CN113782557B - Light-emitting substrate and light-emitting device - Google Patents
Light-emitting substrate and light-emitting device Download PDFInfo
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- CN113782557B CN113782557B CN202111063119.XA CN202111063119A CN113782557B CN 113782557 B CN113782557 B CN 113782557B CN 202111063119 A CN202111063119 A CN 202111063119A CN 113782557 B CN113782557 B CN 113782557B
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- 239000000463 material Substances 0.000 claims description 15
- 239000002096 quantum dot Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical class [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
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- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
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- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
A light-emitting substrate and a light-emitting device, the light-emitting substrate includes: a substrate, at least one first light emitting device and at least one second light emitting device disposed on the substrate, the first light emitting device comprising: a first electrode, a second electrode and a first light-emitting functional layer, wherein the first electrode and the second electrode are sequentially arranged along the direction vertical to the substrate; the second light emitting device includes: the light emitting device comprises a substrate, a third electrode, a fourth electrode, a second light emitting functional layer, a color conversion layer and a color conversion layer, wherein the third electrode and the fourth electrode are sequentially arranged along the direction perpendicular to the substrate, the second light emitting functional layer is arranged between the third electrode and the fourth electrode, the color conversion layer is arranged on the light emitting side of the second light emitting functional layer, and the front projection of the color conversion layer on the substrate is overlapped with the front projection of the second light emitting functional layer on the substrate.
Description
Technical Field
Embodiments of the present disclosure relate to, but are not limited to, lighting technology, and more particularly, to a light emitting substrate and a light emitting device.
Background
The different color temperatures have different effects on the atmosphere and the emotion, the low color temperature spectrum is mainly red light, and the warm and relaxed feeling is suitable for the home environment; the high color temperature blue light has large proportion, so people have a relatively high spirit and are suitable for the office environment. For different occasions or times, it is necessary to provide the most suitable color temperature to achieve a high quality lighting environment.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the disclosure provides a light-emitting substrate and a light-emitting device, which meet the color temperature requirement.
The embodiment of the disclosure provides a light-emitting substrate, comprising: a substrate, at least one first light emitting device and at least one second light emitting device disposed on the substrate, the first light emitting device comprising: a first electrode, a second electrode and a first light-emitting functional layer, wherein the first electrode and the second electrode are sequentially arranged along the direction vertical to the substrate; the second light emitting device includes: the light emitting device comprises a substrate, a third electrode, a fourth electrode, a second light emitting functional layer, a color conversion layer and a color conversion layer, wherein the third electrode and the fourth electrode are sequentially arranged along the direction perpendicular to the substrate, the second light emitting functional layer is arranged between the third electrode and the fourth electrode, the color conversion layer is arranged on the light emitting side of the second light emitting functional layer, and the front projection of the color conversion layer on the substrate is overlapped with the front projection of the second light emitting functional layer on the substrate.
In an exemplary embodiment, the first light emitting functional layer and the second light emitting functional layer are light emitting functional layers that emit the same white light.
In an exemplary embodiment, the color conversion layer is disposed on a side of the substrate remote from the second light emitting functional layer.
In an exemplary embodiment, the color conversion layer is disposed between the substrate and the third electrode.
In an exemplary embodiment, the light emitting substrate further includes a scattering layer disposed on the light emitting side of the first light emitting functional layer and the second light emitting functional layer, and the orthographic projection of the scattering layer on the substrate overlaps with the orthographic projection of at least one of the first light emitting functional layer on the substrate and the orthographic projection of at least one of the second light emitting functional layer on the substrate.
In an exemplary embodiment, the scattering layer is disposed on a side of the color conversion layer remote from the second light emitting functional layer.
In an exemplary embodiment, the light emitting substrate includes a plurality of first light emitting devices forming a plurality of columns of light emitting devices arranged in a first direction and each column of first light emitting devices being arranged in a second direction, and a plurality of second light emitting devices forming a plurality of columns of light emitting devices arranged in the first direction and each column of second light emitting devices being arranged in the second direction and the columns of first light emitting devices and the columns of second light emitting devices being arranged at intervals in the first direction, the first direction and the second direction intersecting.
In an exemplary embodiment, the light emitting substrate includes a plurality of first light emitting devices and a plurality of second light emitting devices disposed at intervals along a first direction and disposed at intervals along a second direction, the first and second directions intersecting.
In an exemplary embodiment, the light emitting substrate includes a plurality of first light emitting devices and a plurality of second light emitting devices, first electrodes of the plurality of first light emitting devices are electrically connected to the first pad, third electrodes of the plurality of second light emitting devices are electrically connected to the second pad, and second electrodes of the plurality of first light emitting devices and fourth electrodes of the plurality of second light emitting devices are electrically connected.
In an exemplary embodiment, the material of the color conversion layer includes at least one of: quantum dots, perovskite, fluorescent materials.
An embodiment of the present disclosure provides a light emitting device including the light emitting substrate according to any one of the embodiments.
Embodiments of the present disclosure include a light emitting substrate including: a substrate, at least one first light emitting device and at least one second light emitting device disposed on the substrate, the first light emitting device comprising: a first electrode, a second electrode and a first light-emitting functional layer, wherein the first electrode and the second electrode are sequentially arranged along the direction vertical to the substrate; the second light emitting device includes: the light emitting device comprises a substrate, a third electrode, a fourth electrode, a second light emitting functional layer, a color conversion layer and a color conversion layer, wherein the third electrode and the fourth electrode are sequentially arranged along the direction perpendicular to the substrate, the second light emitting functional layer is arranged between the third electrode and the fourth electrode, the color conversion layer is arranged on the light emitting side of the second light emitting functional layer, and the front projection of the color conversion layer on the substrate is overlapped with the front projection of the second light emitting functional layer on the substrate. According to the scheme provided by the embodiment, the color conversion layer is arranged, light emitted by the second light-emitting functional layer is converted into light with different color temperatures from light emitted by the first light-emitting device, the light with the two color temperatures is mixed to obtain light with other color temperatures, and when the intensity of the light with the two color temperatures is changed, the light with the different color temperatures can be output, so that the color temperature requirement is met.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.
Drawings
The accompanying drawings are included to provide a further understanding of the technical aspects of the present disclosure, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present disclosure and together with the embodiments of the disclosure, and not constitute a limitation of the technical aspects.
FIG. 1 is a schematic diagram of a solution provided by the present invention;
FIG. 2 is a schematic diagram of a light-emitting substrate according to an exemplary embodiment;
FIG. 3 is a spectral light-emitting schematic of a light-emitting device according to an exemplary embodiment;
FIG. 4 is a schematic view of a light-emitting substrate provided in another exemplary embodiment;
FIG. 5 is a schematic view of a light-emitting substrate provided in another exemplary embodiment;
FIG. 6 is a schematic view of a light-emitting substrate provided in yet another exemplary embodiment;
FIG. 7 is a schematic plan view of a light-emitting substrate according to an exemplary embodiment;
fig. 8 is a schematic plan view of a light emitting substrate according to another exemplary embodiment.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The embodiments of the present disclosure and features in the embodiments may be arbitrarily combined with each other without collision.
The steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, while a logical order is depicted in the flowchart, in some cases, the steps depicted or described may be performed in a different order than presented herein.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
In the drawings, the size of each constituent element, the thickness of a layer, or a region may be exaggerated for clarity. Accordingly, embodiments of the present disclosure are not necessarily limited to this size, and the shapes and sizes of the various components in the drawings do not reflect actual proportions. Furthermore, the drawings schematically show ideal examples, and the embodiments of the present disclosure are not limited to the shapes or the numerical values shown in the drawings.
The ordinal numbers of "first", "second", "third", etc. in the present disclosure are provided to avoid intermixing of constituent elements, and do not denote any order, quantity, or importance.
In the present disclosure, for convenience, terms such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are used to describe positional relationships of the constituent elements with reference to the drawings, only for convenience in describing the present specification and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction in which the respective constituent elements are described. Therefore, the present invention is not limited to the words described in the disclosure, and may be replaced as appropriate.
In this disclosure, the terms "mounted," "connected," and "connected" are to be construed broadly, unless otherwise specifically indicated and defined. For example, it may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intermediate members, or may be in communication with the interior of two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.
In this disclosure, "electrically connected" includes a case where constituent elements are connected together by an element having some electric action. The "element having a certain electric action" is not particularly limited as long as it can transmit and receive an electric signal between the constituent elements connected. Examples of the "element having some electric action" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.
In the present disclosure, "parallel" refers to a state in which two straight lines form an angle of-10 ° or more and 10 ° or less, and thus, a state in which the angle is-5 ° or more and 5 ° or less is also included. The term "perpendicular" refers to a state in which the angle formed by two straight lines is 80 ° or more and 100 ° or less, and thus includes a state in which the angle is 85 ° or more and 95 ° or less.
In this disclosure, "film" and "layer" may be interchanged. For example, the "conductive layer" may be sometimes replaced with a "conductive film". In the same manner, the "insulating film" may be replaced with the "insulating layer" in some cases.
White light with different color temperatures and different proportions can be obtained by mixing the white light with different color temperatures. The color coordinates (x, y) of the light obtained by mixing the light having the color coordinates (x 1, y 1) and the light having the color coordinates (x 2, y 2) are as follows:
x= (x 1-x 2) x1 duty cycle +x2
y= (y 1-y 2) y1 duty cycle +y2
FIG. 1 is a schematic diagram of a chromatograph. As shown in fig. 1, the color temperature of the point a is 2000K, the color coordinate is (0.46,0.41), the color temperature of the point D is 6500K, the color coordinate is (0.31, 0.33), and white light with different color temperatures can be obtained by mixing light corresponding to the point a and light corresponding to the point D in different proportions. For example, when light having a color temperature of 5000K and a color coordinate of (0.346,0.349) is obtained, it is known from the above formula that the light ratio corresponding to the point a is 24%, and the light ratio corresponding to the point D is 76%, that is, x= (0.46-0.31) ×24++0.31=0.346, and y= (0.41-0.33) ×24++0.33=0.349.
Based on this, the embodiment of the disclosure provides a light-emitting substrate, a white light-emitting functional layer (which may be a stacked layer structure) may be evaporated between the cathode and the anode, and the light emitted by the white light-emitting functional layer is divided into two parts by using the color conversion layer, and the two parts of light with different intensities are mixed to obtain light with different color temperatures.
Fig. 2 is a schematic diagram of a light-emitting substrate according to an exemplary embodiment. As shown in fig. 2, the light emitting substrate provided in this embodiment includes a base 9, at least one first light emitting device 100 and at least one second light emitting device 200 disposed on the base 9, the first light emitting device 100 including: a first electrode 10 and a second electrode 11 disposed in this order along a direction perpendicular to the substrate 9, and a first light-emitting functional layer 12 disposed between the first electrode 10 and the second electrode 11; the second light emitting device 200 includes: a third electrode 13 and a fourth electrode 14 sequentially arranged along a direction perpendicular to the substrate 9, a second light emitting function layer 15 arranged between the third electrode 13 and the fourth electrode 14, and a color conversion layer 16 arranged on a light emitting side of the second light emitting function layer 15, wherein an orthographic projection of the color conversion layer 16 on the substrate 9 overlaps an orthographic projection of the second light emitting function layer 15 on the substrate 9.
According to the scheme provided by the embodiment, the color conversion layer is arranged, light emitted by the second light-emitting functional layer is converted into light with different color temperatures from light emitted by the first light-emitting device, the light with the two color temperatures is mixed to obtain light with other color temperatures, and when the intensity of the light with the two color temperatures is changed, the light with the different color temperatures can be output, so that the color temperature requirement is met.
In an exemplary embodiment, the first light emitting functional layer 12 and the second light emitting functional layer 15 may be light emitting functional layers that emit the same white light. The same white light is white light of the same color temperature. In an exemplary embodiment, the first light emitting functional layer 12 and the second light emitting functional layer 15 may be provided in the same layer, and manufactured through a one-time manufacturing process using the same material.
As shown in fig. 3, the light emitted by the first light emitting device 100 may be cool white light shown in fig. 3 (a), the light emitted by the second light emitting functional layer of the second light emitting device 200 may be cool white light shown in fig. 3 (b) (corresponding to fig. 3 (a)), and the light is converted into warm white light shown in fig. 3 (c) by the color conversion layer, that is, the light emitted by the second light emitting device 200 is warm white light shown in fig. 3 (c), and the light emitted by the first light emitting device 100 and the light emitted by the second light emitting device 200 are mixed to obtain the light shown in fig. 3 (d). The light shown in the (d) diagram of fig. 3 is only an example, and when the intensities of the light emitted from the first light emitting device 100 and the light emitted from the second light emitting device 200 are changed, the color temperature of the mixed light is changed accordingly. In addition, the first light emitting functional layer and the second light emitting functional layer shown in fig. 3 emit cool white light only as an example, for example, the first light emitting functional layer and the second light emitting functional layer may emit warm white light, and so on.
In some embodiments, as shown in fig. 2, the first electrode 10 and the third electrode 13 may be anodes, and in this case, the second electrode 11 and the fourth electrode 14 may be cathodes, and the first electrode 10 and the third electrode 13 may be independent of each other, i.e., different voltages may be applied to the first light emitting device 100 and the second light emitting device 200, respectively.
In an embodiment, the material of the anode may be selected from a high work function material such as ITO (Indium Tin Oxides, indium tin oxide), IZO (Indium Zinc Oxide ), tin dioxide (SnO 2), zinc oxide (ZnO), and other transparent conductive materials, and may also be a metal material such as silver (Ag) and its alloys, al (aluminum) and its alloys, or a composite material stacked by the above materials (such as Ag/ITO, al/ITO, ag/IZO, or Al/IZO, where "Ag/ITO" is named as a stacked structure of a metal silver electrode and an ITO electrode), and the material of the cathode may be selected from a low work function material such as lithium fluoride (LiF)/Al, metal Al, ag or magnesium (Mg), or a metal alloy material with a low work function (such as magnesium aluminum alloy, magnesium silver alloy), and the like.
In an exemplary embodiment, the light emitting substrate may be a bottom emission type light emitting substrate, light emitted from the first and second light emitting devices 100 and 200 may be emitted through the substrate 9 side, and the first and third electrodes 10 and 13 may be transparent anodes. However, the embodiment of the present disclosure is not limited thereto, and the light emitting substrate may be a top emission type light emitting substrate, and light emitted from the first and second light emitting devices 100 and 200 may be emitted through the second and fourth electrodes 11 and 14 side. In this embodiment, the light emitted from the first light emitting device 100 and the second light emitting device 200 is emitted through the substrate 9 side, and the color conversion layer 16 may be disposed on the second light emitting functional layer 15 side close to the substrate 9 side.
In an exemplary embodiment, the color conversion layer 16 may be disposed at a side of the substrate 9 remote from the second light emitting functional layer 15. As shown in fig. 2, the color conversion layer 16 may be attached to the substrate 9.
In an exemplary embodiment, the light emitting substrate may further include: the pixel defining layer 17 disposed on the substrate 9, the pixel defining layer 17 may define a plurality of openings, and the light emitting function layer of one light emitting device may be disposed in one opening. The pixel defining layer 17 may be disposed on the side of the first electrode 10 and the third electrode 13 away from the substrate 9. In an exemplary embodiment, the front projection of the opening of the light emitting functional layer of the second light emitting device 200 on the substrate is located in the front projection of the color conversion layer 16 of the second light emitting device 200 on the substrate. I.e. the light emitted by the second light emitting device 200 is converted by the color conversion layer 16.
In an exemplary embodiment, as shown in fig. 4, the color conversion layer 16 may be disposed between the substrate 9 and the third electrode 13. According to the scheme provided by the embodiment, the color conversion layer 16 is formed inside the substrate 9 (namely, one side of the substrate 9 close to the second light-emitting functional layer 15), and the color conversion layer 16 can be directly deposited on the substrate 9 without externally attaching a color conversion layer film, so that the yield is improved, and the service life is prolonged.
In an exemplary embodiment, the light emitting substrate may further include a scattering layer 19 disposed on the light emitting side of the first light emitting functional layer 12 and the second light emitting functional layer 15, where the front projection of the scattering layer 19 on the substrate 9 overlaps with the front projection of at least one of the first light emitting functional layers 12 on the substrate 9 and the front projection of at least one of the second light emitting functional layers 15 on the substrate 9. According to the scheme provided by the embodiment, the scattering layer is arranged to scatter emergent light, so that the light energy emitted by the first light emitting device 100 and the light energy emitted by the second light emitting device 200 are more uniformly mixed together, and a better illumination effect can be realized under a lower resolution (such as below 50ppi (pixel per inch). In addition, when the resolution is low, the pattern for preparing the luminous functional layer can be prepared without using a high-precision metal mask (the size of the opening of the mask is larger than 200 micrometers (um), and the accuracy can also be larger than 50 um), so that the cost is reduced. However, embodiments of the present disclosure are not limited thereto and a scattering layer may not be provided. In an exemplary embodiment, the front projection of the first light-emitting functional layer 12 onto the substrate 9 and the front projection of the second light-emitting functional layer 15 onto the substrate 9 are located within the front projection of the scattering layer 19 onto the substrate 9. That is, the scattering layer scatters light emitted from all the light emitting devices, thereby improving uniformity.
In an exemplary embodiment, the scattering layer 19 may be disposed on a side of the color conversion layer 16 away from the second light emitting functional layer 15, that is, the light is scattered after color conversion, so that the outgoing light is more uniform. However, the embodiment of the present disclosure is not limited thereto, and the diffusion layer 19 may be disposed at a side of the color conversion layer 16 near the second light emitting functional layer 15.
In an exemplary embodiment, as shown in fig. 5, the scattering layer 19 may be disposed on a side of the substrate 9 near the first light emitting functional layer 12 or the second light emitting functional layer 15. At this time, the scattering layer 19 may be coated on the substrate 9.
In an exemplary embodiment, as shown in fig. 6, the scattering layer 19 may be disposed on a side of the substrate 9 remote from the first light emitting functional layer 12 or the second light emitting functional layer 15. A scattering layer 19 may be attached to the substrate 9.
In an exemplary embodiment, the material of the scattering layer 19 may be a mixture of an organic material and a metal oxide. Such as a mixture of uv curable glue and silica particles.
The light emitting substrate may include a plurality of first light emitting devices 100 and a plurality of second light emitting devices 200, and the plurality of first light emitting devices 100 and the plurality of second light emitting devices 200 may be arranged in various ways, such as the first light emitting devices 100 and the second light emitting devices 200 may be uniformly spaced apart from each other, but not limited thereto.
Fig. 7 is a schematic plan view of a light-emitting substrate according to an exemplary embodiment. As shown in fig. 7, the light emitting substrate includes a plurality of first light emitting devices 100 and a plurality of second light emitting devices 200, the plurality of first light emitting devices 100 forming a plurality of columns of light emitting devices aligned in a first direction X, and each column of first light emitting devices 100 being aligned in a second direction Y, the plurality of second light emitting devices 200 forming a plurality of columns of light emitting devices aligned in the first direction X, and each column of second light emitting devices 200 being aligned in the second direction Y, and the columns formed by the first light emitting devices 100 being spaced apart from the columns formed by the second light emitting devices 200 along the first direction X, the first direction X and the second direction Y intersecting. In an exemplary embodiment, the first direction X and the second direction Y may be perpendicular to each other. The first electrodes 10 of the plurality of first light emitting devices 100 are electrically connected to the first pad 20, the third electrodes 13 of the plurality of second light emitting devices 200 are electrically connected to the second pad 30, the second electrodes 11 of the plurality of first light emitting devices 100 and the fourth electrodes 14 of the plurality of second light emitting devices 200 are electrically connected to the third pad 40, and the first pad 20, the second pad 30, and the third pad 40 are respectively connected to an external driving circuit. The second electrode 11 and the fourth electrode 14 may be full-face electrodes. In this embodiment, the first light emitting devices 100 in the same column may be provided with one first electrode 10, that is, one first electrode 10 provides a voltage for the first light emitting devices 100 in the same column, and the second light emitting devices 200 in the same column may be provided with one third electrode 13, that is, one third electrode 13 provides a voltage for the second light emitting devices 200 in the same column. According to the scheme provided by the embodiment, the first light-emitting devices with the same light color are connected in series by the lead and connected to the same bonding pad, and the second light-emitting devices with the other light color are connected in series by the lead and connected to the other bonding pad, so that the light-emitting devices corresponding to the two light colors can respectively apply different voltages to generate light with different intensities, the intensity ratio of the two light-emitting devices is changed, and the light colors with different color temperatures can be adjusted.
Fig. 8 is a schematic plan view of a light emitting substrate according to another exemplary embodiment. As shown in fig. 8, the light emitting substrate includes a plurality of first light emitting devices 100 and a plurality of second light emitting devices 200, the plurality of first light emitting devices 100 and the plurality of second light emitting devices 200 being disposed at intervals along a first direction X and at intervals along a second direction Y, the first direction X and the second direction Y intersecting. In an exemplary embodiment, the first direction X and the second direction Y may be perpendicular. In this embodiment, the first light emitting device 100 and the second light emitting device 200 are spaced apart from each other, so that the light is more uniform. The first electrodes 10 of the plurality of first light emitting devices 100 are electrically connected to and electrically connected to the first pad 20, the third electrodes 13 of the plurality of second light emitting devices 200 are electrically connected to and electrically connected to the second pad 30, the second electrodes 11 of the plurality of first light emitting devices 100 and the fourth electrodes 14 of the plurality of second light emitting devices 200 are electrically connected to and electrically connected to the third pad 40, and the first pad 20, the second pad 30, and the third pad 40 are respectively connected to an external driving circuit.
In an exemplary embodiment, the light emitting substrate may include a light emitting region and a frame region surrounding the light emitting region, the first and second light emitting devices 100 and 200 may be disposed at the light emitting region, the first, second and third pads 20, 30 and 40 may be disposed at the frame region, and the first pad 20 may be located at a first side of the light emitting region, and the second pad 30 may be located at a second side of the light emitting region, and the first and second sides are not adjacent; the third pad 40 may be disposed at third and fourth sides of the light emitting region, the third and fourth sides being opposite to each other and adjacent to the first and second sides.
The connection relationship between the light emitting devices (connection between the first electrodes 10 of the first light emitting device and connection between the third electrodes 13 of the second light emitting device 200) is described with three rows and four columns of light emitting devices as an example. In the present embodiment, the second light emitting device 201, the second light emitting device 202, and the second light emitting device 203 are electrically connected to the second pad 30, the second light emitting device 206 is electrically connected to the second light emitting device 201, the second light emitting device 204 is electrically connected to the second light emitting device 202, the second light emitting device 207 is electrically connected to the second light emitting device 204, the second light emitting device 205 is electrically connected to the second light emitting device 203, and the second light emitting device 208 is electrically connected to the second light emitting device 205; the first light emitting device 105, the first light emitting device 106, and the first light emitting device 107 are electrically connected to the first pad 20, the first light emitting device 101 is electrically connected to the first light emitting device 103, the first light emitting device 103 is electrically connected to the first light emitting device 106, the first light emitting device 102 is electrically connected to the first light emitting device 104, and the first light emitting device 104 is electrically connected to the first light emitting device 107. Wherein the third electrodes 13 of the plurality of second light emitting devices 200 may be connected through the trace 182, the first electrodes 10 of the plurality of first light emitting devices 100 may be connected through the trace 181, and the trace 181 and the trace 182 may be disposed between the substrate 9 and the pixel defining layer 17.
In an exemplary embodiment, the material of the color conversion layer 16 may include at least one of: perovskite, quantum dots, fluorescent materials, etc., as long as particles that facilitate conversion can be used for the color conversion layer 16.
In an exemplary embodiment, the substrate 9 may be, but is not limited to, a glass substrate.
In an exemplary embodiment, the first Light Emitting device may be an OLED (Organic Light-Emitting Diode) Light Emitting device, and in this case, the first Light Emitting functional layer and the second Light Emitting functional layer may include Organic Light Emitting layers. In other embodiments, the first light emitting device and the second light emitting device may be QLED (Quantum Dot Light Emitting Diodes, quantum dot light emitting diode) light emitting devices, and in this case, the first light emitting functional layer and the second light emitting functional layer may include a quantum dot light emitting layer.
In an exemplary embodiment, the light emitting substrate may be any one of self-luminous light emitting substrates such as an OLED light emitting substrate and a QLED light emitting substrate.
The embodiment of the disclosure provides a preparation method of a light-emitting substrate, which comprises the following steps:
forming at least one first light emitting device and at least one second light emitting device on a substrate, the first light emitting device comprising: a first electrode, a second electrode and a first light-emitting functional layer, wherein the first electrode and the second electrode are sequentially arranged along the direction vertical to the substrate; the second light emitting device includes: the light emitting device comprises a substrate, a third electrode, a fourth electrode, a second light emitting functional layer, a color conversion layer and a color conversion layer, wherein the third electrode and the fourth electrode are sequentially arranged along the direction perpendicular to the substrate, the second light emitting functional layer is arranged between the third electrode and the fourth electrode, the color conversion layer is arranged on the light emitting side of the second light emitting functional layer, and the front projection of the color conversion layer on the substrate is overlapped with the front projection of the second light emitting functional layer on the substrate.
According to the preparation method of the light-emitting substrate, part of light can be converted into light with another color temperature through the color conversion layer, the light with the two color temperatures is mixed to obtain the light with the other color temperatures, and the light with the different color temperatures is output along with the change of the intensity of the light with the two color temperatures, so that the color temperature requirement is met.
In an exemplary embodiment, the forming at least one first light emitting device and at least one second light emitting device includes:
depositing a first metal film on the substrate, and patterning to form a wiring pattern;
depositing a second metal film, and patterning to form a first electrode and a third electrode;
coating a pixel definition layer film, and forming a pixel definition layer pattern through a photoetching process;
sequentially evaporating an organic luminescent material and cathode metal on a substrate on which the patterns are formed to form a first luminescent functional layer, a second electrode and a fourth electrode pattern; the second electrode and the fourth electrode form a whole electrode;
and attaching a color conversion layer and a scattering layer on one side of the substrate far away from the first light-emitting functional layer and the second light-emitting functional layer.
In another embodiment, the forming at least one first light emitting device and at least one second light emitting device includes:
coating a scattering layer film on the substrate, and forming a scattering layer pattern through a photoetching process;
coating a color conversion layer film on a substrate with the structure, and forming a color conversion layer pattern through a photoetching process;
depositing a first metal film, and patterning to form a wiring pattern;
depositing a second metal film, and patterning to form a first electrode and a third electrode;
coating a pixel definition layer film, and forming a pixel definition layer pattern through a photoetching process;
sequentially evaporating an organic luminescent material and cathode metal on a substrate on which the patterns are formed to form a first luminescent functional layer, a second electrode and a fourth electrode pattern; the second electrode and the fourth electrode form a whole electrode.
The embodiments of the present disclosure provide a light emitting device including the light emitting substrate described in any of the embodiments above, but may also include other components, for example, a driving circuit for supplying an electrical signal to the light emitting substrate to drive the light emitting substrate to emit light, such as an IC (integrated circuit). The driving circuit is connected to the first pad 20, the second pad 30, and the third pad 40, respectively, and may supply different voltages to the first pad 20 and the second pad 30.
The light emitting device may be an illumination device, for example, a backlight module in a liquid crystal display device, a lamp (e.g., a car lamp) for internal or external illumination, or various signal lamps, etc.
Although the embodiments of the present invention are described above, the embodiments are only used for facilitating understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is to be determined by the appended claims.
Claims (11)
1. A light-emitting substrate, comprising: a substrate, at least one first light emitting device and at least one second light emitting device disposed on the substrate, the first light emitting device comprising: a first electrode, a second electrode and a first light-emitting functional layer, wherein the first electrode and the second electrode are sequentially arranged along the direction vertical to the substrate; the second light emitting device includes: the light emitting device comprises a substrate, a third electrode, a fourth electrode, a second light emitting functional layer and a color conversion layer, wherein the third electrode and the fourth electrode are sequentially arranged along the direction perpendicular to the substrate, the second light emitting functional layer is arranged between the third electrode and the fourth electrode, the color conversion layer is arranged on the light emitting side of the second light emitting functional layer, the front projection of the substrate by the color conversion layer is overlapped with the front projection of the second light emitting functional layer on the substrate, the color conversion layer is configured to convert light emitted by the second light emitting functional layer into light with different color temperatures from light emitted by a first light emitting device, the light with two color temperatures is mixed to obtain light with other color temperatures, and when the intensity of the light with the two color temperatures is changed, the light with different color temperatures is output.
2. The light-emitting substrate according to claim 1, wherein the first light-emitting functional layer and the second light-emitting functional layer are light-emitting functional layers that emit the same white light.
3. The light-emitting substrate according to claim 1, wherein the color conversion layer is provided on a side of the base away from the second light-emitting functional layer.
4. The light-emitting substrate according to claim 1, wherein the color conversion layer is provided between the base and the third electrode.
5. The light-emitting substrate according to claim 1, further comprising a scattering layer provided on a light-emitting side of the first light-emitting functional layer and the second light-emitting functional layer, wherein an orthographic projection of the scattering layer on the base overlaps with an orthographic projection of at least one of the first light-emitting functional layers on the base and an orthographic projection of at least one of the second light-emitting functional layers on the base.
6. The light-emitting substrate according to claim 5, wherein the scattering layer is provided on a side of the color conversion layer away from the second light-emitting functional layer.
7. The light-emitting substrate according to any one of claims 1 to 6, wherein the light-emitting substrate comprises a plurality of first light-emitting devices and a plurality of second light-emitting devices, the plurality of first light-emitting devices forming a plurality of columns of light-emitting devices arranged in a first direction and each column of first light-emitting devices being arranged in a second direction, the plurality of second light-emitting devices forming a plurality of columns of light-emitting devices arranged in the first direction and each column of second light-emitting devices being arranged in the second direction, and the columns formed by the first light-emitting devices and the columns formed by the second light-emitting devices being arranged at intervals in the first direction, the first direction and the second direction intersecting.
8. The light-emitting substrate according to any one of claims 1 to 6, wherein the light-emitting substrate comprises a plurality of first light-emitting devices and a plurality of second light-emitting devices, the plurality of first light-emitting devices and the plurality of second light-emitting devices being arranged at intervals along a first direction and at intervals along a second direction, the first direction and the second direction intersecting.
9. The light-emitting substrate according to any one of claims 1 to 6, wherein the light-emitting substrate comprises a plurality of first light-emitting devices and a plurality of second light-emitting devices, first electrodes of the plurality of first light-emitting devices are electrically connected to the first pad, third electrodes of the plurality of second light-emitting devices are electrically connected to the second pad, and second electrodes of the plurality of first light-emitting devices are electrically connected to fourth electrodes of the plurality of second light-emitting devices.
10. The light-emitting substrate according to any one of claims 1 to 6, wherein a material of the color conversion layer comprises at least one of: quantum dots, perovskite, fluorescent materials.
11. A light-emitting device comprising the light-emitting substrate according to any one of claims 1 to 10.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111370458A (en) * | 2020-03-20 | 2020-07-03 | 京东方科技集团股份有限公司 | Display substrate, preparation method thereof and display device |
| CN111785744A (en) * | 2020-08-27 | 2020-10-16 | 京东方科技集团股份有限公司 | OLED display panel, preparation method thereof and display device |
| CN113241416A (en) * | 2021-04-28 | 2021-08-10 | 合肥鑫晟光电科技有限公司 | Light-emitting substrate, preparation method thereof and light-emitting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111370458A (en) * | 2020-03-20 | 2020-07-03 | 京东方科技集团股份有限公司 | Display substrate, preparation method thereof and display device |
| CN111785744A (en) * | 2020-08-27 | 2020-10-16 | 京东方科技集团股份有限公司 | OLED display panel, preparation method thereof and display device |
| CN113241416A (en) * | 2021-04-28 | 2021-08-10 | 合肥鑫晟光电科技有限公司 | Light-emitting substrate, preparation method thereof and light-emitting device |
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