Glue-oil separated deep ultraviolet LED packaging structure

Abstract

The utility model belongs to the technical field of deep ultraviolet LEDs, and particularly relates to a glue-oil separated deep ultraviolet LED packaging structure, which comprises a ceramic substrate, a light-emitting device, filling liquid, curing glue and a spherical lens, the light-emitting device is arranged at the center of the ceramic substrate, the curing glue is arranged on the inner side surface of the spherical lens, and the filling liquid is filled in the filling liquid. The spherical lens is installed on the ceramic substrate, and filling liquid is arranged between the curing glue and the light-emitting device. According to the utility model, the glue is solidified on the spherical lens, the quartz glass is bonded on the ceramic substrate dam, the liquid is filled between the position right above the light-emitting device and the spherical lens, the filling liquid is completely attached to the position above the chip and the lens, the refractive index of the filling liquid is between the refractive index of the light-emitting device and the solidifying glue, and light refractive index gradient output is realized. Therefore, the packaging structure with high light extraction rate is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of deep ultraviolet LEDs, and in particular relates to a glue-oil separated deep ultraviolet LED packaging structure. Background Art

[0002] The wavelength of deep ultraviolet LED light sources is between 200nm and 280nm, and they are very popular because of their sterilization and disinfection functions. However, the current deep ultraviolet LED light-to-electricity conversion efficiency has not exceeded 10%, which seriously affects its application scenarios and scope. For liquid-encapsulated deep ultraviolet LED packaging devices, glue is used to bond the lens and the substrate, and the packaging device is filled with liquid, which will cause the glue and the cavity filling liquid to mix. Due to the high density of the glue, it sinks on the upper surface of the light-emitting device and blocks the light-emitting efficiency of the light-emitting device. Therefore, a packaging structure should be designed to separate the glue and the filling liquid to improve the light output rate of the light-emitting device. Utility Model Content

[0003] In view of the technical problem that the glue in the above-mentioned deep ultraviolet LED light source has a high density and sinks on the upper surface of the light-emitting device, thereby blocking the light-emitting efficiency of the light-emitting device, the utility model provides a deep ultraviolet LED packaging structure with glue-oil separation.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A glue-oil separated deep ultraviolet LED packaging structure comprises a ceramic substrate, a light-emitting device, a filling liquid, a curing glue and a spherical lens. The light-emitting device is arranged at the center of the ceramic substrate, the curing glue is arranged on the inner side of the spherical lens, the spherical lens is mounted on the ceramic substrate, and the filling liquid is arranged between the curing glue and the light-emitting device.

[0006] It also includes a positive electrode, a negative electrode and a heat dissipation layer, which are respectively arranged at the bottom of the ceramic substrate, and the positive electrode, the negative electrode and the heat dissipation layer are all electrically connected to the light-emitting device through the ceramic substrate.

[0007] The ceramic substrate is cylindrical or square, a ceramic substrate dam is provided in an annular shape at the edge of the ceramic substrate, and the spherical lens is bonded to the ceramic substrate dam.

[0008] The light emitting device adopts a deep ultraviolet LED chip.

[0009] The density of the filling liquid is lower than the density of the curing glue, and the refractive index of the filling liquid is higher than the refractive index of the curing glue and lower than the refractive index of the light emitting device.

[0010] The curing glue is LED silicone, and the curing condition of the LED silicone is 150° C.×2h.

[0011] The filling liquid is a silicon dioxide filling liquid or a nano ZnO sol, and the filling liquid is completely in contact with the curing glue.

[0012] The material of the ceramic substrate is aluminum nitride.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model cures glue on the spherical lens, adheres quartz glass to the dam of the ceramic substrate, fills liquid between the top of the light-emitting device and the spherical lens, and the filled liquid is completely fitted with the top of the chip and the lens, wherein the refractive index of the filled liquid is between the light-emitting device and the cured glue, thereby realizing a gradual output of the light refractive index and achieving a packaging structure with a high light output rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Among them: 1 is a ceramic substrate, 2 is a ceramic substrate dam, 3 is a light-emitting device, 4 is a filling liquid, 5 is a curing glue, 6 is a spherical lens, 7 is a positive electrode, 8 is a negative electrode, and 9 is a heat dissipation layer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. These descriptions are only to further illustrate the features and advantages of the utility model, rather than to limit the claims of the utility model. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0020] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In this embodiment, if Figure 1 As shown, it includes a ceramic substrate 1, a light-emitting device 3, a filling liquid 4, a curing glue 5 and a spherical lens 6. The aluminum nitride part of the ceramic substrate 1 has excellent thermal conductivity, and transfers the heat emitted by the light-emitting device 3 to the lamp bead pad. The ceramic substrate dam 2 has a small step for carrying the spherical lens 6. The light-emitting device 3 has a sterilization and disinfection effect, and the light-emitting device 3 preferably uses a deep ultraviolet LED chip. The filling liquid 4 fills the cavity formed by the ceramic substrate 1 and the spherical lens 6. The density of the filling liquid 4 is less than the density of the curing glue 5. The refractive index of the filling liquid 4 is between the light-emitting device 3 and the curing glue 5, forming a light transmission path of the light-emitting device 3-filling liquid 4-curing glue 5-spherical lens 6, which effectively improves the ultraviolet radiation efficiency. The curing glue 5 can bond the ceramic substrate 1 and the spherical lens 6 together to form a closed cavity, which effectively protects the chip. The spherical lens 6 can extract a part of the ultraviolet light emitted by the light-emitting device 3, and form a closed cavity with the ceramic substrate 1 to protect the service life of the chip. The light emitting device 3 is electrically connected to the light emitting device 3 through the positive electrode 7, the negative electrode 8 and the heat dissipation layer 9 through the ceramic substrate 1, and the light emitting device 3 is connected to the lamp bead pad through the positive electrode 7, the negative electrode 8 and the heat dissipation layer 9.

[0023] Further, preferably, the curing glue 5 is LED silicone, and the curing condition of LED silicone is: 1500°C×2h. The filling liquid 4 is silicon dioxide filling liquid or nano ZnO sol, and the filling liquid 4 is completely attached to the curing glue 5. The material of the ceramic substrate 1 is aluminum nitride.

[0024] Compared with the common liquid packaging process, this embodiment separates the curing glue 5 and the filling liquid 4 by curing the glue in advance, which not only prevents the curing glue 5 from covering the surface of the light-emitting device 3, but also ensures that the filling liquid 4 fills the entire cavity, and also ensures that the filling liquid 4 can contact the light-emitting device 3 and the spherical lens 6, so that the refractive index of the light-emitting line gradually decreases, reduces the absorption and reflection of light, and improves the light-emitting efficiency. The specific process method is: first, fill the spherical lens with glue, and bake and cure it to make the glue solid and bonded to the lens. Secondly, fill the liquid in the cavity surrounded by the aluminum nitride bracket dam, the height is lower than the light-emitting device, and then the filling liquid is applied directly above the light-emitting device. Finally, the quartz glass is bonded to the ceramic substrate dam, and the filling liquid above the light-emitting device will fit with the curing glue on the spherical lens, so as to achieve complete bonding between the light-emitting device, the filling liquid and the lens.

[0025] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A deep ultraviolet LED packaging structure with rubber-oil separation, characterized in that: The invention comprises a ceramic substrate (1), a light emitting device (3), a filling liquid (4), a curing glue (5) and a spherical lens (6), wherein the light emitting device (3) is arranged at the center of the ceramic substrate (1), the curing glue (5) is arranged on the inner side of the spherical lens (6), the spherical lens (6) is mounted on the ceramic substrate (1), and the filling liquid (4) is arranged between the curing glue (5) and the light emitting device (3).

2. The deep ultraviolet LED packaging structure with rubber-oil separation according to claim 1, characterized in that: It also comprises a positive electrode (7), a negative electrode (8) and a heat dissipation layer (9), wherein the positive electrode (7), the negative electrode (8) and the heat dissipation layer (9) are respectively arranged at the bottom of the ceramic substrate (1), and the positive electrode (7), the negative electrode (8) and the heat dissipation layer (9) all pass through the ceramic substrate (1) to be electrically connected to the light-emitting device (3).

3. The deep ultraviolet LED packaging structure with rubber-oil separation according to claim 1, characterized in that: The ceramic substrate (1) is cylindrical or square, a ceramic substrate dam (2) is provided in an annular shape at the edge of the ceramic substrate (1), and the spherical lens (6) is bonded to the ceramic substrate dam (2).

4. The deep ultraviolet LED packaging structure with rubber-oil separation according to claim 1, characterized in that: The light emitting device (3) adopts a deep ultraviolet LED chip.

5. The deep ultraviolet LED packaging structure with rubber-oil separation according to claim 1, characterized in that: The density of the filling liquid (4) is lower than the density of the curing glue (5); the refractive index of the filling liquid (4) is higher than the refractive index of the curing glue (5) and lower than the refractive index of the light emitting device (3).

6. The deep ultraviolet LED packaging structure with rubber-oil separation according to claim 1, characterized in that: The curing glue (5) is LED silicone, and the curing conditions of the LED silicone are 150° C.×2h.

7. The deep ultraviolet LED packaging structure with rubber-oil separation according to claim 1, characterized in that: The filling liquid (4) is a silicon dioxide filling liquid or a nano ZnO sol, and the filling liquid (4) is completely in contact with the curing glue (5).

8. The deep ultraviolet LED packaging structure with rubber-oil separation according to claim 1, characterized in that: The material of the ceramic substrate (1) is aluminum nitride.

Images