Phosphor plate and light emitting device having same

• US 20070120463A1
• Filed: 10/17/2006
• Published: 05/31/2007
• Est. Priority Date: 10/26/2005
• Status: Abandoned Application

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Kato, Hideaki, Hayashi, Toshimasa, Kawaguchi, Hiroaki, Narita, Takumi
• Application Number:
  US11/581,751
• Publication Number:
  US 20070120463A1
• Time in Patent Office: Days
• US Class Current: 313/501
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• 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 33/486 adapted for surface mounting
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder

Abstract

A phosphor plate has a wavelength conversion plate member formed of a base material with a phosphor included therein. The phosphor is operable to radiate a wavelength-converted light by being excited by a light emitted from a light emitting element. The base material further has a converter of light travel direction.

Claims

1. A phosphor plate, comprising:

a wavelength conversion plate member comprising a base material comprising a phosphor, the phosphor being operable to radiate a wavelength-converted light by being excited by a light emitted from a light emitting element,

wherein the base material further comprises a converter of light travel direction.

2. The phosphor plate according to claim 1, wherein:

the converter comprises a refractive index of n1,

the base material comprises a refractive index of n2, and

n1≦

n2 is satisfied.

3. The phosphor plate according to claim 1, wherein:

the light emitting element comprises a light emitting diode element.

4. The phosphor plate according to claim 1, wherein:

the phosphor comprises a phosphor to radiate a white light from a light output surface of the plate member.

5. The phosphor plate according to claim 1, wherein:

the converter comprises an air bubble.

6. The phosphor plate according to claim 1, wherein:

the converter comprises an particle.

7. A light emitting device, comprising:

a case comprising an internal space opened on a light extraction side thereof;

the phosphor plate as defined in claim 1;

a light emitting element housed in the case and disposed on an opposite side to the light extraction side of the case,

wherein the phosphor plate is disposed on the light extraction side of the case.