Phosphor element with heat dissipating substrate that has thermally conductive metal plating film

Patent metadata

Field	Value
Publication number	US-12140304-B2
Application number	US-202117186578-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Aug 28, 2018
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A phosphor element includes a phosphor part including an incident face of the excitation light, opposing face opposing the incident face, and side face, the phosphor part converting at least a part of the excitation light incident onto the incident face to fluorescence and emitting the fluorescence from the opposing face or incident face, and a heat dissipating substrate provided on the side face of the phosphor part. The heat dissipating substrate is composed of a metal plating film composed of a metal having a thermal conductivity of 200 W/mK or higher.

First claim

The invention claimed is:

1. A phosphor element comprising:
a phosphor part including an incident face of an excitation light, an opposing face opposing said incident face, and a side face, said phosphor part converting at least a part of said excitation light incident onto said incident face to a fluorescence and emitting said fluorescence from said opposing face or said incident face,
a heat dissipating substrate directly or indirectly provided over said side face of said phosphor part, said heat dissipating substrate comprises a metal plating film comprising a metal having a thermal conductivity of 200 W/mK or higher,
wherein said heat dissipating substrate comprises a main face on a side of said incident face and a main face on a side of said opposing face, and
wherein an angle of said incident face and of a direction of growth of said metal plating film on a main face on said side of said opposing face or a main face on said side of said incident face of said heat dissipating substrate is 60° to 120°.

2. The phosphor element of claim 1 , further comprising an incident face-side supporting substrate on a main face of said heat dissipating substrate on said side of said incident face.

3. The phosphor element of claim 1 , further comprising an opposing face-side supporting substrate on the main face of said heat dissipating substrate on said side of said opposing face.

4. The phosphor element of claim 1 , further comprising a low refractive index layer between said phosphor part and said metal plating filmy.

5. The phosphor element of claim 1 , further comprising a reflection film between said phosphor part and said metal plating film.

6. The phosphor element of claim 1 , wherein an inclination angle of said side face of said phosphor part with respect to a line normal to said incident face is 5° or larger and 30° or smaller.

7. The phosphor element of claim 1 , comprising a plurality of said phosphor parts.

8. An illumination device comprising:
a light source oscillating a laser light; and
a phosphor element comprising:
a phosphor part including an incident face of an excitation light, an opposing face opposing said incident face, and a side face, said phosphor part converting at least a part of said excitation light incident onto said incident face to a fluorescence and emitting said fluorescence from said opposing face or said incident face,
a heat dissipating substrate directly or indirectly provided over said side face of said phosphor part, said heat dissipating substrate comprises a metal plating film comprising a metal having a thermal conductivity of 200 W/mK or higher,
wherein said heat dissipating substrate comprises a main face on a side of said incident face and a main face on a side of said opposing face, and
wherein an angle of said incident face and of a direction of growth of said metal plating film on a main face on said side of said opposing face or a main face on said side of said incident face of said heat dissipating substrate is 60° to 120°.

Assignees

• Ngk Insulators Ltd

Inventors

• Kondo Jungo
• Asai Keiichiro
• Okada Naotake

Classifications

• H10H20/8514

  characterised by their shape, e.g. plate or foil · CPC title

• H10H20/8515

  not being in contact with the bodies · CPC title

• F21Y2115/30

  Semiconductor lasers · CPC title

• F21V29/89

  Metals · CPC title

• F21V29/502 Primary

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