LIGHT EMITTING COMPOSITION, LIGHT SOURCE DEVICE, AND DISPLAY DEVICE

• US 20070267965A1
• Filed: 05/02/2007
• Published: 11/22/2007
• Est. Priority Date: 05/16/2006
• Status: Active Grant

• Current Assignee: Dexerials Corporation
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kusunoki, Tsuneo, Igarashi, Takahiro
• Granted Patent: US 7,737,615 B2
• Time in Patent Office: Days
• US Class Current: 313/501
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/7731 with alkaline earth metals
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: Y10T 428/2991 Coated

Abstract

A light emitting composition, light source device, and display device are provided. The light emitting composition has a phosphor, including a glass layer containing at least silicon (Si) and oxygen (O) formed on the surface of the phosphor. Exposed regions of the phosphor are made discrete by the glass layer.

Claims

1. A light emitting composition having a phosphor, comprising:

a glass layer containing at least silicon and oxygen formed on the surface of said phosphor;

wherein exposed regions of said phosphor are made discrete by said glass layer.

2. The light emitting composition according to claim 1, wherein the average thickness of said glass layer is 20 nm or more.

3. The light emitting composition according to claim 1, wherein said phosphor contains an alkaline earth metal sulfide.

4. The light emitting composition according to claim 1, wherein said phosphor is excited by blue light.

5. A light source device comprising:

a first light emitting composition;

a second light emitting composition; and

a blue light source;

wherein at least one of said first light emitting composition and said second light emitting composition has a phosphor to be excited by blue light emitted from said blue light source; and

the surface of said phosphor is coated with a glass layer containing at least silicon and oxygen, exposed regions of said phosphor being made discrete by said glass layer.

6. The light source device according to claim 5, wherein said first light emitting composition has a first phosphor to be excited by blue light emitted from said blue light source;

and said second light emitting composition has a second phosphor to be excited by blue light emitted from said blue light source.

7. A display device comprising:

a light source device having a first light emitting composition, a second light emitting composition, and a blue light source; and

an optical device for performing predetermined modulation to light emitted from said light source device to thereby output predetermined light;

wherein at least one of said first light emitting composition and said second light emitting composition has a phosphor to be excited by blue light emitted from said blue light source; and

the surface of said phosphor is coated with a glass layer containing at least silicon and oxygen, exposed regions of said phosphor being made discrete by said glass layer.

8. The display device according to claim 7, wherein said first light emitting composition has a first phosphor for emitting light in a green region, and said second light emitting composition has a second phosphor for emitting light in a red region.