Method for adjusting the hue of the light emitted by a light-emitting diode

• US 20020171911A1
• Filed: 05/16/2002
• Published: 11/21/2002
• Est. Priority Date: 05/17/2001
• Status: Abandoned Application

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Maegawa, Mamoru
• Application Number:
  US10/146,050
• Publication Number:
  US 20020171911A1
• Time in Patent Office: Days
• US Class Current: 359/308
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

In a light-emitting diode, a phosphor layer 6 containing a phosphor is laid on top of translucent sealing resin 8 having a light-emitting diode element 3 sealed in it, and then, by shaving the phosphor layer 6, the hue of the light emitted by the light-emitting diode is adjusted. This makes it possible to adjust the hue of the light emitted by individual light-emitting diodes to obtain a uniform hue. For quick and easy adjustment of the hue, the phosphor layer 6 is shaved preferably by laser beam machining.

Claims

1. A method for adjusting a hue of light emitted by a light-emitting diode, comprising the steps of:

laying a phosphor layer containing a phosphor on top of a translucent sealing resin having a light-emitting diode element sealed therein; and

adjusting a hue of emitted light by shaving the phosphor layer.

2. A method for adjusting a hue of light emitted by a light-emitting diode as claimed in claim 1,

wherein the phosphor layer is shaved by laser beam machining.

3. A method for adjusting a hue of light emitted by a light-emitting diode as claimed in claim 1,

wherein the method is used to adjust a hue of light emitted by a white light-emitting diode.

4. A method for adjusting a hue of light emitted by a light-emitting diode as claimed in claim 3,

wherein the light-emitting diode is based on GaN, and the phosphor is based on YAG activated by cerium.

5. A method for adjusting a hue of light emitted by a light-emitting diode as claimed in claim 1,

wherein the phosphor layer has a thickness in a range from 100 to 500 μ

m.