White light source

• US 20030227023A1
• Filed: 06/19/2003
• Published: 12/11/2003
• Est. Priority Date: 06/06/2002
• Status: Active Grant

• Current Assignee: Harvatek Corporation
• Original Assignee: Harvatek Corporation
• Inventors: Wang, Bily, Chang, Bill
• Granted Patent: US 6,794,686 B2
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: Y10S 257/918 Light emitting regenerative switching device, e.g. light emitting scr arrays, circuitry

Abstract

A colorless light approaching that of white light in nature, is produced by using no more than two color LEDs covered with one or more layers of complementary color phosphorescent glue on an insulating substrate.

Claims

1. A white light source, comprising:

an insulating substrate;

a green LED and a blue LED mounted on said insulating substrate; and

a red color phosphorescent glue covering said green LED and said blue LED such that the light emitted out from the phosphorescent glue is colorless.

2. A white light source, comprising:

an insulating substrate,

a red LED and a blue LED mounted on said insulating substrate; and

a green color phosphorescent glue covering said red LED and said blue LED such that the light emitted out from the phosphorescent glue is colorless.

3. A white light source comprising:

an insulating substrate;

a blue LED;

a green color phosphorescent glue and a red phosphorescent glue covering said blue LED such that the light emitted from the green color phosphorescent glue and the red color phosphorescent glue is colorless.

4. The white light source as described in claim 3, wherein the red phosphorescent glue and the red phosphorescent glue are mixed.