CN112310314A - Light extraction module, organic light emitting diode and display device - Google Patents
Light extraction module, organic light emitting diode and display device Download PDFInfo
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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
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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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
Abstract
The invention discloses a light extraction module, an organic light emitting diode and a display device, wherein the light extraction module comprises: a first refractive layer; and the second refraction layer is arranged on the first refraction layer, and the refractive index of the first refraction layer is greater than that of the second refraction layer. The light extraction module can efficiently transmit light extracted from the adjacent light extraction surfaces, so that the light extraction efficiency of the organic light emitting diode is effectively improved.
Description
Technical Field
The invention relates to the technical field of light-emitting electronics, in particular to a light extraction module, an organic light-emitting diode and a display device.
Background
Organic Light Emitting Diodes (OLEDs) have been used in display and lighting fields of different sizes, such as bracelets, mobile phones, tablet computers, televisions, etc., due to their advantages of wide color gamut, high color saturation, superior Light Emitting performance, etc., and have great vitality in future display and lighting technologies.
The OLED device has a sandwich structure, belongs to an organic semiconductor light-emitting element, and has a laminated structure formed by a transmission layer and a light-emitting layer sandwiched between a positive electrode and a negative electrode. When a certain voltage is applied to the two electrodes of the OLED, the positively charged carriers drift to the light-emitting layer from the anode and the injection layer through the transmission layer, and the negatively charged carriers drift to the light-emitting layer from the cathode and the injection layer through the transmission layer, so that the positively charged carriers are combined in the light-emitting layer to generate excitons, and the excitons transfer energy to the light-emitting molecules to generate photons.
The main reference properties of OLED devices include: brightness (Luminance), Current Density (Current Density), External Quantum Efficiency (EQE), Lifetime (Lifetime), etc., wherein the EQE and Lifetime are the most critical reference indexes, and optimization of the OLED device at present mainly includes optimization and improvement of the two performances.
According to the different light Emitting directions of the OLED device, the OLED device can be divided into a Bottom emission (Bottom Emitting) device and a Top emission (Top Emitting) device. For a bottom emission device, the structure is that a transparent electrode, an organic functional layer and a metal electrode are sequentially constructed on a transparent substrate, the thickness of the metal electrode is more than 100nm, so that light can be reflected by the metal electrode and emitted from one side of the substrate, and the bottom emission device is generally applied to the field of illumination; for the structure of the top emission device, firstly, an opaque metal electrode is constructed on a transparent substrate, then an organic functional layer is constructed in sequence, and finally, a transparent mixed metal thin layer is covered on the top, so that light can be reflected by a non-transparent metal electrode at the bottom and emitted from one side of the top electrode back to the substrate, and the top emission device is more beneficial to circuit control, so that the top emission device is mainly applied to the display field.
However, in the case of a top emission device, since the light emitting layer is sandwiched between two metal electrodes, part of light is subjected to a microcavity effect and a surface plasmon effect of the metal electrodes, resulting in a decrease in light extraction efficiency.
Disclosure of Invention
The invention mainly aims to provide a light extraction module, an organic light emitting diode and a display device, and aims to solve the technical problem of low light extraction efficiency of the organic light emitting diode serving as a top emission device.
In order to achieve the above object, the present invention provides a light extraction module, which includes:
a first refractive layer; and
the second refraction layer is arranged on the first refraction layer, and the refractive index of the first refraction layer is larger than that of the second refraction layer.
Optionally, the light extraction module further includes a scattering layer, and the scattering layer is located between the first refraction layer and the second refraction layer.
Optionally, the scattering layer comprises a plurality of scattering particles having different particle sizes.
Optionally, the refractive index of the first refractive layer is greater than or equal to 2.
Optionally, the refractive index of the second refractive layer is greater than or equal to 1.1 and less than or equal to 1.5.
Optionally, the light extraction module includes a plurality of the first refraction layers, and the plurality of the first refraction layers are arranged at intervals on the same plane.
Optionally, the first refraction layer is a columnar refraction layer, and the diameter of the first refraction layer decreases from one side far away from the second refraction layer to one side of the second refraction layer.
Optionally, the second refractive layer is a flat refractive layer, and the second refractive layer covers the plurality of first refractive layers.
The present invention also provides an organic light emitting diode including:
an anode;
the light-emitting module is arranged on the anode and emits light towards one side departing from the anode;
the cathode is arranged on the light emitting side of the light emitting module;
and the light takes out the module, the light takes out the module and includes first refraction layer and second refraction layer, first refraction layer sets up on the cathode, and is located the cathode is kept away from one side of luminous module, the second refraction layer sets up first refraction layer deviates from one side of cathode, the refracting index of first refraction layer is greater than the refracting index of second refraction layer.
Optionally, the light emitting module includes a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer, and the hole injection layer, the hole transport layer, the light emitting layer, and the electron transport layer are sequentially arranged from the anode to the cathode.
In order to achieve the above object, the present invention also provides a display device including a substrate and an organic light emitting diode disposed on the substrate, the organic light emitting diode including:
an anode disposed on the substrate;
the light-emitting module is arranged on the anode and positioned on one side of the anode far away from the substrate, and emits light towards one side far away from the substrate;
the cathode is arranged on the light emitting side of the light emitting module;
and the module is taken out to light, the light is taken out first refraction layer of module and the second refraction layer, first refraction layer sets up on the negative pole, and is located the negative pole is kept away from one side of luminous module, the second refraction layer sets up first refraction layer deviates from one side of negative pole, the refracting index of first refraction layer is greater than the refracting index on second refraction layer.
In the embodiment of the invention, the light taken out from the cathode surface of the organic light-emitting diode is efficiently transmitted out through the structural arrangement of the light taking-out module of the organic light-emitting diode, so that the light-emitting efficiency is improved. Wherein, the module is taken out to light includes first refraction layer and second refraction layer, just the refracting index on first refraction layer and second refraction layer is different, the refracting index on first refraction layer is greater than the refracting index on second refraction layer, the light of its adjacent light output face can high-efficiently be taken out on the first refraction layer of high refracting index, if the negative pole of organic light emitting diode the light-emitting then with when the module is adjacent is taken out to light, the light on negative pole surface can be gone out by the efficient transmission, improves organic light emitting diode's luminous efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a light extraction module in an OLED according to the present invention;
fig. 2 is a schematic structural diagram of an organic light emitting diode provided by the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
20 | Light- |
| 30 | |
21 | |
| 40 | |
22 | |
| 50 | |
23 | LuminescenceLayer(s) |
| 51 | A first |
24 | |
| 52 | Scattering layer | 53 | A second refractive layer |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but on the basis of the realization of the technical solutions by a person skilled in the art, when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and the technical solutions are not within the protection scope of the present invention.
The invention provides a light extraction module which is suitable for an organic light emitting diode, and is particularly used for extracting light on the light emitting side of a cathode of the organic light emitting diode.
Referring to fig. 1, the light extraction module 50 provided by the present invention includes a first refraction layer 51 and a second refraction layer 53, wherein the second refraction layer 53 is disposed on the first refraction layer 51, and a refractive index of the first refraction layer 51 is greater than a refractive index of the second refraction layer 53.
The light extraction module 50 is used in an organic light emitting diode, and is configured to extract light emitted by a light emitting module of the organic light emitting diode, so that the light emitting efficiency of the diode is increased while emitting light.
It is understood that, in the structure of the emission device, the cathode and the anode of the emission device may be metal electrodes, or may be electrodes formed by other materials, where the cathode is in a transparent structure, and the anode is in a non-transparent structure, if the cathode and the anode are metal electrodes, since the light emitting module is located between the cathode and the anode, the cathode and the anode may cause a microcavity effect to occur in a gap between the cathode and the anode by a portion of light emitted by the light emitting module. In addition, when light is emitted to the cathode, because the cathode is a metal electrode, free electrons on the surface of the metal electrode oscillate collectively, and if the oscillation frequency of electrons is consistent with the frequency of incident light, resonance is generated, and the energy of an electromagnetic field in a resonance state is effectively converted into collective vibration energy of the free electrons on the surface of the metal electrode, so that part of light is oscillated on the surface of the metal electrode and cannot be emitted, namely, a plasmon effect is generated on the surface of the metal electrode. And based on the factors such as the structure and the refractive index of the light-emitting module, part of light is totally reflected, so that the projection rate of the light is low, and the light-emitting efficiency is low.
The present embodiment improves the light extraction module 50 to improve the light extraction efficiency of the organic light emitting diode. Specifically, the first refractive layer 51 in the light extraction module 50 is a high refractive layer, which may be an organic material containing high refractive index and low extinction coefficient characteristic genes, based on the first refractive layer 51, so that a part of light oscillating on a metal surface is incident into the first refractive layer 51 based on a medium of the first refractive layer 51, and the first refractive layer 51 initially improves the extraction efficiency of the limited light. The light extraction module 50 further includes a second refraction layer 53, and the second refraction layer 53 is a low refraction layer, and the refraction layer may be made of MgF2, MgS, LiF, or other materials. Light penetrates into the first refraction layer 51, passes through the second refraction layer 53 is penetrated into again behind the first refraction layer 51, based on the refracting index of first refraction layer 51 and second refraction layer 53 is different, just the refracting index of first refraction layer 51 is higher than the refracting index of second refraction layer 53, and the transmissivity of light transmission through two media is related with the material, and when the medium that the refracting index is little is penetrated into to the head from the medium that the refracting index is big, can promote the principle of the transmissivity of light, and this embodiment is through first refraction layer 51 with the structure setting of second refraction layer 53, can provide the projecting rate of light in the module 50 is taken out to light.
Therefore, in the present embodiment, the light extracted from the cathode surface of the organic light emitting diode is efficiently transmitted out by the structural arrangement of the light extraction module 50 for the organic light emitting diode, so that the light extraction efficiency is improved. Wherein, the module 50 is taken out to light includes first refraction layer 51 and second refraction layer 53, just the refracting index of first refraction layer 51 and second refraction layer 53 is different, the refracting index of first refraction layer 51 is greater than the refracting index of second refraction layer 53, the light of the light output face rather than adjacent can high-efficiently be taken out to the first refraction layer 51 of high refractive index, if the cathodic light-emitting of organic light emitting diode then with when the module 50 is adjacent is taken out to light, the light on cathode surface can be gone out by the efficient transmission, improves organic light emitting diode's luminous efficiency.
It should be noted that the first refraction layer 51 in this embodiment may be implemented by vacuum evaporation, or the first refraction layer 51 may be formed by a mask and then implemented by vacuum evaporation. The second refraction layer 53 is implemented by PVD (Physical Vapor Deposition) or vacuum evaporation, and the fabrication process is feasible, so as to implement the arrangement of the light extraction module 50.
In one embodiment, in order to achieve better light extraction effect, the refractive index of the first refractive layer 51 is greater than or equal to 2, and the thickness is in a range of 40nm to 1000 nm. And/or the refractive index of the second refraction layer 53 is greater than or equal to 1.1 and less than or equal to 1.5, and the thickness range is 150nm-2000 nm.
In a further embodiment, based on the fact that the refractive index of the first refractive layer 51 is greater than the refractive index of the second refractive layer 53, in the transmission process of light, based on the fact that light is emitted from a medium with dense light (i.e., the refractive index of light in the medium is large) to an interface of a medium with sparse light (i.e., the refractive index of light in the medium is small), all light is reflected, so as to avoid the light extraction module 50 in the embodiment of the present invention reflecting light back to the light emitting module 20, which may result in a low light extraction rate. The light extraction module 50 in this embodiment further includes a scattering layer 52, and the scattering layer 52 is located between the first refraction layer 51 and the second refraction layer 53.
That is, the light is emitted from the first refraction layer 51, and the diffusion layer 52 changes the propagation mode of the light, so that the incident angle of the light entering the second refraction layer 53 is avoided as much as possible from the critical angle of total reflection, thereby reducing the total reflection amount of the light.
The scattering layer 52 in this embodiment is disposed on the first refractive layer 51, and has a thickness in a range of 150nm to 2000nm, and the scattering layer 52 is implemented by Physical Vapor Deposition (pvd).
In a more preferred embodiment, the scattering layer 52 includes a plurality of scattering particles having different particle sizes. For example, the scattering layer 52 is mainly composed of particles having a particle size ranging from 50nm to 550nm, and the scattering particles may be metal or nonmetal oxides having a low extinction coefficient, such as TiO2, ZrO2, SiO2, or a combination thereof.
In this embodiment, the scattering layer 52 is composed of a plurality of scattering particles with different particle sizes, so that the light changes different directions, thereby further avoiding the occurrence of the total reflection of light and further improving the light transmission effect.
The light extraction module 50 in this embodiment includes a first refraction layer 51, a scattering layer 52, and a second refraction layer 53, in which the first refraction layer 51 is used as a high refractive index layer, and can primarily improve the extraction efficiency of light limited by total reflection, and enters the second refraction layer 53 after the scattering effect of the scattering layer 52, and the second refraction layer 53 is used as a low refractive index layer, so that the total reflection probability of light entering a medium from the light extraction module 50 is reduced, and the absorption rate of the light extraction module 50 on the extracted light is also reduced, thereby achieving the purpose of improving the light extraction efficiency.
It is understood that the light extraction module 50 in the embodiment of the present invention is composed of a high refractive index layer, a scattering layer 52, and a low refractive index layer with a planarization effect, and the thickness of the whole light extraction structure is in the range of 500nm to 5 μm, so as to achieve a higher light transmission effect. Wherein the high refractive index layer of alternate structure deposit with vacuum evaporation through specific mask plate on the negative pole 40, compare in single-deck light take out structure and double-deck light take out structure and have better light take out effect, reduce the absorption to the emergent light, can show the luminous efficacy who promotes organic light emitting device.
In one embodiment, in order to increase the light entering the first refraction layer 51 and make the probability of total reflection of the light high, the embodiment provides the first refraction layer 51 in a non-full-covering form, for example, an organic light emitting diode includes a plurality of the first refraction layers 51, and a plurality of the first refraction layers 51 are arranged on the cathode 40 at intervals. That is, the first refraction layers 51 are periodically and uniformly distributed on the cathode, and a certain gap is formed between the first refraction layers 51, so that the effect of improving the refractive index of the emergent light by the first refraction layers 51 can be ensured, and the high probability of total reflection of the light caused by the fact that the light passes through the first refraction layers 51 completely can be avoided.
Based on this, in order to improve the light extraction effect of the light extraction module 50, the scattering layer 52 in this embodiment is further disposed in the gap between the first refractive layers 51 to increase the contact area between the scattering layer 52 and the first refractive layers 51, so that the light emitted from the first refractive layers 51 passes through more scattering layers 52 and is then emitted, and the number of the light subjected to total reflection is reduced.
Further, the first refraction layer 51 is a cylindrical refraction layer, and the diameter of the first refraction layer 51 decreases progressively from the cathode 40 side to the second refraction layer 53 side, so that the contact area between the scattering layer 52 and the first refraction layer 51 is further increased, the propagation direction of more light is changed, and the total reflectance is further reduced. The method is realized by a vacuum evaporation mode through a mask plate with a specific fine periodic pattern structure.
Further, the second refraction layer 53 is a flat refraction layer, and the second refraction layer 53 covers the plurality of second refraction layers 53. The second refraction layer 53 can reduce absorption of light extracted and also has a planarization effect.
Further, the light emitting module 20 in this embodiment includes a hole injection layer 21, a hole transport layer 22, a light emitting layer 23, and an electron transport layer 24, and the hole injection layer 21, the hole transport layer 22, the light emitting layer 23, and the electron transport layer 24 are sequentially arranged from the anode 30 to the cathode 40.
Furthermore, the invention also provides an organic light emitting diode which is used for providing illumination for a display screen of the display device.
Referring to fig. 1 and fig. 2, the organic light emitting diode provided by the present invention is a top emission device, and specifically the organic light emitting diode includes: an anode 30, a light emitting module 20, a cathode 40, and a light extraction module 50.
The light emitting module 20 is disposed on the anode 30, the light emitting module 20 emits light toward a side away from the anode 30, when the light emitting diode is mounted on the substrate 10, light emission (top emission device) is realized toward a side away from the substrate 10, and the cathode 40 is disposed on the light emitting side of the light emitting module 20; the light extraction module 50 is disposed on a side of the cathode 40 away from the light emitting module 20.
The light extraction module 50 is the light extraction module 50 according to the above embodiments, and is configured to extract the light emitted from the light emitting module, so that the light emitting efficiency of the diode is increased while emitting light. Specifically, the light extraction module 50 in this embodiment includes a first refraction layer 51 and a second refraction layer 53, the first refraction layer 51 is disposed on the cathode 40 and located at a side of the cathode 40 away from the light emitting module 20, the second refraction layer 53 is disposed at a side of the cathode 40 away from the first refraction layer 51, and a refractive index of the first refraction layer 51 is greater than a refractive index of the second refraction layer 53.
It can be understood that, in the structure of the emission device, the cathode 40 and the anode 30 of the emission device may be metal electrodes, or may be electrodes formed by other materials, in the case that the cathode 40 is a transparent structure, and the anode 30 is a non-transparent structure, if the cathode 40 and the anode 30 are metal electrodes, since the light-emitting module 20 is located between the cathode 40 and the anode 30, the cathode 40 and the anode 30 may cause a microcavity effect to occur in a gap between the cathode 40 and the anode 30 for a portion of light emitted by the light-emitting module 20. In addition, when light is emitted to the cathode 40, since the cathode 40 is a metal electrode, free electrons on the surface of the metal electrode oscillate collectively, and if the oscillation frequency of electrons coincides with the frequency of incident light, resonance occurs, and the energy of the electromagnetic field is efficiently converted into collective vibration energy of free electrons on the surface of the metal electrode in the resonance state, so that part of the light oscillates on the surface of the metal electrode and cannot be emitted, that is, a plasmon effect occurs on the surface of the metal electrode. Based on the structure of the light emitting module 20 and the factors such as the refractive index, the total reflection of part of the light occurs, which results in a low light transmittance and thus a low light extraction efficiency.
In this embodiment, the light extraction module 50 is disposed on the cathode 40, so as to extract light from the surface of the cathode 40, thereby improving the light extraction efficiency. Specifically, in the present embodiment, by providing the light extraction module 50 on the cathode 40, the light on the surface of the cathode 40 can be extracted, and meanwhile, the light extraction module 50 includes the first refraction layer 51 and the second refraction layer 53, and the refractive indexes of the first refraction layer 51 and the second refraction layer 53 are different, and the refractive index of the first refraction layer 51 is greater than the refractive index of the second refraction layer 53, so that the light extracted from the surface of the cathode 40 can be efficiently transmitted out, and the light extraction efficiency of the organic light emitting diode can be effectively improved.
Further, the light emitting module 20 in this embodiment includes a hole injection layer 21, a hole transport layer 22, a light emitting layer 23, and an electron transport layer 24, and the hole injection layer 21, the hole transport layer 22, the light emitting layer 23, and the electron transport layer 24 are sequentially arranged from the anode 30 to the cathode 40.
When a certain voltage is applied to the cathode 40 and the anode 30 at two ends of the light emitting module 20, the positively charged carriers drift from the anode 30 to the light emitting layer 23 through the electron transport layer 24, and the negatively charged carriers drift from the hole injection layer 21 to the light emitting layer 23 through the hole transport layer 22 from the cathode 40, so that the positively charged carriers recombine in the light emitting layer 23 to generate excitons, the excitons transfer energy to the light emitting molecules to generate photons, and the light emitting module 20 emits light, while the light is transmitted to the light extraction module 50 through the cathode 40.
In order to achieve the above object, the present invention also provides a display device including a substrate 10 and an organic light emitting diode disposed on the substrate 10, the organic light emitting diode including:
an anode 30, the anode 30 being disposed on the substrate 10;
the light emitting module 20 is arranged on the anode 30 and located on one side of the anode 30 far away from the substrate 10, and the light emitting module 20 emits light towards one side far away from the substrate 10;
the cathode 40 is arranged on the light emitting side of the light emitting module 20;
and light takes out module 50, light takes out first refraction layer 51 and second refraction layer 53 of module 50, first refraction layer 51 sets up on the negative pole 40, and is located negative pole 40 keeps away from one side of luminescence module 20, second refraction layer 53 sets up first refraction layer 51 deviates from one side of negative pole 40, the refracting index of first refraction layer 51 is greater than the refracting index of second refraction layer 53.
The display device in this embodiment may be a mobile phone, a flat panel, or a television, and the display panel in the display device provides a light source through the light emitting diode.
It can be understood that, since the display device in this embodiment includes the light emitting diode in any of the above embodiments, the light emitting diode has high light transmittance, and the light emitting effect of the light emitting diode is improved, so that when the display device is applied to a display device, the display device also has a high light emitting effect.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. The light extraction module, comprising:
a first refractive layer; and
the second refraction layer is arranged on the first refraction layer, and the refractive index of the first refraction layer is larger than that of the second refraction layer.
2. The light extraction module of claim 1 further comprising a scattering layer positioned between said first refractive layer and said second refractive layer.
3. The light extraction module of claim 2, wherein said scattering layer comprises a plurality of scattering particles having different particle sizes.
4. The light extraction module of claim 1, wherein the first refractive layer has a refractive index greater than or equal to 2.
5. The light extraction module of claim 1, wherein the refractive index of the second refractive layer is greater than or equal to 1.1 and less than or equal to 1.5.
6. The light extraction module of claim 1, wherein the light extraction module comprises a plurality of the first refractive layers, and the plurality of the first refractive layers are spaced apart and arranged on a same plane.
7. The light extraction module of claim 6, wherein the first refractive layer is a cylindrical refractive layer, and the diameter of the first refractive layer decreases from the side away from the second refractive layer to the side of the second refractive layer.
8. The light extraction module of claim 6, wherein said second refractive layer is a flat refractive layer, said second refractive layer overlying a plurality of said first refractive layers.
9. An organic light emitting diode, comprising:
an anode;
the light-emitting module is arranged on the anode and emits light towards one side departing from the anode;
the cathode is arranged on the light emitting side of the light emitting module;
and the light extraction module of any of claims 1-8, the first refractive layer of the light extraction module being located on a side of the cathode away from the light emitting module.
10. The oled according to claim 9, wherein the light-emitting module includes a hole injection layer, a hole transport layer, a light-emitting layer, and an electron transport layer, and the hole injection layer, the hole transport layer, the light-emitting layer, and the electron transport layer are sequentially arranged from the anode toward the cathode.
11. A display device characterized in that it comprises an organic light emitting diode according to claim 9 or 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011167899.8A CN112310314A (en) | 2020-10-27 | 2020-10-27 | Light extraction module, organic light emitting diode and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011167899.8A CN112310314A (en) | 2020-10-27 | 2020-10-27 | Light extraction module, organic light emitting diode and display device |
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| CN113036055A (en) * | 2021-03-03 | 2021-06-25 | 吉林奥来德光电材料股份有限公司 | Flexible organic light-emitting device, preparation method thereof and display device |
| CN113140686A (en) * | 2021-04-01 | 2021-07-20 | 吉林奥来德光电材料股份有限公司 | Display device for improving large-viewing-angle color cast and display device comprising same |
| CN113555515A (en) * | 2021-07-16 | 2021-10-26 | 京东方科技集团股份有限公司 | Light emitting device and display panel |
| WO2023050171A1 (en) * | 2021-09-29 | 2023-04-06 | 京东方科技集团股份有限公司 | Light-emitting substrate and light-emitting apparatus |
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