LED light source for human rhythm illumination and LED light-emitting component and light-emitting device thereof

Abstract

The invention relates to an LED light source for human rhythm illumination, an LED light-emitting component of the LED light source and a light-emitting device of the LED light source, and belongs to the technical field of LED light sources. An LED light source for human rhythm illumination comprises an LED chip, and a fluorescent layer covers the light emitting face of the LED chip. The fluorescent layer comprises the following components in parts by weight: 50-70 parts of silica gel and 5-50 parts of blue fluorescent powder; the blue fluorescent powder comprises one or more kinds of blue fluorescent powder with the emission wavelength of 450-500 nm; the LED chip comprises a purple light chip with the emission wavelength of 380-420 nm or a blue light chip with the emission wavelength of 420-460 nm. The LED light source provided by the invention is high in brightness and good in rhythm effect, and can effectively inhibit the formation of melatonin.

Description

Technical Field

[0001] The present application relates to the technical field of LED light sources, and in particular to an LED light source for human rhythmic lighting and an LED light-emitting component and a light-emitting device thereof. Background Art

[0002] With the continuous advancement and widespread application of LED (Light Emitting Diode) technology, the lighting industry has undergone revolutionary changes. Traditional lighting sources, such as incandescent bulbs and fluorescent tubes, are gradually being replaced by LED light sources. This change is mainly due to the continuous maturity of LED devices and the gradual decline in prices, making LED light sources more price competitive, and have longer life, lower energy consumption and higher light efficiency.

[0003] However, with the widespread application of LED light sources, people are beginning to pay attention to the impact of lighting quality and light environment on human health and quality of life. Although traditional light sources can provide basic lighting functions, their spectral characteristics often cannot meet the human body's biological rhythm and visual needs. This has prompted the LED industry to focus not only on light efficiency and cost-effectiveness, but also on improving lighting effects and light quality.

[0004] The LED industry is gradually moving towards a people-oriented lighting era, focusing on circadian lighting. Circadian lighting is a lighting method that adjusts light according to the human body's biological clock and physiological needs. It takes into account the different needs of the human body for light at different time periods, so it can effectively inhibit the formation of melatonin and increase the body's alertness and excitement.

[0005] However, to achieve human-caused rhythmic lighting, a more intelligent and precise LED light source is needed, which can provide the appropriate spectrum and brightness according to the needs of different time periods. The traditional rhythmic LED light source uses a 480nm blue light chip, which to some extent meets the needs of human-caused rhythmic lighting. However, because the blue light of the chip is an extremely strong narrow-wave blue light, such a blue light spectrum cannot cover the non-visual effect spectrum of the human body, and its rhythmic effect still needs to be improved. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the embodiments of the present application includes providing an LED light source for human rhythmic lighting and its LED light-emitting components and light-emitting devices, so as to improve the technical problems that traditional LED light sources have poor rhythmic effects and cannot effectively inhibit the formation of melatonin.

[0007] In the first aspect, the embodiments of the present application provide an LED light source for human rhythmic lighting, including an LED chip, the light-emitting surface of the LED chip is covered with a fluorescent layer; the fluorescent layer includes the following components in parts by weight: 50-70 parts of silica gel, 5-50 parts of blue phosphor; the blue phosphor includes one or more blue phosphors with an emission wavelength of 450-500nm; the LED chip includes a purple light chip with an emission wavelength of 380-420nm or a blue light chip with an emission wavelength of 420-460nm.

[0008] The present application combines the emission of the LED chip with the emission of the phosphor by covering the light-emitting surface of the LED chip with a fluorescent layer, thereby enhancing the brightness and light efficiency of the light source and providing a higher light output efficiency; it can also effectively inhibit the synthesis of melatonin, regulate human biological rhythms, and improve sleep quality. Among them, the fluorescent layer is composed of 50-70 parts of silica gel and 5-50 parts of blue phosphor; silica gel is used as a matrix material to provide good optical properties and durability, while the blue phosphor can emit 450-500nm light waves, enhancing the spectral coverage area of ​​the light source; the purple light (380-420nm) and blue light (420-460nm) wavelengths emitted by the LED chip interact with the blue phosphor to form a composite spectrum. The combination of purple light and blue light can stimulate the photoreceptors in the retina and regulate biological rhythms. The components of silica gel and blue phosphor work synergistically, allowing the light source to adjust the spectrum in different application scenarios (such as work and study). For example, in an environment that requires concentration, the strong stimulation of blue light can improve attention.

[0009] In some embodiments of the present application, the blue phosphor includes a first blue phosphor having an emission wavelength of 450-475 nm and a second blue phosphor having an emission wavelength of 475-500 nm.

[0010] By using a combination of a first blue phosphor with an emission wavelength of 450-475 nm and a second blue phosphor with an emission wavelength of 475-500 nm, not only can a wider spectrum coverage be achieved, but also the overall luminous efficiency of the light source can be improved.

[0011] In some embodiments of the present application, in the blue phosphor, the mass percentage of the first blue phosphor is 5-15%, and the mass percentage of the second blue phosphor is 25-35%.

[0012] The mass percentage design of the first blue phosphor and the second blue phosphor (5-15% and 25-35%) not only increases the blue light output and spectrum optimization, but also improves the luminous efficiency.

[0013] In some embodiments of the present application, the blue phosphor includes a first blue phosphor having an emission wavelength of 450-465 nm, a second blue phosphor having an emission wavelength of 465-480 nm, and a third blue phosphor having an emission wavelength of 480-500 nm.

[0014] The combination of three blue phosphors with emission wavelengths of 450-465nm, 465-480nm and 480-500nm not only achieves wide spectrum coverage and optimized biorhythm regulation, but also improves light source efficiency and enhances adaptability.

[0015] In some embodiments of the present application, in the blue phosphor, the mass percentage of the first blue phosphor is 35-50%, the mass percentage of the second blue phosphor is 30-40%, and the mass percentage of the third blue phosphor is 15-25%.

[0016] The mass percentage designs of the first blue phosphor, the second blue phosphor and the third blue phosphor (35-50%, 30-40% and 15-25%) not only enhance the blue light output and balance the spectrum distribution, but also improve the luminous efficiency.

[0017] In some embodiments of the present application, the LED chip is a purple light chip emitting light at a wavelength of 400-405 nm.

[0018] Using a purple light chip with an emission wavelength of 400-405nm can not only effectively activate retinal photoreceptors and promote melatonin suppression, but also enhance the luminous efficiency of the light source.

[0019] In some embodiments of the present application, the blue phosphor includes BaSi2O2N2:Eu or (Sr,Ba)5(PO4)3Cl:Eu.

[0020] Both BaSi2O2N2:Eu and (Sr,Ba)5(PO4)3Cl:Eu have high luminous efficiency. These two phosphors are doped with the rare earth element europium (Eu) to effectively convert excitation light (such as purple light or blue light) into visible light. The excitation and emission process of europium ions in the phosphor has a high quantum efficiency, resulting in a strong blue light output. The chemical structure of BaSi2O2N2 and (Sr,Ba)5(PO4)3Cl provides good thermal stability, ensuring that the phosphor is not easily degraded under long-term lighting conditions, thereby maintaining the long-term performance and reliability of the light source. Therefore, choosing BaSi2O2N2:Eu and (Sr,Ba)5(PO4)3Cl:Eu as blue phosphors can not only provide high luminous efficiency and thermal stability, but also have wide spectrum emission characteristics and good optical properties.

[0021] In a second aspect, an embodiment of the present application provides an LED light-emitting component, which includes a substrate and any of the above-mentioned LED light sources for human rhythmic lighting.

[0022] In a third aspect, an embodiment of the present application provides a light-emitting device, which includes a packaging component and any of the above-mentioned LED light sources for human rhythmic lighting or the above-mentioned LED light-emitting components, and the packaging component is used to wrap, protect and support the LED light source for human rhythmic lighting or the LED light-emitting component.

[0023] In some embodiments of the present application, the packaging component includes one or more of SMD lamp beads, COB LEDs, LED modules, LED filament lamps and LED light strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the SMD LED lamp bead of the embodiment of the present application;

[0026] Figure 2 This is a spectrum diagram when the LED light source in Example 6 of the present application uses a blue phosphor;

[0027] Figure 3 This is a spectrum diagram when the LED light source in Example 4 of the present application uses two blue phosphors;

[0028] Figure 4 This is a comparison diagram of the LED spectrum and the melatonin sensitive spectrum in Example 4 of the present application;

[0029] Icon: 100-LED chip; 200-chip electrode; 300-LED bracket. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0031] Melatonin is a hormone in the human body, also known as the "sleep hormone", which plays an important role in our biological clock and sleep cycle. The secretion of melatonin is affected by light, especially light of a specific wavelength. In nature, daytime light, especially when there is a blue sky, contains a large amount of blue light bands (440-490nm), and this band of the spectrum has special photoreceptors in the rod cells inside the human body. When these rod cells are stimulated by blue light, they send signals to the hypothalamus, which inhibits the secretion of melatonin. This is why during the day, melatonin levels are usually relatively low, keeping us awake and alert. However, at night or in low light conditions, there is not enough blue light to stimulate the rod cells, and the secretion of melatonin begins to increase, which is a signal for us to enter a sleep state. Therefore, the present application selects the synergistic effect of purple light with a wavelength of 380-420nm or blue light LED chips with a wavelength of 420-460nm and single or multiple blue phosphors, which increases the spectral coverage near 480nm, effectively improves the spectral intensity between 470-490nm, solves the problem of this type of LED light source increasing the MDER value, can inhibit the formation of melatonin, and can increase the alertness and excitement of the human body.

[0032] The rhythmic lighting sub-field of human-centered lighting has gradually been known and mastered by people, and relevant standards have been introduced one after another. In 2018, the International Commission on Illumination released the standard CIE S 026 / E:2018 "Light Radiation Measurement System for the Response of Photosensitive Retinal Ganglion Cells to Light". The following year, the US DLC (Design Lights Consort) standard proposed that the lighting requirements for light quality and spectral quality should support the physiological regulation functions of alertness, sleep and health, and report the melanopic flux (Melanopic Flux), M / P ratio (M / P Ratio), melanopic equivalent daylight efficiency (MDER) of rhythmic lighting in the lamp report, as well as the spectral energy distribution at intervals of 1nm in the range of 380-780nm. The architectural standard of the US Well standard (version V2) has already included some rhythmic lighting parameters.

[0033] On April 2, 2020, the International Commission on Illumination (CIE) launched a toolbox to support the implementation of the international standard "CIES 026:2018 System for Metrology of Optical Radiation for ipRGC-InfluencedResponses to Light". A beta version of the toolbox was shared with participants at a workshop on this metrology system in 2019. After further testing, the toolbox is now available to support the implementation of the standard.

[0034] The calculation formula for non-visual effects is as follows:

[0035] MDER is the abbreviation of Melanopic Daylight Efficacy Ratio. This indicator was introduced and defined by CIE in CIE S 026 / E:2018, and is sometimes abbreviated as Melanopic DER. This indicator was introduced to evaluate the correlation between the rhythmic effect of artificial light sources and natural light.

[0036] The MDER formula is as follows:

[0037] MDER formula:

[0038] MDER is considered to be the ratio of the circadian rhythm effect of artificial light to natural light. The higher the MDER result, the better the rhythm effect of artificial light. Under the same light flux, the higher the MDER ratio, the more it can inhibit the formation of melatonin, and the lower the M / P ratio, the more it can promote the formation of melatonin.

[0039] An embodiment of the present application provides an LED light source for human rhythmic lighting, including an LED chip, wherein the light-emitting surface of the LED chip is covered with a fluorescent layer; the fluorescent layer includes the following components in parts by weight: 50-70 parts of silica gel and 5-50 parts of blue phosphor; the LED chip includes a purple light chip with an emission wavelength of 380-420nm or a blue light chip with an emission wavelength of 420-460nm.

[0040] The LED chip includes a purple light or blue light LED chip emitting a wavelength of 380-420nm or 420-460nm. The purple light or blue light (380-420nm and 420-460nm) generated by the LED chip can excite the phosphors of different wavelengths in the phosphor layer when covering the fluorescent layer, thereby obtaining a higher excitation efficiency. When the purple light or blue light LED emits light, it will excite the blue phosphor to re-radiate light of the corresponding wavelength, thereby forming a wide-spectrum light source. Moreover, by selecting a 380-460nm purple light chip or a blue light chip, the LED spectrum can also be made close to the spectrum of the human body non-visual effect curve, thereby maintaining a high level of melatonin suppression during the day. In the present application, the phosphor includes a single or mixed blue phosphor with a wavelength of 450-500nm. When the purple light or blue light chip emits light, it excites the blue phosphor to emit light to form a blue light LED light source with a wide spectrum. Moreover, the spectrum of the LED light is highly close to the spectrum of the human body non-visual effect curve, thereby maintaining a high level of melatonin suppression during the day. Such a spectrum can adjust the rhythm of the human body's biological clock, calibrating it to synchronize with the Earth's rotation period, helping to maintain the regular operation of physiological functions.

[0041] In the embodiment of the present application, the number of chips is one or more according to the type of product, which is not limited in the present application, and the number of LED light sources can be adjusted to adjust the brightness of the overall light source. This enables the LED light source to better match specific lighting needs, such as human rhythm lighting.

[0042] In the embodiment of the present application, the blue phosphor includes one or more blue phosphors having an emission wavelength of 450-500 nm.

[0043] As an example, the blue phosphor includes a first blue phosphor with an emission wavelength of 450-475 nm and a second blue phosphor with an emission wavelength of 475-500 nm, wherein the mass percentage of the first blue phosphor is 5-15% and the mass percentage of the second blue phosphor is 25-35%.

[0044] The present application can achieve a wider spectral coverage by combining blue phosphors of different wavelengths. Among them, the wavelength of light emitted by the first blue phosphor covers 450-475nm, and the second blue phosphor covers 475-500nm. This overlap and continuation of wavelengths can provide richer blue light output, enhance the overall brightness and spectral width of the light source, and make the light source more visually uniform and comfortable. Moreover, blue light with a wavelength in the range of 450-500nm can effectively stimulate the photoreceptors of the retina, especially short-wave blue light has a stronger inhibitory effect on regulating melatonin. By using a combination of blue phosphors of different wavelengths, the biostimulation effect of blue light can be more effectively utilized, thereby regulating a person's alertness and sleep state in different time periods.

[0045] The appropriate addition of the first blue phosphor (5-15%) helps to optimize the overall spectral distribution. The first blue phosphor has an emission wavelength of 450-475nm, which can fill the short-wave blue light region in the spectrum. Through this configuration, a smoother spectral transition can be formed, reducing visual discomfort or glare caused by spectral gaps. A higher proportion of the second blue phosphor (25-35%) can significantly enhance the blue light output of the light source. The emission wavelength of the second blue phosphor is 475-500nm, which is in the middle and rear section of the blue light range, and can more effectively stimulate the photoreceptors in the retina, regulate biological rhythms and inhibit the synthesis of melatonin. The higher content ensures that the light source provides sufficient blue light under various lighting conditions to enhance alertness and improve mood. Therefore, the mass percentage of the first blue phosphor is 5-15%, and the mass percentage of the second blue phosphor is 25-35%. This ratio design can enhance the spectral width and visual effect of the light source.

[0046] As an example, the blue phosphor includes a first blue phosphor with an emission wavelength of 450-465nm, a second blue phosphor with an emission wavelength of 465-480nm, and a third blue phosphor with an emission wavelength of 480-500nm, wherein the mass percentage of the first blue phosphor is 35-50%, the mass percentage of the second blue phosphor is 30-40%, and the mass percentage of the third blue phosphor is 15-25%.

[0047] Among them, the first blue phosphor (450-465nm) provides short-wave blue light, the second blue phosphor (465-480nm) covers medium-wave blue light, and the third blue phosphor (480-500nm) supplements long-wave blue light. This wide wavelength distribution ensures that the light source can meet the needs of blue light in different scenarios and enhances the uniformity and brightness of the light. Blue light in the range of 450-500nm can effectively stimulate specific photoreceptors in the retina and inhibit the synthesis of melatonin. Through the multi-wavelength design, alertness can be improved during work and study.

[0048] The blue light output of the light source can be significantly enhanced by a higher proportion (35-50%) of the first blue phosphor. The first blue phosphor mainly emits a wavelength of 450-465nm. Blue light in this band is particularly important for the regulation of biological rhythms, and can effectively stimulate the retina, increase alertness and inhibit the synthesis of melatonin. The higher content ensures the intensity and effect of blue light under a variety of lighting conditions. The moderate proportion of the second blue phosphor (30-40%) helps to optimize the balance of the spectrum. The second blue phosphor emits a wavelength of 465-480nm, which can fill the spectral gap between the first blue phosphor and the third blue phosphor, forming a more uniform spectral distribution, reducing visual discomfort, and improving the overall comfort of the light source. By adding an appropriate amount of the third blue phosphor (15-25%), the luminous efficiency of the LED can be improved.

[0049] In the embodiments of the present application, the blue phosphor includes BaSi2O2N2:Eu or (Sr,Ba)5(PO4)3Cl:Eu. These blue phosphors are doped with elements such as Europium (Eu), and these phosphors can efficiently absorb purple light or blue light excitation and produce blue light emission. This means that the LED light source can produce stronger blue light with relatively low energy input, which helps to improve the brightness of the light source and the spectrum is highly close to the non-visual effect spectrum of the human body. It is more suitable for daytime applications.

[0050] The present application also provides a method for preparing an LED light source for human rhythm lighting, comprising:

[0051] (1) Prepare phosphor mixture

[0052] One or more blue phosphors are mixed in a predetermined ratio to obtain a mixed blue phosphor.

[0053] (2) Preparation of fluorescent glue

[0054] The mixed phosphor in step (1) is mixed with silica gel and stirred sufficiently to make the two mixed evenly. Subsequently, the mixture is placed under vacuum conditions for vacuum degassing to finally obtain fluorescent glue. Vacuum degassing is to remove bubbles in the mixture by reducing pressure so that there are no bubbles in the final fluorescent glue, thereby improving the fluorescence efficiency.

[0055] (3) Apply fluorescent glue

[0056] Take purple light with a peak wavelength of 380-420nm or blue light LED chips with a peak wavelength of 420-460nm, and evenly apply the fluorescent glue prepared in step (2) on the light-emitting surfaces of these LED chips, so that the fluorescent powder mixture is evenly coated on the chip surface.

[0057] (4) Forming LED light source

[0058] Apply the fluorescent glue to the bracket flat cup to finally form the LED light source. This step is usually done by dispensing or other precise coating techniques to make the coating more uniform.

[0059] The embodiment of the present application also provides an LED light-emitting component, which includes a substrate and the above-mentioned LED light source.

[0060] The embodiment of the present application also provides a light-emitting device, which includes a packaging component and the above-mentioned LED light source or the above-mentioned LED light-emitting component, and the packaging component is used to wrap, protect and support the LED light source or the LED light-emitting component. The packaging component includes but is not limited to SMD lamp beads, COB LEDs, LED modules, LED filament lamps and LED light strips. Figure 1 This is a schematic diagram of the structure of the SMD LED lamp bead of the embodiment of the present application. Please refer to Figure 1 The SMD lamp bead is a white light SMD LED lamp bead, which includes: an LED chip 100, a chip electrode 200 and an LED bracket 300, wherein the chip electrodes 200 are respectively at both ends of the LED bracket 300, and are used to lead out the positive and negative poles of the LED chip 100.

[0061] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0062] Example 1

[0063] This embodiment provides an LED light source for human rhythm lighting. The preparation of the LED light source includes the following steps:

[0064] 0.65g of blue phosphor (peak wavelength 450nm) and 0.21g of blue phosphor (peak wavelength 495nm) were mixed with 2g of silica gel to obtain mixed fluorescent glue; and the mixture was fully stirred to mix the two evenly. Subsequently, the mixture was placed under vacuum conditions for vacuum degassing to finally obtain fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of the purple light chip with a peak wavelength of 385-390nm, so that the fluorescent powder mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0065] Example 2

[0066] This embodiment is basically the same as Embodiment 1, except that only blue phosphor with a peak wavelength of 450 nm is used.

[0067] 0.86g of blue phosphor (peak wavelength 450nm) was mixed with 2g of silica gel to obtain a mixed fluorescent glue; and the mixture was fully stirred to mix the two evenly. Subsequently, the mixture was placed under vacuum conditions for vacuum degassing to finally obtain a fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of the purple light chip with a peak wavelength of 385-390nm, so that the phosphor mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0068] Example 3

[0069] This embodiment is basically the same as Embodiment 1, except that only blue phosphor with a peak wavelength of 495 nm is used.

[0070] 0.86g of blue phosphor (peak wavelength 495nm) was mixed with 2g of silica gel to obtain a mixed fluorescent glue; and the mixture was fully stirred to mix the two evenly. Subsequently, the mixture was placed under vacuum conditions for vacuum degassing to finally obtain a fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of the purple light chip with a peak wavelength of 385-390nm, so that the phosphor mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0071] Example 4

[0072] This embodiment is basically the same as Embodiment 1, except that a purple light chip with a peak wavelength of 400-405 nm is used.

[0073] 0.65g of blue phosphor (peak wavelength 450nm) and 0.21g of blue phosphor (peak wavelength 495nm) were mixed with 2g of silica gel to obtain mixed fluorescent glue; and the mixture was fully stirred to make the two mixed evenly. Subsequently, the mixture was placed under vacuum conditions and vacuum degassed to finally obtain fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of the purple light chip with a peak wavelength of 400-405nm, so that the fluorescent powder mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0074] Example 5

[0075] This embodiment is basically the same as Embodiment 4, except that only blue phosphor with a peak wavelength of 450 nm is used.

[0076] 0.86g of blue phosphor (peak wavelength 450nm) was mixed with 2g of silica gel to obtain a mixed fluorescent glue; and the mixture was fully stirred to mix the two evenly. Subsequently, the mixture was placed under vacuum conditions for vacuum degassing to finally obtain a fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of a purple light chip with a peak wavelength of 400-405nm, so that the phosphor mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0077] Example 6

[0078] This embodiment is basically the same as Embodiment 4, except that only blue phosphor with a peak wavelength of 495 nm is used.

[0079] 0.86g of blue phosphor (peak wavelength 495nm) was mixed with 2g of silica gel to obtain a mixed fluorescent glue; and the mixture was fully stirred to mix the two evenly. Subsequently, the mixture was placed under vacuum conditions for vacuum degassing to finally obtain a fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of the purple light chip with a peak wavelength of 400-405nm, so that the phosphor mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0080] Example 7

[0081] This embodiment is basically the same as Embodiment 6, except that a blue light chip with a peak wavelength of 450-455 nm is used.

[0082] 0.65g of blue phosphor (peak wavelength 450nm) and 0.21g of blue phosphor (peak wavelength 495nm) were mixed with 2g of silica gel to obtain mixed fluorescent glue; and the mixture was fully stirred to make the two mixed evenly. Subsequently, the mixture was placed under vacuum conditions and vacuum degassed to finally obtain fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of the blue light chip with a peak wavelength of 450-455nm, so that the fluorescent powder mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0083] Example 8

[0084] This embodiment is substantially the same as the embodiment 4, except that three types of blue phosphors are used, and the peak wavelengths of the three types of blue phosphors are 450 nm, 470 nm and 495 nm, respectively.

[0085] 0.344g of blue phosphor (peak wavelength 450nm), 0.301g of blue phosphor (peak wavelength 470nm) and 0.215g of blue phosphor (peak wavelength 495nm) were mixed with 2g of silica gel to obtain a mixed fluorescent glue; and the mixture was fully stirred to mix the two evenly. Subsequently, the mixture was placed under vacuum conditions and vacuum degassed to finally obtain a fluorescent glue; then, the fluorescent glue was evenly applied on the light-emitting surface of a blue light chip with a peak wavelength of 450-455nm, so that the fluorescent powder mixture was evenly applied to the chip surface; the fluorescent glue was applied to the bracket flat cup to obtain an LED light source.

[0086] Comparative Example 1

[0087] This comparative example is basically the same as Example 1, except that a chip with a wavelength of 460-465 nm is used.

[0088] Comparative Example 2

[0089] This comparative example is basically the same as Example 3, except that a chip with a wavelength of 460-465 nm is used.

[0090] The key parameters of the above embodiments and comparative examples are shown in Table 1.

[0091] Table 1

[0092]

[0093] Test Example 1

[0094] 1. This test example measures the MDER value, luminous flux and luminous efficacy of the LED light sources provided in Examples 1-8 and Comparative Examples 1-2, respectively.

[0095] Luminous flux measurement: Luminous flux is measured on the HAAS2000-V3 test system of Hangzhou Yuanfang Optoelectronics. The specific test method is: install the LED lamp on the test fixture, enter the test current in the control software, click test, and the test is completed in about 5 seconds and a test report is generated.

[0096] Light efficiency measurement: Light efficiency measurement is the same as above.

[0097] Please see Table 2 for the measurement results of MDER value, luminous flux and luminous efficacy.

[0098] Table 2

[0099]

[0100]

[0101] As can be seen from Table 2, the MDER values ​​of the LED light sources provided in Examples 1-8 of the present application under different schemes are all greater than 1.7. This indicates that the LED light sources provided in Examples 1-8 of the present application can effectively inhibit the production of melatonin, making people more alert and excited. In addition, Example 4 has a higher light efficiency and MDER value, indicating that under the same LED chip and current, the LED light source provided in Example 4 of the present application produces a higher brightness.

[0102] 2. This test example measures the luminous flux maintenance rate of the LED light sources provided in Examples 1, 2, and 7 under normal temperature conditions (25°C) and high temperature and high humidity conditions (85°C / RH85%) to evaluate the lifespan of different LED light sources.

[0103] Luminous flux maintenance rate (%) = (luminous flux at the end of life / luminous flux at the initial life) × 100%. Among them, "luminous flux at the end of life" refers to the luminous flux of the light source at the end of a certain life period (usually in hours). "Luminous flux at the initial life" refers to the luminous flux of the light source when it is initially installed and used. The higher the value of the luminous flux maintenance rate, the smaller the light attenuation of the light source and the better it is maintained.

[0104] At the same time, the spectrum of the LED light sources provided in Example 4 and Example 6 is measured. The spectrum diagrams of the LED light sources provided in Example 6 and Example 4 are respectively as follows: Figure 2 and Figure 3 As shown, Figure 4 For the comparison diagram of LED spectrum and melatonin sensitive spectrum in Example 4 of this application, please refer to Figure 2-Figure 4 Through testing, it was found that the LED light sources provided in Examples 4 and 6 of the present application both have a high spectral intensity near 480nm, which means that the non-visual effect spectrum of the LED light source is strong and can effectively inhibit the formation of melatonin.

[0105] The luminous flux maintenance rate is measured on the HAAS2000-V3 test system of Hangzhou Yuanfang Optoelectronics. The specific test method is: install the LED lamp on the test fixture, input the test current in the control software, click test, and the test is completed in about 5 seconds and a test report is generated. Please see Table 3 for the measurement results of the luminous flux maintenance rate of the LED light source at room temperature and high temperature.

[0106] Table 3

[0107]

[0108] Referring to Table 2 and Table 3, it can be seen that the LED light source provided by the present application uses a purple light chip with an emission wavelength of 380-420nm or a blue light chip with an emission wavelength of 420-460nm, and the light efficiency and light flux can be significantly improved after adding one or more blue phosphors to the LED light source; by comparing the data of Examples 1-8, it can be seen that the use of a 400-405nm chip is more conducive to improving the light efficiency and light flux, because the light flux of a single chip blue light is not high. The 400-405nm chip excites the 450-500nm phosphor, and the excitation efficiency is higher.

[0109] It can be seen from Table 3 that the luminous flux maintenance rates of the LED light sources provided in Examples 1, 2, and 7 of the present application are greater than 94.7% at room temperature 25°C, and greater than 92.6% at high temperature and humidity 85°C / RH85%, indicating that the light attenuation of the LED light sources provided in Examples 1, 2, and 7 of the present application is very small, indicating that the brightness of the light source will not decrease significantly, and even after long-term use, its light output is still not much different from the initial level, that is, the light source can maintain a stable lighting level, thereby effectively inhibiting the production of melatonin.

[0110] from Figure 2-Figure 4 It can also be seen that the spectrum of the LED light source provided in Example 4 of the present application highly coincides with the non-visual effect curve of the human body, which can effectively inhibit the formation of melatonin and make people more alert and excited.

[0111] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

Claims

1. An LED light source for human rhythm lighting, characterized in that: It comprises an LED chip, wherein the light emitting surface of the LED chip is covered with a fluorescent layer; The fluorescent layer comprises the following components in parts by weight: 50-70 parts of silica gel, 5-50 parts of blue phosphor; The blue phosphor comprises one or more blue phosphors having an emission wavelength of 450-500 nm; The LED chip includes a purple light chip with an emission wavelength of 380-420nm or a blue light chip with an emission wavelength of 420-460nm.

2. The LED light source for human rhythm lighting according to claim 1, characterized in that: The blue phosphor includes a first blue phosphor having an emission wavelength of 450-475 nm and a second blue phosphor having an emission wavelength of 475-500 nm.

3. The LED light source for human rhythm lighting according to claim 2, characterized in that: In the blue phosphor, the mass percentage of the first blue phosphor is 5-15%, and the mass percentage of the second blue phosphor is 25-35%.

4. The LED light source for human rhythm lighting according to claim 1, characterized in that: The blue phosphor includes a first blue phosphor with an emission wavelength of 450-465 nm, a second blue phosphor with an emission wavelength of 465-480 nm, and a third blue phosphor with an emission wavelength of 480-500 nm.

5. The LED light source for human rhythm lighting according to claim 4, characterized in that: In the blue phosphor, the mass percentage of the first blue phosphor is 35-50%, the mass percentage of the second blue phosphor is 30-40%, and the mass percentage of the third blue phosphor is 15-25%.

6. The LED light source for human rhythm lighting according to any one of claims 1 to 5, characterized in that: The LED chip is a purple light chip with an emission wavelength of 400-405nm.

7. The LED light source for human rhythm lighting according to any one of claims 1 to 5, characterized in that: The blue phosphor includes BaSi2O2N2:Eu or (Sr,Ba)5(PO4)3Cl:Eu.

8. An LED light-emitting component, characterized in that: The LED light-emitting component comprises a substrate and an LED light source for human rhythm lighting according to any one of claims 1 to 7.

9. A light emitting device, characterized in that: The light-emitting device includes a packaging component and the LED light source for human rhythm lighting according to any one of claims 1 to 7 or the LED light-emitting component according to claim 8, and the packaging component is used to wrap, protect and support the LED light source for human rhythm lighting or the LED light-emitting component.

10. The light emitting device according to claim 9, characterized in that: The packaging components include one or more of SMD lamp beads, COB LEDs, LED modules, LED filament lamps and LED light strips.

Images