White light emitting diode (white LED) and method of manufacturing white LED

• US 7,592,192 B2
• Filed: 02/24/2005
• Issued: 09/22/2009
• Est. Priority Date: 03/05/2004
• Status: Expired due to Fees

• Current Assignee: Konica Minolta Holdings Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Holdings Incorporated (Konica Minolta Inc.)
• Inventors: Wakamatsu, Hideaki, Nabeta, Hiroyuki
• Primary Examiner(s): Ha; Nathan W
• Application Number:
  US10/590,589
• Publication Number:
  US 20070164300A1
• Time in Patent Office: 1,671 Days
• Field of Search: 257 98-100, 257/88, 257/E33.059, 257/E33.061, 257/E23.076, 257 79- 82, 257/E21.002, 438 22- 25
• US Class Current: 438/22
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

Disclosed is a white light emitting diode possessing a phosphor layer to convert blue light into yellow light, provided on a blue light emitting diode, wherein the phosphor layer possesses an inorganic compound containing a phosphor, and particularly a white light emitting diode, wherein this inorganic compound is a phosphor. Also disclosed is a method of manufacturing a white light emitting diode, possessing a step of forming the foregoing phosphor layer made of an inorganic compound containing a phosphor via an aerosol deposition method. A white light emitting diode exhibiting high reliability and longer operating life, which is prepared via use of a blue LED element, can be provided by what is described above.

Claims

1. A method of manufacturing a white light emitting diode comprising a transparent inorganic oxide, and a phosphor layer to convert blue light into yellow light, provided on a blue light emitting diode, the method comprising the steps of:

forming the phosphor layer comprising an inorganic compound containing a phosphor, and

forming the transparent inorganic oxide as an oxide of at least one kind selected from Al, Si, Ti, Ge, P, B, Y, Sn, Pb, Gd, Lu, Sc, In, Mg, Ca, Sr and Ba via an aerosol deposition method by which particles in a vapor phase are deposited on a substrate via collision of the particles with a surface of the substrate in a vacuum.

2. The method of claim 1,

wherein a compound as the phosphor being the inorganic compound is prepared.

3. The method of claim 1,

wherein the transparent inorganic oxide being formed is silica or alumina.

4. The method of claim 1 comprising a film formation rate of 10-30 μ

m/min for the phosphor layer.