Light-emitting device, wavelength conversion unit, and headlight or display apparatus

Patent metadata

Field	Value
Publication number	US-2022344549-A1
Application number	US-202017642436-A
Country	US
Kind code	A1
Filing date	Sep 25, 2020
Priority date	Sep 27, 2019
Publication date	Oct 27, 2022
Grant date	—

Abstract

There is provided a light-emitting device (1) including: a light-emitting element (20); a light-transmissive heat dissipation member (11) having a plate shape; a wavelength conversion member (12) that takes in, from a side of a light scattering layer (12a), light that is emitted from the light-emitting element (20) and passes through the light-transmissive heat dissipation member (11), and converts a wavelength in a fluorescent layer (12b); a lateral heat dissipation member that has a plate shape, includes a high-heat conduction member (13) in contact with a side surface of the wavelength conversion member (12) via a light reflection member (14), and is in contact with an upper surface of the light-transmissive heat dissipation member (11); and a package (21) that houses the light-emitting element (20) and supports a wavelength conversion unit (100) including the light-transmissive heat dissipation member (11), the wavelength conversion member (12), and the lateral heat dissipation member.

First claim

1 . A light-emitting device, comprising:
a light-emitting element; a light-transmissive heat dissipation member having a plate shape, light that is emitted from the light-emitting element passing through the light-transmissive heat dissipation member; a wavelength conversion member that includes a laminated layer of a light scattering layer and a fluorescent layer, takes in, from a side of the light scattering layer, light that is emitted from the light-emitting element and passes through the light-transmissive heat dissipation member, and converts a wavelength in the fluorescent layer; a lateral heat dissipation member that has a plate shape, includes a high-heat conduction member in contact with a side surface of the wavelength conversion member via a light reflection member, and is in contact with an upper surface of the light-transmissive heat dissipation member; and a package that houses the light-emitting element and supports a wavelength conversion unit including the light-transmissive heat dissipation member, the wavelength conversion member, and the lateral heat dissipation member.

2 . The light-emitting device according to claim 1 , wherein
a thickness of the light scattering layer is within a range of 50 μm or more and 200 μm or less.

3 . The light-emitting device according to claim 1 , wherein
a thickness of the fluorescent layer is within a range of 50 μm or more and 100 μm or less.

4 . The light-emitting device according to claim 1 , wherein
the light scattering layer is formed of a material obtained by removing an activator of the fluorophore contained in the fluorescent layer from a material of the fluorescent layer.

5 . The light-emitting device according to claim 1 , wherein
the package is bonded to the light-transmissive heat dissipation member and the high-heat conduction member.

6 . The light-emitting device according to claim 1 , wherein
a space inside the package in which the light-emitting element is housed is hermetically sealed by the package and the wavelength conversion unit.

7 . The light-emitting device according to claim 1 , wherein
part or whole of a side surface of the wavelength conversion member on a side of the light-transmissive heat dissipation member has an inclined surface such that a width of the wavelength conversion member is narrowed toward the light-transmissive heat dissipation member.

8 . The light-emitting device according to claim 1 , wherein
the inclined surface and the upper surface of the light-transmissive heat dissipation member are adhered by a light-reflecting adhesive material.

9 . The light-emitting device according to claim 1 , wherein
the lateral heat dissipation member includes a heat dissipation member that has a plate shape, is in contact with the upper surface of the light-transmissive heat dissipation member and a lower surface of the high-heat conduction member, and is in contact with a side surface of the wavelength conversion member directly or via a light reflector, thermal conductivity of the high-heat conduction member is higher than thermal conductivity of the heat dissipation member, and the thermal conductivity of the heat dissipation member is higher than thermal conductivity of the light-transmissive heat dissipation member.

10 . The light-emitting device according to claim 9 , wherein
the heat dissipation member has, in a side portion on a side of the wavelength conversion member, a recessed portion for providing a gap between the heat dissipation member and the side surface of the wavelength conversion member.

11 . The light-emitting device according to claim 10 , wherein
a light reflection member is provided in the gap.

12 . The light-emitting device according to claim 1 , wherein
an inside of the package is hermetically sealed by a seal member sandwiched between the high-heat conduction member and the package.

13 . The light-emitting device according to claim 1 , which is used for a headlight or a display apparatus.

14 . A wavelength conversion unit, comprising:
a wavelength conversion member in which a fluorescent layer containing a fluorophore and a light scattering layer for scattering excitation light of the fluorophore are laminated; a light-transmissive heat dissipation member that has a plate shape and is in contact with a surface of the light scattering layer of the wavelength conversion member, the excitation light passing through the light-transmissive heat dissipation member; and a lateral heat dissipation member that includes a high-heat conduction member that is in contact with a side surface of the wavelength conversion member via a light reflection member and is in contact with an upper surface of the light-transmissive heat dissipation member, wherein thermal conductivity of the light-transmissive heat dissipation member is higher than thermal conductivity of the wavelength conversion member, and thermal conductivity of the high-heat conduction member is higher than the thermal conductivity of the light-transmissive heat dissipation member.

15 . The wavelength conversion unit according to claim 14 , wherein
a thickness of the light scattering layer is within a range of 50 μm or more and 200 μm or less.

16 . The wavelength conversion unit according to claim 14 , wherein
a thickness of the fluorescent layer is within a range of 50 μm or more and 100 μm or less.

17 . The wavelength conversion unit according to claim 14 , wherein
the light scattering layer is formed of a material obtained by removing an activator of the fluorophore contained in the fluorescent layer from a material of the fluorescent layer.

18 . The wavelength conversion unit according to claim 14 , which is used for a headlight or a display apparatus.

19 . A headlight or a display apparatus, comprising:
the light-emitting device according to claim 1 .

20 . A headlight or a display apparatus, comprising:
the wavelength conversion unit according to claim 14 .

Assignees

• Sony Group Corp

Inventors

• Wada Satoshi
• Hayashi Kento
• Kawamura Yuhki
• Murayama Masahiro
• Motobayashi Hisayoshi
• Takiguchi Yoshiro
• Kawanishi Hidekazu
• Yanashima Katsunori

Classifications

• F21V29/502

  characterised by the adaptation for cooling of specific components · CPC title

• F21V9/30

  Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) · CPC title

• H01S5/0087

  for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials · CPC title

• F21S41/16

  Laser light sources · CPC title

• F21S41/176

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title