CN108922956A

CN108922956A - A kind of low blue light LED light source and lighting device

Info

Publication number: CN108922956A
Application number: CN201810681560.6A
Authority: CN
Inventors: 曾胜; 曾骄阳; 曾灵芝; 陈俊达; 陈道蓉; 许瑞龙
Original assignee: Langchao Innovation Holdings (shenzhen) Co Ltd
Current assignee: Langchao Innovation Holdings (shenzhen) Co Ltd
Priority date: 2018-06-27
Filing date: 2018-06-27
Publication date: 2018-11-30

Abstract

The present invention provides a kind of low blue light LED light source, the substrate including being equipped with conducting wire, and the light emitting structure for being set on substrate and connecting with conducting wire；Light emitting structure includes white-light emitting body and red emitting luminophores, and white-light emitting body includes blue chip and the optical transition layer that is set to outside blue chip, and red emitting luminophores include red light chips, and white light mixes acquisition near-nature forest light with feux rouges；The total light flux of white-light emitting body and total light radiation ratio of red emitting luminophores are 2-10:1；Blue light color ratio in near-nature forest light is less than 5.7%；The relative spectral power of blue light is less than 0.75；The relative spectral power of feux rouges is greater than 0.60.In the light that this light source issues, blue light is lower, and visual experience is more comfortable, is conducive to protect eyesight and reduce due to the excessively high caused inferior health problem of blue light.The relative spectral power of feux rouges is improved, and then improves illumination Health Category.

Description

Low blue light LED light source and lighting device

Technical Field

The invention relates to the technical field of LEDs, in particular to a low-blue-light LED light source and a lighting device.

Background

The existing light sources for lighting are various, and the common light source has unnatural light color due to incomplete spectrum, so people feel unnatural and uncomfortable. Moreover, the blue light component is high, and the injury to human eyes is great. The visible range to the unaided human eye was 390-760 nm. Among them, ultraviolet, violet and blue light are the most harmful to human eyes. The purple light damages eyes in the front half part of the eyeball, and the blue light damages eyes in the back half part of the eyeball, which can cause pathological changes in a macular area and even cause blindness seriously. The damage of blue light to eyes, especially to the vision of underage students and children is obvious, which can cause the problems of color weakness, myopia and the like of children. Meanwhile, when the lamp is in a high-blue-light illumination environment for a long time or watches electronic equipment for a long time, phenomena of headache, poor spirit and the like can occur, and the health of people is seriously influenced. With the development of lighting technology, the overall performance requirements of people on light quality, comfort level and the like are continuously improved, the most ideal lighting light is natural light, and the natural light illumination is always a vision of the lighting industry.

Fig. 12 illustrates the spectrum of a white light source using a blue chip combined with a phosphor, and the wavelength range and the luminous intensity of the chip and the wavelength range of the phosphor are limited, so that the spectrum of the combined structure is still greatly different from that of natural light, especially the blue light ratio is too high. Fig. 13 illustrates the spectrum of a white light source using a combination of chips with multiple wavelengths, such as a three primary color combination structure of a red chip, a green chip, and a blue chip, wherein the white light has a distinct peak of three central wavelengths of red, green, and blue, and the blue light has a higher proportion. Providing healthy low blue illumination has become an urgent problem to be solved.

Disclosure of Invention

The invention aims to provide a low-blue-light LED light source, and aims to solve the technical problem that the blue light of the traditional near-natural-light LED light source is too high, so that the eyesight of people is protected, and the health level is improved.

The invention is realized in such a way that a low blue light LED light source comprises a substrate provided with a conducting circuit and at least one group of light-emitting structures which are arranged on the substrate and connected with the conducting circuit; the light-emitting structure comprises a white light-emitting body and a red light-emitting body, the white light-emitting body comprises a blue light chip and an optical conversion layer arranged outside the blue light chip, the red light-emitting body comprises a red light chip, white light emitted by the white light-emitting body and red light emitted by the red light-emitting body are mixed to obtain near-natural light, and the red light is used for compensating a red light part of the white light relative to the loss of a natural spectrum; the ratio of the total luminous flux of the white light luminophor to the total light radiation quantity of the red light luminophor is 2-10: 1; the blue light color ratio in the near natural light is less than 5.7%; the relative spectral power of blue light in the near-natural light is less than 0.75; the relative spectral power of the red light in the near natural light is more than 0.60.

Further, the color temperature range of the near natural light is 2500K-6500K, the color tolerance is less than 5, the color rendering index Ra is greater than 95, the color rendering index of R9 is greater than 90, and the color rendering index of R12 is greater than 80; at color temperatures above 4000K, the relative spectral power of the blue light remains less than 0.75 and the blue color ratio remains less than 5.7%.

Further, the relative spectral power of 440nm blue light in the near natural light is lower than 0.65.

Further, when the color temperature of the near-natural light is 2700K-3000K, the relative spectral power of the 440nm blue light is lower than 0.50;

when the color temperature of the near-natural light is 4000K-4200K, the relative spectral power of the 440nm blue light is lower than 0.60;

when the color temperature of the near-natural light is 5500K-6000K, the relative spectral power of the blue light with the wavelength of 440nm is lower than 0.65.

Further, the relative spectral power of orange light in the near natural light is greater than 0.55;

the relative spectral power of yellow light in the near-natural light is more than 0.50;

the relative spectral power of green light in the near-natural light is greater than 0.35;

the relative spectral power of cyan light in the near natural light is greater than 0.30;

the relative spectral power of purple light in the near-natural light is less than 0.10.

Further, the wavelength range of the blue light chip is 450-480 nm; the wavelength of the red light chip is 640-700 nm; in one group of light-emitting structures, the number ratio of the blue light chips to the red light chips is 1-8: 1; the blue light chip and the red light chip are arranged on the substrate in an inverted or normal mode.

Further, the optical conversion layer is a fluorescent layer or a phosphorescent layer, the fluorescent layer comprises colloid and fluorescent powder mixed in the colloid, and the fluorescent powder comprises red powder, green powder and yellow-green powder;

the color coordinate of the red pink is X: 0.660 to 0.716, Y: 0.340-0.286;

the color coordinate of the green powder is X: 0.064-0.081, Y: 0.488-0.507;

the color coordinate of the yellow-green powder is X: 0.367 to 0.424, Y: 0.571 to 0.545;

the weight ratio of the red powder to the green powder to the yellow-green powder is as follows:

red powder: green powder: yellow-green powder (0.010-0.035): (0.018-0.068): 0.071-0.253);

the concentration of the fluorescent layer is 17% -43%;

the particle sizes of the red powder, the green powder and the yellow-green powder are all less than 15 mu m.

Further, the conductive circuit comprises a group of positive and negative electrodes, and the white light luminous bodies and the red light luminous bodies are connected in series, electrically connected to the positive and negative electrodes, and driven uniformly by the same driving current.

Further, the conductive circuit comprises at least two groups of positive and negative electrodes, and the white light luminous bodies and the red light luminous bodies are respectively electrically connected to the positive and negative electrodes of different groups and are respectively driven by different driving currents.

Another object of the present invention is to provide a lighting device comprising any of the low blue LED light sources described above.

The light source provided by the embodiment of the invention at least has the following effects:

first, in the light that this light source sent, the blue light colour ratio is less than 5.7%, and relative spectral power is less than 0.75, compares in traditional white light illumination, and the blue light is lower, and visual perception is more comfortable, is favorable to protecting eyesight, especially infant and children's eyesight, still is favorable to reducing because the sub-health problem that the blue light is too high to lead to.

Secondly, the proportion of blue light is reduced on the basis of emitting near-natural light by the light source, namely, the light emitted by the light source can cover the wave bands of the natural light, and each wave band is close to the relative spectral power of the natural light, so that the damage of the blue light to health can be reduced while a more natural lighting effect is provided.

Thirdly, the red light illuminant is combined to compensate the red light missing component of the white light, the relative spectral power of the red light is improved, the spectrum is closer to the natural light, the 640-ion 700nm red light has the health care function, and the health level of the near-natural light illumination is further improved.

And fourthly, the near natural light is obtained by adopting the combination of the white light luminophor and the red light luminophor, the structure is simple, the variable controllability is good in the debugging process, the debugging of the near natural light is realized, the problem that the near natural light cannot be obtained by combining a plurality of luminophors is solved, the near natural light is obtained by supplementing the red light luminophor, and the problem that the near natural light cannot be obtained by combining a blue light chip and fluorescent glue is solved.

Fifthly, the white light luminous body and the red light luminous body can adopt micro luminous bodies meeting performance requirements, the whole light source is a micro lamp bead, a plurality of lamp beads can be arranged on the conductive circuit board of various lamps in any form, and due to the small size, the micro lamp bead can be arranged at any position of the conductive circuit board, the application is flexible, the whole light of the lamp is uniform, and the lighting effect is good.

Drawings

Fig. 1 is a schematic perspective view of a low-blue LED light source according to an embodiment of the present invention;

FIG. 2 is a top view of a low blue LED light source provided by an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a low blue LED light source provided by an embodiment of the present invention;

FIG. 4 is a bottom view of a low blue LED light source provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a white light emitter of a low-blue LED light source according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a spectrum of near natural light provided by an embodiment of the present invention;

FIG. 7 is a report of a near natural light spectrum test of FIG. 6;

FIG. 8 is a graph comparing spectra of a low blue LED light source and natural light provided by embodiments of the present invention;

FIG. 9 is a comparison graph of spectra of a conventional near natural light source and natural light;

FIG. 10 is a spectrum of a white light emitter provided by an embodiment of the present invention;

FIG. 11 is a spectrum of white light using a 452.5-455nm blue light chip according to an embodiment of the present invention;

FIG. 12 is a first spectral plot of a prior art white light source;

FIG. 13 is a second spectral diagram of a prior art white light source;

FIG. 14 is a spectral diagram of a prior art near natural light source.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

In order to explain the technical solution of the present invention, the following detailed description is made with reference to the specific drawings and examples.

Explanation of technical terms:

1. relative spectral power:

the spectrum emitted by a light source is often not a single wavelength, but consists of a mixture of many different wavelengths of radiation. The spectral radiation of the light source in wavelength order and the intensity distribution of the individual wavelengths is referred to as the spectral power distribution of the light source.

The parameters for characterizing the magnitude of the spectral power are divided into absolute spectral power and relative spectral power. And then the absolute spectral power distribution curve: refers to a curve made of absolute values of the energy of various wavelengths of the spectral radiation;

relative spectral power distribution curve: the spectral power distribution curve is a spectral power distribution curve in which energies of various wavelengths of a light source radiation spectrum are compared with each other, and the radiation power is changed only within a predetermined range after normalization processing. The relative spectral power with the maximum radiation power is 1, and the relative spectral power of other wavelengths is less than 1.

2. Color ratio:

any white light can be obtained by mixing the three primary colors of red, green and blue in corresponding proportion, and chromaticity coordinates R, G and B are introduced in order to represent the relative proportion of the R, G, B primary colors in the total white light, wherein R is R/(R + G + B), G is G/(R + G + B), B is B/(R + G + B), R + G + B is 1, and R, G and B are respectively a red color ratio, a green color ratio and a blue color ratio.

Referring to fig. 1 to 5, an embodiment of the invention provides a low-blue LED light source (hereinafter, referred to as "the light source") for various lighting devices. The low-blue LED light source comprises a substrate 10 provided with a conducting circuit 30 and at least one group of light-emitting structures 20 which are arranged on the substrate 10 and connected with the conducting circuit 30; the light emitting structure 20 comprises a white light emitting body 21 and a red light emitting body 22, the white light emitting body 21 comprises a blue light chip 211 and an optical conversion layer 212 arranged outside the blue light chip 211, the red light emitting body 22 comprises a red light chip, the white light emitted by the white light emitting body 21 and the red light emitted by the red light emitting body 22 are mixed to obtain near-natural light, and the red light is used for compensating the missing part of the white light relative to the natural spectrum; the ratio of the total luminous flux of the white light luminophor 21 to the total light radiation quantity of the red light luminophor is 2-10: 1; the blue light color ratio in the near natural light is less than 5.7 percent; the relative spectral power of the blue light is less than 0.75. And, the relative spectral power of red light in near natural light is greater than 0.60.

In the field of LED lighting, it is one of the development trends in this field to research lighting sources close to natural light, and many researchers and units have been in the direction of effort, and there are some lighting products in the prior art that aim to approach natural light, and generally refer to such products as "near natural light", where the light generated by such products is close to natural light in spectral shape (relative spectral power of corresponding wavelength band), and at least part of the optical parameters are close to natural light, and the degree of this proximity is not limited to a certain value. The low blue light LED light source in this embodiment can realize the illuminating effect that is close to with the natural light equally to can reduce the proportion of blue light, improve the ruddiness proportion.

Specifically, as described above, the basic support structure of the light source is the substrate 10, the light emitting structures 20 are disposed on the substrate 10, the number of the light emitting structures 20 is one, two or more, and the structures and functions of the light emitting structures 20 are identical. This embodiment is preferably a group. Each group of light emitting structures 20 comprises a white light emitter 21 and a red light emitter 22, i.e. the present light source emits near-natural light by a mixture of white light and red light. The red light is used for compensating the part of the white light which is lacked relative to the natural spectrum, and then near natural light is formed.

The wavelength ranges of various colors of visible light are as follows: red light (622-700 nm), orange light (597-622 nm), yellow light (577-597 nm), green light (492-577 nm), cyan light (475-492 nm), blue light (435-475 nm) and purple light (380-435 nm).

Fig. 6 to 8 respectively illustrate a spectrum diagram and spectrum test data of the low-blue light source of the present embodiment, and it can be seen from the diagram that the spectrum is close to the spectrum of natural light, the proportion of blue light is reduced, and the proportion of red light is increased. Referring to fig. 9, the existing near-natural light spectrum and natural light spectrum still have a large difference, and the blue light component is highest in all bands, while a significant deficiency occurs in the red light portion.

Thirdly, the relative spectral power of the red light is improved, so that the spectrum is closer to the natural light, and the 640-700nm red light has a health care function, thereby improving the health level of the near-natural light illumination.

Further, in the field, according to the rules of a large number of traditional white lights, the color temperature of the white light is higher, the proportion of short wavelength components of the white light is higher, the blue light is higher, even the purple light is higher, the harm of the high blue light to health is an unambiguous fact, meanwhile, the high color temperature is favorable for improving the identification degree, the brightness of the environment is improved, the mental state of people is also an accepted common knowledge, the conventional light source is generally the white light with the high color temperature and the high blue light, and the advantages and the disadvantages are certainly possessed, and the requirements of all aspects are difficult to be considered. According to fig. 7, the light source still satisfies the condition that the relative spectral power of blue light is less than 0.75 under the condition of high color temperature of more than 4000K, is high-color-temperature low-blue-light illumination, and can simultaneously have the effects of eye health and mental state excitation.

In the present embodiment, the optical conversion film 212 of the white light emitter 21 is a fluorescent film or a phosphorescent film, the first chip 211 is a blue light chip, and the wavelength range of the blue light chip is 450-; the wavelength range of the red light chip is 640-700nm, and specifically, the wavelength range may be a smaller range within the range, for example, the wavelength range is 680-700nm, and the corresponding center wavelength is 690 + -5 nm. The center wavelength is typically the center of the wavelength range and allows a tunable interval around ± 2 nm. The central wavelength may also be 660nm, 670nm, 680nm, etc. for different intervals, and the embodiment is not limited to one. Preferably, the blue chip has a wavelength ranging from 457.5 to 480nm, which contributes to increase the proportion of cyan light, as described in detail later.

The fluorescent film comprises colloid and fluorescent powder mixed in the colloid, and the fluorescent powder comprises red powder, green powder and yellow-green powder; the color coordinate of the red powder is X: 0.660 to 0.716, Y: 0.340-0.286; the color coordinate of the green powder is X: 0.064-0.081, Y: 0.488-0.507; the color coordinate of the yellow-green powder is X: 0.367 to 0.424, Y: 0.571 to 0.545; the weight ratio of red powder, green powder and yellow-green powder is as follows: red powder: green powder: yellow-green powder (0.010-0.035): (0.018-0.068): 0.071-0.253); the concentration of the fluorescent film is 17-43%. The particle size of red powder, green powder and yellow-green powder is less than 15 μm, preferably 13 + -2 μm.

By selecting the blue chip and the fluorescent film, white light can be obtained, the spectrum of which is shown in fig. 10. It has the following optical parameters: when the color temperature is 2700K-3000K, the relative spectral power of 480-500nm waveband is more than 0.30; the relative spectral power of the 500-640nm waveband is more than 0.70; when the color temperature is 4000K-4200K, the relative spectral power of 480-500nm waveband is more than 0.45; the relative spectral power of the 500-640nm waveband is more than 0.65; when the color temperature is 5500K-6000K, the relative spectral power of the 480-plus 500nm waveband is more than 0.4; the relative spectral power of the 500-640nm wave band is more than 0.60. The white light emitter 21 can be combined with the red light emitter 22 to obtain a low-blue near-natural-light LED light source.

Further, the red phosphor is preferably a nitride red phosphor, and more preferably, the nitride red phosphor includes CaSrAlSiN3(1113 structure). And the green phosphor is preferably oxynitride green phosphor, and more preferably, the oxynitride green phosphor comprises BaSi2O2N2(1222 structure). And the yellow-green powder preferably comprises Y3Al5Ga5O12 (i.e., gallium-doped yttrium aluminum garnet). The CaSrAlSiN3 nitride red fluorescent powder, the BaSi2O2N2 nitrogen oxide green fluorescent powder and the Y3Al5Ga5O12 yellow-green fluorescent powder can reach color coordinates required by the respective fluorescent powder, have better luminous intensity and stability, and are very suitable for being used in the fluorescent powder of the embodiment of the invention. The above-mentioned kinds of phosphors are commercially available.

Example 1 as a fluorescent film:

a fluorescent film comprises AB silica gel, CaSrAlSiN3 red phosphor (color coordinate, X: 0.660-0.716, Y: 0.286-0.340), BaSi2O2N2 green phosphor (color coordinate, X: 0.064-0.081, Y: 0.488-0.507) and Y3Al5Ga5O12 yellow-green phosphor (color coordinate, X: 0.367-0.424, Y: 0.545-0.571); wherein, the weight ratio of CaSrAlSiN3 red phosphor, BaSi2O2N2 green phosphor and Y3Al5Ga5O12 yellow-green phosphor is (0.020-0.035): (0.018-0.030): (0.140-0.253), and the mass percentage of the three fluorescent powders in the fluorescent film is 33-43%.

The fluorescent film can obtain near-natural white light with the color temperature of 2700K-3000K through blue light excitation: in the spectrum, the relative spectrum of 480-500nm band is greater than 0.30, and the relative spectrum of 500-640nm band is greater than 0.70.

Example 2 as a fluorescent film

A fluorescent film comprises AB silica gel, CaSrAlSiN3 red phosphor (color coordinate, X: 0.660-0.716, Y: 0.286-0.340), BaSi2O2N2 green phosphor (color coordinate, X: 0.064-0.081, Y: 0.488-0.507) and Y3Al5Ga5O12 yellow-green phosphor (color coordinate, X: 0.367-0.424, Y: 0.545-0.571); wherein, the weight ratio of CaSrAlSiN3 red phosphor, BaSi2O2N2 green phosphor and Y3Al5Ga5O12 yellow-green phosphor is (0.010-0.022): (0.020-0.040): (0.080-0.140), and the mass percentage of the three kinds of fluorescent powder in the fluorescent film is 25-35%.

The fluorescent film can obtain near-natural white light with the color temperature of 4000K-4200K by being excited by blue light: in the spectrum, the relative spectrum of 480-500nm band is greater than 0.45, and the relative spectrum of 500-640nm band is greater than 0.65.

Example 3 as a fluorescent film

A fluorescent film comprises AB silica gel, CaSrAlSiN3 red phosphor (color coordinate, X: 0.660-0.716, Y: 0.286-0.340), BaSi2O2N2 green phosphor (color coordinate, X: 0.064-0.081, Y: 0.488-0.507) and Y3Al5Ga5O12 yellow-green phosphor (color coordinate, X: 0.367-0.424, Y: 0.545-0.571); wherein, the weight ratio of CaSrAlSiN3 red phosphor, BaSi2O2N2 green phosphor and Y3Al5Ga5O12 yellow-green phosphor is (0.010-0.020): (0.030-0.068): (0.071-0.130), the mass percentage of the three kinds of fluorescent powder in the fluorescent film is 17-27%.

The fluorescent film can obtain white light of near natural light with color temperature of 5500K-6000K by blue light excitation: in the spectrum, the relative spectrum of 480-and 500-nm bands is greater than 0.40, and the relative spectrum of 500-and 640-nm bands is greater than 0.60.

Further, referring to fig. 8 and 9, the spectrum of the light source is also very similar to that of natural light in other bands, which is difficult to be realized by the existing near-natural light source. As shown in fig. 6 and 7, the relative spectral power of orange light in near natural light is greater than 0.55; the relative spectral power of the yellow light is greater than 0.50; the relative spectral power of the green light is greater than 0.35; the relative spectral power of the cyan light is greater than 0.30; the relative spectral power of the purple light is less than 0.10 and is close to that of natural light.

In addition, the light source is more optimized in spectrum of each waveband, and has strict optical parameter requirements, such as color temperature, color tolerance, color rendering index Ra, color rendering index R9, color rendering index R12, blue light color ratio and the like. Specifically, the color temperature of the near-natural light comprises 2500K-6500K, and the color tolerance is less than 5. The apparent index Ra is more than 95, wherein the apparent index of R9 is more than 90, and the apparent index of R12 is more than 80. It can be determined from fig. 7 that the light source can satisfy the above requirements, and the blue light color ratio of the light source can be reduced to below 5.5%, the color rendering index Ra is increased to above 97, the color rendering index R9 is increased to above 95, the color rendering index R12 is increased to 83, and in other test reports, the color rendering index R12 is increased to 87.

Further, the blue light of 440nm in the blue light has the greatest damage to vision, and as a further optimization scheme, the relative spectral power of the blue light of 440nm is also used as an optical parameter to be detected in the embodiment. The relative spectral power of 440nm blue light is below 0.65 with a blue light color ratio below 5.7%. This is difficult to achieve with existing eye-protection electronic devices. The existing eye-protecting electronic product has low blue light color ratio, but the inhibition of 440nm blue light which has the greatest damage to human eyes is not obvious, and the eye-protecting function is very little. Other waveband components in the blue light are necessary for visual development, so that the effect of protecting eyes is not obvious when the blue light is greatly inhibited, and adverse effects are caused to the visual development of people such as children and infants, for example, the problems of poor color, reduced color discrimination capability and the like caused by excessive deficiency of the blue light component. In this embodiment, the effect of protecting eyesight can be truly achieved by focusing on the suppression of the intensity of blue light of 440nm on the basis of reducing the blue light color ratio to 5.7% or less. Specifically, when the color temperature of the near-natural light is 2700K-3000K, the relative spectral power of the 440nm blue light is lower than 0.50; when the color temperature of the near natural light is 4000K-4200K, the relative spectral power of the 440nm blue light is lower than 0.60; when the color temperature of the near natural light is 5500K-6000K, the relative spectral power of the blue light with the wavelength of 440nm is lower than 0.65.

According to the invention, a large number of debugging experiments are carried out by taking the optical parameters and the spectrum as targets, the white light luminous body 21 and the red light luminous body 22 are finally determined to be adopted, the ratio of the luminous flux of the white light luminous body 21 to the light radiation quantity of the red light luminous body 22 is determined, and the luminous bodies with proper specifications and quantity are selected to manufacture the light source based on the ratio and the corresponding electrical parameters determined by the experiments.

Preferably, a miniature white light emitter 21 and a miniature red light emitter 22 are adopted, a blue light chip and a red light chip which are small in size and high in cost performance are selected according to the luminous flux ratio and the size of an installation space, the red light emitter 22 and the white light emitter 21 which are as few as possible are preferably selected to be manufactured into a single light source, and one light source is provided with a group of light-emitting structures 20. The light source can directly emit near-natural light, so that the light source can be used in various lamps, can be combined randomly, can ensure a better light-emitting effect and has strong adaptability. Of course, multiple sets of light emitting structures 20 may be integrated into one light source, so that a better light emitting effect can be ensured and only the size is increased.

In particular, the ratio of the luminous flux of the white emitter 21 to the light radiation of the red emitter 22 is 2-10:1, preferably 2-3: 1. At different color temperatures, the ratio slightly floated. In one embodiment, the ratio of the number of white light emitters 21 to the number of red light emitters 22 is 1-8:1, more preferably 1-4: 1. the actual light radiation quantity of the red light emitter 22 is 80-160mW, and the total luminous flux of the white light emitter 21 is 200-350 lm.

In one embodiment, there are four white light emitters 21, one red light emitter 22, and four white light emitters 21 are disposed around the red light emitter 22 and uniformly distributed.

In another embodiment, there are two white light emitters 21 and one red light emitter 22, and the two white light emitters 21 are symmetrically disposed on two sides of the red light emitter 22.

Regarding the mounting means of chip, preferably adorn blue light chip and ruddiness chip in the surface of substrate 10, flip chip is favorable to and substrate 10 on conducting wire 30 effective connection, is favorable to high-efficient heat dissipation, can unify the film formation through equipment on the chip, guarantees that the fluorescent film uniformity of different products is good, and then can avoid just installing the gluey process of chip and cause the poor problem of uniformity, simultaneously for different products are in same BIN position at the colour temperature is the same, and the colour temperature uniformity is good.

In addition, the flip chip also enables the volume of the white light emitter 21 to be further reduced, which is beneficial to the control of the light source size. In the present embodiment, the width of the white light emitter 21 is less than 0.8mm, the height is less than 0.3mm, and the red light emitter 22 can be controlled in the same range. The distance between the adjacent white light luminous bodies 21 and the adjacent red light luminous bodies 22 is less than 1 mm. The length of the light source is less than or equal to 6mm, and the width of the light source is less than 3 mm.

Of course, the invention is not limited to the use of flip chips, as it is also feasible to use face-up chips.

In an embodiment, the substrate 10 is preferably a laminated structure made of a non-metallic material, the substrate 10 is provided with a reflective cup 11, the white light emitter 21 and the red light emitter 22 are disposed in the reflective cup 11, the conductive traces 30 are formed on the surface of the substrate 10 and wrap the front and back surfaces of the substrate 10, and form pins outside the reflective cup 11, and a portion of the conductive traces 30 is exposed at the bottom of the reflective cup 11 for connecting the white light emitter 21 and the red light emitter 22.

Furthermore, the inner wall of the reflective cup 11 is provided with a reflective surface 111, the reflective cup 11 is further filled with an encapsulant (not shown), the reflective surface 111 is used for reflecting the white light and the red light, and the encapsulant is used for protecting the internal structure of the reflective cup 11, stabilizing the light source structure, and adjusting the light refraction. The white light and the red light are fully mixed and then output through the packaging colloid. Specifically, the light emission angles of the white light emitter 21 and the red light emitter 22 may be about 160 °, and preferably greater than 160 °, and the light emission angle of the light source is about 120 °. The whole light source is a small-sized near-natural-light lamp bead which can uniformly emit light.

In this embodiment, the conductive circuit 30 has a plurality of sets of positive and negative pins, and each light emitter may correspond to one set of positive and negative pins, or a plurality of light emitters correspond to one set of positive and negative pins. In the driving manner, there are two embodiments, one of which is that the white light emitter 21 and the red light emitter 22 are respectively connected to different positive and negative pins for independent driving, and at this time, the respective driving currents are different and can be controlled by matching with a control chip. Secondly, the white light emitter 21 and the red light emitter 22 are connected in series, namely, connected with the same positive and negative pins, and driven by the same current uniformly without being controlled by a control chip.

Referring to fig. 1 and 2, two white light emitters 21 and one red light emitter 22 are connected in series, the two white light emitters 21 are respectively connected to a first pin 31, and the first pin 31 extends out from the bottom of the reflective cup 11 for connecting to an external power source. The red light emitter 22 is connected in series between the two white light emitters 21.

Further, the light source may further be provided with a second pin 32, and the second pin 32 is not used for connecting an external power source, but is used for dissipating heat, and improving the symmetry of the whole light source, strength and stability of mounting on the conductive circuit 30 board.

The first embodiment described above is relatively easy to implement. While the second embodiment, the spectral tuning is an extremely long and complex process, and the specific tuning process is as shown later. However, this unified driving method obviously has obvious advantages that it is not necessary to configure different driving currents for different luminaries, and it is not necessary to add the control conductive circuit 30, and it is only necessary to supply power according to the corresponding currents. Therefore, the structure is simplified, the volume is further reduced, the application is simpler, more convenient and more flexible, and the cost is lower. This is the preferred conductive trace 30 connection scheme of the present invention.

Further, in the embodiment of the present invention, a color temperature adjusting chip may be further added on the substrate 10, and the color temperature adjusting chip is independent from the light emitting structure 20, and accordingly, the conductive circuit 30 is properly adjusted, so that the color temperature adjusting chip can independently emit light or extinguish, and further, by controlling the light emitting state of the color temperature adjusting chip, the color temperature adjusting chip is mixed with the near natural light emitted by the light emitting structure 20 to adjust the color temperature.

Regarding the optical performance of the light source, it should be mentioned that, under the condition that both the spectrum and the optical parameters of the light source meet the requirements, the relative spectral power of the 640-700nm red light is significantly improved, which is difficult to be realized in the existing near-natural light source, and mainly shows that the improvement of the red light, the whole spectrum shape and other optical parameters are difficult to be considered. This embodiment is achieved through a large amount of basic research and a continuous optimization process. As shown in FIG. 6, the relative spectral power of the red light with the wavelength of 680-690 nm is greater than 0.80; the relative spectral power of the red light with the wavelength of 622-680 nm is more than 0.60. As shown in fig. 9 and 14, the conventional near-natural light source tends to be significantly lowered in the wavelength band after 640 nm. The 640-700nm red light has excellent health care, physical therapy and beauty treatment effects. The light source is suitable for office and home illumination and special places which need high-proportion red light and are close to natural light for illumination.

Moreover, through the test of light sources with different color temperatures, when the color temperature of quasi-natural light is 2700K-3000K, the relative spectral power of the red light with the wavelength of 640-700nm is more than 0.70; when the color temperature of quasi-natural light is 4000K-4200K, the relative spectral power of red light with the wavelength of 640-700nm is more than 0.60; when the color temperature of quasi-natural light is 5500K-6000K, the relative spectral power of red light with the wavelength of 640-700nm is more than 0.50.

It should also be mentioned that in many low-blue LED light sources, the blue light ratio is difficult to be increased, and in the case of pulling down blue light, the blue light is more difficult to be increased, and the color rendering index R12 corresponding to the blue light is also difficult to be increased. According to the embodiment of the invention, on one hand, the blue light chip of 457.5nm-480nm is selected by breaking through the traditional convention (adopting the 450-455nm blue light chip), on the other hand, the development of the fluorescent film is dedicated, and the relative spectral power of the cyan light is obviously improved under the double-tube condition. Meanwhile, due to the improvement of cyan light, the improvement of the color rendering index R12 also contributes to inhibiting blue light and keeping higher color temperature to a certain extent. As shown in fig. 11, the relative spectral power of cyan light in the conventional near-natural light is lower than 0.3, and as shown in fig. 6 and 7, the relative spectral power of cyan light in this embodiment reaches 0.4 or more.

Referring to fig. 10 and 11, fig. 10 shows the spectrum of the white light emitter 21 in this embodiment, when the blue light chip with 457.5nm to 460nm is used, the relative spectral power of the cyan light is already above 0.5, when the blue light chip with 457.5nm to 480nm is used, the relative spectral power of the cyan light may be higher, and when the blue light chip with 452.5 nm to 455nm is used in fig. 11, the relative spectral power of the cyan light is only between 0.35 and 0.38.

Moreover, through the test of light sources with different color temperatures, when the color temperature of quasi-natural light is 2700K-3000K, the relative spectral power of cyan light in the 475-492nm waveband is more than 0.30; when the color temperature of the quasi-natural light is 4000K-4200K, the relative spectral power of the cyan light in the 475-492nm waveband is larger than 0.40; when the color temperature of quasi-natural light is 5500K-6000K, the relative spectral power of the cyan light in 475-492nm wave band is larger than 0.50.

Hereinafter, the optimization process of the low blue LED light source is briefly described.

The optimization process of the low-blue-light LED light source is divided into two processes, wherein one process is the optimization process aiming at different driving currents, and the other process is the optimization process aiming at the same driving current.

The optimization procedure for different drive currents comprises the following steps:

step S101, selecting a first light emitter, wherein the first light emitter is used for emitting white light;

step S102, optimizing the spectral distribution of the first light emitter, and optimizing the white light into first near-natural light;

step S103, determining a to-be-optimized waveband of the first near natural light according to the spectral distribution of the first near natural light and the spectral distribution of the natural light;

step S104, selecting a second luminophor according to the to-be-optimized wave band;

step S105, lighting the first luminous body and the second luminous body according to a preset luminous flux ratio of the first luminous body and the second luminous body;

and S106, optimizing the combined spectrum of the first luminous body and the second luminous body by adjusting the spectral distribution of the first luminous body and the second luminous body to obtain near-natural light.

The optimization process for the same drive current includes the following steps:

step S201, selecting a first light emitter, wherein the first light emitter is used for emitting white light;

step S202, optimizing the spectral distribution of the first light emitter, and optimizing the white light into first near-natural light;

step S203, determining a to-be-optimized waveband of the first near natural light according to the spectral distribution of the first near natural light and the spectral distribution of the natural light;

step S204, selecting a second luminophor according to the to-be-optimized wave band;

step S205, determining an initial luminous flux ratio of a first luminous body and a second luminous body;

step S206, optimizing the combined spectrum of the first luminous body and the second luminous body by adjusting the spectral distribution of the first luminous body and the second luminous body to obtain near natural light, wherein the driving currents of the first luminous body and the second luminous body are the same or the difference is in a preset range; wherein the adjustment of the spectral distribution of the first and second light emitters comprises at least an adjustment of the drive current.

It can be seen that the two optimization processes are mainly distinguished from the sixth step. In the second optimization process, near-natural light is finally obtained under the condition of the same driving current. This difference directly results in a large difference in the ease of the two optimization processes.

In the first five steps of the two optimization processes, firstly, the white light emitter is selected as the first light emitter as the main light emitter, and the wavelength range of the main light emitter is large and at least includes the 400-640nm band. The white light is optimized to be the first near-natural light, so that the white light is as close to the natural light as possible, and the relative spectral power of the white light is improved as much as possible in the optimization process, so that the type selection of the subsequent second light-emitting body is simpler, the optimization of the combined spectrum of the two light-emitting bodies is facilitated, and the optimized first near-natural light has the characteristics described above.

With reference to the first near natural light spectrum, it can be determined that 640-700nm red light needs to be supplemented. Further selecting a second light-emitting body which emits red light, wherein the second light-emitting body is used for being combined with the first light-emitting body to obtain illumination light rays which are closer to natural light; on the other hand, by supplementing red light, blue light can be reduced, and this conclusion can be confirmed by the previous basic research, the contents of which will be described later in detail.

Further, according to the spectrum curve of the first near natural light and through a large number of combined spectrum debugging experiments, the central wavelength of the second light-emitting body is determined to be preferably 690 +/-5 nm, so that the relative spectral power of the red light with the wavelength of 640-700nm can be close to the spectrum of the natural light as much as possible after the second light-emitting body is combined with the spectrum of the first near natural light.

In the fifth step, after the first illuminant and the second illuminant are determined, a reasonable luminous flux ratio, namely, the ratio of the luminous flux of the first illuminant and the light radiation quantity of the second illuminant, which is referred to as an "initial luminous flux ratio" herein, can be selected according to the spectrums of the two illuminants, and the initial luminous flux ratio can be preliminarily determined to be feasible within the range of 2-10:1 according to the wavelength ranges and the spectrum characteristics of the first near-natural light and the red light. Further, it can be further determined through experiments that the initial luminous flux ratio is in the range of 2-5:1, and then the process of optimizing the combined spectrum is performed by lighting a corresponding number of the first luminous bodies and a corresponding number of the second luminous bodies according to the preset initial luminous flux ratio.

The sixth step in the first optimization method:

the luminous flux of the first luminous body and the light radiation quantity of the second luminous body are adjusted mainly by adjusting the driving currents of the first luminous body and the second luminous body. Firstly, adjusting the driving currents of the first luminous body and the second luminous body, and monitoring the combined spectrum in real time until the relative spectral power of each waveband of the combined spectrum reaches a preset range. And then detecting the optical parameters of the combined spectrum, and if the optical parameters are unqualified, continuously adjusting the driving current until the optical parameters reach a preset range, and at the moment, confirming that the near-natural light is obtained. Finally, the actual ratio of the luminous flux of the first luminous body to the light radiation amount of the second luminous body, the actual driving currents of the first luminous body and the second luminous body and the corresponding optical parameters are recorded.

Preferably, corresponding spectrogram of near natural light, chromaticity diagram, other electrical parameters, light effect parameters, red, green and blue ratio parameters and other information are further stored. Of course, various optical parameters of the first and second emitters are preserved when selected, such as wavelength range, center wavelength, model, specification, current rating, light efficiency, etc.

When the driving current can not be adjusted repeatedly, two options can be provided, wherein one option is to adjust the formula and/or the concentration and/or the thickness of the fluorescent film; and secondly, adjusting the central wavelength of the second light emitter or adding a third light emitter with the central wavelength different from that of the second light emitter. According to the basic research in the previous stage, the optimized relation between the fluorescent film and the spectrum and the optimized relation between the red light and the spectrum can be obtained, and under the guidance of a corresponding theory, a proper mode can be selected to adjust the optimization scheme.

Specifically, the first method specifically includes: firstly, adjusting the formula of the fluorescent film to adjust the relative spectral power and the color rendering index of each wave band; the formula refers to the components and the proportion of the fluorescent powder material in the fluorescent film. Secondly, adjusting the concentration of the fluorescent film to adjust the color rendering index and the color temperature; the concentration refers to the content of the fluorescent powder in the fluorescent film under the condition of determined formula; thirdly, adjusting the thickness of the fluorescent film to adjust the color temperature.

In the second mode, the center wavelength of the second light emitter is adjusted or a third light emitter having a center wavelength different from that of the second light emitter is added, and the second light emitter is combined with the first light emitter to perform optimization. By conducting a number of basic studies, it can be determined that the second luminophore also has a significant effect on the combined spectral distribution and light parameter.

A sixth step in the second optimization method:

not only near-natural light needs to be obtained, but also the driving current needs to be consistent, or slightly different within an allowable small range, so that in actual work, when the same current is adopted for driving, the obvious change of the spectrum and the optical parameters cannot be caused. The sixth step of the second optimization method is described in detail as follows:

the sixth step S206 includes the following substeps:

s21: adjusting the driving currents of the first light emitter and the second light emitter, monitoring the combined spectrum in real time, and performing step S22 when the relative spectral power of the combined spectrum reaches a predetermined range, otherwise, repeating step S21;

s22: detecting the optical parameters of the combined spectrum, and performing step S23 when the optical parameters reach a preset range, otherwise, returning to step S21;

s23: adjusting the driving current of the first light emitter and/or the second light emitter to enable the two driving currents to be consistent;

s24: adjusting the luminous flux of the first light emitter and/or the light radiation quantity of the second light emitter according to the change of the relative spectral power of the combined spectrum, monitoring the combined spectrum in real time, and performing step S25 when the relative spectral power of the combined spectrum meets a preset range, or performing step S21;

s25: detecting the optical parameters of the combined spectrum, confirming that near natural light is obtained when the optical parameters reach a preset range, and performing step S26, otherwise, performing step S21;

s26: recording the actual driving currents of the first luminous body and the second luminous body, the actual proportion of the luminous flux of the first luminous body and the light radiation quantity of the second luminous body and the optical parameters of the near-natural light.

The above steps disclose a specific implementation process of step S206, first, the first light emitter and the second light emitter in corresponding numbers are lit according to the initial luminous flux ratio, the luminous flux of the first light emitter and the light radiation amount of the second light emitter are respectively adjusted by adjusting the driving current, at this time, the combined spectrum changes, after a plurality of times of debugging, the shape of the combined spectrum (i.e. the relative spectral power of each band) and the natural light approach to the allowable range, and at this time, the spectrum is confirmed to meet the requirements.

On the basis, the optical parameters are checked, if the optical parameters meet the preset range, the near-natural light is determined to be obtained, and if the optical parameters do not meet the preset range, the driving current is repeatedly adjusted to enable the optical parameters to meet the requirements.

After both the spectral and optical parameters meet the requirements, the driving currents are usually inconsistent, and subsequent adjustments are required to achieve uniform driving, which is lengthy and complicated. Step S23 is first performed: adjusting the driving current of the first light emitter and/or the second light emitter to enable the two driving currents to be consistent; when the currents are uniform, the combined spectrum must change. Then, step S24 is performed: and further adjusting the luminous flux of the first luminous body and the light radiation quantity of the second luminous body according to the change of the relative spectral power of the combined spectrum, monitoring the combined spectrum in real time, wherein the adjusted luminous flux or light radiation quantity is the luminous flux or light radiation quantity, detecting the optical parameters of the combined spectrum when the relative spectral power of the combined spectrum conforms to a preset range, and confirming that the near-natural light is obtained when the optical parameters reach the preset range. This is an ideal situation.

However, after adjusting the luminous flux, it is difficult to conform the relative spectral power to a predetermined range, and the optical parameters are also liable to fluctuate. Therefore, steps S21 to S25 are repeated to readjust the driving current (in this case, fine tuning is required) so that the relative spectral power and the optical parameters meet the predetermined range. Since the step of adjusting the driving current to be consistent is performed every time in the process of repeating the steps S21-S25, the current will gradually tend to be consistent in a plurality of adjustments, and the adjustment range for the luminous flux and the current will gradually decrease, and finally, near-natural light meeting the requirements under the condition that the driving current is consistent will be obtained.

Further, in the optimization process of the combined spectrum, there may be the following cases: after the driving current is adjusted for many times, the spectrum or optical parameter still cannot meet the requirement, and at this time, step S20 is performed:

adjusting the formula and/or concentration and/or thickness of the fluorescent film, and then performing step S21;

or,

adjusting the center wavelength of the second light emitter, and then performing step S21;

or,

a third emitter having a center wavelength different from the center wavelength of the second emitter is added and then step S21 is performed.

Also, based on the previous basic research (described later), the relationship between the fluorescent film and the spectrum optimization and the relationship between the red light and the spectrum optimization can be obtained, and under the guidance of the corresponding theory, the optimization scheme can be adjusted in a suitable manner.

In the actual optimization process, the adjustment of the phosphor film, the adjustment of the red light emitter 22 and the adjustment of the driving current and the luminous flux are repeated for many times, so that the final result can be obtained.

Finally, after the commissioning is finished, corresponding parameters need to be recorded, and the data is used for providing necessary information for the production and manufacturing of the light source.

After the optimization process, the white light emitter 21 and the red light emitter 22 are determined, and the actual ratio of the luminous flux of the white light emitter 21 to the light radiation amount of the red light emitter 22 is 2-3:1, and the current is 20-100mA, preferably 60 mA. Preferably, 1-4 white light emitters 21 and 1-2 red light emitters 22 are connected in series to form a light source, and the power of a single light source is about 0.5W. In the case where the color temperature is different, the actual data is slightly different. Corresponding data of several color temperatures can be determined as required to manufacture corresponding products. For example, lamps used in offices are generally selected as products having a higher color temperature, lamps used in homes are generally selected as products having a lower color temperature.

The spectrum and optical parameters of the current LED light source are not easy to be close to natural light, but the current LED light source is difficult to be driven by the same current. Different chips are combined together, if certain light is to be obtained, the current needs to be adjusted to meet the preset requirement, the driving currents of the chips are usually different, and if uniform driving, spectrum shape and light parameters meet the requirement, the finding of the types of white light and red light and the balance point of luminous flux and current is the biggest technical difficulty. The LED lamp is embodied on a light source product, namely, the LED lamp can emit near natural light by the simple arrangement of the two-foot drive matched with the light-emitting structure 20, and the illumination quality and the applicability are greatly improved.

The basic research involved in the embodiments of the present invention is as follows:

basic research is as follows: research on near-natural light spectrum.

Natural light in nature comes from solar luminescence, and the natural light is different in four seasons or even different periods of a day, and mainly shows the difference of spectrum and color temperature. The sunlight in early spring morning makes people feel comfortable, and in the embodiment of the invention, the sunlight spectrum in early spring morning can be selected as a reference, and the relative spectral power and the optical parameters of the near-natural light are set. Of course, this is a preferred embodiment, and other times of natural light can be used as a measure to set the corresponding parameter requirements for near natural light. The optimization method provided by the embodiment of the invention is suitable for natural light at various times, and only needs to slightly adjust certain parameters.

Basic research two: spectral shape versus phosphor film formulation. Research shows that the fluorescent film formula has a large relation with the corresponding spectrum shape; changing the proportion of one powder in the formula can directly change the relative spectral power of the corresponding wavelength band, and the larger the proportion is, the larger the relative spectral power of the corresponding wavelength is, and the color rendering index can be changed at the same time. Based on the above, when the spectrum shape and the color rendering index are not satisfactory, the proportion of certain powder can be increased or decreased according to the specific wave band, or the color coordinate parameter of certain powder can be changed.

Basic research three: spectral shape versus phosphor film concentration. Research shows that under the condition of unchanged formula, the higher the concentration of the fluorescent powder, the higher the relative spectral power of 490-700nm is, until the relative spectral power of blue light is exceeded, the color temperature is reduced along with the reduction of the relative spectral power of the blue light, the light color is changed, and the color rendering index is changed along with the change of the color temperature. Based on this, the color rendering index and the color temperature can be changed by changing the density. However, when the concentration is adjusted to a certain state and the color temperature is not in accordance with the requirement, the formulation ratio of each powder in the fluorescent film is also changed to ensure that the light color of different color temperatures conforms to the international standard (i.e. the color coordinate of the standard color temperature).

And fourthly, basic research: spectral shape and color temperature versus fluorescent film thickness. Studies have shown that the greater the thickness of the phosphor film, the lower the color temperature, with the same formulation and concentration. Based on this, when the colour temperature does not satisfy the requirement, can adjust the colour temperature through changing thickness, and it is little to other parameters influence.

Basic research five: the drive current is related to the spectral shape change. Research shows that the relation between the driving current and the change of the spectral shape is as follows: (1) increasing the drive current of either chip (blue or red) will change its corresponding spectral power; (2) the optimal spectrum optimization result can be obtained by adjusting the driving currents of the two chips; (3) increasing the drive current of one of the chips to increase its luminous flux suppresses the relative spectrum of the other chip. Based on this, the combined spectrum can be adjusted by adjusting the driving current, and the blue light can be suppressed, that is, the blue light can be suppressed by adding a red light chip.

And sixthly, basic research: red chip specification versus light radiation amount. Research shows that the relationship between the red chip specification and the light radiation quantity is as follows: under the condition of constant driving current, generally, as the chip specification increases, the light radiation quantity of the chip increases. Based on the above, the specification of the red light chip with the optimal selective valence ratio can be determined according to the final actual luminous flux ratio. The optimal cost performance means that the specification is as small as possible, the welding requirements can be met, the lighting effect is as high as possible, the reliability is good, and meanwhile, the price is considered.

The invention also carries out a seventh basic research: the relationship between the luminous flux of the white light luminous body and the near-natural light spectrum optimization is researched on the basis of eight: the light radiation quantity of the red light chip is in optimized relation with the spectrum of the near natural light. The seventh basic research is carried out to find the specification of the blue light chip with the best (cost performance), the formula of the fluorescent film, the concentration and the thickness; searching a blue light chip and a fluorescent film which enable the light emitted by the first light emitter to be close to the natural spectrum as much as possible; the basic research eight aims to find the specification of the red chip with the best (cost performance), find the best value of the light radiation quantity (specification) of the red chip for inhibiting the blue light relative spectrum, and find the red chip for enabling the combined spectrum to be close to the natural spectrum as far as possible.

The basic research is a main theoretical basis for selecting the blue light chip, the fluorescent film and the red light chip and is also a theoretical basis for continuously optimizing parameters in the spectrum debugging process.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A low blue light LED light source is characterized by comprising a substrate provided with a conducting circuit and at least one group of light-emitting structures which are arranged on the substrate and connected with the conducting circuit; the light-emitting structure comprises a white light-emitting body and a red light-emitting body, the white light-emitting body comprises a blue light chip and an optical conversion layer arranged outside the blue light chip, the red light-emitting body comprises a red light chip, white light emitted by the white light-emitting body and red light emitted by the red light-emitting body are mixed to obtain near-natural light, and the red light is used for compensating a red light part of the white light relative to the loss of a natural spectrum; the ratio of the total luminous flux of the white light luminophor to the total light radiation quantity of the red light luminophor is 2-10: 1; the blue light color ratio in the near natural light is less than 5.7%; the relative spectral power of blue light in the near-natural light is less than 0.75; the relative spectral power of the red light in the near natural light is more than 0.60.

2. The low-blue LED light source of claim 1, wherein the near-natural light has a color temperature in the range of 2500K to 6500K, a color tolerance of less than 5, a color rendering index Ra of greater than 95, a color rendering index of R9 of greater than 90, and a color rendering index of R12 of greater than 80; at color temperatures above 4000K, the relative spectral power of the blue light remains less than 0.75 and the blue color ratio remains less than 5.7%.

3. The low blue LED light source of claim 1 wherein the relative spectral power of 440nm blue light in said near natural light is less than 0.65.

4. The low blue LED light source of claim 3,

when the color temperature of the near-natural light is 2700K-3000K, the relative spectral power of the 440nm blue light is lower than 0.50;

5. The low blue LED light source of claim 1,

the relative spectral power of orange light in the near natural light is more than 0.55;

6. The low-blue LED light source of claim 1, wherein the blue light chip has a wavelength range of 450 and 480 nm; the wavelength of the red light chip is 640-700 nm; in one group of light-emitting structures, the number ratio of the blue light chips to the red light chips is 1-8: 1; the blue light chip and the red light chip are arranged on the substrate in an inverted or normal mode.

7. The low-blue LED light source of claim 1, wherein said optical conversion layer is a fluorescent layer or a phosphorescent layer, said fluorescent layer comprises a colloid and a phosphor mixed inside said colloid, said phosphor comprises red, green and yellow-green powders;

the color coordinate of the red pink is X: 0.660 to 0.716, Y: 0.340-0.286;

the color coordinate of the green powder is X: 0.064-0.081, Y: 0.488-0.507;

the concentration of the fluorescent layer is 17% -43%;

8. The low-blue LED light source of claim 1, wherein the conductive trace comprises a set of positive and negative electrodes, and the white light emitters and the red light emitters are connected in series and electrically connected to the set of positive and negative electrodes and driven uniformly by the same driving current.

9. The low-blue LED light source of claim 1, wherein the conductive traces comprise at least two sets of anodes and cathodes, and the white light emitters and the red light emitters are electrically connected to the different sets of anodes and cathodes, respectively, and are driven by different driving currents, respectively.

10. A lighting device comprising the low blue LED light source of any one of claims 1 to 9.