-span of organic light emitting unit, increase the life-span of display panel. In addition, 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 display panel is prolonged.
Drawings
Fig. 1 is a schematic diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
With the increasing demand of high brightness and long lifetime of products, the efficiency and lifetime of OLED devices are further improved. Factors affecting the lifetime, in addition to the stability of the material itself, device structural factors such as the balance of carriers also play a crucial role. The injection and transmission of electrons/holes in the panel are improved, the balance of carriers is improved, the recombination zone is enlarged, and the service life of the device is prolonged.
Based on the above technical problem, the present application proposes the following solutions:
the first embodiment is as follows:
fig. 1 is a schematic diagram of a display panel according to an embodiment of the present invention, and referring to fig. 1, the display panel includes:
a substrate 10, and a plurality of organic light emitting units 20 disposed on the substrate 10;
the organic light emitting unit 20 includes an anode layer 21, a first functional layer 22, an organic light emitting layer 23, a second functional layer 24, and a cathode layer 25, which are stacked; the first functional layer 22 includes a hole injection layer, a hole transport layer, and an electron blocking layer, which are stacked; a first composite layer 26 is further disposed between the organic light emitting layer 23 and the electron blocking layer of the at least one organic light emitting unit 20, and the first composite layer 26 includes a host light emitting material and an electron blocking material.
The substrate 10 is an array substrate for driving the organic light emitting unit 20 to emit light, the substrate 10 includes a display area and a non-display area, the organic light emitting unit 20 is disposed in an area corresponding to the display area, so that a picture is displayed, and the area corresponding to the non-display area does not display the picture. When an electric signal is applied to the anode 21 and the cathode 25 of the organic light emitting unit 20, holes are generated in the anode 21, electrons are generated in the cathode 25, the holes and the electrons are recombined in the organic light emitting layer 23 by the electric signal to generate excitons, and the excitons emit light after radiation transition.
Specifically, the first functional layer 22 serves to improve hole injection and transport capabilities of the organic light emitting unit 20, and the second functional layer 24 serves to improve electron injection and transport capabilities of the organic light emitting unit 20. The organic light emitting layer 23 of each color organic light emitting unit 20 includes a host light emitting material and a light emitting guest material of corresponding color, the light emitting guest material may be an organic dye, a fluorescent material, a phosphorescent material, or the like, and the first composite layer 26 of the organic light emitting unit 20 includes the host light emitting material and an electron blocking material of corresponding color. Illustratively, the organic light emitting layer of the blue organic light emitting unit includes a blue host material and a blue light emitting guest material, and the first composite layer disposed in the blue organic light emitting unit includes a blue host material and an electron blocking material.
Because the first composite layer 26 and the organic light emitting layer 23 have the same host light emitting material, the HOMO level difference between the first composite layer 26 and the organic light emitting layer 23 is smaller, the first composite layer 26 can be used as a level transition layer between the anode layer 21 and the organic light emitting layer 23 to improve the hole injection capability, and the arrangement of the first composite layer 26 can increase the exciton recombination zone, so that the exciton recombination zone is prevented from deviating to the anode 21 to damage the first functional layer 22, and in addition, the electron blocking material in the first composite layer 26 can play a role in blocking electrons from flowing to the first functional layer 22, so that the phenomenon that the redundant electrons reach the anode 21 to form leakage current to damage the first functional layer 22 can be effectively avoided, and the service life of the organic light emitting unit is prolonged. In addition, by improving the hole injection capability, increasing the exciton recombination region and avoiding the formation of leakage current, the light emitting efficiency of the organic light emitting unit 20 can be effectively improved, and the service life of the organic light emitting unit 20 can be further improved.
In addition, the first composite layer 26 may be in a co-evaporation form during evaporation, or in a pre-mixing form, in which the components of the first composite layer 26 are separately placed in corresponding crucibles for evaporation, and the pre-mixing form is that the components of the first composite layer 26 are mixed in the same crucible for evaporation, so that the number of crucibles can be reduced.
It should be noted that the anode 21 is exemplarily shown in fig. 1 to be provided on the surface of the substrate 10, but the present invention is not limited thereto, and the cathode 25 may be provided on the surface of the substrate 10 in another embodiment.
Alternatively, the plurality of organic light emitting units 20 includes a blue organic light emitting unit, and a first composite layer including a blue host material and an electron blocking material is disposed between the blue organic light emitting layer of the blue organic light emitting unit and the electron blocking layer in the first functional layer 22.
Specifically, because the life-span of blue organic light emitting unit is lower, the life-span of display panel has been restricted, set up first composite bed through between the electron blocking layer in blue organic light emitting layer and the first functional layer 22 of blue organic light emitting unit, the hole injection ability of blue organic light emitting unit can effectual improvement, increase exciton recombination zone, reduce the leakage current, the life-span of first functional layer 22 can be increased on the one hand, thereby increase the life-span of blue organic light emitting unit, and then increase the life-span of display panel, on the other hand can improve the luminous efficacy of blue organic light emitting unit, further increase the life-span of blue organic light emitting unit, increase the life-span of display panel.
Example two:
fig. 2 is a schematic view of another display panel provided in an embodiment of the present invention, and optionally, referring to fig. 2, a second composite layer 27 is disposed between the organic light emitting layer and the hole blocking layer, where the second composite layer 27 includes a host light emitting material and a hole blocking material.
Because the second composite layer 27 and the organic light emitting layer 23 have the same main body light emitting material, the LOMO energy level difference between the second composite layer 27 and the organic light emitting layer 23 is smaller, the second composite layer 27 can be used as an energy level transition layer between the cathode layer 22 and the organic light emitting layer 23, the electron injection capability is improved, and the exciton recombination zone can be increased by arranging the second composite layer 27, the exciton recombination zone is prevented from deviating to the cathode layer 22 to damage the second functional layer 23, in addition, a hole blocking material in the second composite layer 27 can play a role of blocking a hole from flowing to the second functional layer 23, the phenomenon that the redundant hole reaches the cathode layer 22 to form leakage current to damage the second functional layer 23 can be effectively avoided, and the service life of the organic light emitting unit is. In addition, by improving the electron injection capability, increasing the exciton recombination region and avoiding the formation of leakage current, the light emitting efficiency of the organic light emitting unit 20 can be effectively improved, and the service life of the organic light emitting unit 20 can be further improved.
The first composite layer 26 and the second composite layer 27 may be applied simultaneously or alternatively as desired. Specifically, when the luminescent layer material is electron-biased, the first composite layer scheme can be selected; when the material of the luminous layer is subjected to hole transmission, the scheme of the second composite layer can be selected, and the service life of the device is prolonged.
In addition, the second composite layer 27 may be co-evaporated during evaporation, or may be pre-mixed, where co-evaporation means that the components of the second composite layer 27 are separately placed in corresponding crucibles for evaporation, and pre-mixing means that the components of the second composite layer 27 are mixed in the same crucible for evaporation, and the advantage of pre-mixed evaporation is that the number of crucibles can be reduced.
Alternatively, the mixing ratio of the host light emitting material and the electron blocking material of the first composite layer 26 is 1: 1; and/or the mixing ratio of the host light-emitting material and the hole blocking material of the second composite layer 27 is 1: 1.
optionally, the thicknesses of the first composite layer 26 and the second composite layer 27 are set to be 0.1nm to 20nm, so that the organic light emitting unit 20 can have a smaller thickness, and the display panel can have a smaller thickness, which is in line with the development trend of thinning the display panel.
Example three:
in this embodiment, a third composite layer is disposed between the hole transport layer and the electron blocking layer of the first functional layer, and the third composite layer includes a hole transport material and an electron blocking material. Optionally, the third composite layer comprises a P-doped hole transport material or a P-doped electron blocking material. The P-type doped material is an electron transport material with a very deep HOMO level, and is a strong electron acceptor. After the hole transport layer or the electron blocking layer is doped with the P-type doping material, electrons on the HOMO of the hole transport layer or the electron blocking layer can be transferred to the P-type dopant to form a large number of vacancies, and the conductivity and the mobility can be remarkably improved. After the doping layer is in contact with the electron blocking layer of the pure hole transport layer, the energy level difference between the electron blocking layer and the hole transport layer is favorably reduced, and the effects of improving hole injection, reducing driving voltage and prolonging the service life of a device are achieved.
Alternatively, the mixing ratio of the hole transport material and the electron blocking material of the third composite layer is 1: 1; or, the mixing ratio of the P-type doped hole transport material or the P-type doped electron blocking material of the third composite layer is 1: 1.
optionally, by setting the thickness of the third composite layer to be 0.1nm to 20nm, it can be ensured that the organic light emitting unit 20 has a smaller thickness, so as to ensure that the display panel has a smaller thickness, which is in line with the development trend of lightness and thinness of the display panel.
Optionally, the electron blocking material comprises at least one of 4,4 '-cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ] and 4,4', 4 ″ -tris (carbazol-9-yl) triphenylamine.
Example four:
the organic light emitting unit further includes a blue organic light emitting unit, a red organic light emitting unit, and a green organic light emitting unit. The host material of each light emitting unit may be selected to be the same as the host light emitting material of the organic light emitting layer.
Fig. 3 is a schematic view of another display panel provided in an embodiment of the present invention, and optionally, referring to fig. 3, the organic light emitting layer includes a base unit 231 and a doping unit 232 which are stacked, the doping unit 232 is sandwiched between the two base units 231, the doping unit 232 is doped with a host light emitting material and a guest light emitting material, and the light emitting guest material includes an organic dye, a fluorescent material, or a phosphorescent material. Specifically, the host luminescent material is 4,4' -bis (9-carbazole) biphenyl or 1, 3-bis-9-carbazolylbenzene, and the guest luminescent material is 4,4' -bis (2, 2-distyryl) -1,1' -biphenyl or N, N ' -diphenyl-N, N ' - (1-naphthyl) -1,1' -biphenyl-4, 4' -diamine. That is, the doping of the guest luminescent material is not performed at the interface between the organic luminescent layer and the hole blocking layer and at the interface between the organic luminescent layer and the electron blocking layer, so that the quenching of the guest luminescence caused by impurities in the interface area is avoided, and the service life of the device is prolonged. At this time, excitons generated at the interface can be transferred to the guest by means of remote energy transfer to emit light.
In addition, it should be noted that the specific type of the display panel is not specifically limited in this embodiment, the scheme of this embodiment may be applied to any display panel related to the transmission process of electrons and holes, and the exemplary display panel may be an OLED display panel, a quantum dot light emitting diode QLED display panel, a micro light emitting diode micro led display panel, or a stretched OLED display panel.
Fig. 4 is a schematic diagram of a display device according to an embodiment of the present invention, and referring to fig. 4, the display device 100 includes a display panel 200 according to any embodiment of the present invention. The display device 100 may be an electronic display device such as a mobile phone and a tablet computer.
The display device of the embodiment arranges the first composite layer between the organic light-emitting layer and the electron blocking layer, because the first composite layer and the organic light-emitting layer have the same main body light-emitting material, the HOMO energy level difference between the first composite layer and the organic light-emitting layer is smaller, the first composite layer can be used as an energy level transition layer between the anode and the organic light-emitting layer, the hole injection capability is improved, the exciton recombination zone can be increased by arranging the first composite layer, the exciton recombination zone is prevented from deviating to the anode to damage the first functional layer, in addition, the electron blocking material in the first composite layer can play a role in blocking electrons from flowing to the first functional layer, the phenomenon that the redundant electrons form leakage current to damage the first functional layer can be effectively avoided, the service life of the organic light-emitting unit is prolonged. In addition, by improving the hole 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 display panel is prolonged.
Similarly, through setting up the second composite layer between organic light emitting layer and hole barrier layer, because the second composite layer has the same main part luminescent material with organic light emitting layer, make the LUMO energy level difference between second composite layer and the organic light emitting layer less, the second composite layer can regard as the energy level transition layer between cathode layer and the organic light emitting layer, improve electron injection ability, and set up the second composite layer and can increase exciton recombination district, avoid exciton recombination district deviation negative pole and cause the destruction to the second functional layer, hole barrier material in the second composite layer can play the effect of blockking the hole flow direction second functional layer in addition, can effectively avoid unnecessary hole to form leakage current and destroy the second functional layer, thereby increase the life-span of organic light emitting unit, increase the life-span of display panel. In addition, 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 display panel is prolonged.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A display panel comprises a substrate and a plurality of organic light-emitting units arranged on the substrate, and is characterized in that the organic light-emitting units comprise an anode layer, a hole injection layer, a hole transport layer, an electron blocking layer, an organic light-emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer and a cathode layer which are arranged in a stacking mode; a first composite layer is arranged between the organic light-emitting layer and the electron blocking layer, and comprises a main body light-emitting material and an electron blocking material; and/or the presence of a gas in the gas,
and a second composite layer is arranged between the organic light-emitting layer and the hole blocking layer and comprises a main body light-emitting material and a hole blocking material.
2. The display panel according to claim 1, wherein a mixing ratio of the host light emitting material and the electron blocking material of the first composite layer is 1: 1; and/or the mixing ratio of the main luminescent material and the hole blocking material of the second composite layer is 1: 1.
3. the display panel according to claim 1, wherein a third composite layer is provided between the hole transport layer and the electron blocking layer, and the third composite layer comprises a hole transport material and an electron blocking material.
4. The display panel according to claim 3, wherein a mixing ratio of the hole transport material and the electron blocking material of the third composite layer is 1: 1.
5. the display panel according to claim 1, wherein a third composite layer is disposed between the hole transport layer and the electron blocking layer, and the third composite layer comprises a P-type doped hole transport material or a P-type doped electron blocking material.
6. The display panel according to claim 5, wherein the first composite layer, the second composite layer, and the third composite layer each have a thickness of 0.1nm to 20 nm.
7. The display panel according to claim 1, wherein the organic light emitting layer comprises a matrix unit and a doping unit, the matrix unit and the doping unit are stacked, the doping unit is sandwiched between the two matrix units, the doping unit is doped with a host light emitting material and a light emitting guest material, and the light emitting guest material comprises an organic dye, a fluorescent material or a phosphorescent material.
8. The display panel according to claim 1, wherein the electron blocking material in the composite layer comprises at least one of 4,4 '-cyclohexylbis [ N, N-bis (4-methylphenyl) aniline ] and 4,4', 4 "-tris (carbazol-9-yl) triphenylamine.
9. The display panel according to any one of claims 1 to 8, wherein: the organic light emitting unit further comprises a blue organic light emitting unit, a red organic light emitting unit and a green organic light emitting unit.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628096A (en) * | 2020-06-10 | 2020-09-04 | 京东方科技集团股份有限公司 | Organic light emitting diode, preparation method thereof and organic light emitting diode display device |
| CN111864097A (en) * | 2020-07-28 | 2020-10-30 | 吉林奥来德光电材料股份有限公司 | Organic electroluminescent device and display device thereof |
| CN111916574A (en) * | 2020-08-21 | 2020-11-10 | 京东方科技集团股份有限公司 | Blue light electroluminescent device, display panel and display device |
| CN112467046A (en) * | 2020-12-02 | 2021-03-09 | 吉林奥来德光电材料股份有限公司 | Organic electroluminescent device, preparation method thereof and display device |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1668155A (en) * | 2005-03-21 | 2005-09-14 | 友达光电股份有限公司 | Organic electroluminescent device and display device thereof |
| US20070228938A1 (en) * | 2006-03-30 | 2007-10-04 | Eastman Kodak Company | Efficient white-light OLED display with filters |
| US20130153881A1 (en) * | 2010-09-24 | 2013-06-20 | Hitachi, Ltd. | Organic light-emitting devices and light source systems |
| US20140175392A1 (en) * | 2012-12-20 | 2014-06-26 | Industrial Technology Research Institute | White organic light-emitting diodes |
| CN104716265A (en) * | 2015-03-30 | 2015-06-17 | 京东方科技集团股份有限公司 | Blue light organic light-emitting device, manufacturing method, display panel and display device |
| CN107146853A (en) * | 2017-05-03 | 2017-09-08 | 武汉华星光电技术有限公司 | Organic light-emitting display device |
| CN108281559A (en) * | 2018-01-08 | 2018-07-13 | 太原理工大学 | A kind of high efficiency, the low phosphorescence Organic Light Emitting Diode that roll-offs |
| CN109004092A (en) * | 2018-06-29 | 2018-12-14 | 云谷（固安）科技有限公司 | Organic electroluminescence device and Organnic electroluminescent device |
| CN109360897A (en) * | 2018-09-17 | 2019-02-19 | 云谷（固安）科技有限公司 | A kind of display panel and display device |
| JP2019192556A (en) * | 2018-04-26 | 2019-10-31 | キヤノン株式会社 | Organic el element, and display device, lighting device, and moving body having the same |
-
2019
- 2019-11-29 CN CN201911204958.1A patent/CN111048675A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1668155A (en) * | 2005-03-21 | 2005-09-14 | 友达光电股份有限公司 | Organic electroluminescent device and display device thereof |
| US20070228938A1 (en) * | 2006-03-30 | 2007-10-04 | Eastman Kodak Company | Efficient white-light OLED display with filters |
| US20130153881A1 (en) * | 2010-09-24 | 2013-06-20 | Hitachi, Ltd. | Organic light-emitting devices and light source systems |
| US20140175392A1 (en) * | 2012-12-20 | 2014-06-26 | Industrial Technology Research Institute | White organic light-emitting diodes |
| CN104716265A (en) * | 2015-03-30 | 2015-06-17 | 京东方科技集团股份有限公司 | Blue light organic light-emitting device, manufacturing method, display panel and display device |
| CN107146853A (en) * | 2017-05-03 | 2017-09-08 | 武汉华星光电技术有限公司 | Organic light-emitting display device |
| CN108281559A (en) * | 2018-01-08 | 2018-07-13 | 太原理工大学 | A kind of high efficiency, the low phosphorescence Organic Light Emitting Diode that roll-offs |
| JP2019192556A (en) * | 2018-04-26 | 2019-10-31 | キヤノン株式会社 | Organic el element, and display device, lighting device, and moving body having the same |
| CN109004092A (en) * | 2018-06-29 | 2018-12-14 | 云谷（固安）科技有限公司 | Organic electroluminescence device and Organnic electroluminescent device |
| CN109360897A (en) * | 2018-09-17 | 2019-02-19 | 云谷（固安）科技有限公司 | A kind of display panel and display device |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628096A (en) * | 2020-06-10 | 2020-09-04 | 京东方科技集团股份有限公司 | Organic light emitting diode, preparation method thereof and organic light emitting diode display device |
| WO2021249160A1 (en) * | 2020-06-10 | 2021-12-16 | 京东方科技集团股份有限公司 | Organic light-emitting diode and preparation method therefor, and organic light-emitting diode display apparatus |
| CN111864097A (en) * | 2020-07-28 | 2020-10-30 | 吉林奥来德光电材料股份有限公司 | Organic electroluminescent device and display device thereof |
| CN111916574A (en) * | 2020-08-21 | 2020-11-10 | 京东方科技集团股份有限公司 | Blue light electroluminescent device, display panel and display device |
| CN111916574B (en) * | 2020-08-21 | 2023-12-01 | 京东方科技集团股份有限公司 | Blue light electroluminescent device, display panel and display device |
| WO2022104753A1 (en) * | 2020-11-20 | 2022-05-27 | 京东方科技集团股份有限公司 | Light-emitting device, display panel and display apparatus |
| CN112467046A (en) * | 2020-12-02 | 2021-03-09 | 吉林奥来德光电材料股份有限公司 | Organic electroluminescent device, preparation method thereof and display device |
| CN114284446A (en) * | 2021-12-30 | 2022-04-05 | 云谷（固安）科技有限公司 | Blue light emitting device, display panel and display device |
| CN114284446B (en) * | 2021-12-30 | 2023-11-24 | 云谷（固安）科技有限公司 | Blue light emitting device, display panel and display device |
| WO2024000662A1 (en) * | 2022-07-01 | 2024-01-04 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
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