Light emitting device and light emitting apparatus

Abstract

The present invention relates to a light-emitting device and a light-emitting apparatus, wherein a through groove is provided on a substrate, the groove extends circumferentially and separates the substrate into a first connection area and a second connection area, a light extraction component is provided on the upper surface of the substrate, and the upper surface of the substrate is separated into a plurality of assembly areas, each assembly area includes a portion of the first connection area, a portion of the groove and a portion of the second connection area, and a plurality of light-emitting elements are flip-chip mounted on the plurality of assembly areas, and the first connection area and the second connection area are respectively connected to two electrodes of the light-emitting element. Through the above arrangement, the internal light-emitting element has a high degree of integration, and the light-emitting device is formed to be small in size, which is suitable for the need to install high-density light-emitting elements in a limited space. At the same time, the light-emitting angle of the light-emitting device is expanded to meet the requirements of high light efficiency output and wide-angle light emission.

Description

Technical Field

[0001] The present invention relates to the field of ultraviolet light-emitting semiconductor technology, and in particular to a light-emitting device and a light-emitting apparatus. Background Art

[0002] Bacteria killing is becoming more and more important in our daily life. UVC-LED is widely used in the field of sterilization. UVC sterilization has gradually become a standard feature of various household appliances (such as air conditioners, air purifiers, dishwashers, dryers, washing machines, etc.). Drinking water is also gradually sterilized again with UVC. There is limited space reserved for UVC packaging devices in these specific applications. For example, air conditioners or purification devices are often located in air inlets and outlets or air ducts, and water pipes are located in water pipes.

[0003] Conventional UVC packaging devices are to electroplate a dam support on a ceramic substrate and then eutecticize the UVC chip. Multiple UVC chips can be placed in the dam, and finally the UVC chip is sealed with quartz glass on the top of the dam. This conventional UVC packaging device has a limited light-emitting angle. If the light-emitting angle is to be expanded, multiple packaging devices need to be integrated into one with a supporting structure. The integration is low, and the structure is large in size, which is not suitable for installation in limited spaces. In addition, the additional support structure and wiring design also increase costs and increase the difficulty of mass production.

[0004] In view of this, there is an urgent need to provide a light emitting device and a light emitting apparatus to solve the current defects. Summary of the invention

[0005] Based on this, the present invention provides a light-emitting device and a light-emitting apparatus, wherein the internal light-emitting elements have a high degree of integration, forming a light-emitting device with a small size, which is suitable for installation and use in a limited space. At the same time, the light-emitting angle of the light-emitting device is expanded so that the light-emitting device can achieve high light efficiency output and wide-angle light emission.

[0006] The present invention provides a light-emitting device, which includes a substrate, wherein the upper surface and the lower surface of the substrate are both provided with a conductive layer and a groove, the groove on the upper surface coincides with the groove on the lower surface along a projection perpendicular to the substrate, the groove extends circumferentially along a closed structure, and separates the conductive layer into a first connection area and a second connection area; a light extraction component is provided on the upper surface of the substrate, and separates the upper surface of the substrate into a plurality of assembly areas, wherein the assembly areas include a portion of the first connection area, a portion of the groove, and a portion of the second connection area; and a plurality of light-emitting elements are installed in the plurality of the assembly areas, and are respectively connected to the first connection area and the second connection area of ​​the corresponding assembly areas.

[0007] Preferably, the light extraction component comprises a plurality of baffle walls extending from the center of the substrate to the edge of the substrate, adjacent baffle walls form an angle to enclose an assembly area, and the baffle walls are divided into two sections by the groove.

[0008] Preferably, the cross-section of the retaining wall along a direction perpendicular to the extending direction of the retaining wall is trapezoidal.

[0009] Preferably, the side of the baffle wall facing the light emitting element is coated with a light reflecting coating.

[0010] Preferably, the groove is filled with an insulating reflective element.

[0011] Preferably, a through opening is provided at the center of the substrate.

[0012] Preferably, the opening is filled with a heat dissipation insulation element.

[0013] Preferably, the light emitting element is also wrapped with a hemispherical sealing body.

[0014] The present invention further provides a light emitting device, comprising a plurality of stacked light emitting devices as described above, wherein the upper surface of the light emitting device is stacked and abutted against the lower surface of an adjacent light emitting device,

[0015] Alternatively, the upper surface of the light emitting device is stacked and abutted against the upper surface of an adjacent light emitting device.

[0016] Preferably, a positioning portion is provided around the opening of the light emitting device, and a plurality of the light emitting devices are stacked and arranged via the positioning portion.

[0017] The beneficial effect of the present invention is to provide a light-emitting device and a light-emitting apparatus, wherein a through groove is provided on a substrate, the groove extends circumferentially and separates the substrate into a first connection area and a second connection area, a light extraction component is provided on the upper surface of the substrate, and the upper surface of the substrate is separated into a plurality of assembly areas, each assembly area includes a portion of the first connection area, a portion of the groove and a portion of the second connection area, and a plurality of light-emitting elements are flip-chip mounted on the plurality of assembly areas, and the first connection area and the second connection area are respectively connected to the two electrodes of the light-emitting element. Through the above arrangement, the internal light-emitting element has a high degree of integration, and the light-emitting device is formed to be small in size, which is suitable for the need to install high-density light-emitting elements in a limited space. At the same time, the light-emitting angle of the light-emitting device is expanded to meet the requirements of high light efficiency output and wide-angle light emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the upper surface structure of a light emitting device is provided for an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional view of the light emitting device along the AA direction;

[0020] Figure 3 for Figure 1 Schematic diagram of the lower surface structure of the light emitting device;

[0021] Figure 4 for Figure 1 A schematic diagram of the structure of the upper surface of the light emitting device before assembling the light emitting element;

[0022] Figure 5 for Figure 1 A schematic diagram of the side structure of a light emitting device;

[0023] Figure 6 for Figure 1 A schematic diagram of the side structure of the light-emitting element after being wrapped with a sealing body;

[0024] Figure 7 A schematic diagram of a forward stacking structure of a light emitting device according to an embodiment of the present invention;

[0025] Figure 8 A schematic diagram of a reverse stacking structure of a light emitting device according to an embodiment of the present invention;

[0026] The meanings of the symbols in the accompanying drawings are:

[0027] 100-light-emitting device; 1-substrate; 11-conductive layer; 12-insulating carrier; 13-assembly area; 14-opening; a-upper surface; b-lower surface; c-center; d-edge; 2-groove; 3-first connection area; 4-second connection area; 5-light extraction component; 51-blocking wall; 511-side; 6-light-emitting element; 7-sealing body; 8-positioning part; x-extension direction; 200-light-emitting device. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] See also Figure 1-Figure 6, is a schematic diagram of the structure of a light emitting device 100 provided in an embodiment of the present invention, wherein the light emitting device 100 comprises a substrate 1, a light extraction component 5 and a plurality of light emitting elements 6. The light extraction component 5 is disposed on the substrate 1 and surrounds the light emitting element 6 to improve the light extraction efficiency of the light emitting element 6.

[0032] The substrate 1 includes three layers, an insulating carrier 12 in the middle and a conductive layer 11 disposed on the upper surface a and the lower surface b, respectively. The insulating carrier 12 includes but is not limited to insulating materials such as glass epoxy resin, resin, and ceramics, and preferably ceramics with high heat resistance and weather resistance are used. Ceramic materials include but are not limited to materials such as aluminum oxide and aluminum nitride. The conductive layer 11 includes but is not limited to metals such as copper, aluminum, gold, silver, platinum, titanium, tungsten, palladium, iron, and nickel, or alloys thereof. The outer surface of the conductive layer 11 is passivated. Looking down ( Figure 1 Direction), the substrate 1 in the figure is roughly rectangular. In actual application, the substrate 1 can also be set to a triangle, pentagon, hexagon, circle, etc. The substrate 1 is provided with a slot 2 that penetrates the conductive layer 11. Each conductive layer 22 is provided with a slot 2, and the shapes and sizes of the two slots 2 are exactly the same, that is, the slot 2 on the upper surface a coincides with the slot 2 on the lower surface b along the projection perpendicular to the substrate 1. Each slot 2 is connected end to end to form a closed figure inside the edge of the substrate 1, and extends circumferentially along the closed figure. In this embodiment, the slot 2 extends along the side length of the rectangle. In fact, the slot 2 can also extend along the periphery of a circle, triangle, hexagon, etc., or along the periphery of an irregular figure. Looking from above, the slot 2 divides the conductive layer 11 into a first connection area 3 and a second connection area 4 separated by a gap. The shape of the first connection area 3 and the second connection area 4 is determined according to the edge of the substrate 1 and the shape of the slot 2.

[0033] The light extraction component 5 is arranged on the upper surface a of the substrate 1, that is, on the upper conductive layer 11, and separates the upper surface a of the substrate 1 into a plurality of assembly areas 13, each of which includes a portion of the first connection area 3, a portion of the groove 2, and a portion of the second connection area 4. The light extraction component 5 includes a plurality of baffle walls 51, each of which is further divided into two sections by the groove 2, and the plurality of baffle walls 51 converge at one point, and adjacent baffle walls 51 are arranged at an angle, and an assembly area 13 is enclosed. Specifically, in the embodiment of the present invention, each baffle wall 51 extends from the center of the substrate 1 to the edge of the substrate 1. In the embodiment of the present invention, four assembly areas 13 are arranged, corresponding to four baffle walls 51, and each baffle wall 51 extends from the center of the substrate 1 to the rectangular corner to evenly arrange the assembly areas 13. In other applications, the number of assembly areas 13 may be increased or decreased, for example, 3, 5, 6, etc. assembly areas 13 may be arranged.

[0034] A plurality of light emitting elements 6 are mounted in a plurality of assembly areas 13, the assembly areas 13 are arranged one by one with the light emitting elements 6, and the two electrodes of the light emitting elements 6 are respectively connected to the first connection area 3 and the second connection area 4 of the assembly area 13. The more assembly areas 13 there are, the more light emitting elements 6 there are, and the more integrated the light emitting elements 6 are. The light emitting elements 6 are preferably flip-chip light emitting elements 6, and correspondingly, the light emitting elements 6 are flip-chip mounted in the assembly area 13. The light emitting elements 6 are made of conventional light emitting semiconductor materials and can emit light in the ultraviolet band.

[0035] In an optional embodiment, the side 511 of the baffle 51 facing the light emitting element 6 is coated with a light reflective coating, and the light reflective coating is formed by wrapping light reflective particles with resin. The resin can be selected from at least one material including silicone resin, modified silicone resin, epoxy resin, modified epoxy resin, and acrylic resin, and is selected from resins that are cured by heat or light irradiation. As light reflective particles, at least one material including titanium oxide, silicon oxide, zirconium oxide, potassium titanate, aluminum oxide, aluminum nitride, boron nitride, and aluminum-rich mullite can be cited. Since the two opposite side surfaces 511 of a baffle 51 each correspond to a light emitting element 6, the two side surfaces 511 are coated with a light reflective coating. Since a light emitting element 6 is surrounded by two baffles 51, the two baffles 51 are V-shaped when viewed from above, and the light emitting element 6 is arranged in the V-shaped opening 14. The side surfaces 511 of the two baffles 51 are coated with a light reflective coating, which can enhance the light output rate of the light emitting element 6 from the V-shaped opening 14. Optionally, the cross section of the blocking wall 51 along the vertical extension direction x is a trapezoid, which enhances the light extraction rate of the light emitting element 6 from the upper surface a of the substrate 1 . The cross section of the blocking wall 51 along the vertical extension direction x is preferably an isosceles trapezoid.

[0036] Preferably, the slot 2 may also be filled with an insulating reflective element, the two end faces of which are flush with the upper and lower surfaces b of the substrate 1, respectively. The insulating reflective element may be solidified with an insulating resin, and the interior may be filled with reflective particles, the material of which is similar to the light reflective coating. Optionally, the outer surface of each light emitting element 6 is also wrapped with a sealing body 7, which not only serves as an isolation seal, but also expands the light output angle. The sealing body 7 is a UV-resistant, light-transmitting colloid, preferably a fluororesin, with a certain viscosity, and may be formed by a dispensing machine. The shape may be hemispherical or a thin layer close to the light emitting element 6.

[0037] In addition, a through opening 14 is provided in the center of the substrate 1, which can be used for ventilation and heat dissipation or water cooling. In particular, after multiple light-emitting devices 100 are stacked, since most of the energy of the light-emitting element 6 is released in the form of heat energy, it is more difficult for the heat to be dissipated from the stacked structure after the multiple light-emitting elements 6 are stacked. The opening 14 is provided in the center to facilitate heat dissipation. Optionally, the opening 14 is also filled with a heat dissipation element, which can be a heat dissipation resin or can be radiated through a pipe. Optionally, a positioning portion 8 is provided around the opening 14, and the positioning portion 8 can be provided on the upper and lower surfaces of the substrate 1, which can facilitate the stacking of multiple light-emitting elements 6.

[0038] like Figure 7-8 As shown, the present invention also provides a light-emitting device 200, which includes a plurality of light-emitting devices 100 as described above, and the plurality of light-emitting devices 100 are stacked and combined. According to the structure of the light-emitting device 100 described above, there are two forms of stacking the light-emitting devices 100, one is the forward stacking of the light-emitting devices 100, the upper surface a of the light-emitting device 100 and the lower surface b of another light-emitting device 100 are stacked and abutted, that is, the top of the barrier wall 51 in one light-emitting device 100 is electrically connected to the lower surface b of the substrate 1 in another light-emitting device 100, wherein the barrier wall 51 is also divided into two parts by the groove 2, and the positions of the grooves 2 of the two light-emitting devices 100 must be aligned; the other is the reverse stacking of the light-emitting devices 100, the upper surface a of the light-emitting device 100 and the upper surface a of another light-emitting device 100 are stacked and abutted, that is, the top of the barrier wall 51 in one light-emitting device 100 is electrically connected to the top of the barrier wall 51 in another light-emitting device 100, and the grooves 2 in the barrier walls 51 of the two light-emitting devices 100 must be aligned. Regardless of any of the above forms, the light emitting device 100 can be aligned and positioned by the positioning parts 8 around the opening 14. Positioning parts 8 are provided at both ends of the opening 14, that is, the upper and lower surfaces b of the substrate 1 have positioning parts 8.

[0039] The size of a conventional UV package device, the light-emitting device 100 of the present invention can be provided with multiple light-emitting elements 6, and each light-emitting element 6 is designed with a special light extraction component 5 to make the light extraction efficiency as high as possible. At the same time, a single light-emitting device 100 of the present invention can achieve wide-angle light emission, and the side of the light-emitting device 100 can achieve 360° light emission, and the top can also emit light. The light-emitting device 200 formed by stacking multiple identical light-emitting devices 100 to achieve electrical connectivity is compact in structure and can be very small in size compared to the need for additional support structures and wiring designs, but it can load more light-emitting elements 6 inside, and can emit light at 360° in the vertical stacking direction, and the two end faces in the stacking direction can also emit light, which can meet the wide-angle and high-intensity sterilization application scenarios in limited spaces.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A light emitting device, characterized in that: The light-emitting device comprises a substrate, wherein the upper and lower surfaces of the substrate are both provided with a conductive layer and a groove, the groove of the upper surface coincides with the groove of the lower surface along a projection perpendicular to the substrate, the groove extends circumferentially along a closed structure, and separates the conductive layer into a first connection area and a second connection area; a light extraction component is provided on the upper surface of the substrate, and separates the upper surface of the substrate into a plurality of assembly areas, wherein the assembly areas include a portion of the first connection area, a portion of the groove, and a portion of the second connection area; a plurality of light-emitting elements are installed in a plurality of the assembly areas, and are respectively connected to the first connection area and the second connection area of ​​the corresponding assembly areas; The light extraction component includes a plurality of baffle walls extending from the center of the substrate to the edge of the substrate, adjacent baffle walls form an angle to enclose an assembly area, the baffle walls are divided into two sections by the grooves, the height of the baffle walls is greater than the height of the light-emitting element, and the baffle walls are conductors.

2. The light emitting device according to claim 1, characterized in that: The cross section of the retaining wall along a direction perpendicular to the extending direction of the retaining wall is trapezoidal.

3. The light emitting device according to claim 1, characterized in that: The side surface of the barrier wall facing the light emitting element is coated with a light reflecting coating.

4. The light emitting device according to claim 1, characterized in that: The groove is filled with an insulating reflective element.

5. The light emitting device according to claim 1, characterized in that: A through opening is provided at the center of the substrate.

6. The light emitting device according to claim 5, characterized in that: The opening is filled with a heat dissipation element.

7. The light emitting device according to claim 1, characterized in that: The light emitting element is also wrapped with a sealing body; The substrate comprises an insulating carrier and conductive layers respectively arranged on the upper surface and the lower surface of the insulating carrier.

8. The light emitting device according to claim 7, characterized in that: A positioning portion is arranged around the opening of the light emitting device.

9. A light emitting device, characterized in that: The light emitting device comprises a plurality of stacked light emitting devices as claimed in any one of claims 1 to 8, wherein the plurality of light emitting devices are stacked via positioning portions of the light emitting devices. The upper surface of the light emitting device is stacked and abutted against the lower surface of an adjacent light emitting device. Alternatively, the upper surface of the light emitting device is stacked and abutted against the upper surface of an adjacent light emitting device.

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