LED module and lighting apparatus

Patent metadata

Field	Value
Publication number	US-11560986-B2
Application number	US-202117533689-A
Country	US
Kind code	B2
Filing date	Nov 23, 2021
Priority date	Dec 28, 2020
Publication date	Jan 24, 2023
Grant date	Jan 24, 2023

Abstract

A light emitting diode (LED) module that is configured to emit white light is provided. The LED module includes: a blue light emitting diode configured to emit blue light having a first peak wavelength of 420 nm to 465 nm; at least one wavelength conversion material that is configured to convert a portion of the blue light into converted light of a different wavelength; and a near-infrared light source configured to emit additional light having a second peak wavelength in a range of 740 nm to 900 nm and a full width at half maximum (FWHM) of 120 nm or less. The converted light, another portion of the blue light, and the additional light combine to form the white light.

First claim

What is claimed is:

1. A light emitting diode (LED) module that is configured to emit white light, the LED module comprising:
a blue light emitting diode configured to emit blue light having a first peak wavelength of 420 nm to 465 nm;
at least one wavelength conversion material that is configured to convert a portion of the blue light into converted light of a different wavelength; and
a near-infrared light source configured to emit additional light having a second peak wavelength in a range of 740 nm to 900 nm and a full width at half maximum (FWHM) of 120 nm or less,
wherein the converted light, another portion of the blue light, and the additional light combine to form the white light, and
wherein, in a spectrum of the white light, the white light has a peak intensity in the range of 740 nm to 900 nm, and the peak intensity is greater than or equal to 4.5% of a peak intensity of the blue light.

2. The LED module of claim 1 , wherein the near-infrared light source comprises a near-infrared wavelength conversion material that is configured to be excited by the blue light to emit the additional light having the second peak wavelength in the range of 740 nm to 900 nm, and the full width at half maximum 120 nm or less.

3. The LED module of claim 2 , wherein the near-infrared wavelength conversion material comprises at least one phosphor selected from a group consisting of Ca(Al 12-x-y , Ga y ) O 19 :xCr 3+ (0≤x≤1, 0≤y≤6), Lu 3 Al 5 O 12 :Ce 3+ , Cr 3+ , La 3 MgZrO 6 :Cr 3+ , LiInSi 2 O 6 :Cr 3+ , LiZnSnO:Cr 3+ , and ScBO 3 :Cr 3+ .

4. The LED module of claim 1 , wherein the near-infrared light source comprises at least one near-infrared LED configured to emit the additional light that has the second peak wavelength in the range of 740 nm to 900 nm and the full width at half maximum of 120 nm or less.

5. The LED module of claim 4 , wherein the at least one near-infrared LED is a plurality of near-infrared LEDs configured to emit light having respective peak wavelengths in the range of 740 nm to 900 nm that are different from each other.

6. The LED module of claim 5 , wherein the plurality of near-infrared LEDs comprises a first LED that is configured to emit first light having a peak wavelength in a range of 620 nm to 720 nm and a second LED that is configured to emit second light having a peak wavelength in a range of 720 nm to 900 nm.

7. The LED module of claim 1 , wherein in the spectrum of the white light, at least one valley exists between a peak wavelength in the range of 740 nm to 900 nm and an adjacent peak wavelength in a visible light wavelength band.

8. The LED module of claim 1 , wherein the white light has a color rendering index (CRI) of 70 or more.

9. The LED module of claim 1 , wherein the white light has a color temperature (CCT) in a range of 1800 to 6500K.

10. The LED module of claim 1 , wherein the at least one wavelength conversion material comprises a first wavelength conversion material that is configured to be excited by the blue light to emit first light having a peak wavelength in a range of 520 nm to 560 nm, and a second wavelength conversion material that is configured to be excited by the blue light to emit second light having a peak wavelength in a range of 600 nm to 650 nm.

11. The LED module of claim 10 , wherein the first wavelength conversion material and the second wavelength conversion material comprise at least one from among a phosphor and a quantum dot.

12. The LED module of claim 11 , wherein the first wavelength conversion material comprises at least one phosphor selected from a group consisting of (Ga,Gd,Y,Lu) 3 Al 5 O 12 :Ce 3+ , La 3 Si 6 N 11 :Ce 3+ , (Sr,Ca,Ba)Si 2 O 2 N 2 :Eu 2+ , (Sr,Ba) 2 SiO 4 :Eu 2+ , and β-SiAlON:Eu 2+ .

13. The LED module of claim 11 , wherein the second wavelength conversion material comprises at least one phosphor selected from a group consisting of (Sr,Ca)AlSiN 3 :Eu 2+ , CaAlSiN 3 :Eu 2+ , and K x SiF y :Mn 4+ (2≤x≤3, 4≤y≤7).

14. A light emitting diode (LED) module that is configured to emit white light, the LED module comprising:
a first light source comprising at least one light emitting diode, the first light source configured to emit first light in a visible band, the first light comprising blue light; and
a second light source configured to emit second light having a peak wavelength in a range of 740 nm to 900 nm,
wherein the white light is formed from the first light and the second light, and
wherein, in a spectrum of the white light, the white light has a peak intensity in the range of 740 nm to 900 nm, and the peak intensity is greater than or equal to 4.5% of a peak intensity of the blue light.

15. The LED module of claim 14 , wherein the second light source comprises a wavelength conversion material that is configured to be excited by the first light to emit the second light having the peak wavelength in the range of 740 nm to 900 nm.

16. The LED module of claim 15 , wherein the wavelength conversion material comprises at least one phosphor selected from a group consisting of Ca(Al 12-x-y , Ga y )O 19 :xCr 3+ (0≤x≤1, 0≤y≤6), Lu 3 Al 5 O 12 :Ce 3+ , Cr 3+ , La 3 MgZrO 6 :Cr 3+ , LiInSi 2 O 6 :Cr 3+ , LiZnSnO:Cr 3+ , and ScBO 3 :Cr 3+ .

17. The LED module of claim 14 , wherein the first light source and the second light source are formed together as a single package,
wherein the first light source comprises:
the at least one light emitting diode, wherein the at least one light emitting diode comprises a blue light emitting diode configured to emit the blue light having a peak wavelength in a range of 420 nm to 465 nm;
a package substrate on which the blue light emitting diode is mounted;
at least one first wavelength conversion material that is configured to be excited by a first portion of the blue light to convert the first portion of the blue light into converted light of a different color;

wherein the second light source is a second wavelength conversion material that is configured to be excited by a second portion of the blue light to emit the second light having the peak wavelength in the range of 740 nm to 900 nm, and
wherein the converted light, another portion of the blue light, and the second light combine to form the white light.

18. The LED module of claim 14 , wherein
the first light source is a first LED package, and the second light source is a second LED package,
wherein the first LED package comprises:
the at least one light emitting diode, the at least one light emitting diode comprising a first light emitting diode configured to emit the blue light, the blue light having a peak wavelength in a range of 420 nm to 465 nm;
a first package substrate on which the first light emitting diode is mounted; and
at least one first wavelength conversion material that is configured to be excited by a portion of the blue light to convert the portion of the blue light into converted light of a different color, and another portion of the blue light and the converted light combine to form the white light, and

wherein the second LED package comprises:
a second light emitting diode configured to emit light of a first wavelength; and
a second wavelength conversion material that is configured to be excited by the light of the first wavelength to emit the second light having the peak wavelength in the range of 740 nm to 900 nm.

19. A light emitting diode (LED) module that is configured to emit white light, the LED module comprising:
a package substrate;
a light emitting diode mounted on the package substrate, and configured to emit fi

Assignees

• Samsung Electronics Co Ltd

Inventors

• Choi Sungwoo
• Kim Seongmin
• Yun Jeongeun
• Kim Chohui
• Lee Seulgee
• Oh Jeongrok
• Yoon Chulsoo

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• H01L33/504

  Electricity · mapped topic

• F21K9/64 Primary

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title

• H01L25/0753

  Electricity · mapped topic

• H10W90/00 Primary

  Package configurations · CPC title