Light-emitting diode (LED) light source simulating dawn light, preparation method thereof and LED lamp

Abstract

The invention discloses an LED light source simulating dawn light, a preparation method of the LED light source and an LED lamp. The LED light source simulating dawn light comprises an LED chip and a fluorescent adhesive film. The fluorescent glue film comprises packaging glue and mixed fluorescent powder, and the mixed fluorescent powder comprises blue fluorescent powder with the emission peak value ranging from 440 nm to 450 nm, yellow-green fluorescent powder with the emission peak value ranging from 520 nm to 530 nm, red fluorescent powder with the emission peak value ranging from 620 nm to 660 nm and near-infrared fluorescent powder with the emission peak value ranging from 740 nm to 860 nm. The LED chip comprises a blue light LED chip with the emission peak value of 450 nm to 470 nm and a purple light LED chip with the emission peak value of 400 nm to 420 nm. The spectrum of the light source provided by the invention is highly matched with the dawn spectrum, and meanwhile, the ultraviolet exceeding part in the sunlight can be inhibited, so that the human body is dawn, and the obvious effects of inhibiting melanin and improving the weight of the human body are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of LED light sources, and in particular to an LED light source for simulating dawn light, a preparation method thereof, and an LED lamp. Background Art

[0002] Studies have shown that getting up early and basking in the sun can promote human health. The earlier you get up and bask in the sun, the lower your body mass index, and vice versa. However, in modern society, people's pace of life is fast, and they basically have no time to bask in the dawn. Therefore, it is proposed to simulate sunlight through LED. Currently available LED light sources generally couple yellow-green phosphors and red phosphors through a 450nm wavelength blue LED chip to obtain a white light source and spectrum based on a three-primary color scheme. However, it can only achieve basic lighting. The spectrum of the light source obtained is less similar to the sunlight spectrum, and the relative intensity and spectral configuration of the sunlight spectrum at different times of the day are different. Therefore, it is even more difficult for conventional white LED light sources to simulate dawn. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an LED light source for simulating dawn, a preparation method thereof, and an LED lamp. The spectrum of the light source is highly consistent with the spectrum of dawn, and at the same time, the ultraviolet rays in the sunlight that exceed the standard can be suppressed, so that the human body is bathed in the dawn, which has a significant effect on inhibiting melanin and improving body weight.

[0004] In order to solve the above problems, the present invention discloses an LED light source for simulating dawn, comprising an LED chip and a fluorescent film;

[0005] The fluorescent adhesive film includes packaging adhesive and mixed fluorescent powder, and the mixed fluorescent powder includes blue fluorescent powder with an emission peak of 440nm to 450nm, yellow-green fluorescent powder with an emission peak of 520nm to 530nm, red fluorescent powder with an emission peak of 620nm to 660nm, and near-infrared fluorescent powder with an emission peak of 740nm to 860nm;

[0006] The LED chips include a blue LED chip with an emission peak of 450nm to 470nm and a purple LED chip with an emission peak of 400nm to 420nm.

[0007] As an improvement of the above technical solution, the mass ratio of the encapsulation glue and the mixed phosphor is (0.2-0.6):1;

[0008] Taking the mass of the mixed phosphor as 100%, the content of each component is as follows: 15% to 25% of blue phosphor with an emission peak of 440nm to 450nm; 18% to 30% of yellow-green phosphor with an emission peak of 520nm to 530nm; 15% to 25% of red phosphor with an emission peak of 620nm to 660nm; and 20% to 40% of near-infrared phosphor with an emission peak of 740nm to 860nm.

[0009] As an improvement of the above technical solution, based on the mass of the mixed phosphor being 100%, the content of each component is as follows: 15% to 25% of blue phosphor with an emission peak of 440nm to 450nm; 18% to 30% of yellow-green phosphor with an emission peak of 520nm to 530nm; 7.5% to 12.5% ​​of red phosphor with an emission peak of 620nm to 630nm; 7.5% to 12.5% ​​of red phosphor with an emission peak of 640nm to 660nm; 10% to 20% of near-infrared phosphor with an emission peak of 740nm to 760nm; and 10% to 20% of near-infrared phosphor with an emission peak of 840nm to 860nm.

[0010] As an improvement of the above technical solution, based on the mass of the mixed phosphor being 100%, the content of each component is as follows: 15% to 20% of blue phosphor with an emission peak of 450nm; 20% to 30% of yellow-green phosphor with an emission peak of 527nm; 10% to 15% of red phosphor with an emission peak of 627nm; 10% to 15% of red phosphor with an emission peak of 650nm; 14% to 19% of near-infrared phosphor with an emission peak of 750nm; and 14% to 19% of near-infrared phosphor with an emission peak of 850nm.

[0011] As an improvement of the above technical solution, the LED chips include a purple LED chip with an emission peak of 400nm to 420nm, a blue LED chip with an emission peak of 450nm to 455nm, and a blue LED chip with an emission peak of 465nm to 470nm.

[0012] As an improvement of the above technical solution, the blue phosphor is BaMgAl 10 O 17 :Eu 2+ , CaF 2 :Eu 2+ , CaAl 2 O 4 :Eu 2+ One or more of;

[0013] The yellow-green phosphor is Y 3 GaAlO 12 :Ce 3+、β-SiAlON:Eu 2+ , Tb 3 Al 5 O 12 :Ce 3+ One or more of;

[0014] The red phosphor is CaAlSiN 3 :Eu 2+ , Sr 2 Si 5 N 8 :Eu 2+ , Y 2 Mg 0.8 Sr 0.2 Al 4 SiO 12 :Eu 2+ One or more of;

[0015] The near-infrared phosphor is BaMgGaAl 10 O 17 :Cr 3+ , Ca 3 Sc 2 Si 3 O 12 :Cr 3+ Sc 4 Zr 3 O 12 :Cr 3+ One or more of .

[0016] As an improvement of the above technical solution, the packaging glue is one or more of silicone packaging glue, epoxy resin packaging glue, polymethyl methacrylate packaging glue, and polycarbonate packaging glue.

[0017] As an improvement of the above technical solution, the encapsulation glue includes the following raw materials in parts by weight: 50 to 100 parts of vinyl silicone oil, 5 to 30 parts of methyl vinyl MQ silicone resin, 5 to 20 parts of methyl phenyl hydrogenated silicone oil, 2 to 10 parts of fumed silica, 0.5 to 1 part of catalyst, and 0.5 to 1 part of inhibitor.

[0018] Correspondingly, the present invention also discloses a method for preparing the above-mentioned LED light source for simulating dawn, comprising the following steps:

[0019] Fixing the blue LED chip and the purple LED chip on the packaging bracket;

[0020] Connecting the blue LED chip and the purple LED chip to the packaging bracket respectively;

[0021] The encapsulation glue and the mixed phosphor powder are mixed and stirred in a certain proportion to obtain the fluorescent glue;

[0022] Applying fluorescent glue to form a fluorescent glue film covering the blue LED chip and the purple LED chip;

[0023] Curing the fluorescent adhesive film to obtain an LED light-emitting unit;

[0024] Divide the LED light-emitting unit by BIN.

[0025] Correspondingly, the present invention also discloses an LED lamp, which adopts the above-mentioned LED light source for simulating dawn.

[0026] The implementation of the present invention has the following beneficial effects:

[0027] In the LED light source simulating dawn provided by the present invention, the purple LED chip matches the blue phosphor, which can absorb the purple light intensity while providing purple light energy, so as to avoid the excessive purple light energy causing harm to human skin; in addition, the spectrum is supplemented by the blue LED chip, so as to improve the fitting degree between the LED light source and the dawn spectrum; the visual effect is improved and the eye fatigue is reduced by the combination of the yellow-green phosphor, the red phosphor and the near-infrared phosphor. The present invention uses the LED light source simulating dawn to allow people to bathe in the morning light indoors, adjust the biological clock, inhibit the generation of melanin in human skin, and even achieve the effect of weight loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a comparison chart of white light spectrum and sunlight spectrum in the prior art;

[0029] Figure 2 is a schematic diagram of the packaging structure of an LED light source provided by an embodiment of the present invention;

[0030] Figure 3 It is a BIN diagram of the LED light-emitting unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in further detail below.

[0032] The present invention provides an LED light source for simulating dawn, comprising an LED chip and a fluorescent film;

[0033] The fluorescent adhesive film includes packaging adhesive and mixed fluorescent powder, and the mixed fluorescent powder includes blue fluorescent powder with an emission peak of 440nm to 450nm, yellow-green fluorescent powder with an emission peak of 520nm to 530nm, red fluorescent powder with an emission peak of 620nm to 660nm, and near-infrared fluorescent powder with an emission peak of 740nm to 860nm;

[0034] The LED chips include a blue LED chip with an emission peak of 450nm to 470nm and a purple LED chip with an emission peak of 400nm to 420nm.

[0035] In the existing LED packaging technology, a 450nm wavelength blue light chip is usually used to couple yellow-green phosphor and red phosphor to obtain a conventional white light source and spectrum, but it can only achieve basic lighting and has limited performance. Figure 1 It can be seen that the similarity between the conventional white light spectrum and the sunlight spectrum is low, and the relative intensity and spectral configuration of the sunlight spectrum at different times of the day are different. Generally speaking, dawn can be roughly defined as the period from about 1 hour before sunrise to about 1 hour after sunrise. The human body is bathed in dawn, which has a significant effect on inhibiting melanin and improving weight. The present invention realizes the simulation of dawn through the coupling of blue light chip, purple light chip and mixed phosphor, inhibits the ultraviolet part of sunlight that exceeds the standard, reduces the damage caused by ultraviolet rays to the skin, and reduces the production of melanin in the human body. By simulating dawn, people can bathe in the morning light indoors, adjust the biological clock, inhibit the production of melanin in the human skin, and even achieve a weight loss effect.

[0036] In a preferred embodiment, the mass ratio of the encapsulating glue to the mixed phosphor is (0.2-0.6):1, exemplarily 0.25:1, 0.3:1, 0.4:1, 0.5:1 or 0.55:1, but not limited thereto. Taking the mass of the mixed phosphor as 100%, the content of each component is as follows: 15%-25% of blue phosphor with an emission peak of 440nm-450nm; 18%-30% of yellow-green phosphor with an emission peak of 520nm-530nm; 15%-25% of red phosphor with an emission peak of 620nm-660nm; 20%-40% of near-infrared phosphor with an emission peak of 740nm-860nm.

[0037] Specifically, in one embodiment, the mixed phosphor includes a blue phosphor with an emission peak of 440nm to 450nm, a yellow-green phosphor with an emission peak of 520nm to 530nm, a red phosphor with an emission peak of 620nm to 630nm, a red phosphor with an emission peak of 640nm to 660nm, a near-infrared phosphor with an emission peak of 740nm to 760nm, and a near-infrared phosphor with an emission peak of 840nm to 860nm. Blue phosphor with an emission peak of 440nm~450nm is used to absorb the intensity of purple light. Yellow-green phosphor with an emission peak of 520nm~530nm, red phosphor with an emission peak of 620nm~630nm, and red phosphor with an emission peak of 640nm~660nm are used to couple with the blue light chip to form white light. The addition of near-infrared phosphor with an emission peak of 740nm~760nm and near-infrared phosphor with an emission peak of 840nm~860nm can provide a certain amount of infrared irradiation, promote blood circulation, accelerate human metabolism, and enhance visual effects and reduce eyestrain through the combination of phosphors of different colors.

[0038] More preferably, the mixed phosphor includes 15% to 20% of blue phosphor with an emission peak of 450nm; 20% to 30% of yellow-green phosphor with an emission peak of 527nm; 10% to 15% of red phosphor with an emission peak of 627nm; 10% to 15% of red phosphor with an emission peak of 650nm; 14% to 19% of near-infrared phosphor with an emission peak of 750nm; and 14% to 19% of near-infrared phosphor with an emission peak of 850nm. By using the various phosphors of the present invention in combination with blue LED chips and purple LED chips, an LED spectrum that is highly consistent with the dawn spectrum can be obtained, and the spectral similarity can reach more than 95%.

[0039] Specifically, the blue phosphor may be aluminate, the yellow-green phosphor may be GaYAG aluminate, the red phosphor may be nitride, and the near-infrared phosphor may be aluminate. Optionally, the blue phosphor may be BaMgAl 10 O 17 :Eu 2+ , CaF 2 :Eu 2+ , CaAl 2 O 4 :Eu 2+ One or more of; the yellow-green phosphor is Y 3 GaAlO 12 :Ce 3+ 、β-SiAlON:Eu 2+ , Tb 3 Al 5 O 12 :Ce3+ One or more of; the red phosphor is CaAlSiN 3 :Eu 2+ , Sr 2 Si 5 N 8 :Eu 2+ , Y 2 Mg 0.8 Sr 0.2 Al 4 SiO 12 :Eu 2+ One or more of the following; the near-infrared phosphor is BaMgGaAl 10 O 17 :Cr 3+ , Ca 3 Sc 2 Si 3 O 12 :Cr 3+ Sc 4 Zr 3 O 12 :Cr 3+ One or more of .

[0040] In a preferred embodiment, the LED chips include a violet LED chip with an emission peak of 410nm to 415nm, a blue LED chip with an emission peak of 450nm to 455nm, and a blue LED chip with an emission peak of 465nm to 470nm.

[0041] Among them, the 410nm~415nm purple LED chip is used to enhance the light source of the 410nm~440nm wavelength in the LED light source simulating dawn, ensuring that there is no lack of purple light energy in the light source, and at the same time matching the blue phosphor to absorb the purple light intensity to avoid excessive purple light energy causing harm to human skin. The 450nm~455nm blue LED chip and the 465nm~470nm blue LED chip can make up the spectrum and improve the fit between the spectrum and dawn. In addition, through the combination of yellow-green phosphor with an emission peak of 527nm, red phosphor with an emission peak of 627nm, red phosphor with an emission peak of 650nm, near-infrared phosphor with an emission peak of 750nm and near-infrared phosphor with an emission peak of 850nm, it matches the 500nm~900nm band of dawn, improves visual effects and reduces eye fatigue.

[0042] Optionally, the encapsulant is one or more of silicone encapsulant, epoxy resin encapsulant, polymethyl methacrylate encapsulant, and polycarbonate encapsulant. Encapsulant generally has properties such as high refractive index, high transmittance, resistance to ultraviolet radiation, and resistance to high and low temperatures, seals and protects the LED chip, prevents it from being affected by air temperature and humidity, and improves the reliability of the device; encapsulant can also dissipate heat to prevent the LED chip from being in a high temperature environment for a long time; in addition, encapsulant can also reduce the refractive index difference between the LED chip and the air, improve light extraction efficiency, and optimize light path distribution. In one embodiment, the encapsulant can be AB epoxy encapsulant, the viscosity of A glue is 8300mPa·s, the viscosity of B glue is 1000mPa·s, the ratio of AB glue mixing is 1:(8~15), and the viscosity of AB epoxy encapsulant after mixing is 1200mPa·s, and the refractive index is 1.54. However, since the fluorescent adhesive film of the present invention includes a variety of different phosphors, the dispersion uniformity of the various phosphors in the encapsulant needs to be further improved. Moreover, the stability of phosphors has a great impact on the service life and application range of LED devices. Poor stability of phosphors will lead to a shortened service life of LED devices.

[0043] In a preferred embodiment, the encapsulation adhesive comprises the following raw materials in parts by weight: 50 to 100 parts of vinyl silicone oil, 5 to 30 parts of methyl vinyl MQ silicone resin, 5 to 20 parts of methyl phenyl hydrogenated silicone oil, 2 to 10 parts of fumed silica, 0.5 to 1 part of catalyst, and 0.5 to 1 part of inhibitor. Vinyl silicone oil and methyl vinyl MQ silicone resin are used as base polymers, which are cross-linked under the action of methyl phenyl hydrogenated silicone oil. The addition of fumed silica prevents the sedimentation of a mixture of multiple phosphors. The encapsulation adhesive provided by the present invention can improve the uniformity of the distribution of phosphors in the encapsulation adhesive while improving the overall mechanical properties of the phosphor adhesive.

[0044] Among them, the M / Q ratio of the methyl vinyl MQ silicone resin is 0.5-0.7, and the vinyl content is 6%-8%; the catalyst can be a platinum catalyst with a platinum content of 0.2%-0.4%; the inhibitor can be one or more of 1-ethynyl cyclohexanol, 3-methyl-1-butyn-3-ol, and 3-phenyl-1-butyn-3-ol.

[0045] Specifically, the method for preparing the packaging glue comprises the following steps:

[0046] Vinyl silicone oil, methyl vinyl MQ silicone resin and methyl phenyl hydrogen silicone oil are mixed according to a preset ratio, and a catalyst, an inhibitor and fumed silica are added, and the mixture is stirred and mixed evenly to obtain the product.

[0047] In addition, the present invention also provides a method for preparing the above-mentioned LED light source for simulating dawn light, comprising the following steps:

[0048] S1, fixing the blue LED chip and the purple LED chip on the packaging bracket;

[0049] In one embodiment, Figure 2 As shown, a purple LED chip 21 with an emission peak of 410nm to 415nm, a blue LED chip 22 with an emission peak of 450nm to 455nm, and a blue LED chip 23 with an emission peak of 465nm to 470nm are fixed on the packaging bracket 1 in sequence.

[0050] S2, respectively connecting the blue LED chip and the purple LED chip to the packaging bracket;

[0051] In one embodiment, Figure 2 As shown, a purple LED chip 21 with an emission peak of 410nm to 415nm, a blue LED chip 22 with an emission peak of 450nm to 455nm, and a blue LED chip 23 with an emission peak of 465nm to 470nm are respectively connected to the packaging bracket 1 using gold wires.

[0052] S3, mixing the encapsulation glue and the mixed phosphor powder in a certain proportion to obtain a fluorescent glue;

[0053] In one embodiment, the fluorescent glue includes packaging glue and mixed fluorescent powder, and the mass ratio of the packaging glue to the mixed fluorescent powder is (0.2-0.6):1.

[0054] In a preferred embodiment, based on the mass of the mixed phosphor being 100%, the content of each component is as follows: 15% to 20% of blue phosphor with an emission peak of 450nm; 20% to 30% of yellow-green phosphor with an emission peak of 527nm; 10% to 15% of red phosphor with an emission peak of 627nm; 10% to 15% of red phosphor with an emission peak of 650nm; 14% to 19% of near-infrared phosphor with an emission peak of 750nm; and 14% to 19% of near-infrared phosphor with an emission peak of 850nm.

[0055] S4, applying fluorescent glue to form a fluorescent glue film covering the blue LED chip and the purple LED chip;

[0056] S5, curing the fluorescent film to obtain an LED light-emitting unit;

[0057] In one embodiment, the curing is carried out at 80° C. to 100° C. for 1 h to 1.5 h, and then at 150° C. to 180° C. for 3 h to 5 h. Preferably, the curing is carried out at 100° C. for 1 h, and then at 150° C. for 3 h.

[0058] S6. Divide the LED light-emitting unit by BIN.

[0059] In one embodiment, Figure 3 BIN division is performed according to the BIN division diagram shown.

[0060] In addition, the present invention also provides an LED lamp, which adopts the above-mentioned LED light source for simulating dawn.

[0061] The present invention will be further described below with specific embodiments:

[0062] Example 1

[0063] This embodiment provides an LED light source for simulating dawn light, including an LED chip and a fluorescent film.

[0064] The fluorescent adhesive film includes packaging adhesive and mixed fluorescent powder, and the mass ratio of the packaging adhesive to the mixed fluorescent powder is 0.4:1.

[0065] The mixed phosphor includes blue phosphor with an emission peak of 450nm, yellow-green phosphor with an emission peak of 527nm, red phosphor with an emission peak of 650nm, and near-infrared phosphor with an emission peak of 750nm. Taking the mass of the mixed phosphor as 100%, the content of each component is as follows: 15% of blue phosphor with an emission peak of 450nm; 30% of yellow-green phosphor with an emission peak of 527nm; 20% of red phosphor with an emission peak of 650nm; and 35% of near-infrared phosphor with an emission peak of 750nm.

[0066] The LED chips include a blue light LED chip with an emission peak of 450nm to 470nm and a purple light LED chip with an emission peak of 410nm to 415nm.

[0067] Example 2

[0068] This embodiment provides an LED light source for simulating dawn light, which differs from Embodiment 1 in that the LED chips include a blue light LED chip with an emission peak of 450nm to 455nm, a blue light LED chip with an emission peak of 465nm to 470nm, and a purple light LED chip with an emission peak of 410nm to 415nm.

[0069] The rest are the same as in Example 1.

[0070] Example 3

[0071] The present embodiment provides an LED light source for simulating dawn, which differs from Embodiment 2 in that the mixed phosphor comprises a blue phosphor with an emission peak of 450nm, a yellow-green phosphor with an emission peak of 527nm, a red phosphor with an emission peak of 627nm, a red phosphor with an emission peak of 650nm, a near-infrared phosphor with an emission peak of 750nm, and a near-infrared phosphor with an emission peak of 850nm. Taking the mass of the mixed phosphor as 100%, the content of each component is as follows: 19.03% of the blue phosphor with an emission peak of 450nm; 26% of the yellow-green phosphor with an emission peak of 527nm; 10.71% of the red phosphor with an emission peak of 627nm; 10.7% of the red phosphor with an emission peak of 650nm; 16.78% of the near-infrared phosphor with an emission peak of 750nm; and 16.78% of the near-infrared phosphor with an emission peak of 850nm.

[0072] The rest is the same as Example 2.

[0073] Example 4

[0074] This embodiment provides an LED light source for simulating dawn, which differs from Embodiment 3 in that the encapsulation adhesive comprises the following raw materials in parts by mass: 80 parts of vinyl silicone oil, 25 parts of methyl vinyl MQ silicone resin, 10 parts of methylphenyl hydrogenated silicone oil, 6 parts of fumed silica, 0.8 parts of catalyst, and 0.6 parts of inhibitor.

[0075] The rest is the same as Example 3.

[0076] Performance testing:

[0077] (1) M / P: The M / P of Examples 1 to 4 was calculated according to the following formula. Under a fixed photopic illumination intensity, M / P (ratio of melanin equivalent illumination to photopic illumination) has a significant positive correlation with the perception of spatial brightness. M / P (at a color temperature of 2000K) is used as a parameter to evaluate whether the lighting spectrum can effectively provide spatial brightness perception.

[0078]

[0079] Where W melanopic is the spectral light energy function of melanopsin; W photopic W is the photopic spectral luminous energy function; λ is the spectral energy distribution; A is the maximum spectral luminous efficacy of photopic vision.

[0080] (2) Spectral similarity (SDS): The similarity between Examples 1 to 4 and the Shuguang spectrum was calculated according to the following formula.

[0081]

[0082] In the formula, S(λ) LED The spectrum of the LED light source simulating dawn provided in Examples 1 to 4 of the present invention, S(λ) Ref The dawn spectrum.

[0083] M / P SDS Example 1 0.26±0.03 95.1％ Example 2 0.29±0.03 95.5％ Example 3 0.31±0.03 96.2％ Example 4 0.34±0.03 96.8％

[0084] The above is a preferred embodiment of the invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the invention. These improvements and modifications are also considered to be within the scope of protection of the invention.

Claims

1. An LED light source for simulating dawn, characterized in that: Including LED chips and fluorescent films; The fluorescent adhesive film includes packaging adhesive and mixed fluorescent powder, and the mixed fluorescent powder includes blue fluorescent powder with an emission peak of 440nm to 450nm, yellow-green fluorescent powder with an emission peak of 520nm to 530nm, red fluorescent powder with an emission peak of 620nm to 660nm, and near-infrared fluorescent powder with an emission peak of 740nm to 860nm; The LED chips include a blue light LED chip with an emission peak of 450nm to 470nm and a purple light LED chip with an emission peak of 400nm to 420nm.

2. The LED light source for simulating dawn light according to claim 1, characterized in that: The mass ratio of the packaging glue and the mixed phosphor is (0.2-0.6):1; Taking the mass of the mixed phosphor as 100%, the content of each component is as follows: 15% to 25% of blue phosphor with an emission peak of 440nm to 450nm; 18% to 30% of yellow-green phosphor with an emission peak of 520nm to 530nm; 15% to 25% of red phosphor with an emission peak of 620nm to 660nm; and 20% to 40% of near-infrared phosphor with an emission peak of 740nm to 860nm.

3. The LED light source for simulating dawn light according to claim 2, characterized in that: Taking the mass of the mixed phosphor as 100%, the content of each component is as follows: 15% to 25% of blue phosphor with an emission peak of 440nm to 450nm; 18% to 30% of yellow-green phosphor with an emission peak of 520nm to 530nm; 7.5% to 12.5% ​​of red phosphor with an emission peak of 620nm to 630nm; 7.5% to 12.5% ​​of red phosphor with an emission peak of 640nm to 660nm; 10% to 20% of near-infrared phosphor with an emission peak of 740nm to 760nm; and 10% to 20% of near-infrared phosphor with an emission peak of 840nm to 860nm.

4. The LED light source for simulating dawn light as claimed in claim 3, characterized in that: Taking the mass of the mixed phosphor as 100%, the content of each component is as follows: 15% to 20% of blue phosphor with an emission peak of 450nm; 20% to 30% of yellow-green phosphor with an emission peak of 527nm; 10% to 15% of red phosphor with an emission peak of 627nm; 10% to 15% of red phosphor with an emission peak of 650nm; 14% to 19% of near-infrared phosphor with an emission peak of 750nm; and 14% to 19% of near-infrared phosphor with an emission peak of 850nm.

5. The LED light source for simulating dawn light according to claim 1, characterized in that: The LED chips include a purple LED chip with an emission peak of 400nm to 420nm, a blue LED chip with an emission peak of 450nm to 455nm, and a blue LED chip with an emission peak of 465nm to 470nm.

6. The LED light source for simulating dawn light according to claim 1, characterized in that: The blue phosphor is BaMgAl 10 O 17 :Eu 2+ 、CaF2:Eu 2+ 、CaAl2O4:Eu 2+ One or more of; The yellow-green phosphor is Y3GaAlO 12 :Ce 3+ 、β-SiAlON:Eu 2+ 、Tb3Al5O 12 :Ce 3+ One or more of; The red phosphor is CaAlSiN3:Eu 2+ 、Sr2Si5N8:Eu 2+ 、Y2Mg 0.8 Sr 0.2 Al4SiO 12 :Eu 2+ One or more of; The near-infrared phosphor is BaMgGaAl 10 O 17 :Cr 3+ 、Ca3Sc2Si3O 12 :Cr 3+ Sc4Zr3O 12 :Cr 3+ One or more of .

7. The LED light source for simulating dawn light according to claim 1, characterized in that: The packaging glue is one or more of organic silicon packaging glue, epoxy resin packaging glue, polymethyl methacrylate packaging glue, and polycarbonate packaging glue.

8. The LED light source for simulating dawn light according to claim 1, characterized in that: The packaging glue comprises the following raw materials in parts by weight: 50 to 100 parts of vinyl silicone oil, 5 to 30 parts of methyl vinyl MQ silicone resin, 5 to 20 parts of methyl phenyl hydrogenated silicone oil, 2 to 10 parts of fumed silica, 0.5 to 1 part of catalyst, and 0.5 to 1 part of inhibitor.

9. A method for preparing a LED light source for simulating dawn light according to any one of claims 1 to 8, characterized in that: The following steps are involved: Fixing the blue LED chip and the purple LED chip on the packaging bracket; Connecting the blue LED chip and the purple LED chip to the packaging bracket respectively; The encapsulation glue and the mixed phosphor powder are mixed and stirred in a certain proportion to obtain the fluorescent glue; Applying fluorescent glue to form a fluorescent glue film covering the blue LED chip and the purple LED chip; Curing the fluorescent adhesive film to obtain an LED light-emitting unit; Divide the LED light-emitting unit by BIN.

10. An LED lamp, characterized in that: The LED lamp adopts the LED light source for simulating dawn as claimed in any one of claims 1 to 8.

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