Red-green full-core-shell structure quantum dot WLED (White Light Emitting Diode) device
By using a red and green full core-shell structure quantum dot film in WLED devices and setting reflection and absorption layers on the PCB board, the problem of blue light transmitting through the PCB board is solved, achieving higher quality white light emission.
Patent Information
- Application Number
- CN202422170920.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In existing WLED devices, blue light transmits through the light-transmitting PCB board, causing a small part of the blue light to be mixed with in white light, affecting the luminescence quality.
A red and green full core-shell structure quantum dot film is adopted, and a reflection layer and an absorption layer are provided on the wall of the mounting groove of the PCB board. The reflection layer and the absorption layer are located below the quantum dot film. The reflection layer is inclined, and the absorption layer is inclined close to the center of the PCB board, with an angle of 120 degrees. The absorption layer contains a blue light absorber to reduce the transmission of blue light through the PCB board.
It effectively reduces the miscellaneous blue light in WLED light and improves the luminous quality.
Smart Images
Figure CN223182594U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of WLED luminescence, in particular to a red and green full core-shell structure quantum dot WLED device. Background Art
[0002] WLED devices have become the main light source for lighting, display and other fields due to their high brightness, high efficiency, high color rendering index and adjustable color temperature. Existing WLED devices usually use blue light.
[0003] Existing WLED devices mainly include a PCB board, a blue light LED chip arranged on the PCB board, and a red and green quantum dot film encapsulated above the blue light LED chip. The PCB board has a groove for accommodating the blue light LED chip, and the blue light LED chip is installed in the groove. The blue light emitted by the blue light LED chip passes through the red and green quantum dot film, and the blue light and the red and green quantum dots combine to emit white light. However, existing WLED devices usually use a PCB board with a certain degree of light transmittance. In addition to being emitted by the blue light LED chip to the red and green quantum dot film and combining with the red and green quantum dots, the blue light will also pass through the PCB board, resulting in a small amount of blue light mixed in the white light emitted by the entire WLED, affecting the luminous quality. Utility Model Content
[0004] Based on the technical problems existing in the above-mentioned prior art, the utility model provides a red and green full core-shell structure quantum dot WLED device, which can reduce the small amount of blue light mixed in the light emitted by the WLED, thereby improving the luminous quality.
[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: providing a red and green full core-shell structure quantum dot WLED device, comprising a PCB board, a blue light LED chip, and a red and green full core-shell structure quantum dot film arranged above the blue light LED chip, wherein the PCB board is provided with a mounting groove, and a reflective layer and an absorption layer are sequentially provided on the groove wall of the mounting groove, wherein the reflective layer and the absorption layer are both located below the red and green full core-shell structure quantum dot film, and the absorption layer is located between the reflective layer and the red and green full core-shell structure quantum dot film. After light is emitted from the blue light LED chip, it is reflected by the reflective layer to the red and green full core-shell structure quantum dot film, or is absorbed by the absorption layer, or directly reaches the red and green full core-shell structure quantum dot film.
[0006] Furthermore, the reflective layer is arranged at an angle.
[0007] Furthermore, one end of the reflective layer close to the red and green full core-shell structure quantum dot film is farther away from the central axis of the PCB board than the other end of the reflective layer far away from the red and green full core-shell structure quantum dot film.
[0008] Further, the absorption layer is inclined.
[0009] Further, one end of the absorption layer close to the red-green all-core-shell structure quantum dot film is closer to the central axis of the PCB board than the other end of the absorption layer far from the red-green all-core-shell structure quantum dot film.
[0010] Further, the included angle between the absorption layer and the reflection layer is 120 degrees.
[0011] Further, the distance between the red-green all-core-shell structure quantum dot film and the top of the blue LED chip is 3 mm - 5 mm.
[0012] Further, the red-green all-core-shell structure quantum dot WLED device further includes a metal substrate connected to the PCB. The blue LED chip is provided with a first lead and a second lead, and both the first lead and the second lead are electrically connected to the metal substrate.
[0013] Further, a blue light absorber is provided in the absorption layer.
[0014] Further, rare earth phosphors are also provided in the red-green all-core-shell structure quantum dot film.
[0015] The beneficial effects of the present utility model are as follows: A red-green all-core-shell structure quantum dot WLED device is provided, including a PCB board, a blue LED chip, and a red-green all-core-shell structure quantum dot film disposed above the blue LED chip. An installation groove is formed on the PCB board, and a reflection layer and an absorption layer are sequentially provided on the groove wall of the installation groove. The reflection layer and the absorption layer are both located below the red-green all-core-shell structure quantum dot film, and the absorption layer is located between the reflection layer and the red-green all-core-shell structure quantum dot film. After the light is emitted from the blue LED chip, it can be reflected by the reflection layer to the red-green all-core-shell structure quantum dot film, or absorbed by the absorption layer, or directly reach the red-green all-core-shell structure quantum dot film. The blue light that does not reach the red-green all-core-shell structure quantum dot film can be reflected by the reflection layer on the installation groove to the red-green all-core-shell structure quantum dot film or absorbed by the absorption layer, rather than passing through the PCB board. Thus, it is possible to reduce a small part of the blue light mixed in the light emitted by the WLED, thereby improving the light-emitting quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present utility model will be further described below with reference to the drawings and embodiments.
[0017] In the figure: Figure 1 is an overall structure diagram of a red-green all-core-shell structure quantum dot WLED device provided by the present utility model;
[0018] Figure 2 isFigure 1 Optical path diagram of the red-green all-core-shell structure quantum dot WLED device shown
[0019] Description of reference numerals: 100, red-green all-core-shell structure quantum dot WLED device; 10, PCB board; 11, mounting groove; 111, reflective layer; 112, absorption layer; 20, blue LED chip; 21, first pin; 22, second pin; 30, red-green all-core-shell structure quantum dot thin film; 40, metal substrate Specific embodiments
[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic of the present utility model in a schematic way, so it only shows the components related to the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model
[0021] Please refer to Figure 1-2 , a red-green all-core-shell structure quantum dot WLED device 100, including a PCB board 10, a blue LED chip 20, a red-green all-core-shell structure quantum dot thin film 30 disposed above the blue LED chip 20, and a metal substrate 40. Specifically, in this embodiment, the metal substrate 40 and the PCB board 10 are connected by injection molding. The material of the PCB board 10 is polycarbonate, and a plurality of blue LED chips 20 are provided Figure 1 The figure shows a front view of the red-green all-core-shell structure quantum dot WLED device 100 shown in the present utility model. In a side view of the red-green all-core-shell structure quantum dot WLED device 100 not shown in the present utility model, several blue LED chips 20 are arranged in parallel along the width direction of the PCB board 10
[0022] The PCB board 10 is provided with a mounting groove 11, and a reflective layer 111 and an absorption layer 112 are sequentially provided on the groove wall of the mounting groove 11. Specifically, in this embodiment, the specific structure of the reflective layer 111 is a polyethylene terephthalate film layer with a metal reflective coating on the surface. The included angle between the absorption layer 112 and the reflective layer 111 is 120 degrees
[0023] Both the reflective layer 111 and the absorption layer 112 are located below the red-green full core-shell structure quantum dot film 30, and the absorption layer 112 is located between the reflective layer 111 and the red-green full core-shell structure quantum dot film 30. Specifically, in this embodiment, the ratio of the length of the absorption layer 112 to the length of the reflective layer 111 is 1:4. The setting of the absorption layer 112 can enable a small part of the blue light that cannot be reflected onto the red-green full core-shell structure quantum dot film 30 due to being parallel to the reflective layer 111 and cannot directly reach the red-green full core-shell structure quantum dot film 30 to be absorbed, further reducing the situation where the blue light leaks out from the PCB board 10.
[0024] The reflective layer 111 is inclined. Further, in this embodiment, the end of the reflective layer 111 close to the red-green full core-shell structure quantum dot film 30 is farther from the central axis of the PCB board 10 than the end of the reflective layer 111 far from the red-green full core-shell structure quantum dot film 30.
[0025] The absorption layer 112 is inclined. Further, in this embodiment, the end of the absorption layer 112 close to the red-green full core-shell structure quantum dot film 30 is closer to the central axis of the PCB board 10 than the end of the absorption layer 112 far from the red-green full core-shell structure quantum dot film 30.
[0026] The absorption layer 112 is provided with a blue light absorber, and the red-green full core-shell structure quantum dot film 30 is also provided with rare earth phosphors. Specifically, the blue light absorber in this embodiment is any blue light absorber that can be realized in the prior art, so it will not be elaborated here.
[0027] Specifically, in this embodiment, the red-green full core-shell structure quantum dot film 30 is prepared by supersaturated crystallization to scale high-performance quantum dot materials. Utilizing the low solubility of the quantum dot precursor monomers in a specific solvent, it reaches a supersaturated state and recrystallizes to precipitate, realizing a core-shell structure with quantum dot crystal nuclei and an organic ligand shell, and improving the stability of the quantum dots. At the same time, after the core-shell structure quantum dots in the red-green full core-shell structure quantum dot film 30 are mixed or pinned with rare earth phosphors, the quantum dots are wrapped with alumina and silica, and then changed from a liquid state to a flexible transparent red-green full core-shell structure quantum dot color conversion film.
[0028] The rare earth phosphors are any rare earth phosphors that can meet the requirements of the above preparation process in the prior art, so they will not be elaborated here.
[0029] The distance between the top of the red-green full core-shell structure quantum dot film 30 and the blue LED chip 20 is 3 mm - 5 mm. Preferably, in this embodiment, the distance between the top of the red-green full core-shell structure quantum dot film 30 and the blue LED chip 20 is 4 mm.
[0030] The blue light LED chip 20 is provided with a first pin 21 and a second pin 22, and both the first pin 21 and the second pin 22 are electrically connected to the metal substrate 40. Specifically, in this embodiment, the electrodes corresponding to the first pin 21 and the second pin 22 are opposite. If the first pin 21 is the positive pin, the second pin 22 is the negative pin; if the first pin 21 is the negative pin, the second pin 22 is the positive pin.
[0031] Specifically, Figure 2 Only the optical path from the light emitted from the blue light LED chip 20 towards the bottom to the red and green all-core-shell structure quantum dot film 30 is shown. The optical path of the light in the red and green all-core-shell structure quantum dot film 30 is relatively complex and not easy to show.
[0032] Beneficial effects: After the light is emitted from the blue light LED chip 20, it can be reflected to the red and green all-core-shell structure quantum dot film 30 through the reflective layer 111, or absorbed by the absorption layer 112, or directly reach the red and green all-core-shell structure quantum dot film 30. The blue light that does not reach the red and green all-core-shell structure quantum dot film 30 can be reflected to the red and green all-core-shell structure quantum dot film 30 through the reflective layer 111 on the mounting groove 11 or absorbed by the absorption layer 112, rather than passing through the PCB board 10. Thus, it is possible to reduce the small part of blue light mixed in the light emitted by the WLED, thereby improving the light-emitting quality.
[0033] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" 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, it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0034] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.
[0035] Based on the inspiration of the ideal embodiments of the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the scope of the present utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A quantum dot WLED device with a red and green all-core-shell structure, characterized in that: It includes a PCB board, a blue LED chip, and a red-green full-core-shell structure quantum dot thin film disposed above the blue LED chip. An installation groove is formed on the PCB board, and a reflective layer and an absorption layer are sequentially provided on the groove wall of the installation groove. Both the reflective layer and the absorption layer are located below the red-green full-core-shell structure quantum dot thin film, and the absorption layer is located between the reflective layer and the red-green full-core-shell structure quantum dot thin film. After the light is emitted from the blue LED chip, it is reflected by the reflective layer to the red-green full-core-shell structure quantum dot thin film, or absorbed by the absorption layer, or directly reaches the red-green full-core-shell structure quantum dot thin film.
2. The red and green all-core-shell structure quantum dot WLED device according to claim 1, wherein: The reflective layer is inclined.
3. The red and green all-core-shell structure quantum dot WLED device according to claim 2, wherein: One end of the reflective layer close to the red-green full-core-shell structure quantum dot thin film is farther from the central axis of the PCB board than the other end of the reflective layer far from the red-green full-core-shell structure quantum dot thin film.
4. The all-core-shell structured quantum dot WLED device with red and green colors according to claim 3, characterized in that: The absorption layer is inclined.
5. The red-green all-core-shell structure quantum dot WLED device according to claim 4, wherein: One end of the absorption layer close to the red-green full-core-shell structure quantum dot thin film is closer to the central axis of the PCB board than the other end of the absorption layer far from the red-green full-core-shell structure quantum dot thin film.
6. The all-core-shell structure quantum dot WLED device with red and green colors according to claim 5, characterized in that: The included angle between the absorption layer and the reflective layer is 120 degrees.
7. The red and green all-core-shell structure quantum dot WLED device according to claim 6, characterized in that: The distance between the top of the red-green full-core-shell structure quantum dot thin film and the blue LED chip is 3 mm - 5 mm.
8. The all-core-shell structured quantum dot WLED device according to claim 1, wherein: The red-green full-core-shell structure quantum dot WLED device further includes a metal substrate connected to the PCB. The blue LED chip is provided with a first pin and a second pin, and both the first pin and the second pin are electrically connected to the metal substrate.
9. The all-core-shell-structured quantum dot WLED device with red and green colors according to claim 1, characterized in that: A blue light absorber is provided in the absorption layer.
10. The all-core-shell structure quantum dot WLED device with red and green colors according to claim 1, characterized in that: Rare earth phosphors are further provided in the red-green full-core-shell structure quantum dot thin film.