Light emitting diode

• US 6,744,194 B2
• Filed: 09/17/2001
• Issued: 06/01/2004
• Est. Priority Date: 09/29/2000
• Status: Active Grant

• Current Assignee: Citizen Electronics Company Limited
• Original Assignee: Citizen Electronics Company Limited
• Inventors: Fukasawa, Koichi, Ishii, Hirohiko
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Krishnan, Sumati
• Application Number:
  US09/953,302
• Publication Number:
  US 20020039002A1
• Time in Patent Office: 988 Days
• Field of Search: 313/486, 313/467, 252/301.6 P
• US Class Current: 313/486
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48237 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• 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 2924/00014 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 2933/0091 Scattering means in or on the semiconductor body or semiconductor body package H01L33/22 takes precedence
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/502 Wavelength conversion materials

Abstract

A light emitting diode is disclosed which is small and inexpensive and can emit a variety of intermediate colors of light with a single light emitting element chip and whose current consumption is small. This invention provides a light emitting diode which comprises: a substrate; electrodes formed on the substrate; a light emitting element chip connected to the electrodes and mounted on an upper surface of the substrate; a resin material sealing an upper surface side of the light emitting element chip; and fluorescent particles and coloring particles scatteringly distributed in the resin material. The coloring particles absorb a part of wavelengths of light from the light emitting element chip and a part of wavelengths of light that have been changed by the fluorescent particles.

Claims

1. A light emitting diode comprising:

a substrate;

electrodes formed on said substrate;

a light emitting element chip connected to said electrodes and mounted through a bonding agent on an upper surface of said substrate;

a resin material for sealing an upper surface side of said light emitting element chip; and

fluorescent particles and at least two different coloring particles contained in said resin material,

wherein said coloring particles are dyes selected from the group consisting of phthalocyanine, anthraquinone, azo and quinophthalone compounds capable of producing intermediate colors in combination thereof,

wherein said coloring particles are capable of absorbing a portion of wavelengths of light in which the wavelengths are converted by the fluorescent particles to emit light of an intermediate color.

2. A light emitting diode according to claim 1, wherein said fluorescent particles are made from yttrium aluminum garnet (YAG).

3. A light emitting diode according to claim 1, wherein said light emitting element chip is a blue light emitting diode element made from a gallium nitride compound semiconductor.

4. A light emitting diode according to claim 1, wherein said fluorescent particles and said coloring particles are contained in said bonding agent for mounting the light emitting element chip.

5. The light emitting diode of claim 1, wherein said coloring particles comprise different particles for producing red, blue and green.

6. The light emitting diode of claim 1, wherein said coloring particles comprise different particles of all of said phthalocyanine, anthraquinone, azo and quinophthalone compounds.