Method for obtaining a better color rendering with a photoluminescence plate

• US 20080093615A1
• Filed: 10/23/2006
• Published: 04/24/2008
• Est. Priority Date: 10/23/2006
• Status: Active Grant

• Current Assignee: Chang GUNG University
• Original Assignee: Chang GUNG University
• Inventors: Lu, Yuan-Chieh, Chou, Yi-Lun, Li, Jen-Chih, Lin, Yung-Hsiang, Lin, Ray-Ming
• Granted Patent: US 7,659,549 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source

Abstract

The present invention is a method for obtaining a better color rendering with a photoluminescence plate, and the better color rendering is obtained by using UV radiating on the photoluminescence plate stacked with a red photoluminescence plate, a green photoluminescence plate and a blue photoluminescence plate. Therefore, the color rendering is above 90% and close to the solar light. The photoluminescence plate can be made from directly coated with photoluminescence layers of three colors or with fully mixed fluorescent materials of three colors. Consequently, a white light relied on the present invention is more uniform than the conventional techniques with a color mixing performance based on tricolor LEDs.

Claims

1. A method for obtaining a better color rendering with a photoluminescence plate, comprising the steps of:

(a) disposing a tricolor photoluminescence plate on the radiation path of an UV illumination device; and

(b) coupling the UV illumination device with a power, such that a light radiating from the UV illumination device passes through the tricolor photoluminescence plate to excite the tricolor photoluminescence plate and radiate a white light.

2. The method as claimed in claim 1, wherein the tricolor photoluminescence plate is stacked with a red photoluminescence plate, a green photoluminescence plate and a blue photoluminescence plate in order.

3. The method as claimed in claim 1, wherein the tricolor photoluminescence plate is disposed with a red photoluminescence layer, a green photoluminescence layer and a blue photoluminescence layer in order.

4. The method as claimed in claim 1, wherein the tricolor photoluminescence plate is made of fully mixed fluorescent materials with three colors such as red, green and blue.

5. A method for obtaining a better color rendering with a photoluminescence plate, comprising the steps of:

(a) disposing two illumination devices, wherein one is a blue illumination device and the other is a red illumination device near to the blue illumination device;

(b) disposing a bicolor photoluminescence plate on the radiation path of the blue illumination device, wherein the bicolor is cyan and green; and

(c) coupling the blue illumination device and the red illumination device with a power, such that a blue light radiated from the blue illumination device passes through the bicolor photoluminescence plate to excite the bicolor photoluminescence plate and produce a colorful light, and then the colorful light is mixed with a red light radiated from the red LED illumination devices to appear a white light.

6. The method as claimed in claim 5, wherein the bicolor photoluminescence plate is stacked with a cyan photoluminescence plate and a green photoluminescence plate in order.

7. The method as claimed in claim 5, wherein the bicolor photoluminescence plate is disposed with a cyan photoluminescence layer and a green photoluminescence layer in order.

8. The method as claimed in claim 5, wherein the bicolor photoluminescence plate is made of fully mixed fluorescent materials with two colors such as cyan and green.

9. A method for obtaining a better color rendering with a photoluminescence plate, comprising the steps of:

(a) disposing two illumination devices, wherein one is a blue illumination device and the other is a red illumination device near to the blue illumination device;

(b) disposing a monochrome photoluminescence plate on the radiation path of the blue illumination device, wherein the monochrome is green; and

(c) coupling the blue illumination device and the red illumination device with a power, such that a blue light radiated from the blue illumination device passes through the monochrome photoluminescence plate to excite the bicolor photoluminescence plate and produce a colorful light, and then the colorful light is mixed with a red light radiated from the red LED illumination devices to appear a white light.