Light emitting device

• US 7,207,691 B2
• Filed: 06/04/2004
• Issued: 04/24/2007
• Est. Priority Date: 11/27/2003
• Status: Expired due to Fees

• Current Assignee: Jung-Pin Cheng, Kun-Chui Lee, Tzu-Chi Cheng
• Original Assignee: Jung-Pin Cheng, Kun-Chui Lee, Tzu-Chi Cheng
• Inventors: Cheng, Tzu-Chi, Cheng, Jung-Pin, Lee, Kun-Chui
• Primary Examiner(s): Sember; Thomas M.
• Assistant Examiner(s): Rehm; Adam C.
• Application Number:
  US10/860,151
• Publication Number:
  US 20050117334A1
• Time in Patent Office: 1,054 Days
• Field of Search: 362/84, 362230-231, 362/242, 362/244, 362/246, 362/800
• US Class Current: 362/231
• 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 33/50 Wavelength conversion elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A light emitting device including three light emitting sources and a phosphor, with the three light sources consisted of following light emitting diodes (LED) emitting lights having different wavelengths. Wherein, two light sources are used to excite the phosphor to produce a distinct wavelength different from those of the two light sources. The distinct wavelength is blended with portions of the two light sources and a light source from another independent light source, and a blended light is released to obtain a white light.

Claims

1. A light emitting device comprising:

three light emitting sources and a phosphor, with the three light sources consisting of light emitting diodes (LED) emitting lights having different wavelength;

wherein;

a first light source is formed by at least one first LED capable of emitting a blue light having a wavelength ranging between 360 nm and 480 nm;

a second light source is formed by at least one second LED capable of emitted a blue to green light having a wavelength ranging between 480 nm and 570 nm;

a third light source is formed by at least one third LED capable of emitting a red light having a wavelength ranging between 585 nm and 780 nm;

wherein the phosphor is BxOy³;

and a phosphor is for absorbing lights having different wavelengths and emitted by the first and second light sources, and is excited to emit a distinct light having a wavelength distinct from those of the first and second light sources;

wherein, the distinct light is blended with the red light emitted from the third light source and the lights emitted from the first and second light sources producing a blended light to obtain a white light;

the distinct light has a wavelength between 500 nm and 585 nm.