CN113078271A - Organic electroluminescent device and display device - Google Patents
Organic electroluminescent device and display device Download PDFInfo
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- CN113078271A CN113078271A CN202010005128.2A CN202010005128A CN113078271A CN 113078271 A CN113078271 A CN 113078271A CN 202010005128 A CN202010005128 A CN 202010005128A CN 113078271 A CN113078271 A CN 113078271A
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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 16
- 239000011368 organic material Substances 0.000 claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims abstract description 8
- 239000012621 metal-organic framework Substances 0.000 claims description 12
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 5
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 239000004332 silver Substances 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
- 239000010410 layer Substances 0.000 claims 27
- 239000002356 single layer Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 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 6
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920001621 AMOLED Polymers 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- -1 ITO Chemical class 0.000 description 1
- 229920000144 PEDOT:PSS Polymers 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 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
- 229920000767 polyaniline Polymers 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
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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
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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
- H10K50/85—Arrangements for extracting light from the devices
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The present invention provides an organic electroluminescent device and a display apparatus, the organic electroluminescent device including: 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; the cathode layer is formed on one side, away from the organic light emitting layer, of the electron injection layer; the light extraction layer is formed on one side, away from the electron injection layer, of the cathode 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 organic materials and/or inorganic semiconductor materials with surface tension larger than 70 dyn/cm. The invention can obviously improve the conductivity and the 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) is a trend of next generation display screen development. The AMOLED display is more and more widely applied due to the advantages of wide color gamut, high contrast, power saving, and the like. In the manufacturing process of the display panel, a top emission device structure is generally adopted, and the cathode generally adopts the MEAg alloy, and the resistance exists because the MEAg alloy is thinner, so that the resistance is particularly seriously influenced for large-area OLED display. Therefore, how to improve the conductive performance of the cathode is a problem that large-area OLED display must overcome.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person 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 conductive performance of a cathode.
In order to achieve the 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;
the cathode layer is formed on one side, away from the organic light emitting layer, of the electron injection layer;
the light extraction layer is formed on one side, away from the electron injection layer, of the cathode 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 organic materials and/or inorganic semiconductor materials with surface tension larger 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 away from the first side.
In one embodiment of the present invention, the thickness of the cathode modification layer is
To
In one embodiment of the present invention, the thickness of the cathode modification layer is
In an embodiment of the present invention, the material of the light extraction layer is a metal organic framework compound MOFs.
In one embodiment of the present invention, the MOFs are deposited on the cathode layer or the cathode modification layer by a vapor deposition method.
In one embodiment of the present invention, the material of the cathode layer is silver or a 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 of more 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 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 further features, objects, and advantages of the invention will become apparent from a reading of the following detailed description of non-limiting embodiments with reference to the drawings. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the present 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 view of an organic electroluminescent device according to still 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. Example embodiments may, however, be embodied in many different 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 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 their repetitive description 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 present invention. As shown in fig. 1, the present embodiment provides an organic electroluminescent device comprising: anode layer 1, organic luminescent layer 2, electron injection layer 3, cathode layer 5, light extraction layer 6 and 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 away from the cathode layer 5; the cathode layer 5 is formed on the side of the electron injection layer 3 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 cathode layer 5 is made of silver or magnesium-silver alloy. Experiments show that the film forming effect of the metal Ag is strongly related to materials in direct contact with the metal Ag, and when the surface energy of the materials 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 organic materials and/or inorganic semiconductor materials with surface tension greater 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 74 dyn/cm.
The invention can obviously improve the conductivity and the 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 10 to 10
In the meantime. Preferably, the thickness of the cathode modification layer is
It should be noted that the organic material may also increase the surface tension thereof according to the design of the molecular material, so that the silver-plated electrode of the OLED device or the silver-plated electrode is smoother and more conductive.
Further, the material of the light extraction layer 6 may be metal organic framework compounds MOFs. It will be understood 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. The MOFs are periodic multi-dimensional network structure porous materials formed by combination of metal ions and organic ligands, and have high specific surface area, high porosity and smaller solid density. Therefore, after the light exits from the cathode, the light is scattered to all directions through the MOFs, so that the observed spectrum and brightness from all angles are basically consistent, and the effect of reducing the large-viewing-angle color cast is achieved. Optionally, the organic electroluminescent device is a top emission type organic electroluminescent device. Of course, the invention is not limited to this, and is also applicable to bottom emission type organic electroluminescent devices, and all organic electroluminescent devices adopting the cathode modification layer with this structure to improve the cathode film-forming property belong to the protection scope of this patent.
The anode layer 1 in this embodiment has a good conductivity, a light transmittance in the visible light region, and a high work function as a connection layer of the forward voltage of the organic electroluminescent device. The anode layer 1 is usually made of inorganic metal oxide (e.g. ITO, ZnO, etc.), organic conductive polymer (e.g. PEDOT: PSS, PANI, etc.) or high work function metal material (e.g. au, cu, ag, pt, etc.).
In short, the conductivity and the film forming effect of the cathode can be remarkably improved, and the problems of high cathode impedance, poor film forming effect and the like in large-area display can be favorably solved.
Example 2
Fig. 2 is a schematic structural diagram of an organic electroluminescent device according to an embodiment of the present invention. As shown in fig. 2, the present embodiment is different from embodiment 1 mainly in that the organic electroluminescent device includes: anode layer 1, organic luminescent layer 2, electron injection layer 3, cathode layer 5, light extraction layer 6 and 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 away from the cathode layer 5; the cathode layer 5 is formed on the side of the electron injection layer 3 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 cathode layer 5 is made of silver or magnesium-silver alloy; the first cathode modification layer 4 is made of organic materials and/or inorganic semiconductor materials with surface tension larger 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 74 dyn/cm. The invention can obviously improve the conductivity and the 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 present invention. As shown in fig. 3, the present embodiment is different from embodiment 1 mainly in that the organic electroluminescent device includes: the cathode structure comprises 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 away from the cathode layer 5; the cathode layer 5 is formed on the side of the electron injection layer 3 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 one side of the cathode layer 5 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 organic materials and/or inorganic semiconductor materials with surface tension larger 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 74 dyn/cm. In conclusion, the invention can obviously improve the conductivity and the film forming effect of the cathode, and is beneficial to solving 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 of more 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 improved.
In specific implementation, the display device provided in this embodiment may be any product or component having 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 a headphone device, a navigation device, a wearable or miniature device, an embedded device of a system in which an electronic device having a display is installed in a self-service terminal or an automobile, and the like.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. 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 attributes 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 obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. At least one unit or means recited in the apparatus claims may also be implemented by one unit or means in software or hardware. It is to be understood that the terms "lower" or "upper", "downward" or "upward" and the like are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures; the terms first, second, etc. are used to denote names, but not any particular order.
Claims (10)
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 cathode layer;
the cathode layer is formed on one side, away from the organic light emitting layer, of the electron injection layer;
the light extraction layer is formed on one side, away from the electron injection layer, of the cathode 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 organic materials and/or inorganic semiconductor materials with surface tension larger than 70 dyn/cm.
2. The organic electroluminescent device of claim 1, further comprising 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.
3. The organic electroluminescent device of claim 1 or 2, wherein the cathode modification layer has a thickness of
To
4. The organic electroluminescent device according to claim 3, wherein the organic electroluminescent element is a single-layer organic electroluminescent elementThe thickness of the cathode modification layer is
5. The organic electroluminescent device according to claim 1, wherein the material of the light extraction layer is metal organic framework compounds (MOFs).
6. The organic electroluminescent device according to claim 7, wherein the MOFs are deposited on the cathode layer or the cathode modification layer by a vapor deposition method.
7. The organic electroluminescent device of claim 1, wherein the cathode layer is made of silver or a magnesium-silver alloy.
8. The organic electroluminescent device according to claim 1, wherein the organic electroluminescent device is a top emission type organic electroluminescent device.
9. The organic electroluminescent device according to claim 5, wherein the organic electroluminescent device is a bottom emission type organic electroluminescent device.
10. A display device characterized by comprising the organic electroluminescent device according to any one of claims 1 to 9.
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| CN202010005128.2A CN113078271B (en) | 2020-01-03 | 2020-01-03 | Organic electroluminescent device and display device |
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