Light-emitting device, preparation method therefor and display panel

Abstract

The present disclosure relates to the technical field of display, and provides a light-emitting device, a preparation method therefor and a display panel. The light-emitting device comprises: a substrate and a light-emitting layer arranged on one side of the substrate; a first polarizing layer, which is arranged on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer comprises a plurality of first polarizing units, each first polarizing unit comprises a first portion on the side far away from the light-emitting layer and a second portion on the side close to the light-emitting layer, and the first portion and the second portion have different cross-sectional shapes along a plane perpendicular to the substrate; and a second polarizing layer, the second polarizing layer comprising a polarizing sub-layer that is arranged on the side of the light-emitting layer away from the substrate, or arranged on the side of the light-emitting layer close to the substrate, the polarizing sub-layer comprising a plurality of second polarizing units, and the arrangement direction of the plurality of second polarizing units being different from that of the plurality of first polarizing units.

Description

Light-emitting device, manufacturing method thereof, and display panel

[0001] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on December 29, 2023, with application number 2023118732022 and titled “A light-emitting device, a method for preparing the same, and a display panel,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0002] The embodiments of the present disclosure relate to the field of display technology, and in particular, to a light-emitting device and a method for manufacturing the same, and a display panel. Background Art

[0003] LED (light-emitting diode) manufacturing is trending towards ever-increasing miniaturization. This has made it possible to fabricate display substrates using arrays of Micro LEDs (micro-LEDs) as pixels, a concept proposed in recent years. LEDs offer significant advantages in reliability and longevity over OLEDs (organic light-emitting diodes). Micro LED displays, as the next generation of advanced display technology, offer irreplaceable ultra-high brightness and a compact chip size. Therefore, Micro LED display technology is poised to surpass OLED in the future. Summary of the Invention

[0004] The embodiments of the present disclosure adopt the following technical solutions:

[0005] According to a first aspect of the present disclosure, a light-emitting device is provided, comprising:

[0006] a substrate, and a light-emitting layer disposed on one side of the substrate;

[0007] a first polarizing layer, the first polarizing layer being disposed on a side of the light-emitting layer close to the substrate, wherein the first polarizing layer comprises a plurality of first polarizing units, each of the first polarizing units comprising a first portion on a side away from the light-emitting layer and a second portion on a side close to the light-emitting layer, the first portion and the second portion having different cross-sectional shapes along a plane perpendicular to the substrate;

[0008] A second polarizing layer, wherein the second polarizing layer includes a polarizing sublayer, the polarizing sublayer is arranged on a side of the light-emitting layer away from the substrate, or the polarizing sublayer is arranged on a side of the light-emitting layer close to the substrate, the polarizing sublayer includes a plurality of second polarizing units, and the arrangement direction of the plurality of second polarizing units is different from that of the plurality of first polarizing units.

[0009] In an optional embodiment, the first polarizing layer includes:

[0010] a first grating, the first grating comprising a plurality of first polarizing units spaced apart along a first direction, the plurality of first polarizing units being disposed close to the light-emitting layer, and a gap being present between two adjacent first polarizing units;

[0011] A first filling layer is provided on a side of the first grating away from the light-emitting layer, and the first filling layer fills gaps between the plurality of first polarizing units.

[0012] In an optional embodiment, the first portion is configured to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the second portion is configured to reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

[0013] In an optional embodiment, the first portion includes a first side surface, a second side surface, and a third side surface that intersect with each other, and the first side surface and the side of the second portion away from the light-emitting layer are parallel to and in contact with each other; the second side surface and the third side surface are arranged opposite to each other, and the orthographic projections of the second side surface and the third side surface on the substrate are three parallel straight lines.

[0014] In an optional embodiment, the first portion includes a first side surface and a second curved surface, the first side surface and the side of the second portion away from the light-emitting layer are parallel to and contact each other; the second curved surface intersects with the opposite ends of the first side surface, and the second curved surface protrudes in a direction away from the second portion.

[0015] In an optional embodiment, the first portion includes a first side surface and multiple second side surfaces, the first side surface and the side of the second portion away from the light-emitting layer are parallel to and in contact with each other; two adjacent side surfaces among the multiple second side surfaces intersect and are arranged opposite to each other, and the orthographic projections of the multiple second side surfaces on the substrate are multiple straight lines.

[0016] In an optional embodiment, the second portion includes a fourth side surface, a fifth side surface, a sixth side surface and a seventh side surface, the fourth side surface and the fifth side surface are parallel to each other and opposite to each other, the sixth side surface and the seventh side surface are parallel to each other and opposite to each other, and the sixth side surface and the fourth side surface are perpendicular to each other; wherein, the fourth side surface or the sixth side surface and the first portion are parallel to each other and in contact with each other.

[0017] In an optional embodiment, the grating period width of the first grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the first polarizing unit along the first direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the first polarizing unit along the direction perpendicular to the first direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

[0018] In an optional embodiment, the material of the first part is a metal material, a dielectric material or a visible light absorbing material; the material of the second part is a metal material or a dielectric material.

[0019] In an optional embodiment, the second polarizing layer further includes a reflective sublayer, which is arranged on a side of the light-emitting layer facing away from the substrate; the second polarizing layer is configured to modulate the phase of the light to achieve mutual conversion between the second type of polarized light and the first type of polarized light.

[0020] In an optional embodiment, the polarizing layer includes:

[0021] a second grating comprising a plurality of second polarizing units spaced apart along a second direction, the plurality of second polarizing units being disposed close to the light-emitting layer, with a gap between two adjacent second polarizing units, the second direction intersecting with the first direction, the first direction being the direction in which the plurality of first polarizing units are arranged;

[0022] A second filling layer is provided on a side of the second grating away from the light-emitting layer, and the second filling layer fills gaps between the plurality of second polarizing units.

[0023] In an optional embodiment,

[0024] The second polarizing unit is configured to reflect a first component of the first type of polarized light, a first component of the second type of polarized light, and at least one of the first component of the first type of polarized light and the first component of the second type of polarized light, and transmit a second component of the first type of polarized light, a second component of the second type of polarized light, and at least one of the second component of the first type of polarized light and the second component of the second type of polarized light;

[0025] The reflective sublayer is configured to reflect a first component and a second component of the first type of polarized light and / or a second type of polarized light.

[0026] In an optional embodiment, the grating period width of the second grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the second polarizing unit along the second direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the second polarizing unit along the direction perpendicular to the second direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

[0027] In an optional embodiment, the light-emitting device further includes a filter layer, which is arranged between the first polarizing layer and the light-emitting layer, wherein the filter layer is a first filter layer or a second filter layer, and the first filter layer is a single-layer color film filter or a plasma resonance filter; the second filter layer includes two stacked reflective structures and a patterned layer arranged between the two reflective structures.

[0028] In an optional embodiment, each of the first polarizing units includes a plurality of first polarizing subunits spaced apart along the length direction of the first polarizing unit, the first polarizing subunits are columnar structures, and the orthographic projection of the first polarizing subunits on the substrate is polygonal or arc-shaped.

[0029] According to a second aspect of the present disclosure, a display panel is provided, comprising:

[0030] a substrate; and

[0031] A plurality of light-emitting devices as described in any one of the first aspects, wherein the plurality of light-emitting devices are arranged on one side of the substrate; wherein the plurality of light-emitting devices include a plurality of light-emitting devices emitting light of different colors.

[0032] In an optional embodiment, the grating parameters of the first polarizing layer and / or the second polarizing layer in the multiple light-emitting devices emitting light of different colors are different, and the grating parameters include at least one of the following: the number of polarizing units, the grating period width of the grating, the width of each polarizing unit along the arrangement direction of the polarizing units, and the width of each polarizing unit along the direction perpendicular to the arrangement direction of the polarizing units.

[0033] A third aspect of the present disclosure provides a method for preparing a light-emitting device, the method comprising:

[0034] providing a substrate;

[0035] forming a light-emitting layer on one side of the substrate;

[0036] forming a first polarizing layer on a side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, each of the first polarizing units includes a first portion on a side away from the light-emitting layer and a second portion on a side close to the light-emitting layer, and the first portion and the second portion have different cross-sectional shapes along a plane perpendicular to the substrate;

[0037] A second polarizing layer is formed, wherein the second polarizing layer includes a polarizing sublayer, the polarizing sublayer is arranged on a side of the light-emitting layer away from the substrate, or the polarizing sublayer is arranged on a side of the light-emitting layer close to the substrate, the polarizing sublayer includes a plurality of second polarizing units, and the arrangement direction of the plurality of second polarizing units is different from that of the plurality of first polarizing units.

[0038] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] FIG1 is a schematic diagram of a hierarchical structure of a light-emitting device according to an embodiment of the present disclosure;

[0041] FIG2 is an exemplary partial cross-sectional view of a first polarizing layer in a first grating according to an embodiment of the present disclosure, taken on a plane perpendicular to the substrate;

[0042] FIG3 is an example diagram of an orthographic projection of a first grating in a first polarizing layer on a substrate according to an embodiment of the present disclosure;

[0043] FIG4 is a schematic diagram showing the shapes of a first portion and a second portion of a first polarizing unit according to an embodiment of the present disclosure;

[0044] FIG5 is a schematic diagram showing the shapes of the first portion and the second portion of another first polarizing unit proposed in one embodiment of the present disclosure;

[0045] FIG6 a is a schematic diagram showing a cross section of a second portion of a first polarizing unit along a plane perpendicular to a substrate and grating parameters according to an embodiment of the present disclosure;

[0046] FIG6 b is a schematic diagram of a cross section of an elliptical composite pattern of a first polarizing unit along a plane perpendicular to the substrate and grating parameters according to an embodiment of the present disclosure;

[0047] FIG6 c is a schematic diagram showing a cross section of a triangular composite pattern of a first polarizing unit along a plane perpendicular to the substrate and grating parameters according to an embodiment of the present disclosure;

[0048] FIG6 d is a schematic diagram of a cross section of an irregular composite pattern of a first polarizing unit along a plane perpendicular to the substrate and grating parameters according to an embodiment of the present disclosure;

[0049] 6e is a schematic diagram of a cross section of an elliptical composite pattern along a plane perpendicular to the substrate and grating parameters when the first portion of the first polarizing unit according to an embodiment of the present disclosure is made of a visible light absorbing material;

[0050] FIG7 a is a schematic diagram of a component of an incident light polarization state incident along a right oblique direction according to an embodiment of the present disclosure;

[0051] FIG7 b is a schematic diagram of components of polarization states of light reflected by a second polarizing layer according to an embodiment of the present disclosure;

[0052] FIG8 is a schematic diagram of light path transmission of a light emitting device based on a first polarizing layer and a second polarizing layer according to an embodiment of the present disclosure;

[0053] FIG9 is a red light efficiency curve diagram of a light emitting device provided with a filter layer according to an embodiment of the present disclosure;

[0054] FIG10 is a schematic diagram of a hierarchical structure in which a first polarizing layer and a polarizing sub-layer are arranged on the same side of a substrate in a light-emitting device according to an embodiment of the present disclosure;

[0055] FIG11 is a schematic diagram of the orientation of a first grating and a second grating according to an embodiment of the present disclosure;

[0056] FIG12a is a graph showing the reflectivity and transmittance of different polarized lights of the second portion of the first polarizing unit in a red light-emitting device according to an embodiment of the present disclosure;

[0057] FIG12 b is a graph showing reflectance and transmittance curves of different polarized lights of a first portion of a first polarizing unit in a red light-emitting device according to an embodiment of the present disclosure;

[0058] FIG13 is a graph showing the polarization conversion efficiency of a second polarizing layer in a red light-emitting device according to an embodiment of the present disclosure;

[0059] FIG14 is an example diagram of gratings of light-emitting chips of different colors in an RGB display panel proposed in one embodiment of the present disclosure;

[0060] FIG15 is a flowchart of a grating parameter optimization design for light-emitting chips of different colors in an RGB display panel according to an embodiment of the present disclosure;

[0061] FIG16 is a schematic diagram of a second filter layer corresponding to an RGB light-emitting device of a display panel provided by an embodiment of the present disclosure;

[0062] FIG17 is a schematic diagram of the structure of the second filter layer corresponding to the RGB light-emitting devices of a display panel provided by an embodiment of the present disclosure;

[0063] FIG18a is a schematic diagram of a hierarchical structure of an annealing treatment performed on an electrode layer in a method for preparing a light-emitting device according to an embodiment of the present disclosure;

[0064] FIG18 b is a schematic diagram of a hierarchical structure of a second grating formed in a method for manufacturing a light-emitting device according to an embodiment of the present disclosure;

[0065] FIG18c is a schematic diagram of a hierarchical structure of a second filling layer formed in a method for preparing a light-emitting device according to an embodiment of the present disclosure;

[0066] FIG18d is a schematic diagram of a hierarchical structure of a reflective sublayer formed in a method for preparing a light-emitting device according to an embodiment of the present disclosure;

[0067] FIG18e is a schematic diagram of the hierarchical structure of forming a first polarizing layer on a bonding substrate in a method for preparing a light-emitting device according to an embodiment of the present disclosure;

[0068] FIG18f is a schematic diagram of the hierarchical structure of bonding between a bonding substrate and a light-emitting layer in a method for preparing a light-emitting device according to an embodiment of the present disclosure;

[0069] FIG19 is a schematic structural diagram of a first polarizing subunit according to an embodiment of the present disclosure.

[0070] Explanation of the accompanying reference numerals: 1. substrate; 11. underlay; 12. light-emitting layer; 121. buffer layer; 122. first semiconductor layer; 123. active layer; 124. second semiconductor layer; 13. first polarizing layer; 131. first polarizing unit; 1311. first part; 1312. second part; 131-1. first polarizing sub-unit; 132. first filling layer; 14. second polarizing layer; 141. polarizing sub-layer; 1411. second polarizing unit; 1412. second filling layer; 142. reflective sub-layer; 15. electrode layer; 16. bonding substrate; 17. bonding adhesive layer. Specific embodiments

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0072] LED (light-emitting diode) manufacturing is trending towards ever-increasing miniaturization. This has made it possible to fabricate display substrates using arrays of Micro LEDs (micro-LEDs) as pixels, a concept proposed in recent years. LEDs offer significant advantages in reliability and longevity over OLEDs (organic light-emitting diodes). Micro LED displays, as the next generation of advanced display technology, offer irreplaceable ultra-high brightness and a compact chip size. Therefore, Micro LED display technology is poised to surpass OLED in the future.

[0073] In the related art, the bottom of the existing Micro LED device is a flat metal electrode, which faces the problem of reduced ambient contrast due to ambient light reflection. In order to obtain high ambient contrast in small-size pixel Micro LED display devices, a circular polarizer is generally set on the top of the display device to suppress the reflection of ambient light on the metal at the bottom of the Micro LED device. However, although the setting of the circular polarizer can reduce the reflectivity of ambient light, it will lead to reduced luminous efficiency and increased power consumption of the Micro LED display device. In addition, the process is complex and the integration is low, requiring multiple alignment and bonding. In addition, the working bandwidth of the circular polarizer is limited, and RGB patterning cannot be achieved, resulting in a decrease in contrast. Therefore, how to effectively reduce the reflectivity of ambient light while improving the luminous efficiency of the device has become an urgent problem to be solved in this field.

[0074] In view of this, an embodiment of the present disclosure proposes a light-emitting device. Figure 1 schematically shows a hierarchical structure diagram of a light-emitting device. As shown in Figure 1, the light-emitting device includes: a substrate 11; a light-emitting layer 12, wherein the light-emitting layer 12 is arranged on one side of the substrate 11; a first polarizing layer 13, wherein the first polarizing layer 13 is arranged on a side of the light-emitting layer 12 close to the substrate 11, and the first polarizing layer 13 and the light-emitting layer 12 are respectively arranged on opposite sides of the substrate 11.

[0075] In the embodiment of the present disclosure, the first polarizing layer 13 exhibits asymmetric optical polarization characteristics, and the optical polarization characteristics of the first polarizing layer 13 for ambient light incident from the outside and the spontaneous light emitted by the light-emitting layer 12 are different. Specifically, the ambient light incident from the outside and the spontaneous light emitted by the light-emitting layer 12 respectively reach opposite sides of the first polarizing layer 13. When the light-emitting device is irradiated by ambient light, the ambient light is incident from the side of the first polarizing layer 13 away from the light-emitting layer 12, and the spontaneous light emitted by the light-emitting layer 12 is incident from the side of the first polarizing layer 13 closer to the light-emitting layer 12. Therefore, in the embodiment of the present disclosure, the optical polarization characteristics of the side of the first polarizing layer 13 closer to the light-emitting layer 12 are different from the optical polarization characteristics of the side farther from the light-emitting layer 12.

[0076] In the embodiment of the present disclosure, the side of the first polarizing layer 13 adjacent to the light-emitting layer 12 is configured to reflect the second type of polarized light in the light emitted by the light-emitting layer 12 and transmit the first type of polarized light in the light emitted by the light-emitting layer 12. Since the self-luminous light is a light containing both the first type of polarized light and the second type of polarized light, the first polarizing layer 13 is located on the light-emitting side of the light-emitting device. The light emitted by the light-emitting device provided in the embodiment of the present disclosure needs to be modulated into the first type of polarized light with a uniform polarization state. When the self-luminous light reaches the first polarizing layer 13, it must first be modulated into the first type of polarized light by the hierarchical structure provided in the light-emitting device in the embodiment of the present disclosure before being emitted, thereby ensuring the image quality of the emitted light. Therefore, the embodiment of the present disclosure configures the first polarizing layer 13 on the side close to the light-emitting layer 12 to transmit the first type of polarized light in the light emitted by the light-emitting layer 12, and at the same time reflect the second type of polarized light in the light emitted by the light-emitting layer 12. When the spontaneous light reaches the first polarizing layer 13, the first type of polarized light in the spontaneous light is emitted from the light-emitting device, and the second type of polarized light in the spontaneous light is reflected back into the light-emitting device. The phase of the second type of polarized light is modulated into the first type of polarized light through the internal polarization hierarchical structure and then emitted from the first polarizing layer 13, thereby ensuring that the phase of the light emitted by the light-emitting device is uniform while enhancing the light effect of the emitted light.

[0077] In the disclosed embodiment, the side of the first polarizing layer 13 away from the light-emitting layer 12 is configured to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light. The ambient light incident from the outside is the same as the spontaneous light, also containing the first type of polarized light and the second type of polarized light. However, the ambient light is incident from the side of the first polarizing layer 13 away from the light-emitting layer 12. This ambient light will be reflected by the hierarchical structure located on the light-emitting side of the light-emitting device. If the ambient light reflectivity is high, the reflected ambient light will mix with the first type of polarized light emitted from the first polarizing layer 13, thereby reducing the contrast of the light-emitting device. In the embodiment of the present disclosure, the first polarizing layer 13 is arranged on a side away from the light-emitting layer 12 to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light. When the ambient light reaches the light-emitting side of the first polarizing layer 13, the first type of polarized light in the ambient light enters the interior of the light-emitting device and is emitted from the first polarizing layer 13 through reflection by the polarizing hierarchical structure in the light-emitting device, thereby realizing the use of the first type of polarized light in the ambient light to improve the light efficiency of the output light of the light-emitting device; at the same time, the second type of polarized light in the ambient light is repeatedly oscillated and absorbed by the first polarizing layer 13, reducing the reflection of the second type of polarized light in the first polarizing layer 13, thereby effectively reducing the reflectivity of the ambient light, ensuring that the second type of polarized light in the ambient light has a smaller proportion in the output first type of polarized light, thereby avoiding poor display caused by a decrease in the contrast of the output light.

[0078] In an optional embodiment, the asymmetric optical polarization characteristics of the first polarizing layer 13 are realized based on the internal structure of the first polarizing layer 13. As shown in FIG1 , the first polarizing layer 13 includes: a first grating, the first grating includes a plurality of first polarizing units 131, the plurality of first polarizing units 131 are arranged close to the light-emitting layer 12, there is a gap between two adjacent first polarizing units 131, and the plurality of first polarizing units 131 are periodically arranged along the first direction to form the first grating. Specifically, FIG2 shows an example diagram of a local cross-section of the first polarizing layer in the first grating proposed in an embodiment of the present disclosure on a plane perpendicular to the substrate. As shown in FIG2 , the first polarizing unit 131 includes a first portion 1311 and a second portion 1312, the first portion 1311 is arranged on a side away from the light-emitting layer 12 (i.e., close to the ambient light side), and the second portion 1312 is arranged close to the light-emitting layer 12. The cross-sectional shapes of the first portion 1311 and the second portion 1312 along the plane perpendicular to the substrate 11 are different. Based on each first polarizing unit The first portion 1311 and the second portion 1312 of the first polarizing element 131 have different shapes on either side, so that light reaching the first portion 1311 and the light reaching the second portion 1312 of the first polarizing element 131 achieve different forms of optical polarization. Specifically, the first portion 1311 is configured to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the second portion is configured to reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer. Taking Figure 2 as an example, the cross-sectional shape of the first portion 1311 along a plane perpendicular to the substrate 11 is triangular, and the cross-sectional shape of the second portion 1312 along a plane perpendicular to the substrate 11 is rectangular. It should be noted that the cross-sectional shapes of the first portion 1311 and the second portion 1312 in Figure 2 are merely optional configurations provided to facilitate a better understanding for those skilled in the art. The specific cross-sectional shapes of the first portion 1311 and the second portion 1312 can be determined based on actual conditions.

[0079] In the embodiment of the present disclosure, the first portion 1311 is used to enhance the optical path of the second type of polarized light in the ambient light within the first portion 1311, so that the second type of polarized light in the ambient light is absorbed after repeated oscillations within the first portion 1311, thereby reducing the second type of polarized light being absorbed rather than reflected when the ambient light enters the first portion 1311 of the first polarizing unit 131, thereby reducing the reflectivity of the ambient light, increasing the proportion of ambient light in the light emitted by the first polarizing layer 13, and improving the display effect. In an optional embodiment, the first portion 1311 includes a first side surface and multiple second side surfaces, the first side surface and the side of the second portion 1312 away from the light-emitting layer are parallel to each other and contact each other; adjacent two side surfaces of the multiple second side surfaces intersect and are arranged opposite to each other, and the orthographic projections of the multiple second side surfaces on the substrate are multiple straight lines. In this case, the cross-sectional shape of the first portion 1311 along a plane perpendicular to the substrate 11 is a triangle. The second portion 1312 includes a fourth side, a fifth side, a sixth side and a seventh side, the fourth side and the fifth side are parallel to each other and opposite to each other, the sixth side and the seventh side are parallel to each other and opposite to each other, and the sixth side and the fourth side are perpendicular to each other; wherein, the fourth side or the sixth side is parallel to and in contact with the first portion, and at this time, the cross-sectional shape of the second portion 1312 along the plane perpendicular to the substrate 11 is a rectangle, and the cross-sectional shape of the first polarizing unit 131 along the plane perpendicular to the substrate 11 is a composite figure of a triangle and a rectangle.

[0080] For example, Figure 3 shows an example diagram of the orthographic projection of the first grating in the first polarizing layer proposed in an embodiment of the present disclosure on the substrate, and Figure 4 shows a schematic diagram of the shape of the first part and the second part of a first polarizing unit proposed in an embodiment of the present disclosure. As shown in Figures 3 and 4, the first part 1311 includes a first side surface ACDF, a second side surface BCEF and a third side surface ABDE that intersect with each other, and the first side surface ACDF and the second part 1312 are parallel to and in contact with each other on the side away from the light-emitting layer 13; the second side surface BCEF and the third side surface ABDE are arranged opposite to each other, and the orthographic projections of the second side surface BCEF and the third side surface ABDE on the substrate 11 are three parallel straight lines (i.e., straight line AD, straight line BE, and straight line FC). The second part 1312 includes a fourth side surface ACDF, a fifth side surface HIJK, a sixth side surface AHDG and a seventh side surface CFIK. The fourth side surface ACDF and the fifth side surface HIJK are parallel to each other and are opposite to each other. The sixth side surface AHDG and the seventh side surface CFIK are parallel to each other and are opposite to each other. The sixth side surface AHDG and the fourth side surface ACDF are perpendicular to each other. The fourth side surface ACDF and the first part 1311 are parallel to each other and contact each other.

[0081] In an optional embodiment, Figure 5 shows a schematic diagram of the shape of the first part and the second part of another first polarizing unit proposed in an embodiment of the present disclosure. As shown in Figure 5, the first part 1311 includes a first side surface and a second curved surface, and the first side surface and the second part 1312 are parallel to and in contact with each other on the side away from the light-emitting layer; the second curved surface intersects with the opposite ends of the first side surface, and the second curved surface protrudes in a direction away from the second part 1312. At this time, the cross-sectional shape of the first part 1311 along the plane perpendicular to the substrate 11 is an arc. The second portion 1312 includes a fourth side, a fifth side, a sixth side and a seventh side, the fourth side and the fifth side are parallel to each other and opposite to each other, the sixth side and the seventh side are parallel to each other and opposite to each other, and the sixth side and the fourth side are perpendicular to each other; wherein, the fourth side or the sixth side is parallel to and in contact with the first portion, and at this time, the cross-sectional shape of the second portion 1312 along the plane perpendicular to the substrate 11 is a rectangle, and the cross-sectional shape of the first polarizing unit 131 along the plane perpendicular to the substrate 11 is a composite figure of an arc and a rectangle (such as the elliptical composite figure shown in Figure 5).

[0082] In an optional embodiment, Figure 6d shows a cross-section of an irregular composite figure of the first polarizing unit proposed in an embodiment of the present disclosure along a plane perpendicular to the substrate and a schematic diagram of grating parameters. As shown in Figure 6d, the first portion 1311 includes a first side surface and multiple second side surfaces, and the first side surface and the second portion 1312 are parallel to and in contact with each other on the side away from the light-emitting layer; two adjacent side surfaces among the multiple second side surfaces intersect and are arranged relative to each other, and the positive projections of the multiple second side surfaces on the substrate are multiple straight lines, and any two straight lines may be parallel or non-parallel. At this time, the cross-sectional shape of the first portion 1311 along a plane perpendicular to the substrate 11 is an irregular polygonal broken line figure. The second portion 1312 includes a fourth side, a fifth side, a sixth side and a seventh side, the fourth side and the fifth side are parallel to each other and opposite to each other, the sixth side and the seventh side are parallel to each other and opposite to each other, and the sixth side and the fourth side are perpendicular to each other; wherein, the fourth side or the sixth side is parallel to and in contact with the first portion, and at this time, the cross-sectional shape of the second portion 1312 along the plane perpendicular to the substrate 11 is a rectangle, and the cross-sectional shape of the first polarizing unit 131 along the plane perpendicular to the substrate 11 is a composite figure of an irregular polygonal broken line figure and a rectangle.

[0083] It should be noted that, in the embodiment of the present disclosure, the cross-sectional shape of the first portion 1311 perpendicular to the substrate 11 can be other regular or irregular composite shapes, as long as the shape of the first portion 1311 can transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; and the shape of the second portion can reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

[0084] In an optional embodiment, the first grating can be any one of a single-layer metal wire grating, a single-layer dielectric wire grating, a double-layer metal wire grating, a double-layer dielectric wire grating, and a hybrid metal / dielectric grating. The first portion 1311 of the first polarizing unit 131 is made of a metal material, a dielectric material, or a visible light absorbing material; and the second portion 1312 is made of a metal material or a dielectric material. For example, the metal material can be silver, aluminum, or gold, and the dielectric material can be silicon nitride, silicon oxide, titanium oxide, gallium nitride, or gallium phosphide. In addition, Figure 6e shows the cross-section of an elliptical composite figure along a plane perpendicular to the substrate and a schematic diagram of grating parameters when the first part of the first polarizing unit proposed in an embodiment of the present disclosure is a visible light absorbing material. As shown in Figure 6e, when the first part 1311 is a visible light absorbing material, the absorption of the second type of polarized light in the ambient light by the first part 1311 can be directly achieved through the characteristics of the visible light absorbing material. At this time, the shape of the cross-section of the first part 1311 along the plane perpendicular to the substrate can be the same as the first part 1311 of other materials, or it can be other conventional shapes (a rectangle as shown in Figure 6e), and the present disclosure does not impose any restrictions on this.

[0085] For a grating, the optical polarization characteristics of the grating are influenced by setting different grating parameters. The grating parameters include at least one of the following: the number of polarizers, the grating period width (the width of the normal line between two adjacent polarizers in the grating along the polarizer arrangement direction), the width of each polarizer along the polarizer arrangement direction, and the width of each polarizer along a direction perpendicular to the polarizer arrangement direction. In the disclosed embodiment, to ensure the asymmetric optical polarization characteristics of the first grating, the grating parameters of the first grating need to be restricted. Specifically, Figure 6a shows a cross-section of the second part of the first polarizing unit along the perpendicular substrate plane and a schematic diagram of the grating parameters proposed in an embodiment of the present disclosure, Figure 6b shows a cross-section of an elliptical composite figure of the first polarizing unit along the perpendicular substrate plane and a schematic diagram of the grating parameters proposed in an embodiment of the present disclosure, Figure 6c shows a cross-section of a triangular composite figure of the first polarizing unit along the perpendicular substrate plane and a schematic diagram of the grating parameters proposed in an embodiment of the present disclosure, as shown in Figures 6a-6c, the grating period width P of the first grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the first polarizing unit 131 along the first direction (that is, the line width of the first grating) a is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the first polarizing unit 131 along the first direction perpendicular to the first direction (that is, the height H of each first polarizing unit, as shown in Figures 6b and 6c, the height H of the first polarization is the height H of the first part 1311 s and the height H of the second portion 1312 t The sum of the parameters (inclusive of the sum of the parameters) is greater than or equal to 0.01 μm and less than or equal to 10 μm. The first grating within the grating parameter range limited by the above-mentioned range can cause the second type of polarized light in the incident ambient light to repeatedly oscillate on the structural sidewalls of the first portion 1311 and thereby be absorbed, thereby suppressing the reflection of the ambient light in the first polarizing layer. At the same time, it can avoid high-order diffraction, effectively improving the light efficiency of the light emitted from the first polarizing layer 13.

[0086] In the embodiment of the present disclosure, the first polarizing layer 131 further includes a first filling layer 132, which is arranged on the side of the first grating away from the light-emitting layer 12, and the first filling layer 132 fills the gaps between the multiple first polarizing units 131. The first filling layer 132 is used to ensure that the light entering the first polarizing layer 13 has a sufficient transmission distance. Furthermore, the refractive index of the first filling layer is greater than or equal to 1.42 and less than or equal to 1.48. On the other hand, due to the provision of the first filling layer 132, the aspect ratio of the first polarizing unit 131 can be reduced. The first polarizing unit 131 with a smaller aspect ratio can reduce the difficulty of preparing the first polarizing unit 131, while reducing the light scattering and absorption problems caused by the roughness of the sidewalls of the first polarizing unit 131, effectively improving the light efficiency of the light passing through the first grating. Preferably, the material of the first filling layer 132 can be silicon nitride, silicon oxide, titanium oxide, gallium nitride, gallium phosphide, etc.

[0087] In the embodiment of the present disclosure, in order to make the light entering the light-emitting device be emitted from the light-emitting side of the first polarizing layer 13 in the form of the first type of polarized light, a second polarizing layer 14 is provided in the light-emitting device to achieve phase modulation of the light. The second polarizing layer 14 is configured to modulate the phase of the light to achieve mutual conversion between the second type of polarized light and the first type of polarized light, that is, when the second type of polarized light reaches the second polarizing layer 14, it will be reflected and converted into the first type of polarized light; when the first type of polarized light reaches the second polarizing layer 14, it will be reflected and converted into the second type of polarized light. The function of modulating the phase of the light of the second polarizing layer 14 is achieved by the polarizing sublayer 141 and the reflective sublayer 142 inside the second polarizing layer 14.

[0088] In an optional embodiment, as shown in FIG1 , the polarizing layer 141 is disposed on a side of the light-emitting layer 12 facing away from the substrate 11, and the reflecting sublayer 142 is disposed on a side of the light-emitting layer 12 facing away from the substrate 11. The polarizing layer 141 includes a second grating, which includes a plurality of second polarizing units 1411. The plurality of second polarizing units 1411 are disposed near the light-emitting layer 12, with gaps between adjacent second polarizing units 1411. The plurality of second polarizing units 1411 are periodically arranged along a second direction to form the second grating. Figure 11 shows a schematic diagram of the orientation of a first grating and a second grating proposed in an embodiment of the present disclosure. As shown in Figure 11, the second direction intersects with the first direction in which the first polarization unit 131 in the first grating is arranged, so that the orientations of the first polarization unit 131 and the second polarization unit 1411 are staggered at a certain angle, thereby enabling the light incident on the second grating to achieve a conversion of the polarization state, wherein the angle between the first direction and the second direction is greater than or equal to 30° and less than or equal to 60°. Preferably, the angle between the first direction and the second direction is 45°.

[0089] In addition, the polarizing layer 141 also includes a second filling layer 1412, which is disposed on a side of the second grating facing away from the light-emitting layer 12 and fills the gaps between the plurality of second polarizing units 1411. The second filling layer 1412 is used to ensure that light entering the second polarizing layer 14 has a sufficient transmission distance, that is, to determine the phase difference of the light during the polarization state conversion process in the second polarizing layer 14. Furthermore, the provision of the second filling layer 1412 allows a transparent medium of the second filling layer 1412 to exist between the second polarizing unit 1411 and the hierarchical structure facing away from the second polarizing unit 1411, thereby reducing the aspect ratio of the second polarizing unit 1411. A second polarizing unit 1411 with a smaller aspect ratio can reduce the difficulty of manufacturing the second polarizing unit 1411 and reduce light scattering and absorption caused by the roughness of the sidewalls of the second polarizing unit, effectively improving the optical efficiency of the light reflected by the second grating. For example, when the second polarizer 1411 is fabricated by etching, the amount of etching required to form the second polarizer 1411 can be effectively reduced; when the second polarizer 1411 is fabricated by filling, the difficulty of filling the second polarizer 1411 can be effectively reduced. Furthermore, the refractive index of the second filling layer 1412 is greater than or equal to 1.42 and less than or equal to 1.48. Preferably, the material of the second filling layer 1412 can be silicon nitride, silicon oxide, titanium oxide, gallium nitride, gallium phosphide, or the like.

[0090] Furthermore, the second polarizing unit 1411 is configured to reflect the first component of the first type of polarized light, the first component of the second type of polarized light, or at least one of the first component of the first type of polarized light and the first component of the second type of polarized light, and transmit the second component of the first type of polarized light, the second component of the second type of polarized light, or at least one of the second component of the first type of polarized light and the second component of the second type of polarized light. The reflective sublayer 142 is configured to reflect the first component and the second component of the first type of polarized light and / or the second type of polarized light. Figure 7a shows a schematic diagram of the components of the polarization state of an incident light incident along the right oblique direction proposed in an embodiment of the present disclosure, and Figure 7b shows a schematic diagram of the components of the polarization state of a light reflected by the second polarizing layer proposed in an embodiment of the present disclosure. As shown in Figure 7a, when the first type of polarized light and / or the second type of polarized light is incident on the second grating as the incident light, it is assumed that the polarization state of the incident light is incident along the right oblique direction, its first component is the TE mode in the positive x direction, and the second component is the TM mode in the positive y direction, the second polarizing unit 1411 in the second grating reflects the first component of the incident light and transmits the second component to reach the reflective sublayer 142. The second component reflected by the reflective sublayer 142 produces a phase difference of 180° with the first component reflected by the second polarizing unit 1411, resulting in a birefringence effect. At this time, the electric field is divided into the negative x direction and the positive y direction (as shown in Figure 7b), so that the vector sum of the first component and the second component reflected by the second polarizing layer 14 is orthogonal to the original electric field polarization state, realizing the conversion between orthogonal polarization states, which is manifested as the mutual conversion between the first type of polarized light and the second type of polarized light.

[0091] It should be noted that one of the first component and the second component is S-polarized light and the other is P-polarized light, that is, the first component is S-polarized light and the second component is P-polarized light, or the first component is P-polarized light and the second component is S-polarized light. The meaning of P-polarized light and S-polarized light is explained below. When light penetrates the surface of an optical element (such as a spectrometer) at a non-perpendicular angle, both the reflection and transmission characteristics depend on the polarization phenomenon. In this case, the coordinate system used is defined by the plane containing the input and reflected light beams. If the polarization vector of the light is in this plane, it is called P-polarized light; if the polarization vector is perpendicular to the plane, it is called S-polarized light.

[0092] In an optional embodiment, FIG10 shows a schematic diagram of the hierarchical structure of a light-emitting device proposed in an embodiment of the present disclosure, in which the first polarizing layer and the second polarizing layer are arranged on the same side of the substrate. As shown in FIG10 , the polarizing layer 141 is arranged on the side of the light-emitting layer 12 close to the substrate 11, the polarizing layer 141 is arranged between the first polarizing layer 13 and the substrate 11, the second grating in the polarizing layer 141 is arranged close to the side of the light-emitting layer 12, and the second filling layer 1412 in the polarizing layer 141 is arranged away from the side of the light-emitting layer 12. In this case, the first polarizing layer 13 and the polarizing layer 141 can be prepared using a single-sided process without changing the polarization performance of the light-emitting device, thereby simplifying the preparation process.

[0093] Figure 8 shows a schematic diagram of the light path transmission of a light-emitting device based on the first polarizing layer and the second polarizing layer. As shown in Figure 8, the horizontal double arrows represent the first type of polarized light, the vertical double arrows represent the second type of polarized light, the first layer of nanowire grid is the first polarizing layer 13 in the embodiment of the present disclosure, and the second layer of nanowire grid is the second polarizing layer 14 described in the embodiment of the present disclosure. The light-emitting layer 12 generates self-luminescence including a first type of polarized light and a second type of polarized light. The self-luminescence reaches the side of the first polarizing unit 131 in the first polarizing layer 14 close to the light-emitting layer 12. The second portion 1312 of the first polarizing unit 131 close to the light-emitting layer 12 is configured to transmit the first type of polarized light and reflect the second type of polarized light. Therefore, the first type of polarized light in the self-luminescence passes through the first polarizing layer 13 and is emitted. The second type of polarized light is reflected by the second portion 1312 in the first polarizing unit 131 and reaches the second polarizing layer 14. The second polarizing unit 1411 in the second polarizing layer 14 reflects the first component of the second type of polarized light and transmits the second component of the second type of polarized light to the reflective sublayer 142. The reflective sublayer 142 reflects the second component of the second type of polarized light. The two form a phase difference and are combined into the first type of polarized light. That is, the second type of polarized light is reflected by the phase conversion of the second polarizing layer 14 as the first type of polarized light and is emitted from the first polarizing layer 13.

[0094] The self-luminescence generated by the light-emitting layer 12 propagates toward the second polarizing layer 14, where the first type of polarized light and the second type of polarized light undergo phase conversion, respectively, and the reflected light is still the first type of polarized light and the second type of polarized light (i.e., it is still self-luminescence including the first type of polarized light and the second type of polarized light). The self-luminescence reflected by the second polarizing layer 14 reaches the side of the first polarizing unit 131 in the first polarizing layer 14 close to the light-emitting layer 12. The second portion 1312 of the first polarizing unit 131 close to the light-emitting layer 12 is configured to transmit the first type of polarized light and reflect the second type of polarized light. Therefore, the first type of polarized light in the self-luminescence passes through the first polarizing layer 13 and is emitted. The second type of polarized light is reflected by the second portion 1312 of the first polarizing unit 131 and reaches the second polarizing layer 14. It is then phase converted by the second polarizing layer 14 and reflected as the first type of polarized light, which is emitted from the first polarizing layer 13.

[0095] Ambient light is incident from outside the light-emitting device onto a side of the first polarizing layer 13 away from the light-emitting layer 12. The ambient light includes a first type of polarized light and a second type of polarized light. The first portion 1311 of the first polarizing unit 131 away from the light-emitting layer 12 is configured to transmit the first type of polarized light and absorb the second type of polarized light. Therefore, when the second type of polarized light in the ambient light enters the first portion 1311 of the first polarizing unit 131, it is absorbed by the first portion 1311 after repeated oscillations. The first type of polarized light in the ambient light passes through the first polarizing layer 13 and enters the light-emitting device and reaches the second polarizing layer 14. The first type of polarized light is phase-converted and reflected by the second polarizing layer 14 into the second type of polarized light and reaches the second portion 1312 of the first polarizing unit 131. The light is then reflected by the second portion 1312 back to the second polarizing layer 14. The light is then phase-converted and reflected by the second polarizing layer 14 into the first type of polarized light and emitted from the first polarizing layer 13.

[0096] In an optional embodiment, the second grating can be any one of a single-layer metal wire grating, a single-layer dielectric wire grating, a double-layer metal wire grating, a double-layer dielectric wire grating, and a hybrid metal / dielectric grating. The material of the second polarizing unit 1411 is a metal material, a dielectric material, or a visible light absorbing material. For example, the metal material can be silver, aluminum, or gold, and the dielectric material can be silicon nitride, silicon oxide, titanium oxide, gallium nitride, and gallium phosphide. Furthermore, the cross-section of the second polarizing unit 1411 along a plane perpendicular to the substrate 11 is rectangular.

[0097] In an optional embodiment, in order to ensure the optical polarization characteristics of the second grating, it is necessary to limit the grating parameters of the second grating. Specifically, the grating period width P of the second grating is greater than or equal to 0.1μm and less than or equal to 2μm; the width a of the second polarizing unit 1411 along the second direction (i.e., the line width of the first grating) is greater than or equal to 0.01μm and less than or equal to 1.8μm; the width of the second polarizing unit 1411 perpendicular to the second direction (i.e., the height of each second polarizing unit) is greater than or equal to 0.01μm and less than or equal to 10μm. The second grating within the grating parameters limited by the above range can reflect the first component of the first type of polarized light, the first component of the second type of polarized light, and at least one of the first component of the first type of polarized light and the first component of the second type of polarized light, and transmit the second component of the first type of polarized light, the second component of the second type of polarized light, and at least one of the second component of the first type of polarized light and the second component of the second type of polarized light.

[0098] In an optional embodiment, to further suppress reflection of ambient light, the light-emitting device further includes a filter layer, which is used to reduce two-thirds of the ambient light, thereby further reducing the ambient light reflectivity. Specifically, the filter layer is disposed between the first polarizing layer 13 and the light-emitting layer 12. The filter layer can be a first filter layer or a second filter layer, wherein the first filter layer is a single-layer color filter or a plasma resonance filter; the second filter layer includes two stacked reflective structures and a patterned layer disposed between the two reflective structures. Figure 9 shows a red light efficiency curve for a light-emitting device provided with a filter layer according to an embodiment of the present disclosure. As shown in Figure 9, for the light-emitting device provided with the filter layer, the self-luminous transmittance near 610nm red light is 68%, which is approximately 62% higher than the self-luminous transmittance of existing light-emitting devices (generally 42%). The ambient light reflectivity is 7%. Therefore, the light-emitting device provided in the embodiment of the present disclosure can effectively improve the light efficiency of the display panel while maintaining a low ambient light reflectivity.

[0099] In an optional embodiment, in order to further enhance the optical polarization effect of the first grating and / or the second grating, the first polarizing unit and / or the second polarizing unit in the embodiment of the present disclosure may be replaced by a one-dimensional wire grating structure with a two-dimensional grating structure. Specifically, taking the first polarizing unit as an example, FIG19 shows a schematic structural diagram of the first polarizing unit proposed in an embodiment of the present disclosure. As shown in FIG19 , each of the first polarizing units 131 includes a plurality of first polarizing units 131-1 spaced apart along the length direction of the first polarizing unit 131, that is, in the first grating, the first polarizing units 131-1 are arrayed to form a two-dimensional grating structure. Optionally, the first polarizing unit 131-1 is a columnar structure, and the orthographic projection of the first polarizing unit on the substrate 11 is a polygon or an arc. Exemplarily, the first polarizing unit 131-1 may be a rectangular prism (such as a quadrangular prism), a cylinder, an elliptical prism, etc.

[0100] In an optional embodiment, the light-emitting layer 12 includes: a buffer layer 121, the buffer layer 121 being disposed on a side close to the substrate 11; a first semiconductor layer 122, the first semiconductor layer 122 being disposed on a side of the buffer layer 121 facing away from the substrate 11; an active layer 123, the active layer 123 being disposed on a side of the first semiconductor layer 122 facing away from the substrate 11; and a second semiconductor layer 124, the second semiconductor layer 124 being disposed on a side of the active layer 123 facing away from the substrate 11, wherein one of the first semiconductor layer 122 and the second semiconductor layer 124 is an N-type semiconductor and the other is a P-type semiconductor. Preferably, the buffer layer 121 is a gallium nitride layer, the active layer 123 is an indium gallium nitride / gallium nitride quantum well layer, and one of the first semiconductor layer 121 and the second semiconductor layer 124 is an N-type gallium nitride layer and the other is a P-type gallium nitride layer.

[0101] In an optional embodiment, the light-emitting device further includes: an electrode layer 15, which is arranged between the second polarizing layer 14 and the light-emitting layer 12; a bonding substrate 16, which is arranged between the first polarizing layer 13 and the substrate 11; and a bonding adhesive layer 17, which is arranged between the bonding substrate 16 and the substrate 11.

[0102] In order to enable those skilled in the art to more clearly understand the solutions of the present disclosure, the light-emitting device described in the present disclosure will be described in detail through the following embodiments.

[0103] The embodiment of the present disclosure provides a red light-emitting device, which has the same structure as the light-emitting device described above in the embodiment of the present disclosure. The cross-sectional shape of the first polarizing unit 131 of the red light-emitting device along a plane perpendicular to the substrate 11 is a composite figure of a triangle and a rectangle. Specifically, the first portion 1311 of the first polarizing unit 131 includes a first side surface and a plurality of second side surfaces, wherein the first side surface and the second portion 1312 are parallel to and in contact with each other on a side away from the light-emitting layer; adjacent two side surfaces of the plurality of second side surfaces intersect and are arranged opposite to each other, and the orthographic projections of the plurality of second side surfaces on the substrate are a plurality of straight lines. In this case, the cross-sectional shape of the first portion 1311 along a plane perpendicular to the substrate 11 is a triangle. The second portion 1312 of the first polarizing unit 131 includes a fourth side, a fifth side, a sixth side and a seventh side, the fourth side and the fifth side are parallel to each other and opposite to each other, the sixth side and the seventh side are parallel to each other and opposite to each other, and the sixth side and the fourth side are perpendicular to each other; wherein the fourth side or the sixth side is parallel to and in contact with the first portion, and at this time, the cross-sectional shape of the second portion 1312 along a plane perpendicular to the substrate 11 is a rectangle.

[0104] The first grating of the red light-emitting device is a single-layer metal grating. The first portion 1311 and the second portion 1312 of the first polarizing unit 131 are made of silver. The refractive index of the first filling layer 132 is 1.46. The grating period width P of the first grating is 0.4 μm. The width a of the first polarizing unit 131 along the first direction (i.e., the line width of the first grating) is 0.2 μm. The height H of the first portion 1311 is 0. s is 0.24 μm, and the height H of the second portion 1312 is t0.05μm. Figure 12a shows a graph showing the reflectivity and transmittance of different polarized lights of the second portion of the first polarizing unit in a red light-emitting device proposed in one embodiment of the present disclosure, and Figure 12b shows a graph showing the reflectivity and transmittance of different polarized lights of the first portion of the first polarizing unit in a red light-emitting device proposed in one embodiment of the present disclosure. As shown in Figures 12a-12b, the first portion 1311 is close to the ambient light side (the side away from the light-emitting layer), which is the low-reflection side, corresponding to the graph showing the reflectivity and transmittance of different polarized lights incident on the low-reflection side shown in Figure 12b; the second portion 1312 is close to the light-emitting layer side, which is the high-reflection side, corresponding to the graph showing the reflectivity and transmittance of different polarized lights incident on the high-reflection side shown in Figure 12a. Among them, Ts_N is the transmittance of the first type of polarized light in self-luminescence, Rs_N is the reflectivity of the first type of polarized light in self-luminescence, Tp_N is the transmittance of the second type of polarized light in self-luminescence, Rp_N is the reflectivity of the second type of polarized light in self-luminescence, low-reflection side incidence, Ts_B is the transmittance of the first type of polarized light in ambient light, Rs_B is the reflectivity of the first type of polarized light in ambient light, Tp_B is the transmittance of the second type of polarized light in ambient light, Rp_B is the reflectivity of the second type of polarized light in ambient light. As can be seen from Figures 12a and 12b, in the first polarizing unit 131 of the red light-emitting device configured as described above, the reflectivity of the second type of polarized light in the ambient light in the first part 1311 thereof is significantly reduced near 610 nm in the red light wavelength range. Therefore, the first polarizing layer 13 of the red light-emitting device provided in the embodiment of the present disclosure exhibits an asymmetric optical polarization characteristic in which the side away from the light-emitting layer can transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the side of the first polarizing layer close to the light-emitting layer can reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

[0105] In the red light-emitting device provided by the embodiments of the present disclosure, the second grating is a single-layer metal grating, the second polarizing element 1411 is made of silver, the refractive index of the second filling layer 1412 is 1.46, the material of the second filling layer 1412 is BCB glue, the thickness of the second filling layer 1412 is 0.115 nm, and the material of the reflective sublayer 142 is silver. The grating period width P of the second grating is 0.3 μm; the width a of the second polarizing element 1411 along the second direction (i.e., the line width of the second grating) is 0.095 μm; and the width of the second polarizing element 1411 perpendicular to the second direction is 0.115 μm. Figure 13 shows a polarization conversion efficiency curve of the second polarizing layer in a red light-emitting device proposed in an embodiment of the present disclosure. As shown in Figure 13, the second polarizing layer 14 of the red light-emitting device configured according to the above-mentioned content has a polarization conversion efficiency between the first type of polarized light and the second type of polarized light higher than 0.8 near 610nm in the red light wavelength range. Therefore, the second polarizing layer 14 of the red light-emitting device provided by the embodiment of the present disclosure exhibits an optical polarization characteristic capable of modulating the phase of light to achieve mutual conversion between the second type of polarized light and the first type of polarized light.

[0106] The embodiment of the present disclosure provides a blue light-emitting device, which has the same structure as the light-emitting device described above in the embodiment of the present disclosure. The cross-sectional shape of the first polarizing unit 131 of the blue light-emitting device along the plane perpendicular to the substrate 11 is a composite figure of a triangle and a rectangle. Specifically, the first portion 1311 of the first polarizing unit 131 includes a first side surface and a plurality of second side surfaces, the first side surface and the second portion 1312 are parallel to and in contact with each other on a side away from the light-emitting layer; two adjacent side surfaces of the plurality of second side surfaces intersect and are arranged opposite to each other, and the orthographic projections of the plurality of second side surfaces on the substrate are a plurality of straight lines. At this time, the cross-sectional shape of the first portion 1311 along the plane perpendicular to the substrate 11 is a triangle. The second portion 1312 of the first polarizing unit 131 includes a fourth side, a fifth side, a sixth side and a seventh side, the fourth side and the fifth side are parallel to each other and opposite to each other, the sixth side and the seventh side are parallel to each other and opposite to each other, and the sixth side and the fourth side are perpendicular to each other; wherein the fourth side or the sixth side is parallel to and in contact with the first portion, and at this time, the cross-sectional shape of the second portion 1312 along a plane perpendicular to the substrate 11 is a rectangle.

[0107] The first grating of the blue light-emitting device is a single-layer metal grating. The first portion 1311 and the second portion 1312 of the first polarizing unit 131 are made of silver. The refractive index of the first filling layer 132 is 1.46. The grating period width P of the first grating is 0.265 μm. The width a of the first polarizing unit 131 along the first direction (i.e., the line width of the first grating) is 0.095 μm. The height H of the first portion 1311 is 0. s is 0.180 μm, and the height H of the second portion 1312 is t The first polarizing unit 131 of the blue light-emitting device configured as described above has a first portion 1311 in which the reflectivity of the second type of polarized light in the ambient light is significantly reduced in the blue light wavelength range. Therefore, the first polarizing layer 13 of the blue light-emitting device provided in the embodiment of the present disclosure exhibits asymmetric optical polarization characteristics in which the side away from the light-emitting layer can transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; and the side of the first polarizing layer close to the light-emitting layer can reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

[0108] In the blue light-emitting device provided by the embodiment of the present disclosure, the second grating is a single-layer metal grating, the material of the second polarizing unit 1411 is silver, the refractive index of the second filling layer 1412 is 1.46, the material of the second filling layer 1412 is BCB glue, the thickness of the second filling layer 1412 is 0.21nm, and the material of the reflective sublayer 142 is silver. The grating period width P of the second grating is 0.14μm; the width a of the second polarizing unit 1411 along the second direction (i.e., the line width of the second grating) is 0.04μm; and the width of the second polarizing unit 1411 perpendicular to the second direction is 0.035μm. The second polarizing layer 14 of the blue light-emitting device configured as described above has a polarization conversion efficiency of 0.77 between the first type of polarized light and the second type of polarized light in the blue light wavelength range. Therefore, the second polarizing layer 14 of the blue light-emitting device provided by the embodiment of the present disclosure exhibits optical polarization characteristics that can modulate the phase of light and achieve mutual conversion between the second type of polarized light and the first type of polarized light.

[0109] An embodiment of the present disclosure provides a light-emitting device, which includes: a substrate, and a light-emitting layer arranged on one side of the substrate; a first polarizing layer, which is arranged on the side of the light-emitting layer close to the substrate, and the first polarizing layer is formed on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, each of the first polarizing units includes a first portion on a side away from the light-emitting layer and a second portion on a side close to the light-emitting layer, and the first portion and the second portion have different cross-sectional shapes along a plane perpendicular to the substrate; a second polarizing layer is formed, the second polarizing layer includes a polarizing sublayer, which is arranged on the side of the light-emitting layer away from the substrate, or the polarizing sublayer is arranged on the side of the light-emitting layer close to the substrate, and the polarizing sublayer includes a plurality of second polarizing units, and the arrangement direction of the plurality of second polarizing units is different from that of the plurality of first polarizing units. The present disclosure provides a first polarizing layer with asymmetric optical polarization characteristics, and polarizes the ambient light incident from the ambient light side and the self-luminescence emitted by the light-emitting layer in different forms, so that the second type of polarized light in the ambient light is absorbed, while the first type of polarized light in the ambient light and the self-luminescence enter the interior of the light-emitting device, thereby reducing the reflectivity of the ambient light and reducing the proportion of ambient light in the output light of the light-emitting device; at the same time, the light entering the interior of the light-emitting device is modulated by the light of the second polarizing layer and the first polarizing layer and is emitted from the light-emitting side, effectively enhancing the light efficiency of the light-emitting device.

[0110] Based on the same inventive concept, the embodiments of the present disclosure disclose a display panel, comprising: a substrate 1; and a plurality of light-emitting devices as described in the embodiments of the present disclosure, wherein the plurality of light-emitting devices are arranged on one side of the substrate 1; wherein the plurality of light-emitting devices include a plurality of light-emitting devices that emit light of different colors. Specifically, the plurality of light-emitting devices include any one or more of red light-emitting devices, blue light-emitting devices, green light-emitting devices, and white light-emitting devices, wherein the red light-emitting device emits red light, the blue light-emitting device emits blue light, the green light-emitting device emits green light, and the white light-emitting device emits white light. Exemplarily, the display panel may include red light-emitting devices, blue light-emitting devices, and green light-emitting devices, and the display panel may also include red light-emitting devices, blue light-emitting devices, green light-emitting devices, and white light-emitting devices.

[0111] In an optional embodiment, the grating parameters of the first polarizing layer and / or the second polarizing layer in the plurality of light-emitting devices emitting light of different colors are different, wherein the grating parameters include at least one of the following: the number of polarizing units, the grating period width of the grating, the width of each polarizing unit along the direction in which the polarizing units are arranged, and the width of each polarizing unit along the direction perpendicular to the direction in which the polarizing units are arranged. Existing solutions for reducing the reflectivity of ambient light using circular polarizers are generally narrow-band polarizers set for a single wavelength, which results in low broadband working efficiency. The embodiments of the present disclosure can realize the patterning of different polarizing layers corresponding to light-emitting devices of multiple colors based on semiconductor processing, so that light-emitting devices of different colors have adaptive grating parameters, ensuring that each light-emitting device of different colors has the lowest ambient light reflectivity and maximum light efficiency for each different color of light. FIG14 shows an example diagram of gratings for different color light-emitting chips in an RGB display panel proposed in one embodiment of the present disclosure. As shown in FIG14 , the number of first polarization units of the R-type first grating of the red light-emitting device, the G-type first grating of the green light-emitting device, and the B-type first grating of the blue light-emitting device decreases in sequence, and the grating period width of the first grating increases in sequence; the number of second polarization units of the R-type second grating of the red light-emitting device, the G-type second grating of the green light-emitting device, and the B-type second grating of the blue light-emitting device decreases in sequence, and the grating period width of the second grating increases in sequence. By setting different grating parameters for the first grating and the second grating of the red light-emitting device, the green light-emitting device, and the blue light-emitting device in the display panel are ensured to have the lowest ambient light reflectance and the maximum light efficiency.

[0112] FIG15 shows a flowchart for optimizing the design of grating parameters for light-emitting chips of different colors in an RGB display panel proposed in an embodiment of the present disclosure. As shown in FIG15 , the central operating wavelength of each color of light is first extracted based on the LED emission spectrum. Taking the RGB three-color light-emitting device as an example, the central operating wavelength of red light, the central operating wavelength of green light, and the central operating wavelength of blue light are determined respectively. Subsequently, based on the central operating wavelength of red light, the central operating wavelength of green light, and the central operating wavelength of blue light, the grating parameters of the first grating and the second grating of the red light-emitting device, the green light-emitting device, and the blue light-emitting device are optimized. The order of optimizing the grating parameters of the first grating and the second grating of the red light-emitting device, the green light-emitting device, and the blue light-emitting device can be adjusted according to actual conditions. FIG15 is only an optional example. The optimized RGB three-color light-emitting device is then tested to test whether the ambient reflectivity and light efficiency of the light-emitting device of each color meet preset application indicators. If the application indicators are met, the RGB pixelated grating layout is performed.

[0113] In an optional embodiment, in order to further reduce the ambient reflectivity of each color of the light-emitting device, in the display panel provided by the embodiment of the present disclosure, a different second filter layer is set in each light-emitting device of different color. Figure 16 shows a schematic diagram of the second filter layer corresponding to the RGB light-emitting device of a display panel provided by an embodiment of the present disclosure. As shown in Figure 16, a red second filter layer (RCF) is set in the red light-emitting device, a green second filter layer (GCF) is set in the green light-emitting device, and a blue second filter layer (BCF) is set in the blue light-emitting device. By setting different second filter layers for light-emitting devices of different colors, the monochromatic transmittance is improved, and the second filter layer can use a semiconductor preparation process, so the size and thickness of the second filter layer can be further reduced.

[0114] In an optional embodiment, the second filter layer is a dielectric color film filter, which is an inorganic dielectric filter, including two stacked reflective structures and a patterned layer arranged between the two reflective structures. Taking a display panel of RGB light-emitting devices as an example, in the RGB light-emitting devices, the materials of the reflective structures corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are the same; the materials of the patterned layers corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are not exactly the same.

[0115] Furthermore, FIG17 shows a schematic diagram of the second filter layer structure corresponding to the RGB light-emitting devices of a display panel provided by an embodiment of the present disclosure. As shown in FIG17 , the first reflective structure in the second filter layer is located above each pixel area, the second reflective structure in the second filter layer is located below each pixel area, and the patterned layer in the second filter layer is located in the middle of each pixel area. As can be seen from FIG17 , the materials of the first reflective structure and the second reflective structure corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are all the same. The materials of the patterned layers corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are different from each other. Preferably, the material of the patterned layer corresponding to the red light-emitting device is MgF2; the material of the patterned layer corresponding to the green light-emitting device is MgF2 and NbO2; and the material of the patterned layer corresponding to the blue light-emitting device is NbO2.

[0116] Based on the same inventive concept, the embodiment of the present disclosure provides a method for preparing a light-emitting device, which is used to prepare the light-emitting device described in the embodiment of the present disclosure. The preparation method includes: providing a substrate; forming a light-emitting layer on one side of the substrate; forming a first polarizing layer on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, each of the first polarizing units includes a first portion on a side away from the light-emitting layer and a second portion on a side close to the light-emitting layer, and the first portion and the second portion have different cross-sectional shapes along a plane perpendicular to the substrate; forming a second polarizing layer, the second polarizing layer includes a polarizing sublayer, the polarizing sublayer is arranged on the side of the light-emitting layer away from the substrate, or the polarizing sublayer is arranged on the side of the light-emitting layer close to the substrate, the polarizing sublayer includes a plurality of second polarizing units, and the arrangement direction of the plurality of second polarizing units is different from that of the plurality of first polarizing units.

[0117] In an optional embodiment, the polarizing layer 141 in the light emitting device is disposed on a side of the light emitting layer 12 that is away from the substrate 11. Specifically, the preparation method includes the following steps:

[0118] S11. Anneal the electrode layer. Figure 18a shows a hierarchical structure diagram of annealing the electrode layer in a method for preparing a light-emitting device proposed in an embodiment of the present disclosure. As shown in Figure 18a, when implementing step S11, first provide a substrate 11; form a light-emitting layer 12 on one side of the substrate 11, and the light-emitting layer 12 includes a buffer layer 121, a first semiconductor layer 122, an active layer 123, and a second semiconductor layer 124 stacked on one side of the substrate; form an electrode layer 15 on the side of the light-emitting layer 12 away from the substrate, and the material of the electrode layer 15 is ITO. After the electrode layer 15 is formed, the electrode layer 15 is annealed to reduce the roughness of the surface of the electrode layer 15 on the side away from the substrate.

[0119] S12. Forming a second grating. FIG18b shows a schematic diagram of the hierarchical structure of forming a second grating in a method for preparing a light-emitting device proposed in an embodiment of the present disclosure. As shown in FIG18b , when step S12 is specifically implemented, a second grating material layer is formed on the side of the electrode layer 15 away from the light-emitting layer 12, and the second grating is formed on the first grating material layer by etching or filling. The second grating includes a plurality of second polarizing units 1411 spaced apart along a second direction. The plurality of second polarizing units 1411 are arranged close to the light-emitting layer 12, and there is a gap between two adjacent second polarizing units 1411. Exemplarily, a silver metal layer is deposited on the side of the electrode layer 15 away from the light-emitting layer 12, the pattern of the second grating is nano-imprinted, and the plurality of second grating units 1411 of the second grating are etched.

[0120] S13. Forming a second filling layer. Figure 18c shows a schematic diagram of the hierarchical structure of forming a second filling layer in a method for preparing a light-emitting device according to an embodiment of the present disclosure. As shown in Figure 18c, when step S13 is implemented, a second filling layer material is formed on the side of the second grating facing away from the light-emitting layer 12, forming a second filling layer 1412. The second filling layer material fills the gaps between the second polarizing units 1411. Exemplarily, BCB photoresist is overcoated on the side of the prepared second grating facing away from the light-emitting layer 12 to form the second filling layer 1412.

[0121] S14. Forming a reflective sublayer. Figure 18d illustrates a schematic diagram of the hierarchical structure of a reflective sublayer formed in a method for fabricating a light-emitting device according to an embodiment of the present disclosure. As shown in Figure 18d , during step S14, a reflective sublayer 142 is formed on the side of the second filling layer 1412 facing away from the light-emitting layer 12. For example, a silver metal material layer is deposited on the side of the second filling layer 1412 facing away from the light-emitting layer 12 to form the second filling layer 1412.

[0122] S15. Form a first polarizing layer on the bonding substrate. Figure 18e shows a schematic diagram of the hierarchical structure of forming a first polarizing layer on a bonding substrate in a method for preparing a light-emitting device proposed in an embodiment of the present disclosure. As shown in Figure 18e, when implementing step S15, first provide a bonding substrate 16; form a first grating material layer on one side of the bonding substrate 16, and form the first grating on the first grating material layer by etching or filling, the first grating including a plurality of first polarizing units 131 spaced apart along a first direction, the plurality of first polarizing units 131 being arranged close to the bonding substrate 16, and there being a gap between two adjacent first polarizing units 131; then, form a first filling layer material on the side of the first grating away from the bonding substrate 16 to form a first filling layer 132, wherein the material of the first filling layer fills the gap between the first polarizing units 131. Illustratively, a silver metal layer is deposited on one side of the bonding substrate 16, the pattern of the first grating is nano-embossed, and a plurality of first grating units 131 of the first grating are etched; and the material of the first filling layer is suspended on the side of the prepared second grating facing away from the bonding substrate 16 to form the first filling layer 132.

[0123] S16, bonding the bonding substrate to the light-emitting layer. Figure 18f shows a schematic diagram of the hierarchical structure of bonding the bonding substrate to the light-emitting layer in a method for preparing a light-emitting device according to an embodiment of the present disclosure. As shown in Figure 18f, when step S16 is implemented, a bonding adhesive is applied on the side of the light-emitting layer 12 facing away from the second polarizing layer 14 to form a bonding adhesive layer 17; the bonding substrate 16 having the first polarizing layer 13 formed thereon is bonded to the light-emitting device having the second polarizing layer 14 formed thereon through the bonding adhesive layer 17 to obtain the light-emitting device according to the embodiment of the present disclosure.

[0124] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0125] References herein to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Furthermore, please note that instances of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0126] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0127] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present disclosure.

Claims

1. A light-emitting device, characterized in that, The light-emitting device includes: a substrate, and a light-emitting layer disposed on one side of the substrate; a first polarizing layer, the first polarizing layer being disposed on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, and each first polarizing unit includes a first portion on the side away from the light-emitting layer and a second portion on the side close to the light-emitting layer, and the cross-sectional shapes of the first portion and the second portion in a plane perpendicular to the substrate are different; a second polarizing layer, the second polarizing layer including a photon-polarizing sublayer, the photon-polarizing sublayer being disposed on the side of the light-emitting layer away from the substrate, or the photon-polarizing sublayer being disposed on the side of the light-emitting layer close to the substrate, the photon-polarizing sublayer including a plurality of second polarizing units, and the arrangement directions of the plurality of second polarizing units are different from those of the plurality of first polarizing units.

2. The light-emitting device according to claim 1, wherein The first polarizing layer includes: a first grating, the first grating including the plurality of first polarizing units arranged at intervals in a first direction, the plurality of first polarizing units being disposed close to the light-emitting layer, and there being a gap between two adjacent first polarizing units; a first filling layer, the first filling layer being disposed on the side of the first grating away from the light-emitting layer, and the first filling layer filling the gaps between the plurality of first polarizing units.

3. The light-emitting device according to claim 1, wherein The first portion is configured to be able to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the second portion is configured to be able to reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

4. The light-emitting device according to claim 1, wherein The first portion includes a first side face, a second side face, and a third side face that intersect pairwise, and the first side face is parallel and in contact with the side of the second portion away from the light-emitting layer; the second side face and the third side face are oppositely disposed, and the orthographic projections of the second side face and the third side face on the substrate are three mutually parallel straight lines.

5. The light-emitting device according to claim 1, wherein The first portion includes a first side face and a second arc face, the first side face is parallel and in contact with the side of the second portion away from the light-emitting layer; the second arc face intersects with the two opposite ends of the first side face, and the second arc face protrudes in a direction away from the second portion.

6. The light-emitting device according to claim 1, wherein The first portion includes a first side face and a plurality of second side faces, the first side face is parallel and in contact with the side of the second portion away from the light-emitting layer; two adjacent side faces among the plurality of second side faces intersect and are oppositely disposed, and the orthographic projections of the plurality of second side faces on the substrate are a plurality of straight lines.

7. The light-emitting device according to claim 1, wherein The second portion includes a fourth side face, a fifth side face, a sixth side face, and a seventh side face, the fourth side face and the fifth side face are parallel and oppositely disposed, the sixth side face and the seventh side face are parallel and oppositely disposed, and the sixth side face is perpendicular to the fourth side face; wherein, the fourth side face or the sixth side face is parallel and in contact with the first portion.

8. The light-emitting device according to claim 2, wherein The grating period width of the first grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the first polarization unit along the first direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the first polarization unit along the direction perpendicular to the first direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

9. The light-emitting device according to claim 1, characterized in that, The material of the first part is a metal material, a dielectric material or a visible light absorbing material; the material of the second part is a metal material or a dielectric material.

10. The light-emitting device according to claim 1, characterized in that, The second polarization layer further includes a reflective sub-layer, and the reflective sub-layer is disposed on a side of the light-emitting layer away from the substrate; the second polarization layer is configured to modulate the phase of light to achieve mutual conversion between the second type of polarized light and the first type of polarized light.

11. The light-emitting device according to claim 10, wherein The polarization sub-layer includes: A second grating, the second grating includes a plurality of the second polarization units arranged at intervals along a second direction, the plurality of second polarization units are disposed close to the light-emitting layer, and there is a gap between two adjacent second polarization units, the second direction intersects with the first direction, and the first direction is the direction in which the plurality of first polarization units are arranged; A second filling layer, the second filling layer is disposed on a side of the second grating away from the light-emitting layer, and the second filling layer fills the gap between the plurality of second polarization units.

12. The light-emitting device according to claim 11, wherein, The second polarization unit is configured to reflect at least one of a first component of the first type of polarized light, a first component of the second type of polarized light, and a first component of the first type of polarized light and a first component of the second type of polarized light, and transmit at least one of a second component of the first type of polarized light, a second component of the second type of polarized light, and a second component of the first type of polarized light and a second component of the second type of polarized light; The reflective sub-layer is configured to reflect the first component and the second component of the first type of polarized light and / or the second type of polarized light.

13. The light-emitting device according to claim 11, characterized in that, The grating period width of the second grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the second polarization unit along the second direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the second polarization unit along the direction perpendicular to the second direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

14. The light-emitting device according to claim 1, characterized in that, The light-emitting device further includes a filter layer, and the filter layer is disposed between the first polarization layer and the light-emitting layer, wherein the filter layer is a first filter layer or a second filter layer, the first filter layer is a single-layer color film filter or a plasma resonance filter; the second filter layer includes two stacked reflective structures and a patterned layer disposed between the two reflective structures.

15. The light-emitting device according to claim 1, characterized in that, Each of the first polarization units includes a plurality of first polarization sub-units arranged at intervals along the length direction of the first polarization unit, the first polarization sub-units are columnar structures, and the orthographic projection of the first polarization sub-units on the substrate is a polygon or an arc.

16. A display panel, characterized in that, The display panel includes: A substrate; and, A plurality of light-emitting devices as claimed in any one of claims 1 to 15, the plurality of light-emitting devices being disposed on one side of the substrate; wherein, the plurality of light-emitting devices include light-emitting devices that emit light of different colors.

17. The display panel according to claim 16, characterized in that, Among the plurality of light-emitting devices that emit light of different colors, the grating parameters of the first polarizing layer and / or the second polarizing layer are different, and the grating parameters at least include one of the following: the number of polarizing units, the grating period width of the grating, the width of each polarizing unit along the arrangement direction of the polarizing units, and the width of each polarizing unit along the direction perpendicular to the arrangement direction of the polarizing units.

18. A method for preparing a light-emitting device, characterized in that, The method includes: Providing a substrate; Forming a light-emitting layer on one side of the substrate; Forming a first polarizing layer on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, and each first polarizing unit includes a first part on the side away from the light-emitting layer and a second part on the side close to the light-emitting layer, and the cross-sectional shapes of the first part and the second part along the plane perpendicular to the substrate are different; Forming a second polarizing layer, the second polarizing layer including a photon polarization layer, the photon polarization layer being disposed on the side of the light-emitting layer away from the substrate, or, the photon polarization layer being disposed on the side of the light-emitting layer close to the substrate, the photon polarization layer including a plurality of second polarizing units, and the arrangement directions of the plurality of second polarizing units are different from those of the plurality of first polarizing units.

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