Fluorescence conversion medium and display device comprising it

• US 6,464,898 B1
• Filed: 07/20/2000
• Issued: 10/15/2002
• Est. Priority Date: 11/20/1998
• Status: Expired due to Term

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Ishikawa, Motoharu, Eida, Mitsuru, Tomoike, Kazuhiro
• Primary Examiner(s): Koslow, C. Melissa
• Application Number:
  US09/582,215
• Time in Patent Office: 817 Days
• Field of Search: 252/301.35, 428/690, 313/501
• US Class Current: 252/301.35
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

Provided are a fluorescence conversion medium which comprises at least a fluorescent coloring matter and a binder resin and which can absorb light from a light emitter and can emit visible fluorescence, wherein fine particles containing the fluorescent coloring matter are dispersed in the binder resin; and a display device that comprises a light emitter and the fluorescence conversion medium. The fluorescence conversion medium (including fluorescence conversion films) has the advantages of stable fluorescence conversion capability, good heat resistance and good light resistance and favorable to high-resolution multi-color image display; and the display device comprises the fluorescence conversion medium.

Claims

1. A fluorescence conversion medium comprising fine particles containing a fluorescent coloring matter dispersed in a binder resin the fluorescence conversion medium being capable of absorbing light from a light emitter to emit visible fluorescence, wherein the fine particles contain the fluorescent coloring matter in such a manner that the fluorescent coloring matter is physically adsorbed or chemically bonded to the surfaces of the fine particles.

2. The fluorescence conversion medium as claimed in claim 1, wherein the fluorescence coloring matter-containing fine particles have a glass transition temperature of not lower than 80°

C.

5. The fluorescence conversion medium as claimed in claim 1, wherein the light emitter is an organic electroluminescent device.

6. A display device comprising a light emitter and the fluorescence conversion medium of claim 1.

7. The display device as claimed in claim 6, wherein the light emitter is an organic electroluminescent device.

3. A fluorescence conversion medium comprising fine particles containing a fluorescent coloring matter dispersed in a binder resin the fluorescence conversion medium being capable of absorbing light from a light emitter to emit visible fluorescence, wherein the fine particles contain at least one member selected from the group consisting of an UV absorbent and light stabilizers.

4. A fluorescence conversion medium comprising particles containing a fluorescent coloring matter dispersed in a binder resin the fluorescence conversion medium being capable of absorbing light from a light emitter to emit visible fluorescence, wherein the fluorescence coloring matter-containing fine particles have an UV absorbent layer or a light stabilizer layer on their surfaces.

8. A fluorcscence conversion medium comprising fine particles containing a fluorescent coloring matter dispersed in a binder resin, the fluorescence conversion medium being capable of absorbing light from a light emitter to emit visible fluorescence, wherein the fine particles contain the fluorescent coloring matter in such a manner that all the fluorescent coloring matter is embedded or included inside the fine particles, and at least 80% by weight of all the fluorescent coloring matter-containing fine particles have size of at most 500 nm.