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KR-20260063523-A - UV light emitting device

KR20260063523AKR 20260063523 AKR20260063523 AKR 20260063523AKR-20260063523-A

Abstract

The ultraviolet light emitting device of the present disclosure comprises: a light source emitting ultraviolet light with a peak wavelength range of 190 nm to 230 nm; and an optical filter having a dielectric multilayer film to which ultraviolet light emitted from the light source is incident, wherein the transmission spectrum of the optical filter for ultraviolet light incident on the optical filter at an angle of incidence of 0 degrees comprises: a transmission wavelength band that transmits a portion of the wavelength band of ultraviolet light emitted from the light source, and wherein the transmission wavelength band comprises a wavelength band greater than 237 nm and less than or equal to 250 nm.

Inventors

  • 남궁석

Assignees

  • 엘지전자 주식회사

Dates

Publication Date
20260507
Application Date
20241030

Claims (16)

  1. Ultraviolet light with a peak wavelength range of 190 nm to 230 nm Emitting light source; and Ultraviolet rays emitted from the above light source are incident thereon, and the optical filter comprises a dielectric multilayer film, and The transmission spectrum of the optical filter for ultraviolet rays incident on the optical filter at an angle of 0 degrees is: It includes a transmission wavelength band that transmits a portion of the wavelength band of ultraviolet rays emitted from the above light source, and The above-mentioned transmission wavelength band is an ultraviolet light emitting device including a wavelength band greater than 237 nm and less than or equal to 250 nm.
  2. In Article 1, The above optical filter is, Ultraviolet light emitting device that attenuates ultraviolet rays with a wavelength of 257 nm.
  3. In Article 1, The above transmission wavelength band is: Ultraviolet emitting device including a wavelength band greater than 250 nm and less than 255 nm.
  4. In Article 1, The above transmission wavelength band is, An ultraviolet emitting device having a transmittance of about 5.0% or more of the optical filter above.
  5. In Article 1, The above transmission wavelength band is: The above optical filter includes a main transmission wavelength band in which the transmittance is approximately 70.0% or higher, and The upper limit of the above main transmission wavelength band is, Ultraviolet emitting device located in a wavelength band exceeding 240 nm.
  6. In Article 5, The above main transmission wavelength band is: Includes the wavelength at which the maximum transmittance of the above optical filter appears, The above maximum transmittance is, UV emitting device with approximately 80.0% or more.
  7. In Article 6, The wavelength at which the highest transmittance appears in the above optical filter is, Ultraviolet emitting device located in a wavelength band exceeding 222 nm.
  8. In Article 7, The wavelength at which the highest transmittance appears in the above optical filter is, Ultraviolet emitting device located in the wavelength band exceeding 230 nm.
  9. In Article 1, The upper limit of the above transmission wavelength band is, Ultraviolet emitting device located in a wavelength band of less than 275 nm.
  10. In Article 1, The above-mentioned dielectric multilayer film is, An ultraviolet light-emitting device formed by alternately stacking high-refractive-index layers and low-refractive-index layers.
  11. In Article 10, The above high refractive index layer is formed of hafnium oxide ( HfO2 ), and The above low-refractive-index layer is formed of silicon dioxide ( SiO2 ) in an ultraviolet light-emitting device.
  12. In Article 11, The above high-refractive-index layer and the above low-refractive-index layer are, Ultraviolet light-emitting device stacked between 40 and 44 layers.
  13. In Article 1, The transmission spectrum of the optical filter for ultraviolet rays incident on the optical filter at an angle of incidence greater than 25 degrees and less than or equal to 30 degrees is: It includes an intermediate transmission wavelength band that transmits 75% or more of a portion of the wavelength band of ultraviolet rays emitted from the above light source, and The above intermediate transmission wavelength band is: Ultraviolet light emitting device including a 222nm wavelength band.
  14. In Article 1 or Article 13, The transmission spectrum of the optical filter for ultraviolet rays incident on the optical filter at an angle of incidence of 35 degrees or more and less than 45 degrees is: It includes a high-angle transmission wavelength band that transmits a portion of the wavelength band of ultraviolet rays emitted from the above light source, and The above high-angle transmission wavelength band is: The above optical filter includes a high-angle main transmission wavelength band with a transmittance of approximately 60.0% or higher, and The above high-angle main transmission wavelength band is, Ultraviolet light emitting device including a wavelength of 222 nm.
  15. In Paragraph 14, An ultraviolet emitting device in which the transmittance of light in the 222nm wavelength band incident on the optical filter at an angle of incidence of 35 degrees or more and less than 45 degrees is 50% or more compared to the transmittance of light in the 222nm wavelength band incident on the optical filter at an angle of incidence of 0 degrees.
  16. In Paragraph 14, An ultraviolet emitting device having a transmittance of light in the 222nm wavelength band incident on the optical filter at an angle of incidence of 35 degrees or more and less than 45 degrees that is 60% or more compared to the transmittance of light in the 222nm wavelength band incident on the optical filter at an angle of incidence of 0 degrees.

Description

UV light emitting device The present disclosure relates to an ultraviolet light emitting device. Ultraviolet lamps generate ultraviolet rays and are used in various fields for the purpose of sterilizing bacteria and fungi. Ultraviolet lamps generate ultraviolet rays (UV) of various wavelengths through materials provided inside the lamp. For example, ultraviolet lamps can generate UV-A (315 nm to 400 nm), UV-B (280 nm to 315 nm), UV-C (100 nm to 280 nm), etc. Among these, ultraviolet rays with wavelengths corresponding to UV-C have the best sterilizing power. When UV-C is irradiated on bacteria and fungi, their DNA is damaged and they die. In other words, UV-C has effective sterilizing power against various bacteria by damaging the DNA of living organisms. Therefore, sterilization using ultraviolet lamps is more efficient than sterilization by heat, chemicals, ozone, or radiation. Recently, devices are also being developed that selectively irradiate ultraviolet rays in the wavelength range of 190 nm to 230 nm, which have been found to be harmless to the human body while providing ultraviolet sterilization effects, particularly the 222 nm wavelength known as Far UVC. To obtain light with a wavelength of 222 nm, the dust-proof gas is mainly KrCl, an excimer gas. Such ultraviolet lamps must create a vacuum atmosphere within the internal space of the tube and inject gas between them. The internal space becomes a discharge space, which can generate far-ultraviolet rays through light emission. The ultraviolet lamp induces a discharge by applying voltage through electrodes. The 'ultraviolet light irradiation device' disclosed in Korean Published Patent No. 10-2023-0156780 discloses: a light source emitting ultraviolet light; a housing formed with a light extraction unit that accommodates the light source and extracts ultraviolet light emitted from the light source out of the housing; an optical filter disposed in the light extraction unit that selectively transmits ultraviolet light; and a diffuse transmission member disposed in the light extraction unit that diffusely transmits ultraviolet light. The light source includes a plurality of light-emitting tubes arranged spaced apart from each other in one direction. The aforementioned conventional ultraviolet light irradiation device uses a diffuse transmission member to convert the emission angle of the ultraviolet light emitted from the light extraction unit to be greater than the incident angle of the incident ultraviolet light. However, there is a problem in that some of the ultraviolet light emitted from the light source is reflected by the diffuse transmission member, resulting in light loss. Furthermore, since a separate diffuse transmission member must be formed, there are problems such as increased volume or increased complexity of the process. In addition, there is a problem in that the amount of light extracted is reduced because some light is absorbed by the diffuser. Furthermore, the aforementioned conventional ultraviolet light irradiation device consists of multiple light-emitting tubes arranged spaced apart from each other, making it difficult to directly coat an optical filter onto the light source. Therefore, there is a problem in that the light source and the optical filter must be arranged separately. In addition, for an optical filter to be placed separately, a substrate is required for the filter material to be coated. However, there is a problem in that some of the ultraviolet light emitted from the light source is reflected from the substrate, causing light loss. In addition, due to the light source consisting of multiple light-emitting tubes arranged spaced apart from each other, there is a problem in that light is not emitted uniformly over the area of the light extraction section. Prior Art: Korean Patent Publication No. 10-2023-0156780 (Publication Date: Nov. 14, 2023) FIG. 1 is a bottom perspective view of an ultraviolet light emitting device according to one embodiment of the present disclosure. FIG. 2 is an exemplary diagram illustrating the appearance of ultraviolet light being irradiated in an indoor space where an ultraviolet light emitting device according to one embodiment of the present disclosure is installed. FIG. 3 is a perspective view of an ultraviolet light emitting device according to one embodiment of the present disclosure. Figure 4 is a part of the cross-sectional view of line 91-92 of Figure 1. FIG. 5 is a perspective view of an ultraviolet light emitting device according to one embodiment of the present disclosure. FIG. 6 is a perspective view of an ultraviolet light emitting device according to one embodiment of the present disclosure. FIG. 7 is an exploded view of an ultraviolet light emitting device according to one embodiment of the present disclosure. FIG. 8 is a perspective view of a part of an ultraviolet light emitting device according to one embodiment of the present disclosure. FIG. 9 is a spectrum of ultravio