White light chip

Abstract

The utility model provides a white light chip, comprising: a glass substrate, the glass substrate comprising a first surface and a second surface opposite to the first surface, the first surface comprising at least one first groove recessed relative to the first surface; a light emitting unit located in each of the first grooves, the light emitting surface of the light emitting unit facing the second surface; a reflector layer located on the second surface, the reflector layer comprising a plurality of light-transmitting holes. The utility model solves the problem of large amount of quantum dots and high cost when adjusting the white light spectrum of the white light chip.

Description

Technical Field

[0001] The utility model relates to the field of semiconductors, in particular to a white light chip. Background Art

[0002] In traditional white light LED chips, the spectrum of white light emitted by the white light chip is usually adjusted by controlling the thickness of the phosphor. Therefore, when a high conversion rate is required, a thicker quantum dot layer needs to be set. However, setting a thicker quantum dot layer will increase the cost.

[0003] Based on the above technical situation, the traditional white light chip design has the problem of large amount of quantum dots used and high cost when the white light spectrum of the white light chip needs to be adjusted. Utility Model Content

[0004] The technical problem solved by the utility model is that when adjusting the spectrum of a white light chip, there is a problem of large amount of quantum dots used and high cost. A white light chip is provided to solve the problem of large amount of quantum dots used and high cost when adjusting the white light spectrum of a white light chip.

[0005] In order to solve the above technical problems, the present invention provides a white light chip, including:

[0006] A glass substrate, the glass substrate comprising a first surface and a second surface opposite to the first surface, the first surface comprising at least one first groove recessed relative to the first surface;

[0007] A light emitting unit located in each of the first grooves, wherein the light emitting surface of the light emitting unit faces the second surface; and a reflector layer located on the second surface, wherein the reflector layer includes a plurality of light-transmitting holes.

[0008] Optionally, it further includes: at least one second groove recessed relative to the second surface, and the reflector layer is formed on the second surface.

[0009] Optionally, the reflector layer is also formed on the bottom and side walls of the second groove.

[0010] Optionally, the light transmittance of the glass substrate in the blue light band is greater than 90%.

[0011] Optionally, the light transmittance of the reflector layer is 10% to 90%, and the reflectivity is 10% to 90%.

[0012] Optionally, a width of the bottom of the first groove parallel to the first surface is greater than 0.01 mm.

[0013] Optionally, the spacing between the tops of a plurality of the first grooves is greater than 0.1 mm.

[0014] Optionally, an angle between the side wall of the first groove and the bottom of the first groove is greater than 30°.

[0015] Optionally, a width of the bottom of the second groove parallel to the second surface is greater than 0.01 mm.

[0016] Optionally, the spacing between the tops of a plurality of the second grooves is greater than 0.005 mm.

[0017] Optionally, an angle between the side wall of the second groove and the bottom of the second groove is greater than 30°.

[0018] Optionally, it further includes: an insulating layer located on the first surface, the insulating layer filling the first grooves and covering the glass substrate between a plurality of the first grooves; and an electrical connection structure connecting the light-emitting units.

[0019] Optionally, it further includes: a first reflective layer located on the first surface, wherein the first reflective layer is formed on the surface of the glass substrate between the first grooves.

[0020] Optionally, the reflectivity of the first reflective layer is 90% to 100%.

[0021] Optionally, the light-emitting unit includes a blue light chip and a quantum dot layer.

[0022] Optionally, the quantum dot layer includes a red quantum dot layer and a green quantum dot layer.

[0023] Optionally, the quantum dot layer includes a yellow quantum dot layer.

[0024] Optionally, when the first surface includes at least three first grooves, the light emitting unit includes: a red light chip, a green light chip, and a blue light chip respectively located in each of the first grooves.

[0025] Optionally, a duty ratio of the plurality of light-transmitting holes in the reflector layer is positively correlated with a color gamut of white light emitted by the white light chip.

[0026] Optionally, changes in the thickness and refractive index of the reflector layer cause changes in the color gamut of white light emitted by the white light chip.

[0027] Compared with the prior art, the technical solution of the embodiment of the utility model has the following beneficial effects:

[0028] In the white light chip of the technical solution of the utility model, a glass substrate having at least one first groove recessed relative to the first surface is provided, and a light-emitting unit with a light-emitting surface facing the second surface is arranged in each of the first grooves, and a reflector layer having a plurality of light-transmitting holes is arranged on the second surface. Firstly, the glass substrate having a plurality of first grooves increases the light output angle of the white light chip. Secondly, in the technical solution of the utility model, the white light chip is formed based on the structure of the reflector layer arranged on the second surface of the glass substrate, and the reflector layer includes a plurality of light-transmitting holes. Since the light-transmitting holes are arranged, the color gamut of the white light emitted by the light-emitting surface can be changed, and the color gamut of the white light emitted by the white light chip is different due to different duty ratios of the light-transmitting holes, so the color gamut of the white light chip can be adjusted by changing the duty ratio of the light-transmitting holes arranged in the reflector layer.

[0029] Furthermore, a plurality of second grooves recessed relative to the second surface are also provided on the second surface of the glass substrate, the reflector layer is formed on the second surface, and a plurality of convex structures are formed on the glass substrate between the plurality of second grooves recessed relative to the second surface. These convex structures can play a focusing role on the light emitting surface side, thereby improving the resolution of the white light chip, and also further increasing the light emitting angle of the white light chip.

[0030] Furthermore, a first reflective layer is provided on the first surface of the glass substrate, thereby increasing the luminous brightness of the white light chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a white light chip provided by an embodiment of the utility model. Figure 1 ;

[0032] Figure 2 This is a schematic diagram of the structure of a white light chip provided by an embodiment of the utility model. Figure 2 ;

[0033] Figure 3 It is a structural schematic diagram of a light-emitting unit provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0034] As described in the background art, when adjusting the white light spectrum of a white light chip, there are problems such as large amount of quantum dots used and high cost. This will be described in detail below with reference to the accompanying drawings.

[0035] In traditional white light chips, when less blue light output is needed, the thickness of quantum dot layers of other colors is increased to improve the conversion rate of other colors. This method of adjusting the color gamut requires a large amount of quantum dot layers and increases costs.

[0036] In order to solve the above problems, the present invention provides a white light chip. Figure 1A white light chip according to an embodiment of the utility model comprises:

[0037] A glass substrate, the glass substrate comprising a first surface and a second surface opposite to the first surface, the first surface comprising at least one first groove recessed relative to the first surface; a light emitting unit located in each of the first grooves, the light emitting surface of the light emitting unit facing the second surface; and a reflector layer located on the second surface, the reflector layer comprising a plurality of light-transmitting holes.

[0038] A glass substrate having at least one first groove recessed relative to a first surface is provided, and a light-emitting unit with a light-emitting surface facing the second surface is arranged in each of the first grooves, and a reflector layer having a plurality of light-transmitting holes is arranged on the second surface. In the technical solution of the utility model, a white light chip is formed based on the structure of the reflector layer arranged on the second surface of the glass substrate, and the reflector layer includes a plurality of light-transmitting holes. Since the light-transmitting holes are arranged, the color gamut of the white light emitted by the light-emitting surface can be changed, and the color gamut of the white light emitted by the white light chip is also different due to different duty ratios of the light-transmitting holes, so the color gamut of the white light chip can be adjusted by changing the duty ratio of the light-transmitting holes arranged in the reflector layer. The white light chip based on the glass substrate having a plurality of first grooves provided by the utility model also increases the light emission angle of the white light chip.

[0039] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] Figure 1 It is a schematic diagram of the structure of a white light chip provided in one embodiment of the utility model.

[0041] Please refer to Figure 1 The white light chip comprises: a glass substrate 101, wherein the glass substrate 101 comprises a first surface 1011 and a second surface 1012 opposite to the first surface 1011, wherein the first surface 1011 comprises at least one first groove 10111 recessed relative to the first surface 1011.

[0042] In one embodiment, the light transmittance of the glass substrate in the blue light band is greater than 90%.

[0043] In one embodiment, a thickness d1 between the first surface and the second surface of the glass substrate is greater than 0.1 mm.

[0044] The light emitting units 105 located in each of the first grooves 10111 have light emitting surfaces facing the second surface 1012 .

[0045] The light emitting units 105 are disposed in the first grooves 10111 of the glass substrate 101 , thereby increasing the light emission angle of the white light chip.

[0046] In one embodiment, a width d2 of the bottom of the first groove 10111 parallel to the first surface 1011 is greater than 0.01 mm.

[0047] In one embodiment, the distance d3 between the tops of the plurality of first grooves 10111 is greater than 0.1 mm.

[0048] In one embodiment, an angle θ1 between the side wall of the first groove 10111 and the bottom of the first groove 10111 is greater than 30°.

[0049] Please refer to Figure 3 In one embodiment, each of the light-emitting units 105 includes a blue light chip and a quantum dot layer 107 .

[0050] In one embodiment, the thickness of the quantum dot layer 107 is less than 2 microns.

[0051] In one embodiment, the quantum dot layer 107 includes a red quantum dot layer and a green quantum dot layer.

[0052] In another embodiment, the quantum dot layer 107 includes a yellow quantum dot layer.

[0053] In one embodiment, the blue light chip 105 includes: an N-type epitaxial layer 1051; a blue quantum well light-emitting layer 1052, a P-type epitaxial layer 1053, a transparent conductive layer 1054, and a second reflector layer 1055 sequentially stacked on a portion of the N-type epitaxial layer 1051, and exposing a portion of the N-type epitaxial layer 1051; an N-electrode metal layer 1057 and a P-electrode metal layer 1056; wherein the P-electrode metal layer 1056 is formed on the surface of the P-type epitaxial layer 1053; and the N-electrode metal layer 1057 is formed on the surface of the exposed portion of the N-type epitaxial layer 1051. One side of the N-type epitaxial layer 1051 is formed in the blue light chip as the light-emitting surface of the light-emitting unit 105.

[0054] In one embodiment, the white light chip further includes: a silica gel layer 106 formed between the quantum dot layer 107 and the N-type epitaxial layer 1051 in the blue light chip 105 .

[0055] In one embodiment, the white light chip further comprises a bonding layer, and the bonding layer is used to bond the glass substrate 101 and the quantum dot layer 107.

[0056] In one embodiment, when the first surface 1011 includes at least three first grooves, the light emitting unit 105 includes: a red light chip, a green light chip, and a blue light chip respectively located in each of the first grooves.

[0057] Please continue to refer to Figure 1 The white light chip further includes: a reflector layer 102 located on the second surface 1012 , and the reflector layer 102 includes a plurality of light-transmitting holes 1021 .

[0058] The reflector layer includes a plurality of light-transmitting holes. Since the light-transmitting holes can be provided to change the color gamut of white light emitted by the light-emitting surface, and the color gamut of white light emitted by the white light chip is different due to different duty ratios of the light-transmitting holes, the color gamut of the white light chip can be adjusted by changing the duty ratio of the light-transmitting holes provided in the reflector layer.

[0059] In a typical example, the reflector layer 102 is a DBR reflector layer.

[0060] Since the DBR reflector layer reflects blue light and transmits yellow light, green light and red light, and a number of light-transmitting holes are set in the reflector layer to increase the transmittance of the reflector layer to blue light, the duty cycle of the light-transmitting holes in the DBR reflector layer can be adjusted to adjust the transmittance of the blue light part emitted by the white light chip, thereby adjusting the color range of the white light. In addition, the transmittance and thickness of the DBR reflector layer are related to the light-emitting color range of the white light chip. Therefore, the white light chip of the technical solution of the utility model can also be set with white light chips of different light-emitting color ranges by having DBR reflector layers with different transmittances or DBR reflector layers with different thicknesses.

[0061] In one embodiment, the white light chip further includes: an insulating layer 104 located on the first surface 1011, the insulating layer 104 fills the first grooves 10111 and covers the glass substrate 101 between the first grooves 10111; and an electrical connection structure connecting the light-emitting unit 105. The electrical connection structure is designed according to actual needs, and the utility model will not be described in detail here.

[0062] In one embodiment, the white light chip further includes: a first reflective layer 103 located on the first surface 1011 , wherein the first reflective layer 103 is formed on the surface of the glass substrate 101 between a plurality of the first grooves 10111 .

[0063] In one embodiment, the first reflective layer may be disposed on the second surface.

[0064] In a preferred embodiment, the first reflective layer is arranged on the second surface, and the sidewalls and bottom of the second groove.

[0065] A first reflective layer is arranged on the first surface of the glass substrate to increase the luminous brightness of the white light chip.

[0066] In one embodiment, the reflectivity of the first reflective layer is greater than 0.1 mm. For a light source of a certain light-emitting unit, the reflectivity of the first reflective layer is greater than 95% of the wavelength band of the light source.

[0067] In summary, a white light chip provided in an embodiment of the utility model includes: a glass substrate, the glass substrate includes a first surface and a second surface opposite to the first surface, the first surface includes at least one first groove recessed relative to the first surface. The light-emitting unit is arranged in each first groove of the glass substrate, thereby increasing the light output angle of the white light chip. The white light chip also includes: a reflector layer located on the second surface, wherein the reflector layer includes a plurality of light-transmitting holes. The reflector layer includes a plurality of light-transmitting holes. Since the light-transmitting holes are arranged, the color gamut of the white light emitted by the light-emitting surface can be changed, and the color gamut of the white light emitted by the white light chip is also different due to different duty ratios of the light-transmitting holes, so that the color gamut of the white light chip can be adjusted by changing the duty ratio of the light-transmitting holes arranged in the reflector layer. The first reflective layer is arranged on the first surface of the glass substrate, thereby increasing the luminous brightness of the white light chip.

[0068] Figure 2 1 is a schematic diagram of the structure of a white light chip provided by another embodiment of the present invention. The difference between this embodiment and the above embodiment is that, in this embodiment, the glass substrate further includes at least one second groove recessed relative to the second surface.

[0069] Please refer to Figure 2 The white light chip comprises: a glass substrate 101, wherein the glass substrate 101 comprises a first surface 1011 and a second surface 1012 opposite to the first surface 1011, wherein the first surface 1011 comprises at least one first groove 10111 recessed relative to the first surface 1011.

[0070] In one embodiment, the white light chip further comprises: a reflector layer 102 located on the second surface 1012, wherein the reflector layer 102 comprises a plurality of light-transmitting holes 1021. In a typical example, the reflector layer 102 is a DBR reflector layer.

[0071] In one embodiment, the white light chip further includes: an insulating layer 104 located on the first surface 1011, the insulating layer 104 fills the first grooves 10111 and covers the glass substrate 101 between the first grooves 10111; and an electrical connection structure connecting the light-emitting unit 105. The electrical connection structure is designed according to actual needs, and the utility model will not be described in detail here.

[0072] In one embodiment, the white light chip further includes: a first reflective layer 103 located on the first surface 1011 , wherein the first reflective layer 103 is formed on the surface of the glass substrate 101 between a plurality of the first grooves 10111 .

[0073] The first reflective layer is arranged on the first surface of the glass substrate to increase the luminous brightness of the white light chip. In one embodiment, the reflectivity of the first reflective layer is 90% to 100%.

[0074] The light transmittance of the glass substrate, the thickness between the first surface and the second surface of the glass substrate, the width of the bottom of the first groove 10111 parallel to the direction of the first surface 1011, the spacing between the tops of the first grooves 10111, the angle between the side wall of the first groove 10111 and the bottom of the first groove 10111, the specific structure of each of the light-emitting units, etc. are the same as those of the aforementioned embodiment of the utility model, and the utility model will not be repeated here. In one embodiment, it also includes: at least one second groove 10121 recessed relative to the second surface 1012, and the reflector 102 layer is formed on the second surface 1012.

[0075] In this embodiment, a plurality of second grooves recessed relative to the second surface are also provided on the second surface of the glass substrate, the reflector layer is formed on the second surface, and a plurality of convex structures are formed on the glass substrate between the plurality of second grooves recessed relative to the second surface. These convex structures can play a focusing role on the light emitting surface side, thereby improving the resolution of the white light chip, and also further increasing the light emitting angle of the white light chip.

[0076] In one embodiment, the reflector layer 102 is also formed on the bottom and sidewalls of the second groove 10121 .

[0077] In one embodiment, a width d4 of the bottom of the second groove 10121 parallel to the second surface 1012 is greater than 0.01 mm.

[0078] In one embodiment, the spacing d5 between the tops of a plurality of the second grooves 10121 is greater than 0.005 mm.

[0079] In one embodiment, an angle θ2 between the side wall of the second groove 10121 and the bottom of the second groove 10121 is greater than 30°.

[0080] In summary, the white light chip provided in this embodiment of the utility model sets the light-emitting unit in each first groove of the glass substrate, thereby increasing the light output angle of the white light chip, and the technical solution can also adjust the color gamut of the white light chip by changing the duty cycle of the light-transmitting holes set in the reflector layer. Similarly, a first reflective layer is set on the first surface of the glass substrate to increase the luminous brightness of the white light chip. In this embodiment, a plurality of second grooves recessed relative to the second surface are added to the second surface of the glass substrate, and the reflector layer is formed on the second surface. A plurality of protruding structures are formed on the glass substrate between the plurality of second grooves recessed relative to the second surface. These protruding structures can play a focusing role on the light output side, thereby improving the resolution of the white light chip, and at the same time further increasing the light output angle of the white light chip.

[0081] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A white light chip, characterized in that: include: A glass substrate, the glass substrate comprising a first surface and a second surface opposite to the first surface, the first surface comprising at least one first groove recessed relative to the first surface; a light emitting unit located in each of the first grooves, wherein the light emitting surface of the light emitting unit faces the second surface; The reflector layer is located on the second surface, and includes a plurality of light-transmitting holes.

2. The white light chip according to claim 1, characterized in that: Also includes: At least one second groove is recessed relative to the second surface, and the reflector layer is formed on the second surface.

3. The white light chip according to claim 2, characterized in that: The reflector layer is also formed on the bottom and sidewalls of the second groove.

4. The white light chip according to claim 1, characterized in that: The light transmittance of the glass substrate in the blue light band is greater than 90%.

5. The white light chip according to claim 1, characterized in that: The light transmittance of the reflector layer is 10% to 90%, and the reflectivity is 10% to 90%.

6. The white light chip according to claim 1, characterized in that: The width of the bottom of the first groove parallel to the first surface is greater than 0.01 mm.

7. The white light chip according to claim 1, characterized in that: The spacing between the tops of the first grooves is greater than 0.1 mm.

8. The white light chip according to claim 1, characterized in that: An angle between the side wall of the first groove and the bottom of the first groove is greater than 30°.

9. The white light chip according to claim 2, characterized in that: The width of the bottom of the second groove parallel to the second surface is greater than 0.01 mm.

10. The white light chip according to claim 2, characterized in that: The spacing between the tops of a plurality of the second grooves is greater than 0.005 mm.

11. The white light chip according to claim 2, characterized in that: An angle between the side wall of the second groove and the bottom of the second groove is greater than 30°.

12. The white light chip according to claim 1, characterized in that: Also includes: an insulating layer located on the first surface, the insulating layer filling the first grooves and covering the glass substrate between a plurality of the first grooves; And an electrical connection structure connecting the light emitting units.

13. The white light chip according to claim 1 or 2, characterized in that: Also includes: The first reflective layer is located on the first surface, and the first reflective layer is formed on the surface of the glass substrate between the first grooves.

14. The white light chip according to claim 13, characterized in that: The reflectivity of the first reflective layer is 90% to 100%.

15. The white light chip according to claim 1, characterized in that: The light emitting unit includes a blue light chip and a quantum dot layer.

16. The white light chip according to claim 15, characterized in that: The quantum dot layer includes a red quantum dot layer and a green quantum dot layer.

17. The white light chip according to claim 15, characterized in that: The quantum dot layer includes a yellow quantum dot layer.

18. The white light chip according to claim 1, characterized in that: When the first surface includes at least three first grooves, the light emitting unit includes: a red light chip, a green light chip, and a blue light chip respectively located in each of the first grooves.

19. The white light chip according to claim 1, characterized in that: The duty ratio of the plurality of light-transmitting holes in the reflector layer is positively correlated with the color gamut of white light emitted by the white light chip.

20. The white light chip according to claim 1, characterized in that: Changes in the thickness and refractive index of the reflector layer cause changes in the color gamut of white light emitted by the white light chip.

Images