Organic electroluminescent device

• US 8,092,925 B2
• Filed: 04/25/2006
• Issued: 01/10/2012
• Est. Priority Date: 04/25/2005
• Status: Active Grant

• Current Assignee: UDC Ireland Limited
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Igarashi, Tatsuya, Murakami, Takeshi
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US11/912,470
• Publication Number:
  US 20090039768A1
• Time in Patent Office: 2,086 Days
• Field of Search: None
• US Class Current: 428/690
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1059 containing three nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: C09K 2211/186 of the light metals other than alkali metals and alkaline earth metals, i.e. Be, Al or Mg
• CPC Class Codes: H05B 33/20 characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/341 Transition metal complexes, e.g. Ru(II)polypyridine complexes H10K85/331 takes precedence
• CPC Class Codes: H10K 85/346 comprising platinum
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer including a light emitting layer between the pair of electrodes, wherein the light emitting layer contains a host material and a light emitting material, and wherein the host material contains a metal complex having a tridentate or more ligand.

Claims

1. An organic electroluminescent device comprising:

a pair of electrodes; and

at least one organic compound layer including a light emitting layer between the pair of electrodes,

wherein the light emitting layer contains a host material and a light emitting material, and

wherein the host material contains a metal complex having a quadridentate ligand, which is a compound represented by Formula (2);

2. The organic electroluminescent device according to claim 1, wherein M²¹ represents a metal ion selected from a rhodium ion, a palladium ion, a rhenium ion, an iridium ion and a platinum ion.

3. The organic electroluminescent device according to claim 1,

wherein the light emitting material is a phosphorescent material.

4. The organic electroluminescent device according to claim 1,

wherein a concentration of the host material in the light emitting layer is in a range of from 50 mass % to 99.9 mass %.

5. The organic electroluminescent device according to claim 1,

wherein a concentration of the metal complex having a quadridentate ligand in the light emitting layer is in a range of from 50 mass % to 99.9 mass %.

6. The organic electroluminescent device according to claim 1, wherein the metal ion represented by M²¹ in Formula (2) is one of a platinum ion and a palladium ion.

7. The organic electroluminescent device according to claim 1, wherein a T₁ level (an energy level of the least triplet excited state) of the light emitting material is in a range of 65 Kcal/mol (272.35 KJ/mol) to 80 Kcal/mol (335.2 KJ/mol).

8. The organic electroluminescent device according to claim 1, wherein Q²³ and Q²⁴ are selected from the group consisting of an atom group coordinating with a carbon atom, an atom group coordinating with a nitrogen atom, and an atom group coordinating with an oxygen atom.

9. The organic electroluminescent device according to claim 1, wherein Q²³ and Q²⁴ are selected from the group consisting of an aryl group coordinating with a carbon atom, a heteroaryl group coordinating with a carbon atom, a heteroaryl group coordinating with a nitrogen atom, and a carboxyl group coordinating with an oxygen atom.