CN108417725A - Luminescent device, display base plate - Google Patents
Luminescent device, display base plate Download PDFInfo
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- CN108417725A CN108417725A CN201810229600.3A CN201810229600A CN108417725A CN 108417725 A CN108417725 A CN 108417725A CN 201810229600 A CN201810229600 A CN 201810229600A CN 108417725 A CN108417725 A CN 108417725A
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- 239000002346 layers by function Substances 0.000 claims abstract description 140
- 239000000758 substrate Substances 0.000 claims abstract description 47
- 239000010410 layer Substances 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims description 17
- 239000003086 colorant Substances 0.000 claims description 10
- 239000012780 transparent material Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005525 hole transport Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 238000001259 photo etching Methods 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 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
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
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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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
A kind of luminescent device of present invention offer, display base plate, belong to Organic Light Emitting Diode technical field, can at least partly solve the problems, such as that the visual angle of the existing organic light-emitting diode display substrate with resonant cavity is smaller.The luminescent device of the present invention includes Organic Light Emitting Diode, and the Organic Light Emitting Diode includes the cathode, luminescent layer, anode of stacking, and one side is the reflective side of energy reflected light, and the other side is light emission side；And the luminescent device further includes：Functional layer group outside the light emission side of Organic Light Emitting Diode, the functional layer group is made of the functional layer of multiple stackings, wherein each functional layer is transparent, and arbitrary two successive functional layers have different refractive index.
Description
Technical Field
The invention belongs to the technical field of organic light emitting diodes, and particularly relates to a light emitting device and a display substrate.
Background
As shown in fig. 1, in an Organic Light Emitting Diode (OLED) display substrate, one organic light emitting diode 1 for emitting light is provided in each sub-pixel. Since the display substrate generally only needs one side to emit light, one side of the organic light emitting diode 1 can be set as a light emitting side with a light reflecting function (e.g. the cathode 12 itself of a light reflecting material such as aluminum is used as a light reflecting layer) for reflecting the light emitted from the light emitting layer 22 to the light emitting side (e.g. the side where the anode 13 of a transparent material such as indium tin oxide is located) to be emitted concentratedly.
The organic light emitting diode display substrate is affected by the reduction of the aperture opening ratio and the waveguide mode light loss, so that the defects of low light emitting efficiency, insufficient color purity and the like exist. For this reason, as shown in fig. 1, the light emitting side of the organic light emitting diode 1 is configured to be semi-reflective and semi-translucent, so that a resonant cavity is formed in the organic light emitting diode 1, and when light is reflected back and forth between the light emitting side and the semi-reflective and semi-translucent light emitting side, the light intensity is increased and the color purity is improved.
However, the lowest reflectivity of the existing transflective material is generally higher, that is, the resonant cavity formed by the material has stronger resonance capability, and as the resonance increases, the light-emitting angle range of the organic light-emitting diode 1 also decreases, thereby causing the viewing angle of the organic light-emitting diode display substrate to decrease.
Disclosure of Invention
The invention at least partially solves the problem that the prior organic light-emitting diode display substrate with a resonant cavity has a small visual angle, and provides a light-emitting device and a display substrate which can form the resonant cavity and have a good visual angle range.
The technical scheme adopted for solving the technical problem is that the light-emitting device comprises an organic light-emitting diode, wherein the organic light-emitting diode comprises a cathode, a light-emitting layer and an anode which are laminated, one side of the organic light-emitting diode is a light-reflecting side capable of reflecting light, and the other side of the organic light-emitting diode is a light-emitting side; and the light emitting device further comprises:
the functional layer group is arranged outside the light emitting side of the organic light emitting diode and consists of a plurality of laminated functional layers, wherein each functional layer is transparent, and any two adjacent functional layers have different refractive indexes.
Preferably, the functional layers are divided into a first functional layer having a first refractive index and a second functional layer having a second refractive index, and the first functional layer and the second functional layer are alternately arranged in a direction away from the organic light emitting diode.
Preferably, the number of the first functional layers is the same as the number of the second functional layers.
More preferably, the number of the first functional layers is 3 to 30.
Preferably, the functional layer is made of an insulating material.
Preferably, the difference in refractive index between any two adjacent functional layers is greater than or equal to 0.5.
Preferably, each of the functional layers has a thickness equal to n/4 of a peak wavelength of light emitted from the organic light emitting diode, n being a positive integer.
The technical scheme adopted for solving the technical problem of the invention is a display substrate, which comprises:
the light emitting device is arranged in each sub-pixel, and the light emitting sides of all the organic light emitting diodes face to the same direction.
Preferably, the display substrate further includes:
the cathodes of all the organic light-emitting diodes are made of light-reflecting materials, the anodes are made of transparent materials, and the anodes are closer to the substrate than the light-emitting layers;
the functional layer is arranged between the substrate and the anode.
Preferably, the organic light emitting diodes in the sub-pixels have the same light emitting color, the functional layer groups in the light emitting devices have the same structure, and the corresponding functional layers in the functional layer groups are connected into a whole;
or,
the organic light emitting diodes in each sub-pixel are divided into different light emitting colors; functional layer groups in the light-emitting device, where the organic light-emitting diodes with the same light-emitting color are located, have the same structure, and corresponding functional layers in the functional layer groups are arranged in the same layer; and the functional layer groups in the light-emitting devices of the organic light-emitting diodes with different light-emitting colors have different structures.
The organic light emitting diode of the light emitting device is also provided with a plurality of laminated functional layers (functional layer groups) outside the light emitting side, wherein each functional layer is transparent, but the adjacent functional layers have different refractive indexes; when light is irradiated to the interfaces of two transparent layers with different refractive indexes, one part of light is reflected and the other part of light is transmitted, a plurality of functional layers can form a plurality of interfaces, each interface can reflect part of light emitted from the light-emitting side of the organic light-emitting diode back, and the light is continuously reflected on the light-reflecting side to form resonance, so that the light-emitting efficiency can be improved, and the color purity can be improved.
Therefore, the interface between each functional layer has weak reflection capability, so that the whole reflectivity of the functional layer group can be changed within a large range by only adjusting the number of the functional layers, namely the resonance strength can be adjusted within a large range, and a weak resonant cavity structure can be formed by using the functional layer group, so that resonance is reduced as much as possible under the condition of meeting the improvement requirements on light-emitting efficiency and color purity according to the requirements, and the maximum light-emitting angle range (visual angle) is realized.
Drawings
Fig. 1 is a schematic cross-sectional view of a conventional light emitting device;
fig. 2 is a schematic cross-sectional view of a light-emitting device according to an embodiment of the present invention;
FIG. 3 is a schematic partial cross-sectional view of a display substrate according to an embodiment of the invention;
FIG. 4 is a schematic partial cross-sectional view of another display substrate according to an embodiment of the invention;
wherein the reference numerals are: 1. an organic light emitting diode; 11. a light emitting layer; 12. a cathode; 13. an anode; 2. a functional layer group; 21. a first functional layer; 22. a second functional layer; 29. a functional layer; 3. a pixel defining layer; 9. a substrate.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the present invention, the two structures "in the same layer" means that they are formed of the same material layer and thus are in the same layer in a stacked relationship, but do not represent that they are equidistant from the substrate nor that they are completely identical in structure with other layers between the substrate.
Example 1:
as shown in fig. 2 to 4, the present embodiment provides a light emitting device, which includes an organic light emitting diode 1, where the organic light emitting diode 1 includes a cathode 12, a light emitting layer 11, and an anode 13, which are stacked, and one side of the organic light emitting diode is a light reflecting side capable of reflecting light, and the other side of the organic light emitting diode is a light emitting side.
The above light emitting device refers to a device having a light emitting function, which includes an organic light emitting diode 1(OLED), and thus is an organic light emitting diode light emitting device that can be used in a display substrate, and can also be used as a separate light source, and the like.
In the above organic light emitting diode 1, there are conventional structures of a cathode 12, a light emitting layer 11, an anode 13, etc., which may be provided on the substrate 9. The light-emitting layer 11 may include an electron injection layer, an electron transport layer, an organic light-emitting material layer, a hole injection layer, a hole transport layer, and other known layered structures, and will not be described in detail herein. Furthermore, one side of the organic light emitting diode 1 is a light reflecting side, i.e. the side has the ability to reflect light, while the other side of the organic light emitting diode 1 is a light emitting side, i.e. the side allows light to exit.
In this embodiment, the cathode 12 is made of reflective metal such as aluminum, so the cathode 12 itself is a reflective layer, and the cathode side of the organic light emitting diode 1 is a reflective side; meanwhile, the anode 13 is made of a transparent material such as Indium Tin Oxide (ITO), so that the anode side of the organic light emitting diode 1 is the light emitting side.
Of course, the above forms of the light-reflecting side and the light-emitting side are only examples, and if the cathode 12 is made transparent by reducing the thickness thereof and a light-reflecting layer is provided outside the anode 13, the anode side of the organic light-emitting diode 1 may be made the light-reflecting side and the cathode side may be made the light-emitting side.
Unlike the conventional light emitting device, the light emitting device of the present embodiment further includes a functional layer group 2 disposed outside the light exit side of the organic light emitting diode 1, where the functional layer group 2 is formed by a plurality of stacked functional layers 29, each of the functional layers 29 is transparent, and any two adjacent functional layers 29 have different refractive indexes.
The organic light emitting diode 1 of the light emitting device of the present embodiment is further provided with a plurality of laminated functional layers 29 (functional layer group 2) outside the light exit side, wherein each functional layer 29 is transparent, but adjacent functional layers 29 have different refractive indexes; when light hits the interface of two transparent layers with different refractive indexes, one part of light is reflected and the other part of light is transmitted, and a plurality of functional layers 29 can form a plurality of interfaces, each interface can reflect part of light emitted from the light-emitting side of the organic light-emitting diode back and continuously reflect the light on the light-reflecting side to form resonance, so that the light-emitting efficiency can be improved, and the color purity can be improved.
It can be seen that the reflection capability of the interface between each functional layer 29 is not strong, so that the whole reflectivity of the functional layer group 2 can be changed in a large range by only adjusting the number of the functional layers 29, that is, the resonance intensity can be adjusted in a large range, so that a "weak resonant cavity" structure can be formed by using the functional layer group 2, and thus, resonance can be reduced as much as possible to realize the maximum light-emitting angle range (viewing angle) under the condition of meeting the requirements for improving the light-emitting efficiency and the color purity.
Preferably, the difference in refractive index between any two adjacent functional layers 29 is greater than or equal to 0.5.
Obviously, if the difference in refractive index between two adjacent functional layers 29 is too small, the proportion of light reflected at the interface thereof will be low, thereby affecting the reflection efficiency; in general, it is preferable that the difference between the refractive indices of two adjacent functional layers 29 exceeds 0.5.
Preferably, the functional layer 29 is divided into a first functional layer 21 having a first refractive index and a second functional layer 22 having a second refractive index, and the first functional layer 21 and the second functional layer 22 are alternately arranged in a direction away from the organic light emitting diode 1 (of course, the first refractive index and the second refractive index are necessarily different).
More preferably, the number of the first functional layers 21 is the same as that of the second functional layers 22.
More preferably, the number of the first functional layers 21 is 3 to 30.
In theory, the above object can be achieved by only the refractive indices of the adjacent functional layers 29 being different, but it is obvious that the range of refractive indices of the materials of the functional layers 29 that are practically usable is limited, so that it is difficult for the refractive indices of the plurality of functional layers 29 to be monotonically increased or decreased. Meanwhile, if the refractive index difference is too large, too large a change may be caused to the light-emitting angle. For this purpose, as shown in fig. 2, only two functional layers 29 (first functional layer 21, second functional layer 22) with different refractive indexes are used, and the refractive indexes are alternately distributed in the form of "high-low-high-low …" by the alternate arrangement of the two functional layers 29, so that the purpose of different refractive indexes of any adjacent functional layers 29 is achieved by using two materials.
The specific functional layer 29 that is closer to the oled 1 can be determined by the refractive index relationship between the functional layer 29 and the material on the light emitting side of the oled 1, for example, according to the method of fig. 2, since the refractive index of the ito anode 13 is about 1.5, which is not too high, the functional layer 29 with a higher refractive index is preferably adjacent to the ito anode.
Further, the number of the first functional layer 21 and the second functional layer 22 may be equal, that is, the first functional layer 21 and the second functional layer 22 may be paired, and the number of the pairs may be arbitrarily set as required, but may be generally 3 to 30.
Preferably, the functional layer 29 is made of an insulating material.
Obviously, the work functions of the materials of the two electrodes of the organic light emitting diode 1 are matched with the work function of the light emitting layer 11, while most of the existing layers with the semi-reflective and semi-transparent functions are conductive materials, so that the requirements of the work functions are difficult to meet if the organic light emitting diode 1 is used. For example, if a very thin aluminum layer is used as the semi-reflective and semi-permeable layer, it generally does not meet the work function requirement as an anode. Therefore, the material selection, the preparation and the like of the existing organic light emitting diode capable of forming the resonant cavity are difficult.
In the light emitting device of the present embodiment, the reflection is realized by the functional layer 29 made of an insulating material (such as silicon oxide, silicon nitride, silicon oxynitride, etc.), and the existence of the insulating layer does not affect the work function, so that the range of the selectable materials of the organic light emitting diode 1 is wide, and the preparation process is simple (i.e., the organic light emitting diode 1 itself may be in a form without a resonant cavity).
Preferably, each functional layer 29 has a thickness equal to n/4 of the peak wavelength of the light emitted by the organic light emitting diode 1, n being a positive integer.
For better resonance, the thickness of the cavity (i.e. the distance between the two reflecting surfaces) is required to be an integer multiple of the 1/4 wavelength of light (i.e. n λ/4). In the present embodiment, when light is reflected at the interface of different functional layers 29, the distance between the two corresponding reflective surfaces is different.
For this reason, the thickness of each functional layer 29 may be set to an integral multiple of 1/4 wavelengths of light, that is, the difference in the distance traveled by light is inevitably an integral multiple of 1/4 wavelengths regardless of which interface the light is reflected at. Therefore, if the total thickness of the light-emitting layer 11 and the anode 13 itself is ensured to be an integral multiple of the wavelength of 1/4, good resonance can be achieved for all light.
Of course, from the viewpoint of reducing the thickness, it is most preferable that the thickness uniformity of each functional layer 29 is equal to 1/4 (i.e., λ/4) of the peak wavelength of the light emitted from the organic light emitting diode 1.
The present embodiment further provides a display substrate, which includes:
and a plurality of sub-pixels, each of which is provided with one of the light emitting devices, wherein the light emitting sides of all the organic light emitting diodes 1 face the same direction.
That is, in an Organic Light Emitting Diode (OLED) display substrate, the above-described light emitting device may be employed as an actual light emitting unit in a sub-pixel. Obviously, in order to ensure that the display substrate can display in a certain direction, the light emitting sides of the organic light emitting diodes 1 should face the same direction. The functional layer group 2 is arranged in the light-emitting device, so that the light-emitting efficiency and the color purity can be improved, and the display substrate is ensured to have a larger visual angle.
Of course, it should be understood that other structures such as a wiring (a gate line, a data line, etc.), a pixel circuit (a thin film transistor, a capacitor, etc.), a pixel defining layer 3(PDL), a Color Filter (CF), etc. may be included in an actual display substrate, and will not be described in detail herein. Meanwhile, although the organic light emitting diodes 1 in the sub-pixels are separated, some of the structures may be connected together, for example, as shown in fig. 3 and 4, the cathodes 12 of the organic light emitting diodes 1 may be connected together.
Preferably, the display substrate further comprises a substrate 9, the cathodes 12 of all the organic light emitting diodes 1 are made of a light reflecting material, the anode 13 is made of a transparent material, and the anode 13 is closer to the substrate 9 than the light emitting layer 11; the functional layer 29 is provided between the substrate 9 and the anode 13.
That is, as shown in fig. 3 and 4, the display substrate preferably adopts a bottom emission type (i.e. light is emitted through the substrate 9), and the anode 13 of the organic light emitting diode 1 adopts a transparent material (e.g. indium tin oxide), so that the anode side is the light emitting side, the anode 13 should be closer to the substrate 9, and correspondingly, the functional layer group 2 should also be arranged between the substrate 9 and the anode 13 (or the organic light emitting diode 1). The structure is closer to the structure of the conventional display substrate, the process is mature, and the preparation is easy.
Of course, it should be understood that the above constructions do not limit the scope of the present invention. For example, the display substrate may also adopt a top emission mode, so that the functional layer group 2 may be farther from the substrate than the organic light emitting diode 1; alternatively, the organic light emitting diode 1 may have a light-reflecting side on the anode side and a light-emitting side on the cathode side.
Preferably, as an aspect of the present embodiment, the organic light emitting diodes 1 in the respective sub-pixels have the same emission color, the functional layer groups 2 in the respective light emitting devices have the same structure, and the respective functional layers 29 in the respective functional layer groups 2 are integrally connected.
When the sub-pixels of the display substrate are all of the same color (e.g., white), the wavelengths of the light emitted by the organic light emitting diodes 1 are the same, and thus the requirements for the number, thickness, material, etc. of the functional layer groups 2 in the sub-pixels are also the same. Therefore, as shown in fig. 3, the functional layer groups 2 in each sub-pixel have the same structure (i.e., the number, sequence, position, thickness, material, etc. of the functional layers 29 are the same), and the corresponding functional layers are connected into a whole, i.e., each functional layer 29 can be spread over the entire substrate 9, so that when each functional layer 29 is prepared, the patterning process such as photolithography is not needed, but only deposition is needed, and the process is simple.
Of course, since each functional layer 29 is a full layer, it is preferable that, as shown in fig. 3, the functional layer group 2 is located below the pixel defining layer 3(PDL), that is, it is preferable that each functional layer 29 is prepared first, and then the pixel defining layer 3 is prepared, so as to prevent each functional layer 29 from being fluctuated and to form the pixel defining layer 3 on a relatively flat basis.
Preferably, as another mode of the present embodiment, the organic light emitting diodes 1 in the respective sub-pixels are divided into different light emitting colors; the functional layer groups 2 in the light emitting device where the organic light emitting diodes 1 with the same light emitting color are located have the same structure, and the corresponding functional layers 29 in the functional layer groups 2 are arranged in the same layer; and the functional layer group 2 in the light-emitting device of each organic light-emitting diode 1 with different light-emitting colors has different structures.
When the sub-pixels of the display substrate are divided into different colors (e.g., red, green, and blue), the wavelengths of the light emitted by the organic light emitting diodes 1 are different, and thus the requirements of the number, thickness, material, etc. of the functional layers 29 in the sub-pixels of different colors are different. Therefore, as shown in fig. 4, functional layer groups 2 of different structures may be used in sub-pixels of different colors, and the functional layers 29 in these sub-pixels of different colors should be prepared separately. For the functional layer group 2 in the sub-pixels with the same color, their structures are still the same, and in this case, the corresponding functional layers 29 may be disposed in the same layer (but not necessarily connected together) to simplify the manufacturing process.
Of course, since the functional layer group 2 in different sub-pixels has different structures at this time, each functional layer group 2 is preferably located only in the corresponding sub-pixel. Therefore, as shown in fig. 4, the pixel defining layer 3(PDL) may be formed first and an opening may be formed therein; and then, forming corresponding functional layer groups 2 in the openings defined by the pixel defining layers 3 respectively by adopting a fine metal mask plate, a photoetching process and the like so as to ensure the accurate positions of the functional layer groups 2.
Example 2:
the present embodiment provides a display panel, which includes the display substrate.
That is, the above display substrate and the cell-to-cell substrate can be cell-paired to constitute a display panel having basic display capability.
The embodiment also provides a display device, which comprises the display panel.
That is, the above display panel can be combined with other components such as a power supply and a housing to constitute a display device having a complete display function.
Specifically, the display device is an organic light emitting diode display device, which can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A light-emitting device comprises an organic light-emitting diode, wherein the organic light-emitting diode comprises a cathode, a light-emitting layer and an anode which are laminated, one side of the organic light-emitting diode is a light-reflecting side capable of reflecting light, and the other side of the organic light-emitting diode is a light-emitting side; characterized in that the light emitting device further comprises:
the functional layer group is arranged outside the light emitting side of the organic light emitting diode and consists of a plurality of laminated functional layers, wherein each functional layer is transparent, and any two adjacent functional layers have different refractive indexes.
2. The light-emitting device according to claim 1,
the functional layers are divided into a first functional layer with a first refractive index and a second functional layer with a second refractive index, and the first functional layer and the second functional layer are alternately arranged in the direction away from the organic light emitting diode.
3. The light-emitting device according to claim 2,
the number of the first functional layers is the same as that of the second functional layers.
4. The light-emitting device according to claim 3,
the number of the first functional layers is 3-30.
5. The light-emitting device according to claim 1,
the functional layer is made of an insulating material.
6. The light-emitting device according to claim 1,
the difference between the refractive indexes of any two adjacent functional layers is greater than or equal to 0.5.
7. The light-emitting device according to claim 1,
each functional layer has a thickness equal to n/4 of the peak wavelength of light emitted by the organic light emitting diode, n being a positive integer.
8. A display substrate, comprising:
a plurality of sub-pixels, each of which has a light emitting device, the light emitting device being as claimed in any one of claims 1 to 7, wherein the light emitting sides of all the organic light emitting diodes face the same direction.
9. The display substrate of claim 8, further comprising:
the cathodes of all the organic light emitting diodes are made of light reflecting materials, the anodes are made of transparent materials, and the anodes are closer to the substrate than the light emitting layers;
the functional layer is arranged between the substrate and the anode.
10. The display substrate of claim 8,
the organic light emitting diodes in the sub-pixels have the same light emitting color, the functional layer groups in the light emitting devices have the same structure, and the corresponding functional layers in the functional layer groups are connected into a whole;
or,
the organic light emitting diodes in each sub-pixel are divided into different light emitting colors; functional layer groups in the light-emitting device, where the organic light-emitting diodes with the same light-emitting color are located, have the same structure, and corresponding functional layers in the functional layer groups are arranged in the same layer; and the functional layer groups in the light-emitting devices of the organic light-emitting diodes with different light-emitting colors have different structures.
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| CN201810229600.3A CN108417725A (en) | 2018-03-20 | 2018-03-20 | Luminescent device, display base plate |
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| CN201810229600.3A CN108417725A (en) | 2018-03-20 | 2018-03-20 | Luminescent device, display base plate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707233A (en) * | 2019-09-16 | 2020-01-17 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
| CN112234148A (en) * | 2020-09-08 | 2021-01-15 | 京东方科技集团股份有限公司 | Light emitting diode, display panel, display device and light emitting device |
| WO2021093727A1 (en) * | 2019-11-14 | 2021-05-20 | 京东方科技集团股份有限公司 | Package structure, display panel and display apparatus |
| WO2024022057A1 (en) * | 2022-07-25 | 2024-02-01 | 京东方科技集团股份有限公司 | Light-emitting module and light-emitting device |
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| WO2024022057A1 (en) * | 2022-07-25 | 2024-02-01 | 京东方科技集团股份有限公司 | Light-emitting module and light-emitting device |
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