CN109473563B - OLED light-emitting device - Google Patents
OLED light-emitting device Download PDFInfo
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- CN109473563B CN109473563B CN201710807975.9A CN201710807975A CN109473563B CN 109473563 B CN109473563 B CN 109473563B CN 201710807975 A CN201710807975 A CN 201710807975A CN 109473563 B CN109473563 B CN 109473563B
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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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- 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
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
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Abstract
The embodiment of the invention relates to the technical field of display, in particular to an OLED (organic light emitting diode) light emitting device which is used for reducing large-viewing-angle color cast. The OLED light-emitting device provided by the embodiment of the invention comprises a first electrode, an organic light-emitting layer formed on the first electrode, a second electrode formed on the organic light-emitting layer and a first light extraction layer formed on the second electrode, wherein the first light extraction layer is made of a porous material with a periodic net-shaped framework, so that light emitted from the second electrode is diffused to all directions through the first light extraction layer, and the color cast phenomenon of the light observed from all observation angles can be reduced.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to an OLED light-emitting device.
Background
Organic Light-emitting devices (OLEDs for short) are classified according to the Light-emitting direction, and mainly include OLEDs having bottom-emitting and top-emitting structures. The top-emitting OLED refers to an OLED in which light is emitted from the top of the device, and has the advantages of improving the efficiency of the device, narrowing the spectrum, improving the color purity and the like. The manufacturing sequence of the top-emitting OLED device structure is as follows: the organic light emitting diode comprises a substrate, a high reflection electrode, an organic light emitting layer and a semi-reflection electrode. However, the top emission OLED includes an opaque total reflection electrode and a semitransparent electrode, a light emission center emission spectrum may resonate to finally emit resonant light, and since the resonant light has a concentrated direction, the resonant cavity length is also shortened under a large viewing angle, so that a light emission peak shifts with a shift of a viewing angle, which causes a difference in luminance and a shift in chromaticity, and particularly under a large viewing angle, the optical properties are not good, and a light emission spectrum and luminance observed from each direction greatly change with a change of an observation angle, which causes a color shift at a large viewing angle.
Disclosure of Invention
The embodiment of the invention provides an OLED (organic light emitting diode) light emitting device which is used for reducing large-viewing-angle color cast.
An embodiment of the present invention provides an OLED light emitting device, including: a first electrode; an organic light emitting layer formed on the first electrode; a second electrode formed on the organic light emitting layer; and the first light extraction layer is formed on the second electrode, and the composition material of the first light extraction layer is a porous material with a periodic reticular skeleton.
Optionally, the porous material with the periodic network skeleton is a metal organic skeleton compound MOFs.
Optionally, the MOFs are formed by a self-assembly film-forming method of metal ions and organic ligands.
Optionally, the metal ion includes any one of a main group metal ion, a transition metal ion and a lanthanide metal ion; the organic ligand is any one of aromatic carboxylic acid ligand and nitrogen-containing heterocyclic ligand.
Optionally, the MOFs are deposited on the second electrode by using a vapor deposition method.
Optionally, the thickness of the first light extraction layer is 10-1000 nm.
Optionally, a second light extraction layer is further included between the second electrode and the first light extraction layer; the composition material of the second light extraction layer is an organic material with a non-porous structure.
Optionally, the second light extraction layer is made of N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine or 8-hydroxyquinoline aluminum.
The invention provides an OLED light-emitting device, which comprises a first electrode, an organic light-emitting layer formed on the first electrode, a second electrode formed on the organic light-emitting layer and a first light extraction layer formed on the second electrode, wherein the first light extraction layer is made of a porous material with a periodic net-shaped framework, so that light emitted from the second electrode is diffused to all directions through the porous material with the periodic net-shaped framework, the direction concentration of the light can be inhibited, the degree of change of the spectrum and the brightness of emergent light observed from all angles along with the observation angles is reduced, and the color cast phenomenon of the light observed from all observation angles can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of an OLED light-emitting device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a MOFs self-assembly process according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an OLED light-emitting device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a schematic structural diagram of an OLED light-emitting device according to an embodiment of the present invention. As shown in fig. 1, the OLED light emitting device includes: the organic light emitting diode comprises a first electrode 101, an organic light emitting layer 102 formed on the first electrode, a second electrode 103 formed on the organic light emitting layer, and a first light extraction layer 104 formed on the second electrode, wherein the first light extraction layer 104 is made of a porous material with a periodic net-shaped framework.
The OLED light-emitting device comprises a first electrode, an organic light-emitting layer formed on the first electrode, a second electrode formed on the organic light-emitting layer and a first light extraction layer formed on the second electrode, wherein the first light extraction layer is made of a porous material with a periodic net-shaped framework, so that light emitted from the second electrode is diffused to all directions through the porous material with the periodic net-shaped framework, the direction concentration of the light can be inhibited, the degree of change of the spectrum and the brightness of the emergent light observed from all angles along with the observation angles is small, and the color cast phenomenon of the light observed from all observation angles can be reduced.
In a top-emitting OLED device, the first electrode 101 is an anode and the second electrode 103 is a cathode.
In the embodiment of the present invention, the porous material having a periodic mesh skeleton may be, for example, a tin dioxide mesoporous material; as another example, MOFs may also be a metal organic framework compound. 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 low solid density, so that light is scattered to all directions through the MOFs after being emitted from the second electrode, the spectrums and the brightness observed from all angles are basically consistent, and the effect of reducing large-viewing-angle color cast is achieved.
In the embodiment of the invention, the MOFs are formed by metal ions and organic ligands through a self-assembly film forming mode. Fig. 2 shows a schematic diagram of a MOFs self-assembly process according to an embodiment of the present invention. As shown in FIG. 2, the metal ion center and the bridged organic ligand are connected with each other through self-assembly to form a porous material with a periodic network structure.
In the embodiment of the present invention, the methods for preparing MOFs include a layered diffusion method, a hydrothermal method, a solvothermal method, a stirring synthesis method, and the like, for example, the process for preparing MOFs by the solvothermal method is approximately: after the second electrode of the OLED device is manufactured, organic ligands and metal salts are added into an organic solvent through a solvothermal method, and the growth of MOFs is regulated by controlling the concentration, the temperature, the PH and the like of the solution. The specific reaction conditions can be set according to actual needs, and are not described in detail herein.
In the embodiment of the present invention, the metal ions in the MOFs include any one of metal ions of main group metal ions, transition metal ions, and lanthanide metal ions. The organic ligand is any one of aromatic carboxylic acid ligand and nitrogen-containing heterocyclic ligand. Wherein, the metal ions commonly used include Zn2+、Al3+，Cu2+、Fe3+Etc.; relatively common aromatic carboxylic acid ligands include p-benzoic acid, trimesic acid, and the like; the nitrogen heterocyclic ligand comprises imidazole pyrimidine, pyrimidine and the like. The embodiments of the present invention provide several alternative MOFs chemical formulas: zn4O(R-BDC)3、Zn2(R-BDC) (DABCO), Al (OH) (R-BDC) and Zn4O(BTB)4/3(R-BDC), and the like.
Based on fig. 1, MOFs were deposited on the second electrode using a vapor deposition method. In an alternative embodiment, the MOFs are deposited directly on the second electrode. In order to avoid damage to the second electrode caused by deposition of the MOFs directly on the second electrode, an alternative embodiment is provided in the embodiments of the present invention, in which the MOFs is deposited on a carrier, and then the MOFs is transferred onto the second electrode by a transfer method.
In the embodiment of the invention, if the first light extraction layer is too thin, the light emitted from the second electrode passes through the first light extraction layer and cannot be completely scattered to all directions, so that the effect of improving the color cast of a large viewing angle is poor; if the first light extraction layer is too thick, the optical path of the light emitted from the second electrode passing through the first light extraction layer is long, and the emitted light is likely to be absorbed by the material of the first light extraction layer, so that the light extraction rate is reduced. Optionally, the thickness of the first light extraction layer is 10-1000 nm. Preferably, the thickness of the first light extraction layer is 100 nm. Therefore, the absorption rate of emergent light passing through the second electrode by the first light extraction layer can be reduced, and the color cast of a large visual angle can be improved.
Based on fig. 1, an OLED light emitting device is further provided in the embodiment of the present invention, and fig. 3 is a schematic structural diagram of another OLED light emitting device provided in the embodiment of the present invention. As shown in fig. 3, the OLED light emitting device includes: a first electrode 101, an organic light emitting layer 102 formed on the first electrode, a second electrode 103 formed on the organic light emitting layer, a first light extraction layer 104 formed on the second electrode, and a second light extraction layer 105 positioned between the second electrode and the first light extraction layer; the composition material of the second light extraction layer 105 is an organic material with a non-porous structure. In an alternative embodiment, the second light extraction layer may be an organic material with a high refractive index and a low absorption rate, and the second light extraction layer may be composed of N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine or 8-hydroxyquinoline aluminum (Alq 3).
In the embodiment of the invention, compared with the OLED light-emitting device structure shown in fig. 1, the OLED light-emitting device structure shown in fig. 3 is added with a second light extraction layer. On one hand, the second electrode is generally a semi-reflective electrode, for example, Mg — Ag alloy is used, and an organic material with a non-porous structure as the second light extraction layer is added on the second electrode, and the organic material has the characteristics of high refractive index and low absorptivity, so that total reflection of emergent light from the second electrode to the air can be avoided, that is, the light extraction rate from the second electrode to the second light extraction layer is increased. Emergent light is emitted from the first light extraction layer to the air, and total reflection generally cannot occur; even if total reflection occurs from the first light extraction layer to the air, the reflected light is partially reflected by the second electrode, and therefore, the addition of the second extraction layer is advantageous in improving the transmittance and light extraction efficiency. On the other hand, the first light extraction layer is formed on the second light extraction layer, so that the direction concentration of light can be effectively inhibited, the degree of change of the spectrum and the brightness of emergent light observed from each angle along with the observation angle is small, and the color cast phenomenon of light observed from each observation angle can be reduced.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. An OLED light emitting device, comprising:
a first electrode;
an organic light emitting layer formed on the first electrode;
a second electrode formed on the organic light emitting layer;
a first light extraction layer formed on the second electrode, the first light extraction layer being composed of a porous material having a periodic network skeleton;
and the second light extraction layer is formed between the second electrode and the first light extraction layer, and the composition material of the second light extraction layer is an organic material with a non-porous structure.
2. The OLED light emitting device of claim 1, wherein the porous material having a periodic network skeleton is a metal organic skeleton compound MOFs.
3. The OLED light emitting device of claim 2, wherein the MOFs are formed by a self-assembly film-forming process of metal ions and organic ligands.
4. The OLED light emitting device of claim 3, wherein the metal ions include any one of main group metal ions, transition metal ions, and lanthanide metal ions; the organic ligand is any one of aromatic carboxylic acid ligand and nitrogen-containing heterocyclic ligand.
5. The OLED light emitting device of claim 2, wherein the MOFs are deposited on the second electrode using a vapor deposition method.
6. The OLED light emitting device of claim 1, wherein the first light extraction layer has a thickness of 10-1000 nm.
7. The OLED light emitting device of claim 1 wherein the second light extraction layer is composed of N, N '-diphenyl-N, N' - (1-naphthyl) -1,1 '-biphenyl-4, 4' -diamine or aluminum 8-hydroxyquinoline.
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| CN113078271B (en) * | 2020-01-03 | 2024-03-22 | 上海和辉光电股份有限公司 | Organic electroluminescent device and display device |
| CN112164710B (en) * | 2020-09-25 | 2022-04-26 | 武汉华星光电半导体显示技术有限公司 | OLED array substrate and display panel |
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| CN104779265A (en) * | 2014-01-14 | 2015-07-15 | 松下电器产业株式会社 | Laminated substrate, light-emitting device, and method for producing light-emitting device |
| CN105723540A (en) * | 2013-11-13 | 2016-06-29 | 康宁精密素材株式会社 | Light extraction substrate for organic light emitting element, method for manufacturing same, and organic light emitting element comprising same |
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| CN104183765A (en) * | 2013-05-22 | 2014-12-03 | 海洋王照明科技股份有限公司 | Organic light emitting diode and preparation method thereof |
| CN104218154A (en) * | 2013-05-30 | 2014-12-17 | 海洋王照明科技股份有限公司 | Organic light emission diode device and fabrication method thereof |
| CN103700781A (en) * | 2013-12-25 | 2014-04-02 | 京东方科技集团股份有限公司 | Organic light-emitting device, display substrate and organic electroluminescence display |
| US9985251B2 (en) * | 2014-10-28 | 2018-05-29 | The Trustees of Princeton University, Office of Technology and Trademark Licensing | Process for fabricating a porous film in a scattering layer |
| CN105957974B (en) * | 2016-06-16 | 2017-11-17 | 武汉华星光电技术有限公司 | A kind of organic light emitting diode device and display device |
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| CN105723540A (en) * | 2013-11-13 | 2016-06-29 | 康宁精密素材株式会社 | Light extraction substrate for organic light emitting element, method for manufacturing same, and organic light emitting element comprising same |
| CN104779265A (en) * | 2014-01-14 | 2015-07-15 | 松下电器产业株式会社 | Laminated substrate, light-emitting device, and method for producing light-emitting device |
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