KR102445091B1 - LED lighting apparatus with antibacterial and sterilizing function - Google Patents

Abstract

The present invention relates to a white LED lighting having an antibacterial and sterilization function. Specifically, the present invention relates to the LED lighting having the antibacterial and sterilization function that emits a wavelength of blue light close to ultraviolet rays to emit a light that emits a color close to a white color that is suitable for livelihood while having the antibacterial function. Therefore, the present invention is capable of having an advantage of providing a sterilization/antibacterial function at the same time.

Description

LED lighting apparatus with antibacterial and sterilizing function

The present invention relates to an LED lighting having an antibacterial and sterilizing function, and more specifically, having an antibacterial and sterilizing function by emitting a wavelength of blue light close to ultraviolet light and emitting light that emits a color close to white suitable for life while having an antibacterial function. It is about LED lighting.

In a situation where the risk of infection in group life has increased due to the pandemic of Corona 19 (COVID-19) that broke out in 2020, use lighting that has a sterilization or antibacterial function while having a lighting function similar to that of general lighting as an indoor lighting. There is a need to reduce the risk.

In particular, when these lights are used in military bases, hospitals, commercial facilities (elevators, toilets, kitchens, nursing rooms, cooking rooms), sports facilities, and other places that require sanitation, they can be sterilized in spaces where people can be crowded. It can lower the risk of infection.

However, in general, lighting having a sterilization function emits a short wavelength less than the UV region, and light close to UV has a blue color, so it is not suitable for use as lighting in daily life.

Therefore, there is a demand for lighting having a sterilization function while having a color similar to that of living lighting.

Registered Patent Publication No. 10-2266703 (2021.06.18.)

An object of the present invention is to provide an antibacterial LED assembly capable of simultaneously expressing a sterilization function by emitting light having a sterilization effect of a short wavelength while emitting light of a color similar to that of general lighting.

In order to solve the above problems, the present invention provides an antibacterial LED assembly including a first LED element having a center wavelength of 400 to 410 nm and a second LED element having a center wavelength of 585 to 595 nm.

In a preferred embodiment of the present invention, the ratio of the full width at half maximum at the center wavelength of the first LED element to the half maximum width at the center wavelength of the second LED element may be 1:1.6 to 1:3.0.

In a preferred embodiment of the present invention, the ratio of the peak intensity at the center wavelength of the first LED device to the peak intensity at the center wavelength of the second LED device may be 1:1.2 to 1:1.5.

In a preferred embodiment of the present invention, the first LED device may have a full width at half maximum of a central wavelength of 18 nm or less.

In a preferred embodiment of the present invention, the antibacterial LED assembly may include a wavelength conversion filter for changing the wavelength band of the LED light source in addition to the region through which light is transmitted from the LED element.

The wavelength conversion filter may have a structure in which three or more metal oxide layers having different interlayer refractive indices are alternately stacked.

In a preferred embodiment of the present invention, the wavelength conversion filter has a first layer having a refractive index of 1.2 to 1.6, a second layer having a refractive index of 1.5 to 1.8, and a third layer having a refractive index of 1.6 to 2.1 as a first layer, a first layer It has a structure that is stacked alternately in the order of 2nd and 3rd layers,

The following conditional expression 1) may be satisfied.

1) n1<n2<n3

In Conditional Expression 1), n1 is the refractive index of the first layer, n2 is the refractive index of the second layer, and n3 is the refractive index of the third layer.

In a preferred embodiment of the present invention, the first layer may include SiO ₂ , the second layer may include ZnO, and the third layer may include Al ₂ O ₃ .

In a preferred embodiment of the present invention, the wavelength conversion filter may be one in which the first layer, the second layer, and the third layer are alternately stacked 3 to 10 times in this order.

In a preferred embodiment of the present invention, the wavelength conversion filter may satisfy the following conditional expression 2).

2) 0.7≤A/B≤1.0

In condition 2), A represents the illuminance measured at a distance of 1 m of the antibacterial LED assembly having the wavelength conversion filter, and B represents the illuminance measured at a distance of 1 m of the same antibacterial LED assembly without the wavelength conversion filter.

Since the antibacterial LED according to the present invention emits light of a color similar to that of general lighting, it can be used as a living lighting, but since it emits short-wavelength blue light having a sterilization effect, it has the advantage of providing a sterilization/antibacterial function at the same time.

1 is a view schematically showing the principle that a sterilization function is expressed by short wavelength light of 405 nm.
2 is a photograph taken of a conventional antibacterial light and a conventional antibacterial LED assembly according to the prior art.
Figure 3A is a photograph taken of the state of the antibacterial lamp according to the prior art.
Figure 3B is a photograph taken of the surrounding state when the antibacterial lamp according to the prior art is turned on.
Figure 4A is a photograph taken of the appearance of the antibacterial lamp according to a preferred embodiment of the present invention.
Figure 4B is a photograph taken when the antibacterial lamp is turned on according to a preferred embodiment of the present invention.
5A to 5F are photographs of LED lighting having antibacterial and sterilizing functions applied by arranging LED elements in various shapes.

Hereinafter, the configuration and effects of the present invention will be described in detail with reference to specific embodiments of the present invention.

As described above, the conventional antibacterial lamp is made of light of a short wavelength, so it is suitable for use in a sterilization device, but is unsuitable for use as a general lighting. This fact can be confirmed with reference to FIG. 2 or FIG. 3B. Referring to FIGS. 2 and 3B , it can be seen that the color of the illumination is unsuitable for use as illumination because the light of the illumination is blue that is too close to ultraviolet light.

In order to solve this problem, in the present invention, an antibacterial LED assembly including a first LED element having a center wavelength of 400 to 410 nm and a second LED element having a center wavelength of 585 to 595 nm was devised to solve this problem. .

The antibacterial LED assembly according to the present invention can exhibit sterilization and antibacterial effects by adopting a first LED element having a center wavelength of 400 to 410 nm, but by including a second LED element having a center wavelength of 585 to 595 nm at the same time by a complementary color effect Like general lighting, it can emit light close to white, so it has a color suitable for use in everyday life.

4A and 4B, the effect of the antibacterial LED assembly of the present invention can be confirmed. Figure 4A is a photograph of a state in which the lighting adopting the antibacterial LED assembly according to the preferred embodiment of the present invention is turned on.

Unlike the case where the conventional sterilization lamp is used in FIG. 3B, when the indoor atmosphere becomes blue, the appearance of turning on the lighting adopting the antibacterial LED assembly according to the preferred embodiment of the present invention emits white light that is not significantly different from that using the general lighting. can be checked

There is a substance called porphyrin in the cells of bacteria, which most effectively absorbs light with a wavelength of about 405 nm. Referring to FIG. 1 , it can be seen that the light absorption spectrum of porphyrin has a peak near 405 nm. At this time, active oxygen is generated by light absorption, and this active oxygen can suppress bacterial growth, thereby exhibiting a sterilizing effect.

In addition, since the antibacterial LED assembly according to the present invention is provided with the second LED element emitting light in the 585 to 595 nm region, it is possible to emit a color close to white due to the complementary color effect. In the region of 585 to 595 nm, yellow light is emitted. Since a blue light source having a short wavelength and a yellow light source having a relatively long wavelength are mixed, a natural color can be emitted.

In a preferred embodiment of the present invention, the ratio of the peak intensity at the center wavelength of the first LED device to the peak intensity at the center wavelength of the second LED device may be 1:1.2 to 1:1.5.

If the ratio of the peak intensity at the center wavelength of the first LED element to the peak intensity at the center wavelength of the second LED element is less than 1:1.2, the color of the lighting is not natural and has a bluish color. It may become unsuitable, and conversely, if it exceeds 1:1.5, there is a fear that the sterilization power may be lowered because the energy ratio of the visible light region increases.

In addition, according to a preferred embodiment of the present invention, the first LED device may have a full width at half maximum of a central wavelength of 18 nm or less. If the half width of the central wavelength exceeds 18 nm, the intensity of light absorbed by porphyrins in bacteria at the central wavelength may be weakened, and thus the sterilizing power may be weakened. As the half width decreases, the intensity of the central wavelength becomes stronger even at the same light intensity, so there is an advantage in that the sterilization power is strengthened. The size of the half width can be reduced by a wavelength conversion filter to be described later.

In a preferred embodiment of the present invention, the antibacterial LED assembly may be provided with a wavelength conversion filter that additionally changes the wavelength band of the LED light source in the area through which light is transmitted from the LED element.

In the wavelength conversion filter, the wavelength conversion filter emitted from the LED device may have a structure in which three or more metal oxide layers having different interlayer refractive indices are alternately stacked. Since the three types of metal oxide layers have different refractive indices, it is possible to improve the reflective efficiency of only light in a desired wavelength band, and accordingly, the light emission wavelength region of the LED device can be changed, and the LED device is configured to have a narrow full width at half maximum can do.

According to a preferred embodiment of the present invention, the wavelength conversion filter has a first layer having a refractive index of 1.2 to 1.6, a second layer having a refractive index of 1.5 to 1.8, and a third layer having a refractive index of 1.6 to 2.1 as a first layer, a first layer It has a structure that is stacked alternately in the order of 2nd and 3rd layers,

It may satisfy the following conditional formula 1).

1) n1<n2<n3

In Conditional Expression 1), n1 is the refractive index of the first layer, n2 is the refractive index of the second layer, and n3 is the refractive index of the third layer.

That is, the first layer, the second layer, and the third layer in which the refractive index is sequentially increased may have a structure in which the layers are alternately stacked in order.

Through adjustment of the refractive index, only a specific wavelength region of a narrow region can be transmitted, and accordingly, an LED device emitting high intensity wavelengths in a clear narrow wavelength band as described above can be implemented.

Preferably, the wavelength conversion filter may be applied to the first LED device.

Also, in a preferred embodiment of the present invention, the first layer may include SiO ₂ , the second layer may include ZnO, and the third layer may include Al ₂ O ₃ .

Accordingly, the difference in refractive index between the first layer and the second layer and the second layer and the third layer can be minimized, and preferably, the difference in refractive index between the first layer and the second layer or the refractive index between the second layer and the third layer The difference may each independently be 0.05 to 0.2.

Accordingly, the full width at half maximum of the wavelength of light emitted from the LED device may appear narrow, and the decrease in illuminance of the LED device may be minimized.

In the wavelength conversion filter, the first layer, the second layer, and the third layer may be alternately stacked 3 to 10 times in the above order. If the stacking is less than 3 times, the half width may not be sufficiently narrow, and when the number of alternating stacking exceeds 10 times, the illuminance of the LED device is too low, thereby reducing the energy efficiency of the lighting.

In addition, in a preferred embodiment of the present invention, the wavelength conversion filter may satisfy the following conditional expression 2).

2) 0.7≤A/B≤1.0

In condition 2), A represents the illuminance measured at a distance of 1 m of the antibacterial LED assembly having the wavelength conversion filter, and B represents the illuminance measured at a distance of 1 m of the same antibacterial LED assembly without the wavelength conversion filter.

Therefore, the antibacterial LED assembly according to the present invention has the advantage that the illuminance of the entire antibacterial LED assembly is not significantly lowered while the first LED element has a center wavelength in the 400 to 410 nm region.

Preferably, in the wavelength conversion filter, the thickness of the first layer may be 20 to 100 nm, the thickness of the second layer may be 30 to 150 nm, and the thickness of the third layer may be 35 to 200 nm. When the thickness within the above range is satisfied, more clear wavelength conversion is possible.

Hereinafter, the present invention will be described in detail with reference to specific examples. However, the scope of the present invention is not limited by this embodiment.

<Example 1>

Blue LEDs with a central wavelength _of about ₃₈₀ to 410 nm and yellow LEDs with a central wavelength _of about 560 to 630 nm were prepared. [SiO ₂ /ZnO/Al ₂ O ₃ ] A wavelength conversion filter in the form of ⁵ was prepared.

The SiO ₂ layer had a thickness of about 70 nm and a refractive index of 1.24, the ZnO layer had a refractive index of 1.55 with a thickness of about 115 nm, and Al ₂ O ₃ had a refractive index of 1.88 with a thickness of about 150 nm.

A circular LED assembly was constructed by alternately arranging 45 each of the blue LED and the yellow LED in a 1:1 ratio like a chessboard, and the wavelength conversion filter was provided on the upper surface of the circular LED assembly to provide an LED assembly was completed.

<Example 2>

It was carried out in the same manner as in Example 1, except that the LED assembly was completed without the wavelength conversion filter.

<Example 3>

It was carried out in the same manner as in Example 1, except that the LED assembly was completed by adopting a red LED emitting a 620 to 625 nm region instead of the yellow LED.

<Example 4>

It was carried out in the same manner as in Example 1, except that the second layer was omitted from the wavelength conversion filter, [SiO ₂ /Al ₂ O ₃ ] ⁵ SiO ₂ layers and Al ₂ O ₃ layers were alternately stacked 5 times The point of applying a wavelength conversion filter was different.

<Example 5>

It was carried out in the same manner as in Example 1, except that the third layer was omitted from the wavelength conversion filter and a wavelength conversion filter in which SiO ₂ layers and ZnO layers were alternately stacked five times in the form of [SiO ₂ /ZnO] ⁵ was applied. was made differently.

<Comparative Example 1>

It was carried out in the same manner as in Example 1, except that 90 of the above blue LEDs were arranged without a yellow LED element to constitute an LED assembly.

<Comparative Example 2>

It was carried out in the same manner as in Comparative Example 1, except that the LED assembly was completed without the wavelength conversion filter.

<Experimental example>

The emission spectra of the LED assemblies prepared according to Examples and Comparative Examples were measured, and the peak wavelength and the half-maximum width at the peak wavelength were measured, respectively, and are shown in Table 1 below. Also, the color of each LED assembly is shown together.

In addition, Table 2 shows the sterilization power when the LED assembly is illuminated for 9 hours and 24 hours on E. coli (E. coli, Escherichia coli) and Staphylococcus aureus (S. aureus, Staphylococcus aureus) at a distance of 1 m and 1.5 m It was.

division peak wavelength half width apparent color peak 1
(<500nm) peak 2
(>500nm) peak 1
(<500nm) peak 2
(>500nm) Example 1 404nm 588nm 14nm 13nm White Example 2 401nm 591nm 28nm 25nm White Example 3 406nm 622nm 16nm 15nm purple Example 4 388nm 594nm 27nm 24nm light blue Example 5 404nm 592nm 29nm 26nm light blue Comparative Example 1 402nm - 15nm 14nm dark blue Comparative Example 2 408nm - 27nm 30nm dark blue

division E. coli S. aureus 1m 1.5m 1m 1.5m 9 hours 24 hours 9 hours 24 hours 9 hours 24 hours 9 hours 24 hours Example 1 60.455% 97.466% 35.730% 90.339% 54.240% 94.419% 34.315% 88.255% Example 2 45.500% 71.931% 21.038% 64.278% 37.497% 65.173% 18.879% 57.872% Example 3 58.917% 95.081% 31.797% 87.657% 51.649% 90.972% 33.450% 84.309% Example 4 44.827% 68.127% 28.786% 67.209% 33.543% 68.651% 22.307% 59.793% Example 5 47.399% 73.412% 26.951% 75.493% 40.852% 59.328% 25.818% 49.060% Comparative Example 1 61.207% 96.952% 33.120% 92.537% 55.132% 92.945% 36.521% 89.905% Comparative Example 2 57.752% 92.735% 35.661% 84.192% 52.933% 86.975% 31.845% 83.419%

Referring to Table 1, it was found that Comparative Examples 1 and 2 were not suitable for use as indoor lighting because the color of the lighting was dark blue as a result of the absence of the yellow LED element. In particular, Comparative Example 2 was not provided with a wavelength conversion filter, and it was confirmed that the sterilization power was also somewhat lower than that of Comparative Example 1.

In addition, in Example 3, a red LED exceeding 600 nm was mixed instead of a yellow LED having a central wavelength of 585 to 595 nm to obtain a color close to purple, which was also found to be unsuitable for indoor lighting.

In Examples 4 and 5, a wavelength conversion filter having a two-layer alternating laminated structure was used, but the peak half width was widened and the apparent color was also light blue, which could cause eye fatigue, making it unsuitable for use in indoor lighting. it can be seen that In addition, it was found that the sterilization effect was also significantly reduced.

In Example 2, it was found that the half-maximum width of the blue LED was widened by not adopting the wavelength conversion filter, and the sterilization power was lower than that of Example 1 as the intensity of the central wavelength was weakened.

Claims (9)

A first LED element having a center wavelength of 400 to 410 nm and a second LED element having a center wavelength of 585 to 595 nm,
The antibacterial LED assembly is provided with a wavelength conversion filter that additionally changes the wavelength band of the LED light source in the area through which light is transmitted from the LED element,
The wavelength conversion filter has a structure in which three or more types of first, second, and third metal oxide layers having different interlayer refractive indices are alternately stacked in the order of the first layer, the second layer, and the third layer,
The wavelength conversion filter satisfies the following conditional expression 1), wherein the first layer has a refractive index of 1.2 to 1.6, the second layer has a refractive index of 1.5 to 1.8, and the third layer has a refractive index of 1.6 to 2.1 Antibacterial LED assembly made with:
1) n1<n2<n3
In Conditional Expression 1), n1 is the refractive index of the first layer, n2 is the refractive index of the second layer, and n3 is the refractive index of the third layer.
According to claim 1,
Antibacterial LED assembly, characterized in that the ratio of the half width at the center wavelength of the first LED element and the half width at the center wavelength of the second LED element is 1:1.6 to 1:3.0.
The method of claim 1,
Antibacterial LED assembly, characterized in that the ratio of the peak intensity at the center wavelength of the first LED element to the peak intensity at the center wavelength of the second LED element is 1:1.2 to 1:1.5.
3. The method of claim 2,
The first LED element is an antibacterial LED assembly, characterized in that the half width of the central wavelength is 18 nm or less.
delete delete The method of claim 1,
The first layer includes SiO ₂ , the second layer includes ZnO, and the third layer includes Al ₂ O ₃ Antibacterial LED assembly, characterized in that it includes.
According to claim 1,
The wavelength conversion filter is an antibacterial LED assembly, characterized in that the first layer, the second layer and the third layer are alternately laminated 3 to 10 times in the order.
The method of claim 1,
The wavelength conversion filter antibacterial LED assembly, characterized in that it further satisfies the following condition 2):
2) 0.7≤A/B≤1.0
In condition 2), A represents the illuminance measured at a distance of 1 m of the antibacterial LED assembly having the wavelength conversion filter, and B represents the illuminance measured at a distance of 1 m of the same antibacterial LED assembly without the wavelength conversion filter.

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