CN113078271B - Organic electroluminescent device and display device - Google Patents
Organic electroluminescent device and display device Download PDFInfo
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- CN113078271B CN113078271B CN202010005128.2A CN202010005128A CN113078271B CN 113078271 B CN113078271 B CN 113078271B CN 202010005128 A CN202010005128 A CN 202010005128A CN 113078271 B CN113078271 B CN 113078271B
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- 238000012986 modification Methods 0.000 claims abstract description 31
- 230000004048 modification Effects 0.000 claims abstract description 31
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 238000000605 extraction Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000011368 organic material Substances 0.000 claims abstract description 10
- 239000012621 metal-organic framework Substances 0.000 claims description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical group [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 8
- 229910052709 silver Inorganic materials 0.000 claims description 8
- 239000004332 silver Substances 0.000 claims description 8
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 7
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000007740 vapor deposition Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 16
- 239000004065 semiconductor Substances 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 229920001621 AMOLED Polymers 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920000767 polyaniline Polymers 0.000 description 2
- GKWLILHTTGWKLQ-UHFFFAOYSA-N 2,3-dihydrothieno[3,4-b][1,4]dioxine Chemical compound O1CCOC2=CSC=C21 GKWLILHTTGWKLQ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000144 PEDOT:PSS Polymers 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- -1 i.e. Polymers 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 229960002796 polystyrene sulfonate Drugs 0.000 description 1
- 239000011970 polystyrene sulfonate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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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
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
-
- 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
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides an organic electroluminescent device and a display device, the organic electroluminescent device includes: an anode layer; an organic light emitting layer formed on the anode layer; an electron injection layer formed on a side of the organic light emitting layer facing away from the cathode layer; a cathode layer formed on one side of the electron injection layer facing away from the organic light emitting layer; a light extraction layer formed on a side of the cathode layer facing away from the electron injection layer; and a first cathode modification layer formed between the electron injection layer and the light extraction layer and in direct contact with a first side of the cathode layer; the first cathode modification layer is made of an organic material and/or an inorganic semiconductor material with the surface tension of more than 70 dyn/cm. The invention can obviously improve the conductivity and film forming effect of the cathode, and is beneficial to improving the problems of high cathode impedance, poor film forming effect and the like in large-area display.
Description
Technical Field
The invention relates to the field of display panels, in particular to an organic electroluminescent device and a display device comprising the same.
Background
AMOLED (Active-matrix organic light-emitting diode), i.e., active matrix organic light emitting diode or Active matrix organic light emitting diode, is a trend of the next generation display. AMOLED displays are increasingly being used because of the wide color gamut, high contrast, power savings, and other advantages. Because the display panel is generally in a top emission device structure in the manufacturing process, and the cathode is generally in a silver alloy, impedance exists due to the fact that the silver alloy is thinner, and particularly, the influence of the impedance is serious for large-area OLED display. Therefore, how to improve the conductivity of the cathode is a problem that large area OLED displays must overcome.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the invention and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an organic electroluminescent device and a display device comprising the same, so as to improve the conductivity of a cathode.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an organic electroluminescent device, comprising:
an anode layer;
an organic light emitting layer formed on the anode layer;
an electron injection layer formed on a side of the organic light emitting layer facing away from the cathode layer;
a cathode layer formed on one side of the electron injection layer facing away from the organic light emitting layer;
a light extraction layer formed on a side of the cathode layer facing away from the electron injection layer; and
a first cathode modification layer formed between the electron injection layer and the light extraction layer and directly contacting a first side of the cathode layer; the first cathode modification layer is made of an organic material and/or an inorganic semiconductor material with the surface tension of more than 70 dyn/cm.
In an embodiment of the invention, the organic electroluminescent device further includes a second cathode modification layer formed between the electron injection layer and the light extraction layer and directly contacting a second side of the cathode layer facing away from the first side.
In one embodiment of the present invention, the cathode modification layer has a thickness ofTo->
In one embodiment of the present invention, the cathode modification layer has a thickness of
In an embodiment of the present invention, the material of the light extraction layer is metal organic framework compound MOFs.
In one embodiment of the invention, the MOFs are deposited on the cathode layer or the cathode modification layer by a vapor deposition method.
In an embodiment of the present invention, the material of the cathode layer is silver or magnesium-silver alloy.
In one embodiment of the present invention, the organic electroluminescent device is a top emission type organic electroluminescent device.
In one embodiment of the present invention, the organic electroluminescent device is a bottom emission type organic electroluminescent device.
According to another aspect of the present invention, there is provided a display apparatus including the organic electroluminescent device as described above.
According to the invention, the cathode of the OLED device is modified by adopting the organic material and/or the inorganic semiconductor material with the surface tension larger than 70dyn/cm, so that the conductivity and the film forming effect of the cathode can be obviously improved, and the problems of high cathode impedance, poor film forming effect and the like in large-area display can be favorably improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention and, together with the description, further features, objects and advantages of the invention, will become apparent from a reading of the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of an organic electroluminescent device according to another embodiment of the present invention. And
Fig. 3 is a schematic structural diagram of an organic electroluminescent device according to another embodiment of the present invention.
Reference numerals
1. Anode layer
2. Organic light emitting layer
3. Electron injection layer
4. First cathode modification layer
5. Cathode layer
6. Light extraction layer
7. Second cathode modification layer
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
Example 1
Fig. 1 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the invention. As shown in fig. 1, the present embodiment provides an organic electroluminescent device, which includes: an anode layer 1, an organic light emitting layer 2, an electron injection layer 3, a cathode layer 5, a light extraction layer 6 and a first cathode modification layer 4. The organic light emitting layer 2 is formed on the anode layer 1; the electron injection layer 3 is formed on the side of the organic light emitting layer 2 facing away from the cathode layer 5; the cathode layer 5 is formed on the side of the electron injection layer 3 facing away from the organic light emitting layer 2; the light extraction layer 6 is formed on the side of the cathode layer 5 facing away from the electron injection layer 3; the first cathode modification layer 4 is formed between the electron injection layer 3 and the cathode layer 5 and is in direct contact with the cathode layer 5, and the material of the cathode layer 5 is silver or magnesium-silver alloy. Experiments show that the film forming effect of the metal Ag is strongly related to the material which is in direct contact with the metal Ag, and when the surface energy of the material which is in contact with the metal Ag is larger, the metal Ag is easier to form a uniform film with low resistance. Therefore, the first cathode modification layer 4 is made of an organic material and/or an inorganic semiconductor material with a surface tension of more than 70dyn/cm, such as ZnS and MoO3, wherein the surface tension of ZnS is about 76dyn/cm and the surface tension of MoO3 is about 74dyn/cm.
The invention can obviously improve the conductivity and film forming effect of the cathode, and is beneficial to improving the problems of high cathode impedance, poor film forming effect and the like in large-area display. Wherein, the thickness of the cathode modification layer can be adjusted according to the electrical requirement, and the thickness can be between 10 and 10Between them. Preferably, the thickness of the cathode modification layer is +.>It should be noted that, the organic material may also raise its surface tension according to the design of the molecular material, so that the silver electrode or silver electrode of the OLED device is smoother and has stronger conductivity.
Further, the material of the light extraction layer 6 may be metal organic framework compounds MOFs. It will be appreciated by those skilled in the art that the material of the light extraction layer 6 in the present invention is not limited to MOFs, and other organic materials may be used. In this embodiment, the MOFs may be deposited on the cathode layer 5 by a vapor deposition method. MOFs are periodic, multidimensional, network-structured porous materials formed by the combination of metal ions and organic ligands, exhibiting high specific surface area, high porosity, and relatively small solid densities. Therefore, after light exits from the cathode, the light is scattered to all directions through MOFs, so that the spectrum and the brightness observed from all angles are basically consistent, and the effect of reducing color cast of a large viewing angle is achieved. Optionally, the organic electroluminescent device is a top emission organic electroluminescent device. Of course, the invention is not limited to this, and is equally applicable to bottom emission type organic electroluminescent devices, and all organic electroluminescent devices employing the cathode modification layer of this structure to enhance the cathode film forming performance belong to the protection scope of this patent.
It should be noted that, the anode layer 1 in this embodiment, as a connection layer for forward voltage of the organic electroluminescent device, has better conductivity, light transmittance in the visible light region, and higher work function. The anode layer 1 is typically made of an inorganic metal oxide (e.g., indium Tin Oxide (ITO), zinc oxide (ZnO), etc.), an organic conductive polymer (e.g., poly 3, 4-ethylenedioxythiophene/polystyrene sulfonate (PEDOT: PSS), polyaniline PANI, etc.), or a high work function metal material (e.g., gold, copper, silver, platinum, etc.).
In short, the conductivity and the film forming effect of the cathode can be obviously improved, and the problems of high cathode impedance, poor film forming effect and the like in large-area display can be favorably improved.
Example 2
Fig. 2 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the invention. As shown in fig. 2, this embodiment differs from embodiment 1 mainly in that the organic electroluminescent device includes: an anode layer 1, an organic light emitting layer 2, an electron injection layer 3, a cathode layer 5, a light extraction layer 6 and a first cathode modification layer 4. The organic light emitting layer 2 is formed on the anode layer 1; the electron injection layer 3 is formed on the side of the organic light emitting layer 2 facing away from the cathode layer 5; the cathode layer 5 is formed on the side of the electron injection layer 3 facing away from the organic light emitting layer 2; the light extraction layer 6 is formed on the side of the cathode layer 5 facing away from the electron injection layer 3; the first cathode modification layer 4 is formed between the cathode layer 5 and the light extraction layer 6 and is in direct contact with the cathode layer 5, and the material of the cathode layer 5 is silver or magnesium-silver alloy; the first cathode modification layer 4 is made of an organic material and/or an inorganic semiconductor material with a surface tension of more than 70dyn/cm, such as ZnS and MoO3, wherein the surface tension of ZnS is about 76dyn/cm, and the surface tension of MoO3 is about 74dyn/cm. The invention can obviously improve the conductivity and film forming effect of the cathode, and is beneficial to improving the problems of high cathode impedance, poor film forming effect and the like in large-area display.
Example 3
Fig. 3 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the invention. As shown in fig. 3, this embodiment differs from embodiment 1 mainly in that the organic electroluminescent device includes: an anode layer 1, an organic light emitting layer 2, an electron injection layer 3, a cathode layer 5, a light extraction layer 6, a first cathode modification layer 4 and a second cathode modification layer. The organic light emitting layer 2 is formed on the anode layer 1; the electron injection layer 3 is formed on the side of the organic light emitting layer 2 facing away from the cathode layer 5; the cathode layer 5 is formed on the side of the electron injection layer 3 facing away from the organic light emitting layer 2; the light extraction layer 6 is formed on the side of the cathode layer 5 facing away from the electron injection layer 3; the first cathode modification layer 4 is formed between the electron injection layer 3 and the cathode layer 5 and is in direct contact with the cathode layer 5, and the second cathode modification layer 7 is formed between the electron injection layer 3 and the light extraction layer 6 and is in direct contact with a side of the cathode layer 5 facing away from the first cathode modification layer 4. The cathode layer 5 is made of silver or magnesium-silver alloy; the first cathode modification layer 4 is made of an organic material and/or an inorganic semiconductor material with a surface tension of more than 70dyn/cm, such as ZnS and MoO3, wherein the surface tension of ZnS is about 76dyn/cm, and the surface tension of MoO3 is about 74dyn/cm. In summary, the invention can obviously improve the conductivity and film forming effect of the cathode, and is beneficial to improving the problems of high cathode impedance, poor film forming effect and the like in large-area display.
According to another aspect of the present invention, there is provided a display apparatus including the organic electroluminescent device as described above. According to the invention, the cathode of the OLED device is modified by adopting the organic material and/or the inorganic semiconductor material with the surface tension larger than 70dyn/cm, so that the conductivity and the film forming effect of the cathode can be obviously improved, and the problems of high cathode impedance, poor film forming effect and the like in large-area display can be favorably improved.
In a specific implementation, the display device provided in this embodiment may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a media player, a watch device, a pendant device, an earphone or an earphone device, a navigation device, a wearable or miniature device, an embedded device of a system in which an electronic device with a display is installed in a self-service terminal or an automobile, and the like.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. At least one unit or device recited in the device claims may also be implemented by means of software or hardware. It should be understood that terms such as "lower" or "upper," "downward" or "upward" are used to describe features of the exemplary embodiments with reference to the locations where such features are shown in the figures; the terms first, second, etc. are used to denote a name, but not any particular order.
Claims (7)
1. An organic electroluminescent device, comprising:
an anode layer;
an organic light emitting layer formed on the anode layer;
an electron injection layer formed on a side of the organic light emitting layer facing away from the anode layer;
a cathode layer formed on one side of the electron injection layer facing away from the organic light emitting layer;
a light extraction layer formed on a side of the cathode layer facing away from the electron injection layer; and
a first cathode modification layer formed between the electron injection layer and the light extraction layer and directly contacting a first side of the cathode layer; the first cathode modification layer is made of an organic material with the surface tension of more than 70 dyn/cm;
a second cathode modification layer formed between the electron injection layer and the light extraction layer and directly contacting a second side of the cathode layer facing away from the first side;
the thickness of the cathode modification layer isTo->
The light extraction layer is made of metal organic framework compound MOFs.
2. The organic electroluminescent device of claim 1, wherein the cathode modification layer has a thickness of
3. The organic electroluminescent device of claim 1, wherein the MOFs are deposited on the cathode layer or the cathode modification layer by a vapor deposition method.
4. The organic electroluminescent device of claim 1, wherein the material of the cathode layer is silver or magnesium-silver alloy.
5. The organic electroluminescent device of claim 1, wherein the organic electroluminescent device is a top-emission organic electroluminescent device.
6. The organic electroluminescent device of claim 1, wherein the organic electroluminescent device is a bottom emission type organic electroluminescent device.
7. A display device comprising the organic electroluminescent device as claimed in any one of claims 1 to 6.
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| CN202010005128.2A CN113078271B (en) | 2020-01-03 | 2020-01-03 | Organic electroluminescent device and display device |
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| CN202010005128.2A CN113078271B (en) | 2020-01-03 | 2020-01-03 | Organic electroluminescent device and display device |
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| CN113078271A CN113078271A (en) | 2021-07-06 |
| CN113078271B true CN113078271B (en) | 2024-03-22 |
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