Fluorescent module and illumination device

Patent metadata

Field	Value
Publication number	US-11585494-B2
Application number	US-202117410847-A
Country	US
Kind code	B2
Filing date	Aug 24, 2021
Priority date	Aug 20, 2018
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

A fluorescent module includes a fluorescent member including a phosphor-containing layer, and a light reflecting layer disposed on the phosphor-containing layer. The phosphor-containing layer contains a YAG phosphor and a Ga-YAG phosphor within the same layer, the Ga-YAG phosphor being a phosphor in which a portion of the aluminum constituting the YAG phosphor is substituted with gallium. A volumetric ratio of the Ga-YAG phosphor to the entirety of the YAG phosphor and the Ga-YAG phosphor is in a range of 19.0% to 80%.

First claim

What is claimed is:

1. A fluorescent module comprising:
a fluorescent member including
a phosphor-containing layer, and
a light reflecting layer disposed on the phosphor-containing layer;

a heat dissipation member; and
an optical relaxation member configured to absorb and/or diffuse light, wherein
the phosphor-containing layer contains a YAG phosphor and a Ga-YAG phosphor within the same layer, the Ga-YAG phosphor being a phosphor in which a portion of the aluminum constituting the YAG phosphor is substituted with gallium,
a volumetric ratio of the Ga-YAG phosphor to the entirety of the YAG phosphor and the Ga-YAG phosphor is in a range of 19.0% to 80%,
the optical relaxation member is in contact with the heat dissipation member, and
the fluorescent member is disposed above the heat dissipation member, and has a bonding region for bonding the fluorescent member to the heat dissipation member, the bonding region being arranged outside a region where the optical relaxation member is disposed in a top view.

2. The fluorescent module according to claim 1 , wherein
the volumetric ratio of the Ga-YAG phosphor to the entirety of the YAG phosphor and the Ga-YAG phosphor is in a range of 60% to 80%.

3. The fluorescent module according to claim 1 , wherein
the fluorescent member is secured to the heat dissipation member so that the light reflecting layer is arranged between the phosphor-contacting layer and the heat dissipation member
the optical relaxation member is arranged with respect to the fluorescent member so that the light reflecting layer is arranged between the phosphor-containing layer and the optical relaxation member.

4. The fluorescent module according to claim 1 , further comprising:
a heat dissipation member to which the fluorescent member is secured so that the phosphor-containing layer, the light reflecting layer and the heat dissipation member being arranged in this order starting from a side of the phosphor-containing layer along a first direction normal to the phosphor-containing layer; and
an optical relaxation member configured to absorb and/or diffuse light, the optical relaxation member being arranged with respect to the fluorescent member so that the phosphor-containing layer, the light reflecting layer and the optical relaxation member being arranged in this order starting from the side of the phosphor-containing layer along the first direction.

5. The fluorescent module according to claim 1 , wherein
the optical relaxation member includes a light absorbing member configured to absorb light.

6. The fluorescent module according to claim 1 , wherein
the heat dissipation member defines a recess in an upper surface thereof, and
the optical relaxation member includes a polarization member disposed above the recess.

7. The fluorescent module according to claim 6 , wherein
the polarization member is in contact with the light reflecting layer.

8. The fluorescent module according to claim 1 , wherein
the heat dissipation member defines a recess in an upper surface thereof, and
the optical relaxation member includes a light absorbing member arranged in the recess and configured to absorb light.

9. The fluorescent module according to claim 8 , wherein
the optical relaxation member further includes a polarization member disposed above the recess.

10. The fluorescent module according to claim 8 , wherein
the optical relaxation member further includes a polarization member laterally penetrating the light absorbing member between an upper end and a lower end of lateral surfaces of the light absorbing member arranged in the recess.

11. The fluorescent module according to claim 8 , wherein
the light absorbing member covers a lateral surface and a bottom surface of the recess,
the light absorbing member and the polarization member defines a hollow space in the recess.

12. The fluorescent module according to claim 3 , further comprising
a submount disposed between the fluorescent member and the heat dissipation member and bonding the fluorescent member and the heat dissipation member.

13. The fluorescent module according to claim 3 , further comprising
a light transmissive member arranged between the fluorescent member and the optical relaxation member.

14. The fluorescent module according to claim 1 , wherein
the fluorescent member further includes a protective layer covering a part of the light reflecting layer.

15. An illumination device comprising:
the fluorescent module of claim 1 ; and
a laser device configured to emit a laser beam,
wherein the fluorescent module and the laser device are arranged so that the laser beam is incident on the phosphor-containing layer of the fluorescent module, and the optical relaxation member is disposed at a position on an extension of an optical path of the laser beam incident on the phosphor-containing layer of the fluorescent module.

16. The illumination device according to claim 15 , wherein
in the fluorescent module,
the heat dissipation member defines a recess in an upper surface thereof, and
the optical relaxation member has a polarization member disposed above the recess, and

the fluorescent module and the laser device are arranged so that the laser light incident at a predetermined angle with respect to the phosphor-containing layer of the fluorescent module, and the polarization member is configured so as not to transmit light incident at an angle different from the predetermined angle.

17. The illumination device according to claim 16 , wherein
the predetermined angle is the Brewster's angle with respect to an incident surface of the phosphor-containing layer.

Assignees

• Nichia Corp

Inventors

• Sugiyama Takafumi
• Hirai Toshiyuki
• Sano Masahiko
• Takasone Toru

Classifications

• F21K9/64 Primary

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

• F21V9/45

  by adjustment of photoluminescent elements · CPC title

• F21V9/08

  for producing coloured light, e.g. monochromatic; for reducing intensity of light (with provision for controlling the colour F21V9/40) · CPC title

• F21Y2115/30

  Semiconductor lasers · CPC title

• F21S41/16

  Laser light sources · CPC title