CN114284257A - Full-spectrum white light source capable of reducing spectral power smoothness of blue light peak wave - Google Patents

Abstract

The invention belongs to the technical field of LED light sources, and discloses a full-spectrum white light source for reducing the spectral power smoothness of blue light peak waves, which comprises the following components: the long-wave chip and the short-wave chip are arranged on the substrate, the wavelength range of the long-wave chip is 455-470nm, the wavelength range of the short-wave chip is 440-450 nm, and the long-wave chip and the short-wave chip are provided with a fluorescent glue mixture formed by baking and curing. The invention has the beneficial effects that: 1. the spectral power distribution is smooth, no obvious wave crest and wave trough exist, R1-R15 (except R9 and R12) are all larger than 95, and R9 and R12 are all larger than 90; the color rendering property is higher; 2. the effect of removing blue light and no purple light is realized, and the ratio of the optical power in the wave band range of 380 nm-500 nm to the optical power in the wave band range of 380nm-780nm of visible light is controlled to be less than 1 percent; 3. the service life is longer, and the production cost is not high.

Description

Full-spectrum white light source capable of reducing spectral power smoothness of blue light peak wave

Technical Field

The invention relates to the technical field of LED light sources, in particular to a full-spectrum white light source capable of reducing the spectral power of blue light peak waves and smoothing.

Background

There are three processes currently used to produce white LED light sources.

One is to produce white light using a mixture of red, green and blue light. Three chips of red, green and blue are packaged together based on tricolor light in colorimetry, the respective output proportions of the chips are controlled, and white light is obtained after mixing.

The second method is to coat phosphor on a blue wafer. The surface of a blue light wafer within the wavelength range of 450-470 nm is coated with rare earth garnet series fluorescent powder, the fluorescent powder can emit yellow light under the irradiation of blue light, and the yellow light and the blue light are mixed to form a white light LED.

The third method is to use purple light or ultraviolet light to excite three primary colors fluorescent powder or multiple fluorescent powders so as to obtain white light.

The white light LED light source manufactured by the three methods has the defects of low color rendering index, high-energy harmful blue light, harmful purple light and harmful ultraviolet light.

In the indexes of a light source, the low color rendering index can influence the color distinguishing capability of vision, so that an object can not present the real color of the object, the color distinguishing capability is reduced and declined if the object is used in the light source for a long time, the sensitivity of cone cells of human eyes is also reduced, the brain can concentrate more attention unintentionally when distinguishing objects, the eye fatigue is easily brought, the myopia is even caused, and serious vision problems such as color blindness, color weakness and the like and eye diseases are caused. The light radiation of harmful blue light with high energy in the 415-plus 455nm spectral range causes photochemical reactions, which lead to retinal damage; harmful blue light can inhibit melatonin secretion, destroy hormone secretion balance, and influence sleep quality. The white light source manufactured by purple light or ultraviolet light has invisible light harmful to human body, and the long-wave ultraviolet light is harmful to human body; the purple light and the ultraviolet light are expensive in price, and the manufacturing cost is high; the attenuation of the purple light and ultraviolet light wafers is relatively large, which causes the problem of short service life of the light source.

The contents of the "photobiohazard requirement" were increased according to the revision of the national standard GB7000.1-2015 in 2015: photochemical ultraviolet hazard of skin and eyes (200-; the 2016 european lighting organization sets forth a "human-oriented lighting" requirement; the lighting program of the U.S. department of energy in 2017 emphasizes the influence of light on human physiological health; and eight departments such as the education department of 8/30/8 in 2018 and the like have the notice requirements of issuing the comprehensive prevention and control implementation scheme of the myopia of the children and the teenagers, so that a brand-new LED light source meeting the full-spectrum technical requirements of the indoor healthy lighting design specifications is needed to be provided, and the use requirements of people are met.

Disclosure of Invention

The invention aims to overcome at least part of the defects of the prior art and provide a full-spectrum white light source which can reduce the spectral power of a blue peak wave and is smooth.

The technical scheme of the invention is as follows: the invention provides a full-spectrum white light source for reducing the spectral power smoothness of a blue peak wave, which comprises: the long-wave chip and the short-wave chip are arranged on the substrate, the wavelength range of the long-wave chip is 455-470nm, the wavelength range of the short-wave chip is 440-450 nm, and the long-wave chip and the short-wave chip are provided with a fluorescent glue mixture formed by baking and curing.

Further, the light source is used for emitting 2200K low-color temperature warm white light, the light power ratio of the long-wave wafer to the short-wave wafer is 1:10, the fluorescent glue mixture comprises first mixed fluorescent powder, and the first mixed fluorescent powder comprises the following fluorescent powder in parts by weight: blue 2 parts, green 6 parts, red 1 part and deep red 1 part.

Further, the light source is used for emitting warm white light with a color temperature of 2700K or 3000K, the light power ratio of the long wave wafer to the short wave wafer is 1:6, the fluorescent glue mixture comprises second mixed fluorescent powder, and the second mixed fluorescent powder comprises the following fluorescent powder in percentage by weight: blue 0.5 parts, green 8.8 parts, red 0.2 parts, and deep red 0.5 parts.

Further, the light source is used for emitting 3500K or 4000K color temperature daylight white light, the light power ratio of the long wave wafer to the short wave wafer is 1:4, the fluorescent glue mixture comprises third mixed fluorescent powder, and the third mixed fluorescent powder comprises the following fluorescent powder in parts by weight: blue 2 parts, green 5 parts, yellow 1.6 parts, red 0.4 part, and deep red 1 part.

Further, the light source is used for emitting a white light source with a color temperature of 5000K or 5500K, the light power ratio of the long-wave wafer to the short-wave wafer is 1:1, the fluorescent glue mixture comprises fourth mixed fluorescent powder, and the fourth mixed fluorescent powder comprises the following fluorescent powder in parts by weight: blue 0.6 parts, green 6.2 parts, yellow-green 1 part, yellow 1 part, red 0.4 part, and deep red 0.8 part.

Furthermore, the long wave wafer and the short wave wafer are arranged in the accommodating cavity, and the fluorescent glue mixture is injected into the accommodating cavity and then is cured and molded by baking.

Further, the light source also includes a positive support pad and a negative support pad.

Further, the index Ra is shown to be greater than 96.

Further, the light source has a color rendering index, CRI, of greater than 95.

Furthermore, the color rendering indexes R1, R2, R3, R4, R5, R6, R7, R8, R10, R11, R13, R14 and R15 of the light source are all larger than 95, and the color rendering indexes R9 and R12 are all larger than 90.

By adopting the scheme, the invention has the beneficial effects that: 1. the spectral power distribution is smooth, no obvious wave crest and wave trough exist, R1-R15 (except R9 and R12) are all larger than 95, and R9 and R12 are all larger than 90; the color rendering property is higher; 2. the effect of removing blue light and no purple light is realized, and the ratio of the optical power in the wave band range of 380 nm-500 nm to the optical power in the wave band range of 380nm-780nm of visible light is controlled to be less than 1 percent; 3. the service life is longer, and the production cost is not high.

Drawings

Fig. 1 is a schematic structural diagram of a first alternative embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a second alternative embodiment of the present invention.

Fig. 3 is a first schematic structural diagram of a third alternative embodiment of the present invention.

Fig. 4 is a second structural diagram of a third alternative embodiment of the present invention.

Detailed Description

The invention is described in detail below with reference to the figures and the specific embodiments.

The invention provides a full-spectrum white light source for reducing the spectral power smoothness of a blue peak wave, which comprises: the long-wave chip and the short-wave chip are arranged on the substrate, the wavelength range of the long-wave chip is 455-470nm, the wavelength range of the short-wave chip is 440-450 nm, a fluorescent glue mixture formed by baking and curing is arranged on the long-wave chip and the short-wave chip, and a layer of epoxy glue is additionally sealed outside the fluorescent glue according to the structure and production requirements in a direct-insert packaging mode.

Further, referring to fig. 1, as an alternative embodiment of the invention, the long wave wafer 1 and the short wave wafer 2 are disposed in the accommodating cavity 3, and the fluorescent glue mixture is injected into the accommodating cavity 3 and then baked, cured and formed. The light source further comprises an anode support bonding pad 5 and a cathode support bonding pad 6, the long-wave wafer 1 and the short-wave wafer 2 are bonded on the bonding pad inside the support through crystal glue, and then the long-wave wafer 1 and the short-wave wafer 2 are connected with the anode support bonding pad 5 and the cathode support bonding pad 6 through connecting gold wires 4 in a routing mode to form an electric loop. It should be noted that fig. 1 is only for convenience of showing a PLCC package type in the present invention, and does not represent an actual external dimension situation.

Similarly, referring to fig. 2, as another alternative embodiment of the present invention, the long wave wafers 12 and the short wave wafers 8 are disposed in the cup cavity formed by the dam 9 and the substrate, and the number and serial-parallel manner of the long wave wafers 12 and the short wave wafers 8 can be adjusted according to the requirement. And injecting the fluorescent glue mixture into a bowl-cup cavity formed by the dam enclosing body 9 and the substrate, and then baking, curing and forming. The light source further comprises a positive support bonding pad 10 and a negative support bonding pad 11, the long-wave wafer 12 and the short-wave wafer 8 are bonded on the bonding pad inside the support through solid crystal glue (in a chip forward packaging mode) or tin paste (in a chip flip packaging mode), and the chip forward packaging mode is connected with the long-wave wafer 12 and the short-wave wafer 8, the positive support bonding pad 10 and the negative support bonding pad 11 through connecting gold wires in a routing mode to form an electric loop; the chip flip-chip packaging mode is connected with the connecting body 12 through the PCB circuit pad, the long wave wafer 12, the short wave wafer 8, the positive electrode support bonding pad 10 and the negative electrode support bonding pad 11 form an electric loop. It should be noted that fig. 2 is only for convenience of showing a COB package type in the present invention, and does not represent the actual substrate and light-emitting surface shape and size and the internal chip and wire layout.

Similarly, referring to fig. 3 and 4, as another alternative embodiment of the invention, the long wave wafer 13 and the short wave wafer 14 are disposed in the accommodating cavity 15, and the fluorescent glue mixture is injected into the accommodating cavity 15, and then is baked, cured and formed, and is made into the outer encapsulant 19 through a glue filling process. The light source further comprises a negative support bonding pad 17 and a positive support bonding pad 18, the long wave wafer 13 and the short wave wafer 14 are bonded on the bonding pad inside the support through crystal glue, and then the long wave wafer 13 and the short wave wafer 14 are connected with the positive support bonding pad 17 and the negative support bonding pad 18 through connecting gold wires 16 in a routing mode to form an electric loop. It should be noted that fig. 3 and 4 are only for convenience of showing one type of in-line package in the present invention, and do not represent actual carrier size and internal chip and wire layout.

Further, as an optional embodiment of the present invention, the light source is configured to emit 2200K warm white light with a low color temperature, a ratio of optical powers of the long wave wafer and the short wave wafer is 1:10, the fluorescent glue mixture includes a first mixed phosphor, and the first mixed phosphor includes the following phosphors in parts by weight: blue 2 parts, green 6 parts, red 1 part and deep red 1 part. The light source of the invention accords with the design specification of indoor health lighting, has smooth spectral power distribution, high color rendering index (the color rendering index Ra is more than 96, the CRI is more than 95, R1-R15 (except R9 and R12) are more than 95, and R9 and R12 are more than 90), removes blue light and has no purple light, accords with the human circadian rhythm system, and is beneficial to improving the sleep quality.

Further, as an optional embodiment of the present invention, the light source is configured to emit warm white light with a color temperature of 2700K or 3000K, a ratio of optical power of the long wave wafer to that of the short wave wafer is 1:6, the fluorescent glue mixture includes a second mixed phosphor, and the second mixed phosphor includes the following phosphors in percentage by weight: blue 0.5 parts, green 8.8 parts, red 0.2 parts, and deep red 0.5 parts. The light source of the invention accords with the design specification of indoor health lighting, has smooth spectral power distribution, high color rendering index (the color rendering index Ra is more than 96, the CRI is more than 95, R1-R15 (except R9 and R12) are more than 95, and R9 and R12 are more than 90), removes blue light and has no purple light, accords with the human circadian rhythm system, and is beneficial to improving the sleep quality.

Further, as an optional embodiment of the present invention, the light source is configured to emit 3500K or 4000K color temperature daylight white light, a ratio of optical power of the long wave wafer to optical power of the short wave wafer is 1:4, the fluorescent glue mixture includes a third mixed fluorescent powder, and the third mixed fluorescent powder includes the following fluorescent powders in parts by weight: blue 2 parts, green 5 parts, yellow 1.6 parts, red 0.4 part, and deep red 1 part. The light source of the invention accords with the design specification of indoor health lighting, has smooth spectral power distribution, high color rendering index (the color rendering index Ra is more than 96, the CRI is more than 95, R1-R15 (except R9 and R12) are more than 95, and R9 and R12 are more than 90), removes blue light and has no purple light, accords with the human circadian rhythm system, and is beneficial to improving the sleep quality.

Further, as an optional embodiment of the present invention, the light source is configured to emit a white light source with a color temperature of 5000K or 5500K, a ratio of optical power of the long wave wafer to optical power of the short wave wafer is 1:1, the fluorescent glue mixture includes a fourth mixed fluorescent powder, and the fourth mixed fluorescent powder includes the following fluorescent powders in parts by weight: blue 0.6 parts, green 6.2 parts, yellow-green 1 part, yellow 1 part, red 0.4 part, and deep red 0.8 part. The light source of the invention accords with the design specification of indoor health lighting, has smooth spectral power distribution, high color rendering index (the color rendering index Ra is more than 96, the CRI is more than 95, R1-R15 (except R9 and R12) are more than 95, and R9 and R12 are more than 90), removes blue light and has no purple light, accords with the human circadian rhythm system, and is beneficial to improving the sleep quality.

In conclusion, the beneficial effects of the invention are as follows: 1. the spectral power distribution is smooth, no obvious wave crest and wave trough exist, R1-R15 (except R9 and R12) are all larger than 95, and R9 and R12 are all larger than 90; the color rendering property is higher; 2. the effect of removing blue light and no purple light is realized, and the ratio of the optical power in the wave band range of 380 nm-500 nm to the optical power in the wave band range of 380nm-780nm of visible light is controlled to be less than 1 percent; 3. the service life is longer, and the production cost is not high.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A full spectrum white light source for smoothing spectral power of a clipped blue peak, comprising: the long-wave chip and the short-wave chip are arranged on the substrate, the wavelength range of the long-wave chip is 455-470nm, the wavelength range of the short-wave chip is 440-450 nm, and the long-wave chip and the short-wave chip are provided with a fluorescent glue mixture formed by baking and curing.

2. The full-spectrum white light source capable of reducing the spectral power smoothness of the blue light peak wave as claimed in claim 1, wherein the light source is used for emitting 2200K warm white light with a low color temperature, the ratio of the optical power of the long wave wafer to the optical power of the short wave wafer is 1:10, the fluorescent glue mixture comprises a first mixed fluorescent powder, and the first mixed fluorescent powder comprises the following fluorescent powders in parts by weight: blue 2 parts, green 6 parts, red 1 part and deep red 1 part.

3. The full-spectrum white light source for reducing spectral power smoothness of a blue peak wave of claim 1, wherein the light source is configured to emit 2700K or 3000K warm white light, a ratio of optical power of the long wave wafer to the short wave wafer is 1:6, the phosphor-gel mixture includes a second mixed phosphor, and the second mixed phosphor includes the following phosphors in weight fraction: blue 0.5 parts, green 8.8 parts, red 0.2 parts, and deep red 0.5 parts.

4. The full-spectrum white light source capable of reducing the spectral power smoothness of the blue light peak wave of claim 1, wherein the light source is used for emitting 3500K or 4000K color temperature daylight white light, the light power ratio of the long wave wafer to the short wave wafer is 1:4, the fluorescent glue mixture comprises a third mixed fluorescent powder, and the third mixed fluorescent powder comprises the following fluorescent powders in parts by weight: blue 2 parts, green 5 parts, yellow 1.6 parts, red 0.4 part, and deep red 1 part.

5. The full-spectrum white light source for reducing the spectral power smoothness of the blue light peak wave of claim 1, wherein the light source is used for emitting a white light source with a color temperature of 5000K or 5500K, the light power ratio of the long wave wafer to the short wave wafer is 1:1, the fluorescent glue mixture comprises a fourth mixed fluorescent powder, and the fourth mixed fluorescent powder comprises the following fluorescent powders in parts by weight: blue 0.6 parts, green 6.2 parts, yellow-green 1 part, yellow 1 part, red 0.4 part, and deep red 0.8 part.

6. The full-spectrum white light source for reducing the spectral power smoothness of the blue light peak according to any one of claims 1 to 5, wherein the long wave wafer and the short wave wafer are disposed in a containing cavity, and the fluorescent glue mixture is injected into the containing cavity and then is baked, cured and molded.

7. The full spectrum white light source for clipping blue peak spectral power smoothing of claim 6, further comprising a positive mount pad and a negative mount pad.

8. The full-spectrum white light source for reducing spectral power smoothness of blue light peaks as claimed in any one of claims 1 to 5, wherein color rendering index Ra is greater than 96.

9. The full spectrum white light source for clipping blue peak spectral power smoothing of claim 8, wherein the light source has a color rendering index CRI greater than 95.

10. The full spectrum white light source with blue clipped spectral power smoothing of claim 9, wherein the color rendering indices R1, R2, R3, R4, R5, R6, R7, R8, R10, R11, R13, R14, R15 are all greater than 95 and the color rendering indices R9, R12 are all greater than 90.

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