LIGHT EMITTING DIODE

• US 20090152582A1
• Filed: 09/30/2008
• Published: 06/18/2009
• Est. Priority Date: 12/12/2007
• Status: Active Grant

• Current Assignee: Foxsemicon Integrated Technology Incorporated
• Original Assignee: Foxsemicon Integrated Technology Incorporated
• Inventors: CHANG, CHUNG-MIN, HSU, CHIH-PENG, WANG, CHUN-WEI
• Granted Patent: US 7,728,344 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/181 Encapsulation
• CPC Class Codes: H01L 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/54 having a particular shape

Abstract

A light emitting diode includes a reflective cup, an LED chip, and many electrodes, a first light scattering layer, and a phosphor layer. The reflective cup includes a bottom and a sidewall extending from the bottom. The LED chip is received in the reflective cup and mounted on the bottom thereof for emitting first light of a first wavelength. The electrodes each has a first end electrically connected to the LED chip and an opposite second end exposed at an outer surface of the reflective cup. The first light scattering layer formed in the reflective cup on the bottom thereof and covering the LED chip, which has a concave surface at an opposite side thereof to the LED chip. The phosphor layer formed on the concave surface of the light scattering layer for converting part of the first light into second light of a second wavelength.

Claims

1. A light emitting diode comprising:

a reflective cup comprising a bottom and a sidewall extending from the bottom, the sidewall comprising an inner reflective surface;

an LED chip received in the reflective cup and mounted on the bottom thereof, the LED chip being configured for emitting first light of a first wavelength;

a plurality of electrodes having first ends electrically connected to the LED chip and opposite second ends exposed at an outer surface of the reflective cup;

a first light scattering layer comprising a first light pervious matrix and a plurality of light scattering particles dispersed therein, the first light scattering layer formed in the reflective cup on the bottom thereof and covering the LED chip, the first light scattering layer having a concave surface at an opposite side thereof to the LED chip, the first light scattering layer being configured for scattering the first light; and

a phosphor layer comprising a second light pervious matrix and phosphor particles dispersed therein, the phosphor layer formed on the concave surface of the light scattering layer, the phosphor layer being configured for converting part of the first light into second light of a second wavelength.

2. The light emitting diode of claim 1, wherein the bottom and the sidewall are integrally formed.

3. The light emitting diode of claim 1, wherein the reflective cup defines a frustoconic receiving space with the LED chip and the light scattering layer received therein.

4. The light emitting diode of claim 1, wherein a refractive index of the second matrix is greater than or equal to that of the first light pervious matrix.

5. The light emitting diode of claim 1, wherein a minimum distance between the concave surface of the first light scattering layer and the LED chip is greater than or equal to 50 microns.

6. The light emitting diode of claim 1, wherein the phosphor layer having a convex light emitting surface at an opposite side thereof to the first light scattering layer.

7. The light emitting diode of claim 1, wherein the phosphor layer having a concave light emitting surface at an opposite side thereof to the first light scattering layer.

8. The light emitting diode of claim 1, wherein the phosphor layer comprises a flat light emitting surface at an opposite side thereof to the first light scattering layer.

9. The light emitting diode of claim 1, further comprising a second light scattering layer formed on an opposite side of the phosphor layer to the first scattering layer, the second light scattering layer comprising a plurality of light scattering particles dispersed therein.

10. The light emitting diode of claim 9, wherein the second scattering layer has a convex light emitting surface facing away from the phosphor layer.

11. The light emitting diode of claim 9, wherein the second light scattering layer comprises a flat surface at an opposite side thereof to the phosphor layer.