Laser stimulated white-light lighting system

Patent metadata

Field	Value
Publication number	US-9995459-B2
Application number	US-201615153897-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	Mar 24, 2016
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

The present invention discloses a laser stimulated white light lighting system, it includes a hemispherical reflector, a light-permeable board, a wavelength conversion layer, a reflective layer and plural heat-radiating structures, wherein the laser light emitted by a laser light source passes through a first light entrance hole of the hemispherical reflector and subsequently through the wavelength conversion layer to produce white light. With the implementation of the present invention, complex production process or equipment is not required thus reduce the system cost, the lighting system is capable of accurately outputting white light and promoting photon recycling effect to raise illumination efficiency. With the addition of a second light entrance hole, wavelength-division or angular division multiplexing can be carried out to raise the intensity of the output white light without increasing the etendue of the source light, thereby widening the range of application of the lighting system.

First claim

What is claimed is:

1. A laser stimulated white-light lighting system, comprising:
a hemispherical reflector having a reflective curved surface and an opening, wherein the reflective curved surface is provided with a first light entrance hole;
a light-permeable board fixedly provided at the opening and having an excitation area;
a wavelength conversion layer fixedly attached to the excitation area;
a reflective layer formed on a surface of an inner side of the light-permeable board in a region outside the excitation area; and
a plurality of heat-radiating structures fixedly provided on a surface of an outer side of the light-permeable board in a region outside the excitation area;
wherein laser light emitted by a laser light source passes through the first light entrance hole and then through the wavelength conversion layer to produce white light,
wherein the hemispherical reflector is further formed with at least one second light entrance hole and each said second light entrance hole allows passage of blue light from a blue laser to the wavelength conversion layer in order to produce white light, and
when the laser light and the blue light passing respectively through the first light entrance hole and the second light entrance holes reaching the wavelength conversion layer at the same time, wavelength-division multiplexing or angular division multiplexing being carried out.

2. The white-light lighting system of claim 1 , wherein the light-permeable board and the hemispherical reflector are connected together to form a hemispherical reflective enclosure.

3. The white-light lighting system of claim 1 , wherein the light-permeable board is formed of glass, a sapphire substrate, transparent ceramic, monocrystalline aluminum, or polycrystalline aluminum.

4. The white-light lighting system of claim 1 , wherein the laser light is blue, and the wavelength conversion layer is a phosphor powder layer, a quantum dot layer, or a layer formed of a photoluminescent material.

5. The white-light lighting system of claim 1 , wherein the wavelength conversion layer is a phosphor powder layer formed of yellow phosphor powder, of a mixture of red and green phosphor powder, or of a mixture of orange and green phosphor powder.

6. The white-light lighting system of claim 5 , wherein the phosphor powder layer is formed as a phosphor powder film or a phosphor powder crystal.

7. The white-light lighting system of claim 5 , wherein the phosphor powder layer is formed of yttrium aluminum garnet (YAG), a silicate, or a nitride.

8. The white-light lighting system of claim 1 , wherein the wavelength conversion layer is spray-coated on the excitation area.

9. The white-light lighting system of claim 1 , wherein the laser light has a wavelength ranging from 360 to 480 nm.

10. The white-light lighting system of claim 1 , wherein at least one of the heat-radiating structures is a heat-radiating fin.

11. The white-light lighting system of claim 1 , wherein wavelength-division multiplexing at 430 nm and 460 nm or angular division multiplexing is carried out to raise intensity of the white light produced, without increasing etendue of the laser light or the blue light.

Assignees

• Univ Nat Central

Inventors

• Sun Ching-Cherng
• Yang Tsung-Hsun

Classifications

• F21V7/045 Primary

  with spherical surface · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• F21V29/76

  with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section · CPC title

• F21V7/22

  characterised by materials, surface treatments or coatings, e.g. dichroic reflectors · CPC title

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title