A full-spectrum LED healthy light source and device

Abstract

The present invention discloses a full-spectrum LED healthy light source and device, belonging to the technical field of LED light sources. The light source includes an excitation source purple light chip and an emission source phosphor, wherein the purple light chip is a 410-415nm chip; the emission source phosphor is 50%-60% by mass fraction of a blue phosphor with a peak wavelength of 450nm, 15%-25% of a cyan phosphor with a peak wavelength of 494nm, 4%-6% of a red phosphor with a peak wavelength of 647nm, and 12-20% of a green phosphor with a peak wavelength of 534nm. The present invention reasonably matches the RGB three primary colors through the purple light chip and the phosphor, so that the LED light source has a continuous spectrum, which is closer to the solar spectrum, and each parameter in R10-R15 is as high as 95, and the color rendering index CIR is greater than 98, which effectively reduces the proportion of blue light, thereby reducing the harm of blue light.

Description

Technical Field

[0001] The present invention belongs to the field of lighting technology, and more specifically, relates to a full-spectrum LED healthy light source and device. Background Art

[0002] With the development of LED technology, LED lamps have replaced traditional lamps and become the mainstream of the market. Because the proportion of blue light in the white light stimulated by 440-460nm LED blue light is high, it can cause damage to retinal cells, leading to decreased or even loss of vision.

[0003] Full spectrum refers to the spectrum curve that includes ultraviolet light, visible light, and infrared light, and the ratio of red, green, and blue in 380-780nm is closer to natural light, and the color rendering index is close to 100. Nowadays, people not only pursue energy saving and environmental protection for LED lighting products, but also pursue light safety and light health. Therefore, full-spectrum healthy lamp beads have become the focus of attention and research.

[0004] The patent publication number is CN208298858U, and the publication date is December 28, 2018. The utility model discloses a purple light-excited full-spectrum LED device, including a bracket, an LED chip and a fluorescent glue layer. The fluorescent glue layer includes the following components: red phosphor: nitride system CaAlSi(ON)3:Eu, green phosphor: silicate system (Ba,Si)2SiO4:Eu, blue phosphor: calcium halophosphate system Ca3(PO4)5Cl:Eu. It can output all light within the visible light wavelength range, contains rich spectral components, and the relative intensity of various color spectra is high enough, so the color rendering index is relatively high (CRI>95, and the special color rendering indexes R1 to R15 are all greater than 90).

[0005] The patent publication number is CN108767097A, and the publication date is November 6, 2018. It discloses a UV-excited full-spectrum LED, including a UV LED chip and a mixed phosphor; the mixed phosphor includes a blue phosphor with an emission peak of 445-450nm, a blue-green phosphor with an emission peak of 495-500nm, a yellow-green phosphor with an emission peak of 540-545nm, an orange-red phosphor with an emission peak of 600-605nm, and a dark red phosphor with an emission peak of 640-645nm; based on the mass of the mixed phosphor as 100%, the content of each component is as follows: 30-45% blue phosphor; 30-40% blue-green phosphor; 20-30% yellow-green phosphor; 5-10% orange-red phosphor; 1-5% dark red phosphor.

[0006] The above patents all use ultraviolet chips to excite phosphors to achieve full-spectrum LEDs, but they have the problem of a high proportion of blue light.

[0007] To solve this problem, after searching, the patent publication number is CN109638146A, and the publication date is April 16, 2019. The invention discloses an LED light source based on ultraviolet chip excitation for reducing blue light hazards, including a lead bracket, a ultraviolet chip is arranged at the bottom end of the inner part of the lead bracket, and the inner part of the lead bracket is filled with fluorescent glue, and the fluorescent glue contains blue phosphor, yellow-green phosphor, red phosphor, silicone A glue and silicone B glue, and anti-precipitation powder, wherein the mass proportion of blue phosphor is 20% to 40%, the mass proportion of yellow-green phosphor is 10% to 30%, the mass proportion of red phosphor is 1% to 10%, the mass proportion of silicone A glue is 20% to 30%, the mass proportion of silicone B glue is 20% to 30%, and the mass proportion of anti-precipitation powder is 0.1% to 0.3%, and the total mass proportion of the blue phosphor, yellow-green phosphor, red phosphor, silicone A glue, silicone B glue and anti-precipitation powder is 1. Adding anti-precipitation powder in this solution can easily form light spots, affect the lighting effect, and cause obvious peaks and troughs in the spectrum. Summary of the invention

[0008] 1. Problem to be solved

[0009] In view of the problem that the existing full-spectrum LED spectrum with a small proportion of blue light has obvious peaks and troughs, the present invention provides a full-spectrum LED healthy light source and device. The spectrum of the full-spectrum LED healthy light source has a small proportion of blue light and a smoother curve without obvious peaks and troughs.

[0010] 2. Technical solution

[0011] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0012] A full-spectrum LED healthy light source comprises an excitation source violet light chip and an emission source fluorescent powder, comprising the emission source fluorescent powder and an excitation source violet light chip for exciting the fluorescent powder, wherein the violet light chip is a 410-415 nm chip; the fluorescent powder comprises a blue fluorescent powder with a peak wavelength of 450 nm±1, a cyan fluorescent powder with a peak wavelength of 494 nm±1, a red fluorescent powder with a peak wavelength of 647±1 nm, and a peak wavelength of 534±1 nm, with a mass fraction of 50%-60% of the blue fluorescent powder, 15%-25% of the cyan fluorescent powder, 4%-6% of the red fluorescent powder, and 12-20% of the green fluorescent powder. Among them, the left half-wave width of the chip in the peak wavelength band of 410-415nm can be extended to 380nm, forming a continuous visible spectrum from 380nm; the wavelength of the phosphor can improve the excitation efficiency of the purple light chip, and with different ratios, it can stimulate a stable and continuous spectrum, while improving the R10-R15 parameters to no less than 95, and the color rendering index CIR to greater than 98.

[0013] Further, the ultraviolet chip is a single-piece front-mounted medium-power chip or a single-piece flip-chip medium-power chip.

[0014] Further, the peak wavelength of the blue phosphor is 450 nm, the peak wavelength of the blue-green phosphor is 494 nm, the peak wavelength of the red phosphor is 647 nm, and the peak wavelength of the green phosphor is 534 nm.

[0015] Further, the particle size of the blue phosphor is 20.5 μm ± 1.5 μm, the particle size of the blue-green phosphor is 21.3 μm ± 1.5 μm, the particle size of the red phosphor is 18.8 μm ± 1.5 μm, and the particle size of the green phosphor is 22.6 μm ± 1.5 μm. Using phosphors with a particle size greater than 18 μm can improve the efficiency of exciting the ultraviolet chip to achieve higher luminous efficiency.

[0016] Further, the phosphors include the blue phosphor being rare-earth phosphoaluminate Sr5(PO4)3Cl:Eu, the blue-green phosphor being rare-earth phosphoaluminate Sr5(PO4)3Cl:Eu and (Y 1-x-y Lu x Gdy)3(Al 1-z Ga z )5O 12 :Ce, the red phosphor being silicon-based nitride (Sr 1-x Ca x )AlSiN3:Eu, and the green phosphor being rare-earth phosphoaluminate (Y 1-x-y Lu x Gd y )3(Al 1-z Ga z )5O 12 :Ce, where 0 < x < 0.7, 0 < y < 0.3, 0 < z < 0.4. The silicon-based nitride and rare-earth phosphoaluminate are not easily decomposed by other factors, thus not affecting the stability of the spectrum.

[0017] Further, the mixing method of the phosphors is centrifugal mixing. By adopting the centrifugal precipitation technology, the phosphors are evenly distributed on the surfaces of the bracket and the chip, avoiding the formation of light spots and further improving the luminous efficiency.

[0018] The present invention reasonably matches the RGB three primary colors through the purple light chip and the phosphor, so that the LED light source has a continuous spectrum, which is closer to the solar spectrum. The purple light chip with a wide half-band is used to excite the phosphor, and the half-band width is stable. Compared with the three phosphors (CN109638146A and CN208298858U) and five phosphors (CN108767097A) used in the prior art, the phosphor used in the present invention has a wide half-band, and a blue-green phosphor with a peak wavelength of 494±1nm is added. The maximum response wavelength of the blue-green phosphor is 494±1nm, so that the spectrum curve is smoother, and no obvious peaks and troughs appear. At the same time, 4%-6% of the red phosphor with a peak wavelength of 647±1nm is added to increase the proportion of red light and improve color rendering. Among them, the mass fraction ratio of the phosphor is controlled to be 50%-60% for blue phosphor, 15%-25% for blue-green phosphor, and 12%-20% for red phosphor and green phosphor, so as to reduce the proportion of blue light while retaining more blue phosphor to ensure the color rendering of the light source. At the same time, phosphor with uniform particle size greater than 18μm is selected to improve the efficiency of exciting the purple light chip to achieve higher light efficiency; anti-precipitation powder is not used, and centrifugal precipitation technology is used to make the phosphor evenly distributed on the surface of the bracket and chip to avoid the formation of light spots and further improve the light efficiency.

[0019] Each parameter of the full-spectrum LED healthy light source R10-R15 of the present invention is as high as 95, and the color rendering index CIR is greater than 98, which effectively increases the proportion of red light and reduces the proportion of blue light, thereby reducing the blue light hazard. It complies with the blue light hazard detection standard IEC / TR62778, and the primary light source radiance measurement is no more than RG1. It can be used in teaching lighting, home lighting, supermarket lighting, beauty lamps and other places.

[0020] The present invention also discloses a full-spectrum LED device, including the above-mentioned full-spectrum LED healthy light source, the full-spectrum LED device also includes a bracket, the bracket is a bowl-cup structure with a depression in the middle, and is provided with a base layer and a functional layer, the base layer is a brass hardware, the functional layer is a silver-plated layer, divided into a first functional area and a second functional area, the base layer and the functional layer are combined by injection molding, the purple light chip is vertically fixed in the bowl of the bracket by a silicon-based solid crystal primer, the negative electrode of the purple light chip is connected to the first functional area of ​​the bracket by a bonding wire, and the positive electrode of the purple light chip is connected to the second functional area of ​​the bracket by a bonding wire; the phosphor is filled in the functional layer and the surface of the purple light chip.

[0021] The full-spectrum LED device of the present invention can be used for lighting during the plant growth process, and is also used in fields with high requirements on spectral quality, such as surgical lamps, eye protection lamps, museum lighting, and high-end venue lighting.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention uses a purple light chip with a wide half-wave band to excite the phosphor, the half-wave width is stable, the spectrum curve is smoother, no obvious peaks and troughs appear, and it has a continuous spectrum that is closer to the solar spectrum;

[0025] (2) The present invention uses a purple light chip and phosphor to reasonably match the three primary colors of RGB, effectively reducing the proportion of blue light, thereby reducing the harm of blue light;

[0026] (3) The present invention uses phosphor with large particle size to improve the efficiency of exciting the purple light chip and achieve higher light efficiency;

[0027] (4) The present invention uses centrifugal precipitation technology to evenly distribute the phosphor on the surface of the bracket and the chip to avoid the formation of light spots;

[0028] (5) The full-spectrum LED healthy light source of the present invention has good color rendering, each parameter of R10-R15 is as high as 95, and the color rendering index CIR is greater than 98. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0030] Figure 1 This is a schematic diagram of the structure of the full-spectrum LED healthy light source of the present invention;

[0031] In the figure: 1. bracket; 2. Ziguang chip; 3. negative electrode bonding wire; 4. positive electrode bonding wire; 5. phosphor; 6. first functional area; 7. second functional area. DETAILED DESCRIPTION

[0032] The following detailed description of exemplary embodiments of the present invention refers to the accompanying drawings, which form a part of the description, and in which exemplary embodiments of the present invention that can be implemented are shown as examples. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments can be implemented and various changes can be made to the present invention without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but is only for the purpose of illustrating and not limiting the description of the characteristics and features of the present invention, so as to propose the best mode for performing the present invention and to enable those skilled in the art to implement the present invention. Therefore, the scope of the present invention is limited only by the appended claims.

[0033] The following detailed description of the present invention and example embodiments may be better understood in conjunction with the accompanying drawings, in which elements and features of the present invention are identified by reference numerals.

[0034] The phosphors of the present invention were purchased from Jiangsu Borui Optoelectronics Co., Ltd., and the models were BE01 blue phosphor, BE02 blue-green phosphor, RC04 red phosphor, and GB04 green phosphor.

[0035] Among them, Table 1 shows the phosphor components and contents of the full-spectrum LED healthy light sources of various embodiments of the present invention, and Table 2 shows the performance parameters of the full-spectrum LED healthy light sources of various embodiments of the present invention.

[0036] Table 1 Phosphor components and contents of various embodiments of the present invention

[0037]

[0038] Table 2 Performance parameters of various embodiments of the present invention

[0039]

[0040]

[0041] Each parameter of the full-spectrum LED healthy light source R10-R15 of each embodiment of the present invention is as high as 98, the color rendering index CIR is greater than 98, the proportion of blue light is less than 0.7%, the blue light hazard is less, and it complies with the blue light hazard detection standard IEC / TR 62778.

[0042] The above full-spectrum LED healthy light source is applied to full-spectrum LED devices, such as Figure 1 As shown, the full-spectrum LED device includes a bracket 1, a purple chip 2 and a phosphor 5. The bracket 1 includes a two-layer structure, a brass hardware and a silver-plated functional layer, which are connected by injection molding. The silver-plated functional layer includes a first functional area 6 and a second functional area 7. The purple chip 2 is vertically fixed in the bowl of the bracket 1 by a silicon-based solid crystal primer; the negative electrode of the purple chip 2 is connected to the first functional area 6 of the bracket 1 through a negative electrode bonding wire 3, and the positive electrode of the purple LED chip 2 is connected to the second functional area 7 of the bracket 1 through a positive electrode bonding wire 4; the phosphor 5 is uniformly precipitated on the surface of the functional layer and the purple chip 2 by centrifugal precipitation technology.

Claims

1. A full-spectrum LED healthy light source, comprising an emission source phosphor and an excitation source purple light chip for exciting the phosphor, characterized in that: The Ziguang chip is a 410-415nm chip; The phosphor is as follows by mass fraction: 50%-60% blue phosphor with a peak wavelength of 450±1nm, 15%-25% blue-green phosphor with a peak wavelength of 494±1nm, 4%-6% red phosphor with a peak wavelength of 647±1nm, 12-20% of the green phosphor with a peak wavelength of 534±1nm makes each parameter of the full-spectrum LED healthy light source R10-R15 as high as 95, and the color rendering index CRI is greater than 98.

2. A full-spectrum LED healthy light source according to claim 1, characterized in that: The Ziguang chip is a single upright mid-power chip or a single flip-chip mid-power chip.

3. The full-spectrum LED healthy light source according to claim 1, characterized in that: The peak wavelength of the blue phosphor is 450 nm, the peak wavelength of the cyan phosphor is 494 nm, the peak wavelength of the red phosphor is 647 nm, and the peak wavelength of the green phosphor is 534 nm.

4. The full-spectrum LED healthy light source according to claim 1, characterized in that: The particle size of the blue phosphor is 20.5 μm±1.5 μm, the particle size of the blue-green phosphor is 21.3 μm±1.5 μm, the particle size of the red phosphor is 18.8 μm±1.5 μm, and the particle size of the green phosphor is 22.6 μm±1.5 μm.

5. The full-spectrum LED healthy light source according to claim 1, characterized in that: The phosphors include blue phosphors which are rare earth aluminophosphate, blue-green phosphors which are rare earth aluminophosphate, red phosphors which are silicon-based nitride and green phosphors which are rare earth aluminophosphate.

6. The full-spectrum LED healthy light source according to claim 1, characterized in that: The phosphor powder is mixed in a centrifugal manner.

7. A full-spectrum LED device, comprising the full-spectrum LED healthy light source according to any one of claims 1 to 6, characterized in that: The invention also comprises a support (1), wherein the support (1) is provided with a base layer and a functional layer, wherein the functional layer is a silver-plated layer and is divided into a first functional area (6) and a second functional area (7), wherein the purple light chip (2) is arranged on the support (1), wherein the phosphor (5) is filled in the functional layer and the surface of the purple light chip (2), wherein the negative electrode of the purple light chip (2) is connected to the first functional area (6) of the support (1) via a negative electrode bonding wire (3), and the positive electrode of the purple light chip (2) is connected to the second functional area (7) via a positive electrode bonding wire (4).

8. A full spectrum LED device according to claim 7, characterized in that: The support (1) is a bowl-cup structure with a depression in the middle.

9. A full-spectrum LED device according to claim 8, characterized in that: The Ziguang chip (2) is vertically fixed in the bowl of the bracket (1) by means of a silicon-based die-bonding adhesive.

10. A full spectrum LED device according to claim 9, characterized in that: The base layer is a brass hardware, and the base layer and the functional layer are combined by injection molding.

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