Fluorescent complex and lighting system using the same

• US 20070007884A1
• Filed: 06/20/2006
• Published: 01/11/2007
• Est. Priority Date: 06/21/2005
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Aiga, Fumihiko, Amano, Akio, Iwanaga, Hiroki
• Granted Patent: US 7,902,741 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: C07D 209/82 Carbazoles; Hydrogenated carbazoles
• CPC Class Codes: C07D 249/08 1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
• CPC Class Codes: C07D 515/08 Bridged systems
• CPC Class Codes: C07F 5/003 without C-Metal linkages
• CPC Class Codes: C07F 9/65685 the ring phosphorus atom being part of a phosphine oxide or thioxide
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/1048 with oxygen
• CPC Class Codes: C09K 2211/1051 with sulfur
• CPC Class Codes: C09K 2211/1096 containing other heteroatoms
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• 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

Abstract

Disclosed are a fluorescent complex comprising a rare earth atom and a ligand having a structure comprising a plurality of coordinating groups bonded to each other in a ring form, and a lighting system and a flashlight device using the same. This fluorescent complex can realize high-intensity fluorescence and a prolonged service life and gives a sharp fluorescence spectrum.

Claims

1. A fluorescent complex comprising a rare earth atom and at least one cyclic multidentate ligand coordinated to the rare earth atom, said cyclic multidentate ligand having a structure in which a plurality of coordinating groups are bonded to each other in a ring form.

2. The fluorescent complex according to claim 1, wherein said coordinating group has at least one structure selected from the group consisting of P=O, S=O, O=S=O, and C=O and is coordinated to said rare earth atom.

3. The fluorescent complex according to claim 1, wherein said coordinating group has a nitrogen atom or a selenium atom and is coordinated to said rare earth atom.

4. The fluorescent complex according to claim 1, wherein said cyclic multidentate ligand contains two or more coordinating groups.

5. The fluorescent complex according to claim 1, which comprises a rare earth atom and two or more types of cyclic multidentate ligands.

6. The fluorescent complex according to claim 1, which further comprises another ligand which has a different structure from said cyclic multidentate ligand.

7. The fluorescent complex according to claim 1, wherein said cyclic multidentate ligand has a structure represented by formula (A)

8. The fluorescent complex according to claim 7, wherein m3 is 0 (zero).

9. The fluorescent complex according to claim 8, wherein said cyclic multidentate ligand has a structure selected from formulae (A1) to (A3):

10. The fluorescent complex according to claim 1, wherein said plurality of cyclic multidentate ligands are mutually bonded.

11. The fluorescent complex according to claim 1, wherein said rare earth atom is a europium atom.

12. A electroluminescent element comprising a cathode, an organic light emitting layer, and anode, wherein the organic light emitting layer comprising the fluorescent complex according to claim 1.

13. A lighting system comprising a light emitting element having a light emitting face and a fluorescent layer disposed on or above said light emitting element on the side of the light emitting faces, said fluorescent layer comprising the fluorescent complex according to claim 1.

14. A camera comprising as a flashlight device a lighting system comprising a light emitting element having a light emitting face and a fluorescent layer disposed on or above said light emitting element on the side of the light emitting face, said fluorescent layer comprising the fluorescent complex according to claim 1.

15. A cellular phone with a camera, the camera comprising as a flashlight device a lighting system comprising a light emitting having a light emitting face element and a fluorescent layer disposed on or above said light emitting element on the side of the light emitting face, said fluorescent layer comprising the fluorescent complex according to claim 1.