ORGANIC ELECTROLUMINESCENT DEVICE

• US 20090039768A1
• Filed: 04/25/2006
• Published: 02/12/2009
• Est. Priority Date: 04/25/2005
• Status: Active Grant

• Current Assignee: UDC Ireland Limited
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Murakami, Takeshi, Igarashi, Tatsuya
• Granted Patent: US 8,092,925 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• 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 tridentate or more ligand.

2. The organic electroluminescent device according to claim 1,

wherein the tridentate or more ligand is a quadridentate ligand.

3. The organic electroluminescent device according to claim 1,

wherein the metal complex contains a metal ion selected from a rhodium ion, a palladium ion, a rhenium ion, an iridium ion and a platinum ion.

4. The organic electroluminescent device according to claim 1,

wherein the metal complex is a compound represented by Formula (1):

represents a metal ion;

Q¹¹, Q¹², Q¹³ and Q¹⁴ each independently represents an atom group coordinating with M¹¹;

L¹², L¹³ and L¹⁴ each independently represents a single bond or a connection group;

n¹¹ represents 0 or 1, provided that when n¹¹ is 0, a bond in which L¹⁴ is interposed between Q¹³ and Q¹⁴ does not exist; and

M¹¹-Q¹¹ bond, M¹¹-Q¹² bond, M¹¹-Q¹³ bond and M¹¹-Q¹⁴ bond each may be a covalent bond, a coordinate bond or an ion bond.

5. The organic electroluminescent device according to claim 4,

wherein the compound represented by Formula (1) is a compound represented by Formula (2):

wherein M²¹ represents a metal ion;

Q²³ and Q²⁴ each independently represents an atom group coordinating with M²¹;

L²² represents a connection group;

R²¹ and R²² each independently represents a substituent group;

m²¹ and m²² each independently represents an integer of from 0 to 3;

M²¹-N bond (dotted line) represents a coordinate bond; and

M²¹-Q²³ bond and M²¹-Q²⁴ bond each may be a covalent bond, a coordinate bond or an ion bond.

6. The organic electroluminescent device according to claim 1,

wherein the light emitting material is a phosphorescent material.

7. The organic electroluminescent device according to claim 1,

wherein the light emitting material contains a metal complex having a quadridentate or more ligand.

8. 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 %.

9. The organic electroluminescent device according to claim 1,

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

10. The organic electroluminescent device according to claim 4,

wherein the metal ion represented by M¹¹ in Formula (1) is one of a platinum ion and a palladium ion.

11. The organic electroluminescent device according to claim 4,

wherein L¹² in Formula (1) represents an alkylene group.

12. The organic electroluminescent device according to claim 5,

wherein L²² in Formula (2) represents one of a dialkyl methylene group, a diarly methylene group and a diheteroaryl methylene group.

13. 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).