CN107565006B

CN107565006B - LED light source with sunlight visible light part spectrum structure and lamp

Info

Publication number: CN107565006B
Application number: CN201710763486.8A
Authority: CN
Inventors: 陈雷; 费米; 陈杰; 何良锐; 田云飞; 刘衍芳; 张强
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2017-08-30
Filing date: 2017-08-30
Publication date: 2021-05-18
Anticipated expiration: 2037-08-30
Also published as: CN107565006A

Abstract

The invention discloses an LED device with a sunlight visible light spectrum structure and a light source, wherein the LED device comprises a blue LED chip or blue fluorescent powder, and cyan, red, green and orange spectrum components are mixed in an emission spectrum of the LED device by utilizing the cyan fluorescent powder, the green fluorescent powder, the orange fluorescent powder and the red fluorescent powder to obtain white light. Compared with the prior art, the invention has the following advantages: the solar energy light source has a solar light emission spectrum configuration, does not contain ultraviolet and infrared spectrum components, and is a healthy light source; the white light LED device is packaged by adopting a four-element or five-element color technical scheme, which is different from the traditional three-primary-color concept and the color binary technical scheme adopted by the early LED packaging, and emphasizes that the most important cyan light spectrum component with the wavelength range of 480-520nm in the solar spectrum needs to be added; not only meets the requirements of environmental protection, green and energy conservation, but also meets the requirements of human health.

Description

LED light source with sunlight visible light part spectrum structure and lamp

Technical Field

The invention belongs to the field of electronic information, in particular relates to a semiconductor photoelectric device, green illumination and information display, and particularly relates to a packaging method of a white light LED device with a spectrum configuration of emitting sunlight in a visible light range and a healthy light source manufactured by using the device.

Background

White LEDs, known as the fourth generation of green semiconductor lighting sources following incandescent, fluorescent and high-pressure gas discharge lamps, have the advantages of low operating voltage (2.6-3.2V), high energy efficiency, low energy consumption, low thermal radiation (reduced greenhouse effect), environmental friendliness (no mercury pollution), small size, and good shock resistance. Thus, once LED's have been introduced, they have gained rapid popularity, with penetration rates of up to 100% in the area of display backlights. Although semiconductor lighting has the obvious advantages of energy conservation and environmental protection, it is still a challenge to endow LEDs with green lighting health function.

In early days, white LEDs mainly used GaInN blue LED chips in combination with yttrium aluminum garnet (Y)₃Al₅O₁₂Ce) yellow fluorescent powder, but the white light LED not only has high color temperature, but also has low color rendering index. And then, a ternary color scheme is proposed, wherein a proper amount of fluorescent powder capable of emitting red light is added on the basis of the blue and yellow binary colors, or a tricolor scheme that an LED chip emits blue light and green and red fluorescent powders are matched is adopted. However, no matter the binary color or the ternary color white light, the proportion of blue light components in the spectrum is high, otherwise, the corresponding white light cannot be prepared. High blue light content can create a "bluing" hazard. The blue light has an inhibitory effect on melatonin, causes nerve excitation, causes sleep disorder, influences the spinor rhythm and a series of functional disorders, and reduces the immunity. Episcleral dysrhythmia often takes a longer time to observe.

With the popularity of LED illumination sources, one relatively easy to observe phenomenon is the dramatic increase in myopes. On one hand, the smart phone development enables the functions of mobile phone calling, video, reading, payment, shopping and the like to be more and more powerful, and for a large number of 'low-head' users, the users can feel that the vision is obviously reduced when using the mobile phone for a long time or working under an LED illumination light source for a long time; on the other hand, the ophthalmic vision outpatient service in hospitals, teenagers and children myopia patients are remarkably increased, the myopia degree is deepened, and the myopia patients develop towards low ages.

There are two main mechanisms for the harm of blue light to the human eye. First, blue photons are high in energy and can penetrate through crystalline lens to directly reach retina, so that retinal pigment epithelial cell atrophy is caused, macular degeneration is caused, and light-sensitive cell apoptosis causes visual deterioration and even blindness. (ii) a The lens absorbs part of the blue light and gradually becomes turbid to form cataract. The crystalline lens of children is clear and cannot effectively resist blue light, so that maculopathy and cataract are more easily caused. Second, due to the short wavelength of blue light, its focus is concentrated at the anterior retina rather than on the retina. To be clear, the eyeball must be under a taut tensile stress. The long-time work under the blue light causes visual fatigue, leads to myopia deepening, even diplopia, is easy to be serialized during reading, and the attention can not be concentrated, thus leading to the decline of learning and working efficiency.

In recent years, in order to reduce the blue light hazard, a full spectrum LED packaging scheme is proposed. The full-spectrum LED has the advantages that the emission wavelength range of the LED can cover all visible light regions, a small amount of ultraviolet light and infrared light exist, the spectrum is continuous, and the wave crests and wave troughs which are extremely out of order in proportion are avoided [ Liqi, Xinyi, Chinese lighting appliances, 2017, 3 and 12 ]. The ultraviolet component of the full spectrum contributes to environmental sterilization, while the infrared contributes to crop growth. However, the spectral composition analysis of the sun in natural light shows that the relatively more content of the spectral composition in the sunlight is 480-nm 560nm, while the relatively more lacking spectral composition in the current LED illumination light source is cyan light with 490-nm wave bottom and 480-530nm wave length range. In addition, because the photon energy of ultraviolet light is higher, the ultraviolet light has more harm to human eyes (typical case, the proportion of blind people in plateau area is higher than that in plain area); and the infrared ray does not respond because of the visual function of human eyes, and the infrared ray in the illuminating light source does not work but increases energy consumption and greenhouse effect. The solar spectrum inherently contains a certain ultraviolet spectral component, and it is not necessary to add an ultraviolet component to the illumination light source. If the environment sterilization is needed, the special sterilizing lamp can be turned on under the non-lighting condition, and the lighting and the sterilizing lamp are separately carried out.

In the art, different colors are usually designed into a two-dimensional plane palette of 360 degrees, and analysis of the solar spectrum shows that the solar intensity is in an asymmetric spectral configuration along with the wavelength distribution. The law of crystal symmetry (law of crystal symmetry) states that five axes and axes of symmetry higher than six are not possible in a crystal. For this reason, we consider that the best solution for encapsulating white LEDs in a solar spectrum configuration is to use the five-element color. Although the four-color scheme can approach the solar spectrum, the white light LED device with the asymmetric solar spectrum configuration is easier to package by adopting the five-color scheme in comparison. The invention provides a strategy for eliminating ultraviolet and infrared rays and reducing the spectral components of indigo based on the visual corresponding function of human eyes and the analysis of visible spectral components in solar spectrum, adopts a technical scheme of four-color or five-color, and encapsulates the white light LED health light source with the solar spectrum configuration by utilizing a blue light LED chip matched with cyan, green, red or orange fluorescent powder or utilizing an ultraviolet LED chip matched with blue, cyan, green, red or orange fluorescent powder.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an LED light source with a daylight visible light spectrum structure and a lamp.

The invention is realized by the following technical scheme: an LED light source having a daylight visible portion spectral structure, comprising: the LED light source comprises a blue LED chip or an ultraviolet LED chip, and cyan fluorescent powder, green fluorescent powder and red fluorescent powder are coated on the blue LED chip; and the ultraviolet LED chip is coated with blue fluorescent powder, cyan fluorescent powder, green fluorescent powder and red fluorescent powder.

As a further improvement to the above solution, the sunlight visible light portion refers to light in a wavelength range with a human eye visual response sensitivity of more than one thousandth, and the wavelength range is specifically 380-720 nm.

As a further improvement of the scheme, the LED light source has the emission spectrum components with the proportion of 0 percent of purple light, 0 percent of indigo light, 0 percent of blue light, 0 percent to 5 percent of green light, 9 percent to 17 percent of orange light, 17 percent to 30 percent, 18 percent to 29 percent, 7 percent to 13 percent, 11 percent to 19 percent and 16 percent to 26 percent; the wavelength of purple light is 380-420nm, the wavelength of indigo light is 420-440nm, the wavelength of blue light is 440-480nm), the wavelength of cyan light is 480-520nm, the wavelength of green light is 520-560nm, the wavelength of yellow light is 560-580nm, the wavelength of orange light is 580-620nm, and the wavelength of red light is 620-720 nm.

As a further improvement to the above scheme, the emission wavelength of the blue LED chip is 440-480nm, the emission wavelength of the cyan phosphor is 480-520nm, the peak emission wavelength of the green phosphor is 520-560nm, and the peak emission wavelength of the red phosphor is 620-660 nm.

As a further improvement to the above scheme, the mass ratio of the cyan phosphor, the green phosphor and the red phosphor coated on the blue LED chip is: (0-90%), 0-40% and 0-20%; the mass ratio of the blue fluorescent powder, the cyan fluorescent powder, the green fluorescent powder and the red fluorescent powder coated on the purple LED chip is as follows: 0 to 50 percent, 0 to 90 percent, 0 to 40 percent, 0 to 20 percent.

As a further improvement to the scheme, the emission wavelength of the blue LED chip is 455nm, and the cyan fluorescent powder is selected from (Ba)_0.8Sr_0.2)₂SiO₄Eu or Ba₂SiO₄Eu, beta-SIALON: Eu with peak emission wavelength of 557nm is selected as the green fluorescent powder, and CaAlSiN is selected as the red fluorescent powder₃∶Eu。

As a further improvement to the scheme, the blue LED chip is further coated with orange fluorescent powder.

As a further improvement to the above scheme, the peak emission wavelength of the orange phosphor is 580-610 nm.

As a further improvement to the above scheme, the mass ratio of the cyan phosphor, the green phosphor, the orange phosphor and the red phosphor coated on the blue LED chip is: (0-85%), 0-45%, 0-30% and 0-15%; the mass ratio of blue fluorescent powder, cyan fluorescent powder, green fluorescent powder, orange fluorescent powder and red fluorescent powder coated on the purple LED chip is as follows: (0-50%), 0-85%, 0-45%, 0-30% and 0-15%.

As a further improvement to the scheme, the emission wavelength of the blue LED chip is 455nm or 445nm, and Sr with the peak emission wavelength of 500nm is selected as the cyan fluorescent powder₄Al₁₄O₂₅Eu, the orange fluorescent powder adopts (Sr) with the peak value emission wavelength of 600nm_0.8Ba_0.2)₃SiO₅Eu, the red fluorescent powder is CaAlSiN₃Eu or Sr₂Si₅N₈Eu, the peak emission wavelength of the green phosphor is 540nm or a peak emission wavelength of 557 nm.

The invention also provides an LED lamp, and the LED lamp uses any one of the LED light sources with the daylight visible light spectrum structure.

Compared with the prior art, the invention has the following advantages: the LED light source emission spectrum developed by the invention has a solar light emission spectrum configuration in a visible light range, does not contain ultraviolet and infrared components in full spectrum components, and is a healthy light source; the environment-friendly energy-saving eye mask can completely meet the requirements of human eye health, has biocompatibility of visual health, does not contain ultraviolet spectrum components, does not contain infrared spectrum with weak response under the illumination conditions of photopic vision and scotopic vision of human eyes, meets the requirements of environmental protection, greenness and energy conservation, and meets the requirements of human health; the white light LED device is packaged by adopting a four-element or five-element color technical scheme, namely, a unitary cyan is added on the basis of the traditional three primary colors of red R + green G + blue B, or a blue light + cyan light + yellow light + red light four-element color scheme is adopted, or a blue light + cyan light + green light + orange light + red light five-element color scheme is adopted, the technical scheme is obviously different from the traditional three primary color concept and the color binary color technical scheme adopted by the early LED package, and the cyan spectral components are emphasized to be added, because the most important spectral components in the solar spectrum are the cyan light with the wavelength range of 500-530nm, while the cyan spectral components with the wavelength range of 500-530nm are not proposed in the prior technical scheme; the LED light source disclosed by the invention has the emission spectrum components within the visible light range of the solar spectrum, but compared with the solar spectrum, the white light LED healthy light source developed by the invention does not contain or contains less blue-violet spectrum components of 400-440nm in the solar spectrum.

Drawings

FIG. 1 is a graph of the solar spectrum at various times throughout the day.

FIG. 2 is a graph of color coordinates and relative color temperature of solar spectra at various times throughout the day.

FIG. 3 is a graph of solar spectrum versus the photopic and scotopic vision curves of the human eye.

Figure 4 graph of emission spectrum versus solar spectrum for a white LED device encapsulated by a binary color scheme as in example 1.

Fig. 5 the binary color scheme in example 1 encapsulates the emission spectrum of a white LED device.

FIG. 6 is a comparison graph of the emission spectrum and the solar spectrum of a white light LED device packaged by using a 455nm blue light chip + β 557 green powder +1113 red powder three-color scheme.

FIG. 7 is a comparison graph of the emission spectrum and the solar spectrum of a white light LED device packaged by adopting a 455nm blue light chip +1222 green powder +1113 red powder ternary color scheme.

Fig. 8 is a comparison diagram of an emission spectrum and a solar spectrum of a white light LED device packaged by using a four-color scheme of 455nm blue chip + Ba512 green powder + β 557 green powder +1113 red powder.

Fig. 9 is a comparison graph of an emission spectrum and a solar spectrum of a white light LED device packaged by using a four-color scheme of 455nm blue chip + Ba505 green powder + β 557 green powder +1113 red powder.

FIG. 10 is a comparison graph of the emission spectrum and the solar spectrum of a white light LED device packaged by using a five-element color scheme of 455nm blue light chip + A500 cyan powder + beta 540 green powder +315 orange powder +1113 red powder.

Fig. 11 is a comparison graph of the emission spectrum and the solar spectrum of a white light LED device packaged by using a five-element color scheme of 455nm blue light chip + a500 cyan powder + β 557 green powder +315 orange powder +1113 red powder.

Fig. 12 is a comparison graph of the emission spectrum and the solar spectrum of a white light LED device packaged by using a 445nm blue light chip + a500 cyan powder + β 557 green powder +315 orange powder +1113 red powder quinary color scheme.

Fig. 13 is a comparison graph of the emission spectrum and the solar spectrum of a white LED device packaged by using a 445nm blue light chip + a500 cyan powder + β 557 green powder +315 orange powder +258 red powder quinary color scheme.

Fig. 14 is a comparison graph of a white LED device encapsulated by 365nm ultraviolet chip +3128 blue powder + Ba505 cyan powder +557 green powder +315 orange powder +1113 red powder and a solar spectrum.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

To enhance understanding and appreciation of the present invention, specific embodiments are as follows.

Example (one) -binary color technical scheme and its disadvantages

Adopting 3528 semi-finished product (with peak emission wavelength of 455nm) of LED chip obtained after die bonding and wire bonding of Guangzhou Jingzhou electronic corporation and Y produced by Guangdong Landa fluorescent material corporation₃Al₅O₁₅Ce (YAG: Ce) yellow fluorescent powder and AB transparent silica gel produced by Jiangxi Lutai science and technology Limited company for packaging the white light LED device. Uniformly mixing and degassing YAG and Ce fluorescent powder in transparent silica gel, dripping the mixture onto an LED chip support by using a dispenser, and packaging a white light LED device after vacuum baking, wherein the YAG and Ce fluorescent powder accounts for 13% of the transparent silica gel by mass. The HAAS2000 photoelectric test equipment produced by Hangzhou remote photoelectric information corporation is used for testing the optical and electrical performance of the LED device. And on 26 th of 5 months in 2017, collecting solar spectrums by using a USB4000 light ray spectrometer of American ocean optics corporation at different times all day, and comparing the collected solar spectrums with the spectrum of the packaged white light LED device.

Fig. 1 shows the solar spectra of 2017, 5, 26, 9:00, 11:00, 15:00 and 17:00, and fig. 2 shows the change of the color coordinates CIE (x, y) and correlated color temperature (Tc) with time. Table 1 gives specific values in their color coordinates, color rendering index, color temperature and spectrum. The relative intensities of the solar spectrum in different seasons of the year and at different times of the day are not the same as the spectral configuration, but are common in several respects. Firstly, the solar spectrum is an asymmetric spectrum along with the change of wavelength in the aspect of spectrum configuration; secondly, the blue light below 470nm is relatively enhanced and the red, green, yellow and blue light above 470nm is relatively weakened after the afternoon along with the change of time; third, the relatively high intensity in the solar spectrum is the spectral component with the wavelength range of 470-590nm, as indicated by the two parallel lines in FIG. 1. From the curve of the photopic vision and scotopic vision functions of human eyes, as shown in fig. 2, the region with relatively strong intensity in the solar spectrum basically covers the region with the relative sensitivity of photopic vision and scotopic vision of more than 0.6. This should be the sensitivity to solar light stimuli developed during the long-term evolution of humans.

Although the blue LED chip and the YAG/Ce yellow fluorescent powder can be used for packaging white light with relatively good photoelectric efficiency and chromaticity (an emission spectrum is shown in figure 5), compared with a solar spectrum (a spectrum is shown in figure 3), the blue and yellow binary color scheme is adopted for packaging a white LED device, wherein the emission spectrum mainly lacks cyan light (marked as phi) with the wave trough peak value of 490nm, and the blue-violet light (marked as phi) with the wavelength below 440nm is adopted. Blue-violet light with the wavelength of below 440nm has higher photon energy and great damage to eyes, so that under the condition of meeting the requirement of white light illumination, the part of light can be reduced as appropriate, but the loss of the part of light is cyan light with the wave trough of 490nm in the 480-530nm wavelength range, and the loss of the part of light is an important factor influencing the quality of a white light LED light source.

TABLE 1 color coordinates CIE (x, y), color rendering index (R) of the solar spectrum at various times throughout the day_i) Correlated color temperature (Tc), color tolerance (dC) and relative proportions of the different color spectra of red, orange, yellow, green, cyan, blue, indigo, violet after normalization

Example (two) -three-color technical scheme and its deficiency

And packaging the white light LED device by adopting a three-component color technical scheme. In this example, the green phosphor of beta-SIALON and Eu (beta 557 for short), SrSi₂O₂N₂Eu Green phosphor (1222 for short) and CaAlSiN₃Eu red fluorescent powder (1113 for short) is commercial powder; the LED chip and the packaging process used are the same as in the first embodiment. Firstly, adopting 455nm blue light chip, beta-SIALON with emission wavelength peak value of 557nm and Eu green fluorescent powder (beta 557 for short) and CaAlSiN with emission wavelength peak value of 650nm₃Eu red fluorescent powder (1113 for short), wherein the fluorescent powder accounts for 22 percent of the transparent silica gel by mass, and the dosage ratio of beta 557 to 1113 is 9: 1; secondly, adopting 455nm blue light chip + SrSi with 545nm emission wavelength peak value₂O₂N₂Eu green phosphor (1222 for short) and CaAlSiN with 650nm emission wavelength peak₃Eu red fluorescent powder in transparent silica gelThe mass percentage of the components is 22%, the dosage ratio of 1222 and 1113 is 9: 1, and the emission spectra of the packaged white light LED device are shown in figures 6 and 7 respectively. Compared with the solar spectrum, whether beta-SIALON: Eu with the emission wavelength peak value of 557nm or SrSi with the emission wavelength peak value of 545nm is adopted₂O₂N₂Eu green fluorescent powder, the main spectral components of the ternary white LED device are still cyan light with the wave length range of 480-fold and the wave trough of 530nm of 490 nm.

Example (III) -four-color technical solution success case

The LED packaging process adopted in this embodiment is the same as that of the second embodiment, but the emission wavelengths in this embodiment are 512nm and 505nm (Ba)_0.8Sr_0.2)₂SiO₄Eu (abbreviated as Ba512) and Ba₂SiO₄Eu (Ba 505 for short) cyan fluorescent powder is synthesized by the laboratory. (Ba)_0.8Sr_0.2)₂SiO₄Eu or Ba₂SiO₄Eu blue phosphor adopts oxide raw material containing Ba, Sr and Si in H₂/N₂Prepared by high-temperature solid-phase reaction in reducing atmosphere, and the synthesis process adopts the literature [ Lei Chen et al₂ and reaction temperature on phase transformation and Eu²⁺site occupation in Sr₂SiO₄∶Eu²⁺phosphor，Journal of Alloys and Compounds，2017，in press]In the method, all or part of Sr is replaced by Ba to obtain a target product. A four-color technical scheme is adopted to package a white light LED device, and the experimental scheme is as follows: (1) adopting 455nm blue light chip + Ba512 cyan fluorescent powder + beta 557 green powder +1113 red powder, wherein the fluorescent powder accounts for 25% of the transparent silica gel by mass percent, and the dosage ratio of B alpha 512, beta 557 and 1113 is 0.8823: 0.087: 0.031; (2) the 455nm blue light chip + Ba505 cyan phosphor + beta 557 green powder +1113 red powder is adopted, wherein the phosphor accounts for 25% of the transparent silica gel by mass, the dosage ratios of B alpha 505, beta 557 and 1113 are 0.6649: 0.2019: 0.1332, and the emission spectra of the packaged white light LED device are respectively shown in FIGS. 8 and 9. Approach of white light LED device emission spectrum and solar spectrum configuration packaged by adopting four-color technical schemeThe degree is far higher than that of the technical schemes of binary color and ternary color. However, in fig. 8, the emission spectrum of the packaged white LED device cannot cover the solar spectrum well due to the relatively long emission wavelength of the phosphor used in the emission of the cyan phosphor with an emission wavelength of 512 nm. Further, by adjusting the emission wavelength of the cyan fluorescent powder and using Ba505 to replace Ba512, the emission spectrum of the packaged white light LED device substantially tends to be consistent with the configuration of the solar spectrum, as shown in fig. 9. However, the technical solution of the four-color is not perfect, and the blue-light region is not completely covered, and the region has obvious depression from the viewpoint of spectral continuity.

Example (IV) -case of success of five-color technical solution

The LED packaging process adopted in this example is the same as that of the second example, but the emission wavelength peak value of this example is 500nm of cyan phosphor Sr₄Al₁₄O₂₅Eu (A500 for short) and orange fluorescent powder (Sr) with emission wavelength peak value of 600nm_0.8Ba_0.2)₃SiO₅Eu (315 for short) is synthesized by the laboratory. Sr₄Al₁₄O₂₅Eu cyan fluorescent powder in H₂/N₂Synthesized by high temperature solid phase reaction under reducing atmosphere, and the luminescent center Mn is synthesized by using the fluorescent material synthesis method reported in the Journal of Alloys and Compounds, 2014, 613(15), 312 and Materials Research Bulletin, 2014, 60, 604⁴⁺Is changed to Eu²⁺And synthesizing under a reducing atmosphere. Other materials and devices are commercially available.

In this embodiment, a five-color technical scheme is adopted to package a white LED device, and the experimental scheme is as follows: (1) adopting 455nm blue light chip + A500 cyan fluorescent powder + beta-SIALON: Eu green powder (beta 540 for short) +315+1113 red powder with the peak value of emission wavelength of 540nm, wherein the fluorescent powder accounts for 28 percent by mass in the transparent silica gel, and the mass ratio of A500: beta 540: 315: 1113 is 0.6958: 0.1465: 0.1113: 0.0464; (2) adopting 455nm blue light chip + A500 cyan fluorescent powder + beta 557 green powder +315+1113 red powder, wherein the fluorescent powder accounts for 28 percent of the transparent silica gel by mass, and the mass ratio of A500 to beta 557 to 315 to 1113 is 0.7557 to 0.1377 to0.0581: 0.0484; (3) an LED blue light chip (445) with the emission wavelength of 445nm, A500 green powder, beta 557, 315 and 1113 red powder are adopted, wherein the fluorescent powder accounts for 28 percent by mass in the transparent silica gel, and the mass ratio of A500 to beta 557 to 315 to 1113 is 0.7604 to 0.1351 to 0.0570 to 0.0475; (4) adopting an LED blue light chip (445 for short) with the emission wavelength of 445nm, A500 green powder, beta 557, 315 and red fluorescent powder Sr with the emission wavelength peak value of 633nm₂Si₅N₈: eu (258 for short), wherein the fluorescent powder accounts for 28 percent of the mass of the transparent silica gel, and the mass ratio of A500: beta 557: 315: 1113 is 0.7855: 0.1313: 0.0340: 0.0462.

The emission spectra of the white LED devices packaged by these four schemes are shown in fig. 10 to 13, respectively. The five-color spectrum in fig. 10 is substantially similar to that in fig. 11, and the american deficiency is the presence of a spectrum (c) valley. By replacing β 540 in fig. 10 with β 557, a white LED device having an emission spectrum in close agreement with the solar spectrum is packaged in fig. 11. The difference between fig. 10 and fig. 11 illustrates that the wavelength range of the green spectrum is very important for packaging high quality white LEDs.

In the above embodiment, the blue-violet spectrum in the region of (i) cannot be covered all the time. For this reason, we try to reduce the wavelength of the LED chip, and as shown in fig. 12, a blue chip with an emission wavelength of 445nm is used instead of the 455nm blue chip, resulting in a white LED device with a reduced emission spectrum coverage of region —. On this basis, 258 red powder having an emission wavelength peak of 633nm was used instead of 1113 red powder having an emission wavelength peak of 650nm, as shown in fig. 13, resulting in a decrease in coverage of the dark red region (r). In combination with the above comparative analysis, it can be known that each primary color has a significant influence on the light source quality of the white LED device in the multi-color LED device packaging application.

Example (five)

The LED packaging process used in this example is the same as in example (iv), but an ultraviolet LED chip with an emission wavelength of 365 is used. The blue phosphor Sr adopted in this example₃MgSi₂O₈Eu (3128) was synthesized by the laboratory in the same manner as in the Journal of Luminescence, 2016, 169, 733, and the other phosphors were prepared as in the above examples. This example adoptsAnd (3) sealing the white light LED device by using a five-color scheme, wherein 3128 blue fluorescent powder, Ba505 cyan fluorescent powder, 557 green fluorescent powder, 315 orange fluorescent powder and 1113 red fluorescent powder are used, the mass percentage of the fluorescent powder in the transparent silica gel is 20%, and the mass ratio of the fluorescent powder is 3128: Ba 505: 557: 315: 1113-0.1836: 0.4350: 0.2010: 0.1273: 0.0531. The emission spectrum of the packaged white LED device is shown in fig. 14, and its spectral configuration substantially coincides with the solar spectrum.

Example (six)

An LED lamp using the LED device in embodiment (three) or embodiment (four).

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. An LED light source having a daylight visible portion spectral structure, comprising: the LED light source comprises a blue LED chip or an ultraviolet LED chip, and cyan fluorescent powder, green fluorescent powder and red fluorescent powder are coated on the blue LED chip; the ultraviolet LED chip is coated with blue fluorescent powder, cyan fluorescent powder, green fluorescent powder, red fluorescent powder and orange fluorescent powder;

the blue LED chip is further coated with orange fluorescent powder, and the peak emission wavelength of the orange fluorescent powder is 580-610 nm;

the emission spectrum component proportion of the LED light source is that purple light: indigo light: blue light: cyan light: green light: yellow light: orange light: red light ═ 0: (0-5%): (9% -17%): (17% -30%): (18-29%): (7-13%): (11-19%): (16% -26%); the wavelength of purple light is 380-420nm, the wavelength of indigo light is 420-440nm, the wavelength of blue light is 440-480nm, the wavelength of cyan light is 480-520nm, the wavelength of green light is 520-560nm, the wavelength of yellow light is 560-580nm, the wavelength of orange light is 580-620nm, and the wavelength of red light is 620-720 nm.

2. The LED light source of claim 1 having a daylight visible portion spectral structure, wherein: the sunlight visible light part refers to light in a wavelength range with human visual response sensitivity of more than one thousandth, and the wavelength range is 380-720 nm.

3. The LED light source of claim 1 having a daylight visible portion spectral structure, wherein: the emission wavelength of the blue LED chip is 440-480nm, the emission wavelength of the cyan fluorescent powder is 480-520nm, the peak emission wavelength of the green fluorescent powder is 520-560nm, and the peak emission wavelength of the red fluorescent powder is 620-660 nm.

4. The LED light source of claim 1 having a daylight visible portion spectral structure, wherein: the emission wavelength of the blue LED chip is 455nm, and the cyan fluorescent powder is selected from (Ba)_0.8Sr_0.2)₂Si0₄Eu or Ba₂Si0₄Eu, wherein the green fluorescent powder adopts beta-SIALON with peak value emission wavelength of 557 nm: eu, the red fluorescent powder is CaA1SiN₃:Eu。

5. The LED light source of claim 1 having a daylight visible portion spectral structure, wherein: the emission wavelength of the blue LED chip is 455nm or 445nm, and the peak emission wavelength of the cyan fluorescent powder is 500nm Sr₄Al140₂₅Eu, wherein the orange fluorescent powder adopts (Sr) with the peak value emission wavelength of 600nm_0.8Ba_0.2)3Si0₅Eu, the red phosphor is CaA1SiN₃Eu or Sr₂Si₅N₈Eu, wherein the green fluorescent powder selects beta-SIALON with the peak value emission wavelength of 540nm or beta-SIALON with the peak value emission wavelength of 557 nm.

6. An LED lamp, characterized in that: the LED lamp uses the LED light source which has the spectrum structure of the visible light part of the sunlight as in any one of claims 1 to 5.