Light emitting device

Abstract

The utility model relates to a light-emitting device which comprises a substrate, a plurality of light-emitting elements, a plurality of phosphors and at least one spacer. The substrate defines a thickness direction; the plurality of light-emitting elements are arranged on the substrate at intervals; the plurality of phosphors are covered on the plurality of light-emitting elements along the thickness direction; the at least one spacer is arranged on the substrate and connected among the plurality of phosphors so as to isolate light rays and restrain heat conduction.

Description

Technical Field

[0001] The utility model relates to a light emitting device, and in particular to a light emitting device utilizing fluorescent materials. Background Art

[0002] Existing technologies for achieving different light colors using LED lamps mostly involve coating LED chips with fluorescent materials, so that the color light emitted by the LED chip mixes with the fluorescence emitted by the fluorescent material to emit the desired light color.

[0003] Conventional fluorescent materials are bonded to a circuit substrate equipped with multiple LED chips using adhesives. However, the multiple LED chips are prone to generating high temperatures during use, which can make it difficult for the fluorescent material to dissipate heat from the multiple LED chips. Furthermore, the commonly used adhesives are easily damaged by high temperatures, reducing their viscosity, leading to material deterioration and delamination, thus affecting the light output. Furthermore, the light from adjacent LED chips can easily interfere with each other, affecting the light output. These shortcomings present a need for improvement. Summary of the Invention

[0004] The main purpose of the utility model is to provide a light emitting device that can isolate light and suppress heat conduction.

[0005] To achieve the above objectives, the present invention provides a light-emitting device comprising: a substrate, a plurality of light-emitting elements, a plurality of phosphors, and at least one spacer. The substrate defines a thickness direction; the plurality of light-emitting elements are disposed on the substrate in a spaced-apart manner; the plurality of phosphors are disposed over the plurality of light-emitting elements along the thickness direction; and the at least one spacer is disposed on the substrate and connected between the plurality of phosphors.

[0006] Preferably, the number of the plurality of light-emitting elements is the same as the number of the plurality of phosphors, and each phosphor corresponds to one light-emitting element.

[0007] Preferably, each of the phosphors includes a plurality of phosphor particles, and the light emission wavelength of the plurality of phosphor particles is between 200 nanometers and 760 nanometers.

[0008] Preferably, a thickness of each of the phosphors is between 40 micrometers and 200 micrometers.

[0009] Preferably, the distance between two adjacent phosphors is between 10 microns and 500 microns.

[0010] Preferably, the at least one spacer circumferentially and closedly surrounds each of the phosphors, and in the thickness direction, the thickness of the at least one spacer is not less than the sum of the thickness of each of the light-emitting elements and the thickness of one of the phosphors.

[0011] Preferably, the plurality of light-emitting elements are distributed in a matrix, and an extension area of each phosphor is not smaller than an extension area of one of the light-emitting elements.

[0012] Preferably, when viewed transversely to the thickness direction, a peripheral sidewall of each phosphor extends non-parallel to the thickness direction, and the at least one spacer extends corresponding to the peripheral sidewalls.

[0013] Preferably, the at least one spacer is opaque and has a thermal conductivity lower than that of the plurality of phosphors.

[0014] Preferably, the number of the plurality of light-emitting elements is the same as the number of the plurality of phosphors, and each phosphor corresponds to a light-emitting element; each light-emitting element is a blue light LED chip; each phosphor includes a plurality of phosphor particles, and the emission wavelength of the plurality of phosphor particles is between 200 nanometers and 760 nanometers; each phosphor particle is a ceramic crystal or a glass crystal containing a rare earth oxide; a thickness of each phosphor is between 40 micrometers and 200 micrometers; each phosphor is a rectangular body, and a length and a width of each phosphor are respectively 2 millimeters; the spacing between two adjacent phosphors is between 10 micrometers and 500 micrometers; the plurality of light-emitting elements are distributed in a matrix, and an extension area of each phosphor is not less than an extension area of a light-emitting element; the at least one spacer is opaque and has a thermal conductivity lower than that of the plurality of phosphors; the at least one spacer is an integrally formed metal coating or a colloid.

[0015] The beneficial effects of the utility model are:

[0016] The light-emitting device provided by the present invention comprises a plurality of light-emitting elements spaced apart from each other on a substrate; a plurality of phosphors are coated on the plurality of light-emitting elements along the thickness direction; and at least one spacer is disposed on the substrate 10 and connected between the plurality of phosphors, thereby spacing the plurality of light-emitting elements apart to isolate light and suppress heat conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of a preferred embodiment of the utility model.

[0018] Figure 2 It is a cross-sectional view of a preferred embodiment of the present invention.

[0019] Figure 3 It is a cross-sectional view of another preferred embodiment of the present invention.

[0020] Reference numerals

[0021] 1: light-emitting device; 10: substrate; 20: light-emitting element; 30: phosphor; 30a: phosphor; 31: matrix; 32: phosphor particles; 33: peripheral sidewall; 40: spacer; 40a: spacer; T: thickness direction. DETAILED DESCRIPTION

[0022] The following examples are merely illustrative of possible implementations of the present invention and are not intended to limit the scope of protection of the present invention. The word "one" or "at least one" preceding a noun in the text does not limit the quantity and may also be "plural" according to needs. Such changes in quantity also fall within the scope of protection and are therefore clearly stated.

[0023] Please refer to Figures 1 to 2 , which shows a preferred embodiment of the present invention. The light-emitting device 1 of the present invention includes a substrate 10, a plurality of light-emitting elements 20, a plurality of phosphors 30 and at least one spacer 40.

[0024] The substrate 10 defines a thickness direction T; the plurality of light-emitting elements 20 are arranged on the substrate 10 at intervals; the plurality of phosphors 30 are covered on the plurality of light-emitting elements 20 along the thickness direction T; the at least one spacer 40 is arranged on the substrate 10 and connected between the plurality of phosphors 30, thereby separating the plurality of light-emitting elements 20 to isolate light and inhibit heat conduction.

[0025] Specifically, the plurality of light-emitting elements 20 are arranged in a matrix, and an extended area of each phosphor 30 is not less than an extended area of a light-emitting element 20. This allows light from the plurality of light-emitting elements 20 to pass through the plurality of phosphors 30 and effectively excite the phosphors 30 to produce fluorescence, resulting in improved light extraction. The at least one spacer 40 circumferentially surrounds each phosphor 30. In the thickness direction T, the thickness of the at least one spacer 40 is not less than the sum of the thickness of each light-emitting element 20 and the thickness of a phosphor 30. The spacing between two adjacent phosphors 30 ranges from 10 microns to 500 microns. The at least one spacer 40 is opaque and has a lower thermal conductivity than the thermal conductivity of the plurality of phosphors 30, thereby effectively isolating the phosphors from heat conduction and light interference, resulting in improved light extraction and durability.

[0026] In this embodiment, the at least one spacer 40 is an integrally formed metal coating or colloid. The at least one spacer 40 can be applied to the substrate 10 by spraying, coating, pasting, plating, physical or chemical vapor deposition, or other methods. This allows the plurality of phosphors 30 to be stably fixed to the substrate 10 without the use of an adhesive, and is resistant to high temperature peeling and damage. The number of the plurality of light-emitting elements 20 is the same as the number of the plurality of phosphors 30, with each phosphor 30 corresponding to one light-emitting element 20, providing excellent light and heat isolation. In other embodiments, each phosphor may correspond to a plurality of light-emitting elements, and the light-emitting device may also include a plurality of spacers, with the configuration being as desired.

[0027] Specifically, each light-emitting element 20 is a blue LED chip. Light emitted by the plurality of light-emitting elements 20 partially penetrates the plurality of phosphors 30. Each phosphor 30 comprises a matrix 31 and a plurality of phosphor particles 32 distributed within the matrix 31. The matrix 31 and the plurality of phosphor particles 32 can be formed into a solid form, for example, by high-temperature molding, which is easy to process and has excellent structural stability. The plurality of phosphor particles 32 emit light at a wavelength between 200 nm and 760 nm. This allows the blue light from the plurality of light-emitting elements 20 to mix with the fluorescence from the plurality of phosphor particles 32 to produce a variety of light colors, including white, red, yellow, and amber, with minimal light attenuation and excellent light extraction efficiency. The light-emitting device 1 can be used in, for example, but not limited to, automotive lamps, high-wattage headlights, and matrix headlights. It is easy to process and can meet various specifications. In other embodiments, each light emitting element may also use chips of other colors, and select required fluorescent particles according to needs to produce a desired light emitting effect.

[0028] In this embodiment, each phosphor particle 32 is a ceramic crystal or glass crystal containing a rare earth oxide; each phosphor 30 has a thickness between 40 microns and 200 microns (for example, but not limited to, 150 microns); each phosphor 30 is a rectangular body, with a length and a width of 2 mm, respectively. This structure is simple and allows for uniform light emission. In other embodiments, when viewed transversely to the thickness direction T, the peripheral sidewalls 33 of each phosphor 30a extend non-parallel to the thickness direction T, and the at least one spacer 40a extends correspondingly to the peripheral sidewalls 33, such as Figure 3 The sidewalls 33 of each phosphor 30a are shown extending outwardly at an angle relative to the thickness direction T, thereby guiding light outward and producing different light-emitting effects. However, the cross-sectional profile of each phosphor can also be designed to have different shapes and sizes as needed, and the sidewalls can also extend in a non-linear manner, be curved, etc., allowing for a variety of designs.

Claims

1. A light emitting device, characterized in that: include: a substrate defining a thickness direction; A plurality of light-emitting elements are disposed on the substrate at intervals; a plurality of phosphors covering the plurality of light-emitting elements along the thickness direction; and At least one spacer is disposed on the substrate and connected between the plurality of phosphors.

2. The light emitting device according to claim 1, wherein The number of the plurality of light-emitting elements is the same as the number of the plurality of phosphors, and each phosphor corresponds to one light-emitting element.

3. The light emitting device according to claim 1, wherein Each of the phosphors includes a plurality of phosphor particles, and the light emission wavelength of the plurality of phosphor particles is between 200 nanometers and 760 nanometers.

4. The light emitting device according to claim 1, wherein A thickness of each of the phosphors is between 40 micrometers and 200 micrometers.

5. The light emitting device according to claim 1, wherein The distance between two adjacent phosphors is between 10 micrometers and 500 micrometers.

6. The light emitting device according to claim 1, wherein The at least one spacer circumferentially and closedly surrounds each of the phosphors. In the thickness direction, the thickness of the at least one spacer is not less than the sum of the thickness of each of the light-emitting elements and the thickness of one of the phosphors.

7. The light emitting device according to claim 1, wherein The plurality of light-emitting elements are distributed in a matrix, and an extension area of each phosphor is not smaller than an extension area of one of the light-emitting elements.

8. The light emitting device according to claim 1, wherein Viewed transversely to the thickness direction, a peripheral sidewall of each phosphor extends non-parallel to the thickness direction, and the at least one spacer extends corresponding to the peripheral sidewalls.

9. The light emitting device according to any one of claims 1 to 8, characterized in that: The at least one spacer is light-proof and has a thermal conductivity lower than that of the plurality of phosphors.

10. The light emitting device according to claim 6, wherein The number of the plurality of light-emitting elements is the same as the number of the plurality of phosphors, and each phosphor corresponds to a light-emitting element; each light-emitting element is a blue light LED chip; each phosphor includes a plurality of phosphor particles, and the emission wavelength of the plurality of phosphor particles is between 200 nanometers and 760 nanometers; each phosphor particle is a ceramic crystal or a glass crystal containing a rare earth oxide; a thickness of each phosphor is between 40 micrometers and 200 micrometers; each phosphor is a rectangular body, and a length and a width of each phosphor are respectively 2 millimeters; the spacing between two adjacent phosphors is between 10 micrometers and 500 micrometers; the plurality of light-emitting elements are distributed in a matrix, and an extended area of each phosphor is not less than an extended area of a light-emitting element; the at least one spacer is opaque and has a thermal conductivity lower than that of the plurality of phosphors; the at least one spacer is an integrally formed metal coating or a colloid.

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