Organic electroluminescent element

• US 20080079358A1
• Filed: 09/21/2007
• Published: 04/03/2008
• Est. Priority Date: 09/29/2006
• Status: Abandoned Application

• Current Assignee: UDC Ireland Limited (Universal Display Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Satou, Tasuku
• Application Number:
  US11/902,459
• Publication Number:
  US 20080079358A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• 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 2211/1059 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: 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 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 85/342 comprising iridium
• CPC Class Codes: H10K 85/346 comprising platinum

Abstract

An organic electroluminescent element including at least one organic layer including a light-emitting layer between a pair of electrodes, wherein the light-emitting layer includes a metal complex having a tri-dentate or higher multi-dentate ligand, and a metal-free compound capable of giving a three or higher coordination with the same metal element as a central metal of the metal complex is provided. An organic electroluminescent element having a high light emitting efficiency and excellent durability is provided.

Claims

1. An organic electroluminescent element comprising at least one organic layer including a light-emitting layer between a pair of electrodes, wherein the light-emitting layer includes a metal complex having a tri-dentate or higher multi-dentate ligand, and a metal-free compound capable of giving a three or higher coordination with the same metal element as a central metal of the metal complex.

2. The organic electroluminescent element according to claim 1, wherein the coordination number of the metal-free compound is same as the coordination number of the metal complex.

3. The organic electroluminescent element according to claim 2, wherein the metal-free compound has, as a partial structure, a chemical structure in which metal is removed from the metal complex.

4. The organic electroluminescent element according to claim 1, wherein the metal-free compound is a linear compound.

5. The organic electroluminescent element according to claim 4, wherein the metal complex is a compound represented by the following formula LA1, and the linear compound is a compound represented by the following formula LA2:

wherein M¹¹ represents a metal ion;

Q¹¹ to Q¹⁴ each independently represent a substituent which coordinates with M¹¹;

L¹¹ and L¹² each independently represent a single bond or a linking group; and

n represents an integer of from 0 to 4;

wherein Q¹¹ to Q¹³ and L¹¹ and L¹² are each a group having the same skeleton structure as that of the formula LA1, and may independently have a substituent.

6. The organic electroluminescent element according to claim 4, wherein the metal complex is a compound represented by the following formula LA3, and the linear compound is a compound represented by the following formula LA4:

wherein M²¹ represents a metal ion;

Q²¹ to Q²⁵ each independently represent a substitutent which coordinates with M²¹;

L²¹ to L²³ each independently represent a single bond or a linking group; and

n represents an integer of from 0 to 4;

wherein Q²¹ to Q²⁴ and L²¹ to L²³ are each a group having the same skeleton structure as that of the formula LA3, and may independently have a substituent.

7. The organic electroluminescent element according to claim 4, wherein the metal complex is a compound represented by the following formula LA5, and the linear compound is a compound represented by the following formula LA6:

wherein M³¹ represents a metal ion;

Q³¹ to Q³⁷ each independently represent a substituent which coordinates with M³¹;

L³¹ to L³⁵ each independently represent a single bond or a linking group; and

n31 and n32 each independently represent an integer of from 0 to 4;

wherein Q³¹ to Q³⁶ and L³¹ to L³⁵ are each a group having the same skeleton structure as that of the formula LA5, and may independently have a substituent.

8. The organic electroluminescent element according to claim 4, wherein the metal complex is a compound represented by the following formula LA7, and the linear compound is a compound represented by the following formula LA8:

wherein M⁴¹ represents a metal ion;

Q⁴¹ to Q⁴⁷ each independently represent a substituent which coordinates with M⁴¹;

L⁴¹ to L⁴⁴ each independently represent a single bond or a linking group; and

n41 and n42 each independently represent an integer of from 0 to 4;

wherein Q⁴¹ to Q⁴⁶ and L⁴¹ to L⁴⁴ are each a group having the same skeleton structure as that of the formula LA7, and may independently have a substituent.