Phosphor element and illumination device

Patent metadata

Field	Value
Publication number	US-2021184425-A1
Application number	US-202117186578-A
Country	US
Kind code	A1
Filing date	Feb 26, 2021
Priority date	Aug 28, 2018
Publication date	Jun 17, 2021
Grant date	—

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

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, and 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.

2 . The phosphor element of claim 1 ,
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°.

3 . 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.

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

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

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

7 . 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.

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

9 . An illumination device comprising:
a light source oscillating a laser light; and said phosphor element of claim 1 .

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

• F21V9/30 Primary

  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

• F21V29/86

  Ceramics or glass · CPC title

• F21V29/89

  Metals · CPC title