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CN-122028574-A - LED assembly, LED filament and LED lamp

CN122028574ACN 122028574 ACN122028574 ACN 122028574ACN-122028574-A

Abstract

The disclosure relates to an LED assembly, an LED filament, and an LED lamp, the LED assembly comprising at least one first blue LED chip having a peak emission wavelength between 445nm and 465nm, at least one second blue LED chip having a peak emission wavelength between 465nm and 480nm, wherein the first blue LED chip and the second blue LED chip combine to form an LED package, and a yellow-green phosphor having a peak emission wavelength between 510nm and 535nm coated on a surface of the LED package. By the mode, the peak emission wavelength dispersion of the blue light of the LED component is enabled to be in the range of 445nm to 465nm and 465nm to 480nm, and the peak intensity of the blue light is reduced in the two ranges, so that harm to human eyes caused by the blue light is reduced, and degradation of light efficiency and color rendering of white light is avoided.

Inventors

  • Xiao Gun
  • GAO JIE
  • LI XUDA

Assignees

  • 赛万特科技有限责任公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (18)

  1. 1. An LED assembly (10), comprising: At least one first blue LED chip (1011), the at least one first blue LED chip (1011) having a peak emission wavelength between 445nm and 465 nm; At least one second blue LED chip (1013), the at least one second blue LED chip (1013) having a peak emission wavelength between 465nm and 480nm, wherein the at least one first blue LED chip (1011) and the at least one second blue LED chip (1013) combine to form an LED package (101), and And a yellow-green phosphor (103) coated on a surface of the LED package (101), the yellow-green phosphor (103) having a peak emission wavelength between 510nm and 535 nm.
  2. 2. The LED assembly (10) of claim 1, wherein: The yellow-green fluorescent powder (103) comprises aluminate yellow powder and yellow-green powder, silicate yellow powder and yellow-green powder.
  3. 3. The LED assembly (10) of claim 2, wherein: The yellow-green fluorescent powder (103) is dispersed in the fluorescent glue (105), and the mass percentage of the yellow-green fluorescent powder (103) in the fluorescent glue (105) is 4% -15%.
  4. 4. The LED assembly (10) according to any one of claims 1 to 3, wherein the LED assembly (10) further comprises: a manganese fluoride red phosphor (107) coated on the surface of the LED package (10).
  5. 5. The LED assembly (10) of claim 4, wherein: the manganese fluoride red phosphor (107) is manganese doped potassium fluosilicate.
  6. 6. The LED assembly (10) of claim 5, wherein: The manganese fluoride red phosphor (107) has a peak emission wavelength between 600nm and 650nm and a half-wave peak width of less than 60nm.
  7. 7. The LED assembly (10) of claim 4, wherein: the manganese fluoride red fluorescent powder (107) is dispersed in the fluorescent glue (105), and the mass percentage of the manganese fluoride red fluorescent powder (107) in the fluorescent glue (105) is 5-10%.
  8. 8. The LED assembly (10) of claim 7, wherein: The LED component (10) is provided with at least two layers of fluorescent glue, and the manganese fluoride red fluorescent powder (107) and the yellow-green fluorescent powder (103) are respectively positioned in one layer of fluorescent glue in the at least two layers of fluorescent glue.
  9. 9. The LED assembly (10) of claim 8, wherein: a first layer of fluorescent glue (1051) of the at least two layers of fluorescent glue covers the LED package body (101), and a second layer of fluorescent glue (1053) covers the first layer of fluorescent glue (1051).
  10. 10. The LED assembly (10) of claim 9, wherein: The manganese fluoride red fluorescent powder (107) is dispersed in the first layer fluorescent glue (1051), the yellow-green fluorescent powder (103) is dispersed in the second layer fluorescent glue (1053), and the mass percentage of the manganese fluoride red fluorescent powder (107) in the first layer fluorescent glue (1051) is 5-10%.
  11. 11. An LED filament (30), characterized in that it comprises: a substrate (3001); At least one first blue LED chip (3011) mounted on the substrate (3001), the at least one first blue LED chip (3011) having a peak emission wavelength between 445nm and 465 nm; At least one second blue LED chip (3013) mounted on the substrate (3001), the at least one second blue LED chip (3013) having a peak emission wavelength between 465nm and 480nm, wherein the at least one first blue LED chip (3011) and the at least one second blue LED chip (3013) are combined together with the substrate (3001) to form an LED package (301), and A yellow-green phosphor (307) dispersed within a phosphor paste (309) and having a peak emission wavelength between 510nm and 535nm, the phosphor paste (309) being coated on a surface of the LED package (301).
  12. 12. The LED filament (30) of claim 11, wherein: The yellow-green phosphor (307) includes aluminate series yellow powder and yellow-green powder, and silicate series yellow powder and yellow-green powder.
  13. 13. The LED filament (30) of claim 12, wherein: the mass percentage of the yellow-green fluorescent powder (307) in the fluorescent glue (309) is 4% -15%.
  14. 14. The LED filament (30) of claim 13, wherein: the LED filament (30) further comprises a manganese fluoride red phosphor (311).
  15. 15. The LED filament (30) of claim 14, wherein: The manganese fluoride red phosphor (311) has a peak emission wavelength between 600nm and 650nm and a half-wave peak width of less than 60nm.
  16. 16. The LED filament (30) of claim 14, wherein: the LED filament (30) is provided with at least two layers of fluorescent glue, wherein a first layer of fluorescent glue (3091) covers the LED packaging body (301), a second layer of fluorescent glue (3093) covers the first layer of fluorescent glue (3091), and manganese fluoride red fluorescent powder (311) and yellow-green fluorescent powder (309) are respectively positioned in one layer of fluorescent glue in the at least two layers of fluorescent glue.
  17. 17. An LED lamp (3) adapted to be connected to a power source for providing an illumination source, comprising: the LED assembly (10) according to any one of claims 1 to 10, and And a lamp body (32) for accommodating the LED assembly (10).
  18. 18. An LED lamp (3) adapted to be connected to a power source for providing an illumination source, comprising: The LED filament (30) according to any one of claims 11 to 16, and And the lamp body (32) is used for accommodating the LED filament (30).

Description

LED assembly, LED filament and LED lamp Technical Field The present disclosure relates to the field of lighting fixtures, and more particularly, to an LED assembly, an LED filament, and an LED light fixture capable of reducing blue light hazard. Background With the development of LED technology, white LED lamps are becoming popular for energy conservation and long life. However, white LED lamps, particularly in the case of high color temperature (CCT), for example, 5000K or more, emit blue light with a relatively high proportion, and exposure to high density blue light for a long period of time is disadvantageous for the health of human eyes. The damage of blue light (400-500 nm) to human eyes mainly comes from a part with a short wavelength, especially blue light with a peak emission wavelength of 415-455 nm, and the blue light can directly penetrate through a crystalline lens to reach retina, damage photoreceptor cells and pigment epithelial cells of the retina, and eye diseases such as vision degradation, visual fatigue and macular degeneration can be caused. In addition, blue light is an indispensable component in the white light formation process, and especially the absence of blue light having a peak emission wavelength of between 415nm and 455nm leads to significant deterioration in the light efficiency and color rendering properties of white light. In order to reduce the potential damage of blue light to human eyes, the peak value of the emission wavelength of the blue LED chip in the white LED lamp is shifted from the range of 415nm to 455nm, for example, from about 475nm in the prior art. However, although this reduces damage to human eyes by blue light in the white LED lamp to some extent, it also results in a decrease in light efficiency and color rendering of the white LED lamp. In addition, the use of a single 465-480 nm blue LED chip also results in a single blue intensity that is too strong. Disclosure of Invention In order to overcome the technical problems described above, the present disclosure provides an LED assembly, an LED filament, and an LED lamp, which reduces damage of blue light to human eyes on the one hand and avoids degradation of light efficiency and color rendering of white light on the other hand by combining a blue LED chip having a peak emission wavelength between 445nm and 465nm with a blue LED chip having a peak emission wavelength between 465nm and 480nm such that the peak emission wavelength dispersion of blue light of the LED assembly or LED filament occurs in a range between 445nm and 465nm to 480nm, and peak intensity of blue light is reduced in both ranges, and coating a predetermined phosphor on a surface of an LED package. According to an embodiment of the present disclosure, there is provided an LED assembly including at least one first blue LED chip having a peak emission wavelength between 445nm and 465nm, at least one second blue LED chip having a peak emission wavelength between 465nm and 480nm, wherein the first blue LED chip and the second blue LED chip are combined to form an LED package, and a yellow-green phosphor coated on a surface of the LED package, the yellow-green phosphor having a peak emission wavelength between 510nm and 535 nm. By the above way, the peak emission wavelength dispersion of the blue light of the LED component is enabled to be in the range of 445nm to 465nm and 465nm to 480nm, the peak intensity of the blue light is reduced in the two ranges, and the surface of the LED package body is coated with the yellow-green fluorescent powder, so that the damage of the blue light to human eyes is reduced, and the degradation of the light efficiency and the color rendering property of the white light is avoided. In the LED assembly according to the present disclosure, the yellow-green phosphor includes aluminate-series yellow powders and yellow-green powders and silicate-series yellow powders and yellow-green powders. In the above manner, a specific example of the yellow-green phosphor is provided. In the LED component according to the disclosure, the yellow-green fluorescent powder is dispersed in the fluorescent glue, and the mass percentage of the yellow-green fluorescent powder in the fluorescent glue is 4% -15%. In the above manner, a specific example of the content of the yellow-green phosphor in the phosphor paste is provided. In the LED assembly according to the present disclosure, the LED assembly further includes a manganese fluoride red phosphor coated on a surface of the LED package. The light efficiency and the color rendering property of the white light can be further improved by coating the surface of the LED packaging body with the manganese fluoride red fluorescent powder. In an LED assembly according to the present disclosure, the manganese fluoride red phosphor is manganese doped potassium fluorosilicate. In the above manner, a specific example of a manganese fluoride red phosphor is provided. In an LED assembly according