Wavelength conversion device, light source system and projection system

Patent metadata

Field	Value
Publication number	US-9897303-B2
Application number	US-201515310396-A
Country	US
Kind code	B2
Filing date	May 6, 2015
Priority date	May 13, 2014
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The present disclosure provides a wavelength conversion device, and its light source system and projection system. The wavelength conversion device includes a wavelength conversion material layer, and a first light-filtering layer on a first side of the wavelength conversion material layer. The wavelength conversion device also includes a first thermally-conductive dielectric layer configured between the wavelength conversion material layer and the first light-filtering layer. The first thermally-conductive dielectric layer has a thermal conductivity greater than or equal to the wavelength conversion material layer, and has a refractivity less than the wavelength conversion material layer. Accordingly, the heat generated by the wavelength conversion material layer may be timely conducted out, thus improving the conversion efficiency of the wavelength conversion device.

First claim

What is claimed is:

1. A wavelength conversion device, comprising:
a wavelength conversion material layer, and a first light-filtering layer disposed on a first side of the wavelength conversion material layer, the wavelength conversion device further comprising: a first thermally-conductive dielectric layer configured between the wavelength conversion material layer and the first light-filtering layer,
wherein the first thermally-conductive dielectric layer has a thermal conductivity greater than or equal to the wavelength conversion material layer, and has a refractivity less than the wavelength conversion material layer, and
the first thermally-conductive dielectric layer is a porous structural layer containing thermally-conductive particles.

2. The wavelength conversion device according to claim 1 , wherein:
the first thermally-conductive dielectric layer covers a surface of the first light-filtering layer, and
a contact area between the thermally-conductive particles and the first light-filtering layer is 10%-50% of a total area of the first light-filtering layer.

3. The wavelength conversion device according to claim 1 , wherein:
a thickness of the first thermally-conductive dielectric layer is less than 40 μm, or less than 20 μm.

4. The wavelength conversion device according to claim 1 , wherein:
the first thermally-conductive dielectric layer is made of thermally-conductive dielectric composites containing the thermally-conductive particles and glass powders.

5. The wavelength conversion device according to claim 1 , wherein:
the first thermally-conductive dielectric layer is made of the thermally-conductive particles treated by a silane coupling agent.

6. The wavelength conversion device according to claim 5 , wherein:
a volume fraction of the silane coupling agent on surface of the thermally-conductive particles in the first thermally-conductive dielectric layer is 0.1%-1%, and the silane coupling agent includes KH550, KH560, or KH570.

7. The wavelength conversion device according to claim 1 , wherein:
the wavelength conversion material layer is a silica gel-phosphor powder layer made of phosphor powders and silica gel.

8. The wavelength conversion device according to claim 1 , wherein:
the wavelength conversion material layer is a luminescent glass comprising phosphor powders and glass powders.

9. The wavelength conversion device according to claim 1 , wherein:
a thermal conductivity of the thermally-conductive particles is higher than 10 W/mK.

10. The wavelength conversion device according to claim 9 , wherein:
the thermally-conductive particles are one or more materials selected from diamond, carbon nanotubes, graphene, aluminum nitride, silicon nitride, silicon carbide, boron nitride, aluminum oxide, zinc oxide, and barium sulfate.

11. The wavelength conversion device according to claim 9 , wherein:
the thermally-conductive particles are flake-shaped or fiber-shaped, and the thermally-conductive particles are white or transparent.

12. The wavelength conversion device according to claim 9 , wherein:
a particle size of the thermally-conductive particles is 0.1 μm-20 μm.

13. The wavelength conversion device according to claim 1 , further comprising:
a second light-filtering layer disposed on a second side of the wavelength conversion material layer.

14. The wavelength conversion device according to claim 13 , further comprising:
a dielectric layer configured between the wavelength conversion material layer and the second light-filtering layer,
wherein the dielectric layer has a refractivity less than the wavelength conversion material layer.

15. The wavelength conversion device according to claim 13 , further comprising:
a second thermally-conductive dielectric layer configured between the wavelength conversion material layer and the second light-filtering layer,
wherein the second thermally-conductive dielectric layer has a thermal conductivity greater than or equal to the wavelength conversion material layer, and has a refractivity less than the wavelength conversion material layer.

16. The wavelength conversion device according to claim 15 , wherein:
the second thermally-conductive dielectric layer has a same feature as the first thermally-conductive dielectric layer.

17. A light source system including a wavelength conversion device according to claim 1 , further comprising:
an excitation light source providing a light source for the wavelength conversion device.

18. A projection system including the light source system according to claim 17 , comprising:
a projection unit, and
a light source system.

Assignees

• Appotronics Corp Ltd

Inventors

• Wu Xiliang
• Tian Zifeng
• Dai Dayan
• Chen Yusan
• Xu Yanzheng

Classifications

• F21V29/86

  Ceramics or glass · CPC title

• G03B21/16

  Cooling; Preventing overheating · CPC title

• G03B21/204

  using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197) · 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

• F21V29/502 Primary

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