Method for manufacturing a triple wavelengths white LED

• US 20050218780A1
• Filed: 05/27/2005
• Published: 10/06/2005
• Est. Priority Date: 09/09/2002
• Status: Abandoned Application

• Current Assignee: Hsing Chen
• Original Assignee: Hsing Chen
• Inventors: Chen, Hsing
• Application Number:
  US11/138,091
• Publication Number:
  US 20050218780A1
• Time in Patent Office: Days
• US Class Current: 313/467
• CPC Class Codes: C09K 11/641 Chalcogenides
• CPC Class Codes: C09K 11/665 with alkali or alkaline earth metals
• CPC Class Codes: C09K 11/7421 with alkaline earth metals
• CPC Class Codes: C09K 11/7706 Aluminates
• CPC Class Codes: C09K 11/77342 Silicates
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials

Abstract

A method for manufacturing a triple wavelengths white LED chooses a blue LED chip whose wavelength is ranged between 430 nm and 480 nm. A red and green mixed phosphor is coated on the blue LED chip. Thus, the red and green mixed phosphor may be excited by the blue LED chip, thereby producing a triple wavelengths white LED.

Claims

1. A method for manufacturing a triple wavelengths white LED, comprising the steps of:

Providing a blue LED chip with a wavelength between 430 nm and 480 nm;

Providing a red phosphor and green phosphor mixed in a proper proportion to form a red and green mixed phosphor;

Providing the red and green mixed phosphor coated on the blue LED chip capable of absorbing blue rays emitted from the blue LED, and emitting red wavelength rays and green wavelength rays;

Mixing the blue wavelength rays, red wavelength rays, and green wavelength rays to produce the triple wavelengths white rays;

The red and green mixed phosphor includes a red phosphor that contains as least a component of Li₂TiO₃;

Mn;

or LiALO₂Mn;

or 6MgO.As₂O₅;

Mn⁴⁺;

or 3.5MgO.0.5MgF₂.GeO₂;

Mn⁴⁺; and

The red and green mixed phosphor includes a green phosphor that contains as least a component of Y₃(Ga_xAL_1-x)₅O₁₂;

Ce (0x1;

or La₂O₃.11Al₂O₃;

Mn;

or Ca₈Mg(SiO₄)₄Cl₂;

Eu, Mn.

2. The method for manufacturing a triple wavelengths white LED according to claim 1, wherein the red phosphor and the green phosphor are mixed in a proper proportion to form a red and green phosphor which is mixed with a transparent resin in a proper proportion to form a gum of the red and green mixed phosphor.

3. The method for manufacturing a triple wavelengths white LED according to claim 1, wherein the red and green phosphor is directly or indirectly coated on the blue LED chip in a coating or printing matter.

4. The method for manufacturing a triple wavelengths white LED according to claim 1, wherein the percentage of the red phosphor is 60-85 percent, the percentage of the green phosphor is 15-40 percent.