Ultraviolet LED device with glass box dam
By using adjustable slope glass dam and reflective material layer in ultraviolet LED devices, combined with glass cover plate, the problem of low radiation efficiency of ultraviolet LED devices in the prior art is solved, and higher irradiance and better Low cost while avoiding the warping problem caused by metal dams.
Patent Information
- Application Number
- CN202420782492.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-15
AI Technical Summary
Due to the low photoelectric conversion efficiency of existing ultraviolet LED devices, the radiation power is small, and the reflectivity of metal dams to ultraviolet light is low, resulting in low radiation efficiency, which limits the development of UVC LEDs.
A glass dam is adopted, the through-hole shape is an inverted pyramid or an inverted cone, the slope is adjustable, and the inner wall is equipped with a layer of reflective material, combined with a glass cover to improve radiation efficiency.
By improving the reflection and gathering effect of light, the irradiance per unit area is improved, the process cost is reduced, and the problem of warping after the metal dam is bonded to the substrate is avoided, and the process yield is improved.
Smart Images
Figure CN222261112U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ultraviolet LED lighting, in particular to an ultraviolet LED device with a glass dam. Background Art
[0002] Currently, preventive disinfection of living and working environments and objects is an important protective measure. For large-scale environmental disinfection, chlorine-containing disinfectants are usually sprayed, which contain hypochlorous acid, an effective broad-spectrum bactericidal disinfectant, which can effectively kill bacteria, viruses, fungi and spores. However, chlorine-containing disinfectants have their limitations, because hypochlorous acid is corrosive, and its disinfection by-products contain carcinogenic chlorine-containing organic matter such as trihalomethanes. Chlorine-containing disinfectants are not suitable for preventive disinfection of clothing, personal belongings, food (fruits, vegetables, sashimi), tableware, toys and other items. The ultraviolet solution is a good choice for preventive disinfection of the above items, because it does not produce residues or disinfection by-products, which solves the problem of secondary pollution left over from disinfection by disinfectants, and at the same time eliminates the need for re-cleaning after disinfection.
[0003] Ultraviolet light with a wavelength less than 280nm can destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in microorganisms, making them unable to reproduce and achieving the effect of sterilization and disinfection. The traditional ultraviolet light source is a mercury arc lamp (commonly known as an ultraviolet lamp or mercury lamp). Mercury lamps contain mercury, which is a harmful heavy metal and will be gradually eliminated.
[0004] It is an inevitable trend for ultraviolet light emitting diodes (UVC LEDs) to replace low-pressure mercury lamps as the next generation of ultraviolet light sources. First of all, UVC LEDs have environmental advantages because UVC LED devices do not contain mercury. Secondly, UVC LEDs have adjustable wavelengths and short half-wave widths. Compared with low-pressure mercury lamps with fixed wavelengths, they can achieve an efficient disinfection wavelength of 265nm, while mercury lamps can only be 254nm. Compared with the explosive disadvantage of mercury lamps, UVC LEDs are third-generation semiconductor technology, with no concerns about explosions and no safety risks of mercury vapor leakage. Another disadvantage of mercury lamps is that the radiation efficiency fluctuates greatly with the ambient temperature, while UVC LEDs are much more stable. In addition, mercury lamps cannot work at low temperatures, while UVC LEDs can work stably at low temperatures. In view of the above advantages, UVC LEDs have developed rapidly in recent years.
[0005] However, UVC LED has low radiation power due to the low photoelectric conversion efficiency of the chip, which is also the bottleneck that currently restricts the rapid development of UVC LED. From the packaging perspective, both full inorganic packaging and semi-inorganic packaging are not conducive to improving the radiation power. One of the reasons is that the inner wall of the metal dam of the aluminum nitride ceramic substrate is made of metal material gold, and the reflectivity of gold to ultraviolet rays is very low, especially deep ultraviolet rays, resulting in severe absorption of ultraviolet rays and low radiation power. Another reason is that the inner wall of the metal dam of the aluminum nitride ceramic substrate is vertical, with no inclination angle, and given that the quartz glass cover has a total reflection angle, it is difficult for light to be emitted after being reflected by the inner wall.
[0006] At present, there are dams with slopes. For example, the invention patent "A focused ultraviolet LED packaging structure and its preparation method" with patent number: ZL201710417857.7 and the utility model patent "A new type of ultraviolet LED packaging structure" with patent number: 202220987519.3 use silicon dams. The silicon dam is made by wet etching and cutting of silicon wafers, and the inner wall of the through hole is coated with metal material aluminum. The process of silicon dam is a standard semiconductor wet etching process, so the cost of silicon dam is high and the slope is not adjustable.
[0007] In the market, Qingdao Jason's UVC LED products use an aluminum dam with an angle. The dam material is aluminum metal, which is made by machining. Aluminum has a high reflectivity to ultraviolet rays, but aluminum dams are not a semiconductor batch process, so the process cost is high. In addition, due to the large difference in thermal expansion coefficients, the aluminum dam will cause the aluminum nitride ceramic substrate to warp severely after bonding with it, affecting the yield of subsequent processes. Utility Model Content
[0008] The purpose of the utility model is to overcome the deficiencies and defects of the prior art and provide an ultraviolet LED device based on a glass dam.
[0009] To achieve this purpose, the utility model adopts the following technical solutions:
[0010] A UV LED device with a glass dam comprises a substrate, a glass dam bonded to the front side of the substrate, a UV LED chip and a Zener diode disposed in the glass dam and fixed to the front side of the substrate, wherein the Zener diode is electrically connected to the UV LED chip to prevent the UV LED chip from being broken down by static electricity; the UV LED chip has at least one, the bottom surface of the glass dam is bonded to the front side of the substrate, a through hole is provided in the middle area, the top opening size of the through hole is larger than the bottom opening size, the through hole is in the shape of an inverted pyramid or an inverted cone, and the inclination is adjustable; the top and bottom opening shapes of the through hole are any one of polygons with a side length ≥ 4, or a circle.
[0011] The glass dam is easy to shape and produce, and the material has good light transmittance and an adjustable expansion coefficient, which can better match the UV LED substrate and chip.
[0012] In one embodiment, the through hole of the glass dam has a slope of 60°, and the top and bottom openings of the through hole are square. The through hole slope refers to the angle between the side of the through hole and the bottom of the glass dam.
[0013] In one of the embodiments, the inner wall and upper surface of the through hole of the glass dam are provided with a reflective material layer, which can be used to reflect ultraviolet light.
[0014] In one of the embodiments, the reflective material layer is made of one of aluminum, silver, barium sulfate, magnesium chloride, magnesium fluoride and calcium carbonate.
[0015] There can be more than one UV LED chip.
[0016] In one embodiment, there is a UV LED chip, and the UV LED chip is a UV LED chip with an emission wavelength between 320nm and 420nm. For example, the emission wavelength of the UV LED chip can be any wavelength band such as 365nm, 395nm, and 405nm.
[0017] In one embodiment, there are two UV LED chips, in addition to the above-mentioned UV LED chip with an emission wavelength between 320nm-420nm, there is also a UV LED chip with an emission wavelength between 100nm-280nm. The UV LED chip can be any wavelength of 255nm, 265nm, 275nm and 280nm.
[0018] In one embodiment, there may be more than two UV LED chips. The emission wavelengths of the multiple UV LED chips may be consistent or inconsistent, and may be combined as needed.
[0019] The substrate is a substrate commonly used for ultraviolet LEDs, and can be a plastic substrate, a ceramic substrate, a silicon substrate or a glass substrate. Preferably, the substrate is a ceramic substrate, especially an aluminum nitride ceramic substrate.
[0020] In some of the embodiments, the ultraviolet LED device of the embodiments of the present invention further includes a glass cover plate, wherein the glass cover plate covers the glass dam to seal the ultraviolet LED chip and the Zener diode.
[0021] In one of the embodiments, the ultraviolet transmittance of the glass cover plate in the 100-420 nm band is ≥80%.
[0022] In one embodiment, the glass cover is any one of quartz glass and soda-lime glass.
[0023] In some embodiments, the glass cover may not be provided to form an open UV LED device structure.
[0024] Compared with the prior art, the utility model has the following beneficial effects:
[0025] The utility model arranges a glass dam in the ultraviolet LED device. Since the through hole of the dam is in the shape of an inverted pyramid or an inverted cone and the slope is adjustable, it has a better effect of reflecting and gathering ultraviolet light, thereby achieving the effect of improving the irradiance per unit area. At the same time, the process and material costs of the glass dam are lower than those of the silicon dam and the aluminum dam. After the glass dam is bonded to the aluminum nitride ceramic substrate, the aluminum nitride ceramic substrate will not be warped, thereby improving the yield of subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 is a schematic structural diagram of the ultraviolet LED device of Example 1;
[0027] Figure 2 is a schematic cross-sectional view of the ultraviolet LED device of Example 1;
[0028] Figure 3 is a schematic structural diagram of the ultraviolet LED device of Example 2;
[0029] Figure 4 is a cross-sectional schematic diagram of the ultraviolet LED device of Example 2;
[0030] Figure 5 This is a glass dam array diagram of an embodiment of the utility model;
[0031] Among them, 1. UV LED chip, 2. Zener diode, 3. substrate, 4. glass dam, 5. glass cover. DETAILED DESCRIPTION
[0032] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the utility model, so as to fully understand the purpose, scheme and effect of the utility model. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other without conflict.
[0033] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, top, bottom, etc. used in the present invention are only relative to the relative positional relationship of the various components of the present invention in the accompanying drawings.
[0034] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. The terms used in this specification are only for describing specific embodiments, not for limiting the present invention. The term "and / or" used herein includes any combination of one or more related listed items.
[0035] It should be understood that, although the terms first, second, third, etc. may be used to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element.
[0036] The embodiment of the utility model provides an ultraviolet LED device with a glass dam, comprising a substrate, a glass dam bonded to the front of the substrate, an ultraviolet LED chip and a Zener diode disposed in the glass dam and fixed to the front of the substrate, the Zener diode being electrically connected to the ultraviolet LED chip to prevent the ultraviolet LED chip from being broken down by static electricity. The ultraviolet LED chip has at least one, the bottom surface of the glass dam is bonded to the front of the substrate, a through hole is provided in the middle area, the top opening size of the through hole is larger than the bottom opening size, the through hole is in the shape of an inverted pyramid or an inverted cone, and the inclination is adjustable; the top and bottom opening shapes of the through hole can be any one of polygons with a side length of ≥4, or a circle.
[0037] Preferably, the through hole of the glass dam has a slope of 60°, and the top and bottom openings of the through hole are square. The through hole slope refers to the angle between the side of the through hole and the bottom of the glass dam.
[0038] The inner wall and upper surface of the through hole of the glass dam are provided with a reflective material layer, which can be used to reflect ultraviolet light. The reflective material layer is made of one of aluminum, silver, barium sulfate, magnesium chloride, magnesium fluoride and calcium carbonate. Preferably, it is an aluminum reflective material layer.
[0039] There can be more than one UV LED chip.
[0040] In some embodiments, there is a UV LED chip, and the UV LED chip is a UV LED chip with an emission wavelength between 320nm and 420nm. For example, the emission wavelength of the UV LED chip can be any band such as 365nm, 395nm, and 405nm.
[0041] In some embodiments, there are two ultraviolet LED chips, in addition to the ultraviolet LED chip with an emission wavelength between 320nm-420nm, there is also an ultraviolet LED chip with an emission wavelength between 100nm-280nm. The ultraviolet LED chip can be any wavelength of 255nm, 265nm, 275nm and 280nm.
[0042] In some embodiments, there may be more than two UV LED chips. The emission wavelengths of the multiple UV LED chips may be consistent or inconsistent, and may be combined as needed.
[0043] The substrate is a substrate commonly used for ultraviolet LEDs, and can be a plastic substrate, a ceramic substrate, a silicon substrate or a glass substrate. Preferably, the substrate is a ceramic substrate, especially an aluminum nitride ceramic substrate. The substrate and the glass dam can be bonded by glue or welding.
[0044] In some embodiments, the UV LED device of the present invention further comprises a glass cover plate, which covers the glass dam to seal the UV LED chip and the Zener diode. The glass cover plate can be sealed with the glass dam by gluing or welding.
[0045] The glass cover plate is any one of quartz glass and soda-lime glass.
[0046] Moreover, the ultraviolet transmittance of the glass cover plate in the 100-420nm band is ≥80%, such as 80%, 83%, 85%, 90%, 95%, 98%, etc.
[0047] In some embodiments, the glass cover may not be provided to form an open UV LED device structure.
[0048] The following is further described in conjunction with specific embodiments.
[0049] Example 1
[0050] Reference Figure 1-2 The present embodiment provides a UV LED device with a glass dam, comprising a substrate 3, a glass dam 4 bonded to the front of the substrate, a UV LED chip 1 and a Zener diode 2 disposed in the glass dam 4 and fixed to the front of the substrate 3, the Zener diode 2 being electrically connected to the UV LED chip 1, the UV LED chip 1 having at least one, the bottom surface of the glass dam 4 being bonded to the front of the substrate 3, a through hole being provided in the middle region, the top opening size of the through hole being larger than the bottom opening size, the through hole being in the shape of an inverted pyramid, the through hole of the glass dam having a slope of 60°, that is, the angle between the side of the through hole and the bottom surface of the glass dam is 60°. The top and bottom opening shapes of the through hole are square.
[0051] An aluminum reflective material layer is provided on the inner wall and upper surface of the through hole of the glass dam 4 .
[0052] The glass dam 4 has two ultraviolet LED chips 1 , one of which has an emission wavelength of 365 nm, and another of which has an emission wavelength of 280 nm. The two ultraviolet LED chips 1 are both electrically connected to the Zener diode 2 .
[0053] The substrate 3 is an aluminum nitride ceramic substrate.
[0054] Table 1 shows the irradiance comparison results of a product of a specific embodiment and a product using a traditional metal dam under the same conditions. It can be seen from the comparison that the irradiance is improved.
[0055] Table 1 Comparison of irradiance between UV LED devices with glass dam and UV LED devices with traditional metal dam
[0056]
[0057] Example 2
[0058] Reference Figure 3 and Figure 4 The present embodiment provides an ultraviolet LED device with a glass dam, comprising a substrate 3, a glass dam 4 bonded to the front surface of the substrate, an ultraviolet LED chip 1 and a Zener diode 2 disposed in the glass dam and fixed to the front surface of the substrate, the Zener diode 2 being electrically connected to the ultraviolet LED chip 1, the ultraviolet LED chip 1 having at least one, the bottom surface of the glass dam 4 being bonded to the front surface of the substrate 3, a through hole being provided in the middle area, the top opening size of the through hole being larger than the bottom opening size, the through hole being in an inverted cone shape, the through hole inclination of the glass dam being 60°, and the top and bottom opening shapes of the through hole being square.
[0059] The inner wall and upper surface of the through hole of the glass dam 4 are sputtered with an aluminum reflective material layer, which can be used to reflect ultraviolet light.
[0060] The glass dam 4 has two ultraviolet LED chips 1 , one of which has an emission wavelength of 365 nm, and another of which has an emission wavelength of 280 nm. The two ultraviolet LED chips 1 are both electrically connected to the Zener diode 2 .
[0061] The substrate 3 is an aluminum nitride ceramic substrate.
[0062] The device further comprises a glass cover plate 5, which covers the glass dam 4 to seal the ultraviolet LED chip 1 and the Zener diode 2. The glass cover plate 5 can be sealed with the glass dam 4 by gluing or welding.
[0063] The glass cover plate 5 is made of quartz glass, and the ultraviolet transmittance in the 100-420nm band is 90%.
[0064] Table 2 shows the irradiance comparison results of a product of a specific embodiment and a product using a traditional metal dam under the same conditions. By comparison, it can be seen that the irradiance is improved, and the irradiance improvement is greatly improved after adding a glass cover, which can be increased by 30%. This may be because after the glass cover is sealed, the light can be reflected multiple times in the cavity, the utilization rate is improved, and thus the irradiance is greatly improved.
[0065] Table 2 Comparison of irradiance between UV LED devices with glass dam and UV LED devices with traditional metal dam
[0066]
[0067] Figure 5 It is an array diagram of the glass dam of the embodiment of the utility model. It can be seen that the manufacturing process of the glass dam is simple and easy to be mass-produced.
[0068] In summary, it can be seen that the utility model arranges a glass dam in the ultraviolet LED device. The glass dam is easy to shape and manufacture, has an adjustable slope, has a better effect of reflecting and gathering ultraviolet light, and achieves the effect of improving the irradiance per unit area.
[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.
[0070] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A UV LED device with a glass dam, characterized in that: It comprises a substrate (3), a glass dam (4) bonded to the front of the substrate (3), and an ultraviolet LED chip (1) and a Zener diode (2) disposed in the glass dam and fixed to the front of the substrate; The Zener diode (2) is electrically connected to the ultraviolet LED chip (1) and is used to prevent the ultraviolet LED chip (1) from being broken down by static electricity; The ultraviolet LED chip (1) has at least one; The bottom surface of the glass dam (4) is fitted with the front surface of the substrate (3), and a through hole is provided in the middle area; the top opening size of the through hole is larger than the bottom opening size; the through hole is in the shape of an inverted pyramid or an inverted cone, and the inclination is adjustable; the top and bottom opening shapes of the through hole are any one of polygons with a side length of ≥4, or a circle.
2. The ultraviolet LED device with a glass dam according to claim 1, characterized in that: The through hole of the glass dam (4) has an inclination of 60°, and the top and bottom openings of the through hole are square in shape.
3. The ultraviolet LED device with a glass dam according to claim 1, characterized in that: The inner wall and upper surface of the through hole of the glass dam (4) are provided with a reflective material layer.
4. The ultraviolet LED device with a glass dam according to claim 3, characterized in that: The reflective material layer is made of one of aluminum, silver, barium sulfate, magnesium chloride, magnesium fluoride and calcium carbonate.
5. The ultraviolet LED device with glass dam according to claim 1, characterized in that: The ultraviolet LED chip (1) comprises an ultraviolet LED chip with an emission wavelength between 320nm and 420nm.
6. The ultraviolet LED device with a glass dam according to claim 5, characterized in that: The ultraviolet LED chip (1) also includes an ultraviolet LED chip with an emission wavelength between 100 nm and 280 nm.
7. The ultraviolet LED device with a glass dam according to claim 1, characterized in that: The substrate (3) is a plastic substrate, a ceramic substrate, a silicon substrate or a glass substrate.
8. The ultraviolet LED device with a glass dam according to any one of claims 1 to 7, characterized in that: It also comprises a glass cover plate (5), wherein the glass cover plate covers the glass dam.
9. The ultraviolet LED device with a glass dam according to claim 8, characterized in that: The ultraviolet transmittance of the glass cover plate (5) in the 100-420nm wavelength range is ≥80%.
10. The ultraviolet LED device with a glass dam according to claim 8, characterized in that: The glass cover plate (5) is any one of quartz glass and soda-lime glass.