Red Fluorescence Conversion Medium, Color Conversion Substrate Using Same and Light-Emitting Device

• US 20080252198A1
• Filed: 03/14/2006
• Published: 10/16/2008
• Est. Priority Date: 03/29/2005
• Status: Abandoned Application

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Katano, Junichi, Hosokawa, Chishio, Hachiya, Satoshi
• Application Number:
  US11/910,031
• Publication Number:
  US 20080252198A1
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• 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: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A red fluorescence conversion medium including; a light-transmitting medium, a first perylene fluorescent dye that emits red fluorescence, and a second fluorescent dye that absorbs light in a ultraviolet to blue region to emit fluorescence, wherein the first perylene fluorescent dye absorbs light containing the fluorescence emitted by the second fluorescent dye to emit fluorescence.

Claims

1. A red fluorescence conversion medium comprising;

a light-transmitting medium,

a first perylene fluorescent dye that emits red fluorescence, and

a second fluorescent dye that absorbs light in a ultraviolet to blue region to emit fluorescence,

wherein the first perylene fluorescent dye absorbs light containing the fluorescence emitted by the second fluorescent dye to emit fluorescence.

2. The red fluorescence conversion medium according to claim 1, further comprising a third fluorescent dye of which the absorption edge of light is a longer wavelength than the absorption edge of light of the second fluorescent dye,

wherein the second fluorescent dye and/or the third fluorescent dye are/is a perylene fluorescent dye.

3. The red fluorescence conversion medium according to claim 1 or 2, wherein a relationship between a maximum value of an optical density OD1 in a wavelength region of 600 nm to 700 nm, and a maximum value of an optical density OD2 in a wavelength region of 400 nm to 500 nm is OD2/OD1>

1.5.

4. The red fluorescence conversion medium according to any one of claims 1 to 3, further comprising a light-scatteirng material.

5. A color conversion substrate comprising the red conversion fluorescence medium according to any one of claims 1 to 4 on a transparent substrate.

6. The color conversion substrate according to claim 5, further comprising a green fluorescence medium.

7. A light-emitting apparatus comprising the red fluorescence conversion medium according to any one of claims 1 to 4 and an exciting-light source,

wherein light emitted from the exciting-light source has one or more emission peaks in a wavelength region of 400 nm to 500 nm.

8. The light-emitting apparatus according to claim 7, wherein fluorescence emitted from the red fluorescence conversion medium and light emitted from the exciting-light source are mixed to emit white light.

9. The light-emitting apparatus according to claim 7 or 8, wherein the exciting-light source is a light source converting electric energy to light.

10. The light-emitting apparatus according to claim 7 or 8, wherein the exciting-light source is natural light.

11. A light-emitting apparatus comprising the exciting-light source and the color conversion substrate according to claim 5 or 6.