Light-emitting element
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2026-08-11
AI Technical Summary
高接触电阻会导致在相同的电流下，电极和焊盘之间的电压降增加，这意味着在相同的输入功率下，芯片的有效电压降低，从而影响芯片的发光效率
[0032]本申请发光元件的台面结构包括主体部以及布置在主体部两侧延伸部，相邻延伸部和主体部之间形成多个凹凸区域，显著提高了侧面出光面积，有助于提高光效；
Smart Images
Figure CN224627099U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of semiconductor device technology, and specifically relates to a light-emitting element. Background Technology
[0002] The structure of a flip-chip LED consists of a substrate, an N-type semiconductor layer, a light-emitting layer, a P-type semiconductor layer, and electrodes, from top to bottom. In this structure, both the p-electrode and the n-electrode are located on the bottom surface, away from the light-emitting surface, which avoids blocking the emitted light and improves the light emission efficiency of the chip.
[0003] In current ultraviolet flip-chip LEDs, maximizing the active area of the light-emitting element sacrifices the contact area between the electrodes and pads, resulting in increased contact resistance. High contact resistance leads to an increased voltage drop between the electrodes and pads at the same current, meaning a lower effective voltage for the chip at the same input power, thus affecting the chip's luminous efficiency. Furthermore, when current flows through the electrodes and pads, high resistance causes more electrical energy to be converted into Joule heat instead of being used for light emission. This not only reduces the chip's energy efficiency but also increases its temperature, further impacting its luminous efficiency and lifespan. Utility Model Content
[0004] The purpose of this application is to provide a light-emitting element to solve the technical problem in the prior art that, in order to maximize the area of the active region of the light-emitting element, the contact area between the electrodes and the pads is sacrificed, which affects the light-emitting efficiency of the chip and reduces the energy efficiency and lifespan of the chip.
[0005] To achieve the above objectives, the first aspect of this application provides a light-emitting element, comprising:
[0006] Substrate;
[0007] A first conductivity type semiconductor layer is disposed on the surface of the substrate, and a first region and a second region other than the first region are formed on the surface of the first conductivity type semiconductor layer.
[0008] A mesa structure covering the first region, the mesa structure including a main body and a plurality of extensions arranged on one or both sides of the main body, the main body extending along a first direction, the mesa structure including an active layer and a second conductive type semiconductor layer stacked sequentially along a direction away from the first conductive type semiconductor layer.
[0009] The first electrode is disposed in the second region;
[0010] The second electrode is disposed on the semiconductor layer of the second conductivity type;
[0011] An insulating layer covers the first electrode and the second electrode, and the insulating layer has a first opening that overlaps with the orthographic projection of the first electrode and a second opening that overlaps with the orthographic projection of the second electrode.
[0012] A first pad is disposed on the surface of the insulating layer, and the first pad contacts the first electrode through the first opening;
[0013] The second pad is disposed on the surface of the insulating layer. The second pad contacts the second electrode through the second opening. The second pad is spaced apart from the first pad.
[0014] In one or more embodiments, the plurality of extensions are spaced apart in a first direction, and the first opening is wholly or partially arranged at one or both ends of the tabletop structure in the first direction.
[0015] In the first direction, the spacing between adjacent extensions is consistent.
[0016] In one or more embodiments, in the first direction, the spacing between adjacent extensions located near one end of the first opening is greater than the spacing between at least some of the adjacent extensions.
[0017] In one or more embodiments, the first opening is arranged at one or both ends of the tabletop structure in a first direction, and the first opening extends along the second direction, which is perpendicular to the first direction.
[0018] In one or more embodiments, the first opening includes a first main body segment extending along the second direction, and a first branch segment extending from the end of the first main body segment along the first direction, wherein the second direction is perpendicular to the first direction;
[0019] The first main body segment is arranged at one or both ends of the first direction of the table structure, and the first branch segment extends along the first direction to the outside of at least one of the extensions.
[0020] In one or more embodiments, the first opening includes a plurality of opening segments arranged at intervals along the second direction, and at least one of the opening segments extends along the first direction to the outside of at least one of the extensions;
[0021] The second direction is perpendicular to the first direction.
[0022] In one or more embodiments, the length of the extension located near the first opening is less than the length of the other extensions, so as to form a clearance on one or both sides of the first direction of the tabletop structure, to which the first opening extends.
[0023] In one or more embodiments, the extensions of the plurality of extensions have the same extension length in the second direction.
[0024] In one or more embodiments, the extension extends along a second direction or in a direction inclined relative to the second direction, wherein the second direction is perpendicular to the first direction.
[0025] In one or more embodiments, a plurality of the extensions located on the same side of the main body are arranged in parallel.
[0026] In one or more embodiments, the sidewalls of the platform structure are irregular surfaces with a plurality of concave and convex microstructures.
[0027] In one or more embodiments, the concave-convex microstructure is an arc-shaped groove, a triangular groove, an arc-shaped protrusion, or a triangular protrusion.
[0028] In one or more embodiments, the second opening includes a second main body segment that overlaps with the orthographic projection of the main body portion and a second branch segment that overlaps with the orthographic projection of at least one of the extension portions.
[0029] In one or more embodiments, the insulating layer is a DBR insulating layer composed of alternating layers of high refractive index and low refractive index.
[0030] In one or more embodiments, the light-emitting element is an ultraviolet light-emitting element.
[0031] The advantages of this application, which differ from existing technologies, are:
[0032] The mesa structure of the light-emitting element in this application includes a main body and extensions arranged on both sides of the main body. Multiple concave and convex areas are formed between adjacent extensions and the main body, which significantly increases the side light-emitting area and helps to improve the light efficiency.
[0033] The first opening of the light-emitting element in this application is arranged at one or both ends of the first direction of the mesa structure. Through the structural design of the first opening and the spacing design of the extension, the contact area between the first electrode and the first pad can be increased while ensuring sufficient light-emitting area, thereby reducing the contact resistance, improving the energy efficiency and heat dissipation efficiency of the chip, and improving the light-emitting efficiency and lifespan of the chip. Attached Figure Description
[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the light-emitting element of this application;
[0036] Figure 2 This is a top view schematic diagram of one embodiment of the light-emitting element of this application;
[0037] Figure 3 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0038] Figure 4 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0039] Figure 5 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0040] Figure 6 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0041] Figure 7 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0042] Figure 8 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0043] Figure 9 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0044] Figure 10 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0045] Figure 11 This is a top view schematic diagram of another embodiment of the light-emitting element of this application;
[0046] Figure 12 This is a top view schematic diagram of another embodiment of the light-emitting element of this application.
[0047] Explanation of key figure labels:
[0048] Substrate 100;
[0049] First conductivity type semiconductor layer 200; First region 201; Second region 202;
[0050] Tabletop structure 300; Main body 301; Extension 302; Concave-convex microstructure 303;
[0051] Active layer 400;
[0052] Second conductivity type semiconductor layer 500;
[0053] First electrode 600;
[0054] Second electrode 700;
[0055] Insulating layer 800; First opening 801; Opening segment 8011; First main body segment 8012; First branch segment 8013; Second opening 802; Second main body segment 8021; Second branch segment 8022;
[0056] First pad 900;
[0057] Second pad 1000;
[0058] Avoidance point 1100. Detailed Implementation
[0059] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.
[0060] In current UV flip-chip LEDs, maximizing the active area of the light-emitting element sacrifices the contact area between the electrodes and pads, resulting in increased contact resistance. High contact resistance leads to an increased voltage drop between the electrodes and pads at the same current, meaning a lower effective voltage for the chip at the same input power, thus affecting the chip's luminous efficiency. Furthermore, when current flows through the electrodes and pads, high resistance causes more electrical energy to be converted into Joule heat instead of being used for light emission. This not only reduces the chip's energy efficiency but also increases its temperature, further impacting its luminous efficiency and lifespan.
[0061] To address the aforementioned issues, the applicant has developed a novel light-emitting element that increases the contact area between the electrodes and pads while maintaining sufficient light-emitting area. Increasing the contact area effectively reduces contact resistance. Lower contact resistance means a smaller voltage drop between the electrodes and pads at the same current, which not only improves the chip's electrical performance but also reduces power loss and increases energy efficiency. Furthermore, increasing the contact area improves the chip's heat dissipation efficiency. In flip-chip LEDs, heat is primarily conducted to the external heat dissipation structure through the pads and electrodes. A larger contact area provides more heat conduction paths, thus more effectively dissipating the heat generated by the chip. Therefore, by optimizing the contact area between the N-electrode and the N-pad, the chip's operating temperature can be significantly reduced, improving its reliability and lifespan.
[0062] Specifically, please refer to Figure 1 , Figure 1 This is a cross-sectional structural schematic diagram of one embodiment of the light-emitting element of this application, as shown below. Figure 1 As shown, the light-emitting element includes a substrate 100 and a first conductivity type semiconductor layer 200 disposed on the substrate 100.
[0063] The substrate 100 may be a sapphire substrate, a silicon carbide substrate, a gallium nitride substrate, a gallium arsenide substrate, a silicon substrate, or other semiconductor material substrates known in the art.
[0064] The surface of the first conductivity type semiconductor layer 200 has a first region 201 and a second region 202 other than the first region 201, wherein the first region 201 is provided with a mesa structure 300 and the second region 202 is provided with a first electrode 600.
[0065] Specifically, the mesa structure 300 includes an active layer 400 and a second conductive type semiconductor layer 500 stacked sequentially along a direction away from the first conductive type semiconductor layer 200.
[0066] A second electrode 700 is also disposed on the surface of the second conductivity type semiconductor layer 500.
[0067] In this embodiment, the first conductivity type semiconductor layer 200 can be configured as at least one of a group III-V or group II-VI compound semiconductor doped with a dopant of the first conductivity type. For example, the first conductivity type semiconductor layer 200 can be one of the group consisting of GaN, AlGaN, GaAl, InP, InAs, and GaP.
[0068] In one embodiment, the light-emitting element can be a deep ultraviolet light-emitting element, and the material of the first conductivity type semiconductor layer 200 can be AlGaN. The first conductivity type semiconductor layer 200 can be an n-type semiconductor layer doped with a first conductivity type dopant, such as an n-type dopant like Si, Ge, Sn, Se, Te, etc.
[0069] In this embodiment, the second conductivity type semiconductor layer 500 can be configured as at least one of a group III-V or group II-VI compound semiconductor doped with a dopant of the second conductivity type. For example, the second conductivity type semiconductor layer 500 can be one of the group consisting of GaN, AlGaN, GaAl, InP, InAs, and GaP.
[0070] In one embodiment, the light-emitting element can be a deep ultraviolet light-emitting element, and the material of the second conductivity type semiconductor layer 500 can be AlGaN. The second conductivity type semiconductor layer 500 can be a p-type semiconductor layer with a second conductivity type dopant, such as a p-type dopant made of Mg, Zn, Ca, Sr, or Ba.
[0071] In this embodiment, the first conductivity type semiconductor layer 200 is an n-type semiconductor layer, and the second conductivity type semiconductor layer 500 is a p-type semiconductor layer, thereby forming a Pn structure. It can be understood that in other embodiments, the first conductivity type semiconductor layer 200 may also be a p-type semiconductor layer doped with a p-type dopant, and correspondingly, the second conductivity type semiconductor layer 500 may also be an n-type semiconductor layer doped with an n-type dopant, both of which can achieve the effect of this embodiment.
[0072] In this embodiment, the materials of the first electrode 600 and the second electrode 700 may include, but are not limited to, one or more of Ag, Cr, Ti, Al, Ni, Au, Rh, and ITO. More specifically, in one embodiment, in order to improve luminous efficiency, the first electrode 600 and the second electrode 700 may be a multilayer structure composed of a contact layer, a reflective layer, and a blocking layer. The materials of the contact layer may include, but are not limited to, one or more of ITO, Rh, and Au; the materials of the reflective layer may include, but are not limited to, one or more of Al and Ag; and the materials of the blocking layer may include, but are not limited to, one or more of Ti, Au, Ni, Pt, and W.
[0073] Furthermore, such as Figure 1 As shown, the first electrode 600 and the second electrode 700 are also covered with an insulating layer 800. The insulating layer 800 has a first opening 801 that overlaps with the orthographic projection of the first electrode 600 and a second opening 802 that overlaps with the orthographic projection of the second electrode 700.
[0074] A first pad 900 and a second pad 1000 are arranged on the insulating layer 800. The first pad 900 contacts the first electrode 600 through the first opening 801, and the second pad 1000 contacts the second electrode 700 through the second opening 802.
[0075] In one embodiment, the insulating layer 800 may be made of silicon oxide or silicon nitride. In another embodiment, to improve luminous efficiency, the insulating layer 800 may be a DBR insulating layer 800 composed of alternating layers of high refractive index and low refractive index.
[0076] The structure of the first electrode 600 and the second electrode 700 in this application is described in detail below. Please refer to [link / reference needed]. Figure 2 , Figure 2 This is a top view schematic diagram of one embodiment of the light-emitting element of this application. To facilitate observation of the internal structure, [the diagram is shown in the original text]. Figure 2 The insulating layer 800, the first pad 900, and the second pad 1000 are made transparent in the subsequent attached figures.
[0077] like Figure 2 As shown, in this embodiment, the tabletop structure 300 includes a main body 301 and extensions 302 symmetrically arranged on both sides of the main body 301. The main body 301 extends along a first direction x, and a plurality of extensions 302 are spaced apart along the first direction x. Each extension 302 extends along a second direction y.
[0078] Furthermore, in this embodiment, the first opening 801 is arranged entirely at one end of the first direction x of the platform structure 300, and the first opening 801 extends along the second direction y from one end near the substrate 100 to the other end near the substrate 100.
[0079] Based on the design of the mesa structure 300, multiple concave and convex areas are formed, which can significantly increase the side light-emitting area and effectively improve the light-emitting efficiency. At the same time, the first opening 801 is arranged at one end of the first direction x of the mesa structure 300 and extends along the second direction y, which helps to maximize the contact area between the first electrode 600 and the first pad 900, improve the chip's energy efficiency and heat dissipation efficiency, and reduce local overheating.
[0080] Furthermore, in this embodiment, in order to maximize the contact area between the second electrode 700 and the second pad 1000, the second opening 802 can be arranged at the end of the second electrode 700 away from the first opening 801, and the second opening 802 includes a second main body segment 8021 that overlaps with the orthographic projection of the main body 301 and a second branch segment 8022 that overlaps with the orthographic projection of the plurality of extensions 302.
[0081] Understandably, based on the size of the second pad 1000, the length of the second main body segment 8021 and the number of the second branch segments 8022 can be adjusted to maximize the contact area between the second electrode 700 and the second pad 1000.
[0082] In the above embodiments, the extension portion 302 extends along the second direction y. In other embodiments, the extension portion 302 may also extend along other directions. For example, please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a top view schematic diagram of another embodiment of the light-emitting element of this application, as shown below. Figure 3 As shown, the extension 302 can also be extended in a direction inclined to the second direction y, which can also achieve the effect of this embodiment.
[0083] It should be noted that in this embodiment, the multiple extensions 302 located on the same side of the main body 301 are arranged parallel to each other. In other embodiments, the multiple extensions 302 located on the same side of the main body 301 may not be arranged parallel to each other. For example, the multiple extensions 302 may be arranged symmetrically with respect to the center line of the main body 301, etc., all of which can achieve the effect of this embodiment.
[0084] In addition, in the above embodiments, the extension portions 302 located on both sides of the main body 301 are symmetrically arranged. In other embodiments, the extension portions 302 located on both sides of the main body 301 may also be asymmetrically arranged. For example, the extension portions 302 located on both sides of the main body 301 may also be staggered, which can also achieve the effect of this embodiment.
[0085] In the above embodiments, all the first openings 801 are arranged at one end of the tabletop structure 300 in the first direction x. In other embodiments, the first openings 801 may also be arranged at both ends of the tabletop structure 300. The first openings 801 arranged at both ends of the tabletop structure 300 may be symmetrically arranged or asymmetrically arranged. For example, please refer to [link to relevant documentation]. Figure 4 , Figure 4 This is a top view schematic diagram of another embodiment of the light-emitting element of this application, as shown below. Figure 4 As shown, the first opening 801 can be symmetrically arranged at both ends of the first direction x of the mesa structure 300. Correspondingly, the second opening 802 can be arranged at a position that overlaps with the orthographic projection of the middle region of the mesa structure 300, thereby further increasing the contact area between the first electrode 600 and the first pad 900. However, under the limited area of the substrate 100, this embodiment will result in a reduction of the light-emitting area. It can be designed based on actual needs.
[0086] In the above embodiments, the spacing between adjacent extensions 302 is consistent. In other embodiments, the spacing between adjacent extensions 302 may be inconsistent. For example, please refer to [link to relevant documentation]. Figure 5 , Figure 5 This is a top view schematic diagram of another embodiment of the light-emitting element of this application, as shown below. Figure 5 As shown, in this embodiment, the spacing d1 of the adjacent extensions 302 near the first opening 801 is greater than the spacing d2 of the adjacent extensions 302 covered by the second pad 1000.
[0087] Sufficient spacing must be maintained between the two pads to prevent short circuits during manufacturing or use. This embodiment is based on a design where the spacing between adjacent extensions 302 is inconsistent. Figure 2 Compared to the embodiment shown, this embodiment can increase the area of the second opening 802 by reducing the distance d2 between the extensions 302, while ensuring that the side light-emitting area remains unchanged and the safe distance between the two pads remains safe. This increases the contact area between the second electrode 700 and the second pad 1000, reduces the contact resistance and reduces power loss. At the same time, it can also provide more space for the first opening 801, which helps to increase the contact area between the first electrode 600 and the first pad 900. A larger contact area can provide more heat conduction paths, thereby more effectively conducting heat from the LED chip to the heat dissipation structure.
[0088] For further details, please refer to Figure 6 , Figure 6 This is a top view schematic diagram of another embodiment of the light-emitting element of this application, as shown below. Figure 6 As shown, in this embodiment, the spacing d1 between adjacent extensions 302 near the first opening 801 is greater than the spacing d3 between other adjacent extensions 302. Relative to... Figure 5 In the embodiment shown, while ensuring that the side light-emitting area remains unchanged, the area occupied by the platform structure 300 is reduced, thereby increasing the area of the first opening 801, which helps to improve the contact area between the first electrode 600 and the first pad 900.
[0089] For more details, please refer to Figure 7 , Figure 7 This is a top view schematic diagram of another embodiment of the light-emitting element of this application, as shown below. Figure 7 As shown, in this embodiment, the spacing between adjacent extensions 302 gradually decreases along the direction away from the first opening 801, i.e., the spacing d4>d5>d6>d7 in the figure. This scheme helps to provide more arrangement space for the first opening 801 while ensuring that the side light-emitting area of the light-emitting element remains unchanged. This helps to increase the contact area between the first electrode 600 and the first pad 900. On the other hand, it helps to increase the area of the second opening 802, thereby increasing the contact area between the second electrode 700 and the second pad 1000, thus reducing contact resistance and reducing power loss.
[0090] In all the above embodiments, the first opening 801 extends along the second direction y. In other embodiments, the first opening 801 may also extend in other ways. For example, please refer to [link to relevant documentation]. Figure 8 , Figure 8 This is a top view schematic diagram of another embodiment of the light-emitting element of this application.
[0091] like Figure 8 As shown, in this embodiment, the first opening 801 includes three opening segments 8011 arranged sequentially at intervals along the second direction y, and the opening segment 8011 located at the end of the second direction y extends to the outer side of the first direction x of the extension portion 302 located at the end, thereby making full use of the surface space of the substrate 100 and increasing the contact area between the first electrode 600 and the first pad 900.
[0092] It should be noted that in this embodiment, the first opening 801 includes three opening segments 8011, and the opening segment 8011 at the end extends to the outer side of the first direction x of an extension segment. In other embodiments, the first opening 801 may also include other numbers of opening segments 8011, such as 2, 4, etc. The opening segment 8011 at the end may also extend to the outer side of the first direction x of 2 or 3 extension segments, or the opening segment 8011 at the end may be completely located outside the first direction x of the table structure 300. All of these can achieve the effect of this embodiment to a certain extent.
[0093] In the above embodiments, the first opening 801 is a strip-shaped opening extending along the first direction x or the second direction y. In other embodiments, the first opening 801 may not be a strip-shaped opening extending in a single direction. For example, please refer to [link to relevant documentation]. Figure 9 , Figure 9 This is a top view schematic diagram of another embodiment of the light-emitting element of this application.
[0094] like Figure 9 As shown, in this embodiment, the first opening 801 includes a first main body segment 8012 extending along the second direction y, and a first branch segment 8013 extending from the end of the first main body segment 8012 along the first direction x. The first main body segment 8012 is disposed at one end of the platform structure 300 in the first direction x, and the first branch segment 8013 extends to the outside of the extension portion 302 located near one end of the first opening 801 in the first direction x. This embodiment, by optimizing the structure of the first opening 801, can further increase the contact area between the first electrode 600 and the first pad 900.
[0095] It should be noted that in this embodiment, the first opening 801 is only arranged at one end of the table structure 300. In other embodiments, the first opening 801 can also be arranged at both ends of the table structure 300, and the first opening 801 at each end can include the first main body segment 8012 and the first branch segment 8013. Alternatively, the first opening 801 at only one end can include the first main body segment 8012 and the first branch segment 8013. Both can achieve the effect of this embodiment.
[0096] In the above embodiments, the extension lengths of the plurality of extensions 302 in the second direction y are consistent; in other embodiments, the extension lengths of the plurality of extensions 302 in the second direction y may also be inconsistent. For example, the length of the extension 302 near the first opening 801 may be less than the length of the other extensions 302, thereby forming a clearance 1100 on one or both sides of the platform structure 300 near the first opening 801, so that the first opening 801 can extend to the clearance 1100, further increasing the contact area between the first electrode 600 and the first pad 900, which will be described in detail below.
[0097] Please see Figure 10 , Figure 10 This is a top view schematic diagram of another embodiment of the light-emitting element of this application, as shown below. Figure 10 As shown, in this embodiment, the length h1 of the extension 302 near the first opening 801 is smaller than the length h2 of the other extensions 302, thus forming clearance areas 1100 on both sides of the table structure 300 near the first opening 801. The first opening 801 includes a first main body segment 8012 extending along the second direction y, and a first branch segment 8013 extending from the end of the first main body segment 8012 along the first direction x. The first branch segment 8013 extends to the clearance area 1100, thus relative to... Figure 9 The implementation method further increases the contact area between the first electrode 600 and the first pad 900.
[0098] Please see Figure 11 , Figure 11 This is a top view schematic diagram of another embodiment of the light-emitting element of this application, as shown below. Figure 11 As shown, in this embodiment, the length h3 of the extension 302 near the first opening 801 is smaller than the length h4 of the other extensions 302, thus forming clearance areas 1100 on both sides of the table structure 300 near the first opening 801. The first opening 801 includes three opening segments 8011 arranged at intervals along the second direction y. Each opening segment 8011 extends along the first direction x, and the opening segment 8011 at the end extends to the clearance area 1100, thus relative to... Figure 8 The implementation method further increases the contact area between the first electrode 600 and the first pad 900.
[0099] It should be noted that, in Figure 10 and Figure 11 In the illustrated embodiment, the lengths of the two extensions 302 located near the first opening 801 are less than the lengths of the other extensions 302, thereby forming clearance areas 1100 on both sides of the first x-end of the table structure 300. In other embodiments, only one extension 302 located near the first opening 801 may be less than the lengths of the other extensions 302, thereby forming a clearance area 1100 on one side of the first x-end of the table structure 300. Alternatively, multiple extensions 302 located near the first opening 801 may be less than the lengths of the other extensions 302, thereby further increasing the area of the first opening 801. However, this will correspondingly reduce the side light-emitting area, which can be adjusted based on actual needs.
[0100] In the above embodiments, the sidewalls of the platform structure 300 are all planar. In other embodiments, the sidewalls of the main body 301 and / or the sidewalls of the extension 302 may be irregular surfaces with a plurality of concave and convex microstructures 303, thereby further increasing the side light-emitting area. For example, please refer to [reference needed]. Figure 12 , Figure 12 This is a top view schematic diagram of another embodiment of the light-emitting element of this application.
[0101] like Figure 12 As shown, in this embodiment, the sidewalls of the main body 301 and the extension 302 are both irregular surfaces with a plurality of concave and convex microstructures 303, wherein the concave and convex microstructures 303 are arc-shaped grooves with different radii and curvatures. Relative to Figure 2 The embodiment shown can further increase the side light-emitting area.
[0102] It should be noted that this embodiment only shows an example where the concave-convex microstructure 303 is an arc-shaped groove. In other embodiments, the concave-convex microstructure 303 can also be a triangular groove, an arc-shaped protrusion, a triangular protrusion, an irregularly shaped groove, an irregularly shaped protrusion, etc., all of which can achieve the effect of this embodiment. In addition, in this embodiment, the sidewalls of the main body 301 and the sidewalls of the extension 302 are both irregular surfaces with several arc-shaped grooves. In other embodiments, only the sidewalls of the extension 302 can be irregular surfaces with several arc-shaped grooves, or only the sidewalls of the main body 301 can be irregular surfaces with several arc-shaped grooves, which can also achieve the effect of increasing the light-emitting area on the side.
[0103] The light-emitting element based on the above embodiments can significantly increase the side light-emitting area, while increasing the contact area between the first electrode 600 and the first pad 900, making the current density distribution more uniform, reducing local overheating, avoiding the sharp drop in efficiency caused by "edge light emission", shortening the lateral current extension distance, and improving the light efficiency.
[0104] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0105] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A light-emitting element, characterized in that, include: Substrate; A first conductivity type semiconductor layer is disposed on the surface of the substrate, and a first region and a second region other than the first region are formed on the surface of the first conductivity type semiconductor layer. A mesa structure covering the first region, the mesa structure including a main body and a plurality of extensions arranged on one or both sides of the main body, the main body extending along a first direction, the mesa structure including an active layer and a second conductive type semiconductor layer stacked sequentially along a direction away from the first conductive type semiconductor layer. The first electrode is disposed in the second region; The second electrode is disposed on the semiconductor layer of the second conductivity type; An insulating layer covers the first electrode and the second electrode, and the insulating layer has a first opening that overlaps with the orthographic projection of the first electrode and a second opening that overlaps with the orthographic projection of the second electrode. A first pad is disposed on the surface of the insulating layer, and the first pad contacts the first electrode through the first opening; The second pad is disposed on the surface of the insulating layer. The second pad contacts the second electrode through the second opening. The second pad is spaced apart from the first pad.
2. The light-emitting element according to claim 1, characterized in that, The plurality of extensions are spaced apart in a first direction, and the first opening is arranged wholly or partially at one or both ends of the table structure in the first direction. Wherein, in the first direction, the spacing between adjacent extensions is consistent; or, In the first direction, the spacing between adjacent extensions located near the first opening is greater than the spacing between at least some of the adjacent extensions; or, In the direction away from the first opening, the spacing between adjacent extensions gradually decreases.
3. The light-emitting element according to claim 1, characterized in that, The first opening is arranged at one or both ends of the tabletop structure in the first direction, and the first opening extends along the second direction, which is perpendicular to the first direction.
4. The light-emitting element according to claim 1, characterized in that, The first opening includes a first main body segment extending along a second direction, and a first branch segment extending from the end of the first main body segment along the first direction, wherein the second direction is perpendicular to the first direction; The first main body segment is arranged at one or both ends of the first direction of the platform structure, and the first branch segment extends along the first direction to the outside of at least one of the extensions.
5. The light-emitting element according to claim 1, characterized in that, The first opening includes a plurality of opening segments arranged at intervals along a second direction, and at least one of the opening segments extends along the first direction to the outside of at least one of the extensions; The second direction is perpendicular to the first direction.
6. The light-emitting element according to claim 4 or 5, characterized in that, The length of the extension located near the first opening is less than the length of the other extensions, so as to form a clearance on one or both sides of the tabletop structure in the first direction, to which the first opening extends; or, The extensions of the plurality of said extensions have the same extension length in the second direction.
7. The light-emitting element according to claim 1, characterized in that, The extension portion extends along a second direction or extends in a direction inclined relative to the second direction, wherein the second direction is perpendicular to the first direction; and / or The plurality of extensions located on the same side of the main body are arranged in parallel; and / or, The extensions located on both sides of the main body are symmetrically arranged.
8. The light-emitting element according to claim 1, characterized in that, The sidewalls of the platform structure have a surface with several concave and convex microstructures.
9. The light-emitting element according to claim 8, characterized in that, The concave-convex microstructure is an arc-shaped groove, a triangular groove, an arc-shaped protrusion, or a triangular protrusion.
10. The light-emitting element according to claim 1, characterized in that, The second opening includes a second main body segment that overlaps with the orthographic projection of the main body portion and a second branch segment that overlaps with the orthographic projection of at least one of the extension portions.
11. The light-emitting element according to claim 1, characterized in that, The insulating layer is a DBR insulating layer composed of alternating layers of high refractive index layers and low refractive index layers; and / or, The light-emitting element is an ultraviolet light-emitting element.