Organic electroluminescent device

• US 20040137268A1
• Filed: 12/23/2003
• Published: 07/15/2004
• Est. Priority Date: 12/27/2002
• Status: Active Grant

• Current Assignee: UDC Ireland Limited (Universal Display Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Ise, Toshihiro, Igarashi, Tatsuya
• Granted Patent: US 7,211,336 B2
• Time in Patent Office: Days
• US Class Current: 428/690
• 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 2211/186 of the light metals other than alkali metals and alkaline earth metals, i.e. Be, Al or Mg
• CPC Class Codes: C09K 2211/188 of other metals not provided for in one of the previous groups
• 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 85/30 Coordination compounds
• CPC Class Codes: H10K 85/321 Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3]
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/649 Aromatic compounds comprising a hetero atom
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic electroluminescent device comprising: a pair of electrodes; and at least one organic compound layer between the pair of electrodes, the at least one organic compound layer including a light emitting layer, wherein the light emitting layer contains at least one host material and at least one luminescent material, and the host material is a compound represented by the formula (I) as defined herein.

Claims

1. An organic electroluminescent device comprising:

a pair of electrodes; and

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

wherein the light emitting layer contains at least one host material and at least one luminescent material, and the host material is a compound represented by the formula (I);

wherein X¹¹, X¹², X¹³, and X¹⁴ each independently represent a substituted or unsubstituted oxygen atom, a substituted or unsubstituted sulfur atom, a substituted or unsubstituted nitrogen atom, a substituted or unsubstituted carbon atom or a substituted or unsubstituted phosphorus atom;

M¹¹ represents a metal ion;

L¹¹ represents a ligand;

Y¹¹ represents a counter ion;

m¹¹ represents an integer of 1 to 4;

m¹² represents an integer of 0 to 6;

m¹³ represents an integer of 0 to 4; and

the X¹¹-X¹² bond, the X¹²-X¹³ bond, and the X¹³-X¹⁴ bond is a single bond or a double bond;

with the proviso that a compound in which the ligand composed of X¹¹, X¹², X¹³, and X¹⁴ is one derived from an 8-hydroxyquinolinol derivative is excluded.

2. The organic electroluminescent device of claim 1, wherein the luminescent compound is a phosphorescent compound that emits light via a triplet excited state.

3. The organic electroluminescent device of claim 2, wherein the host material and the phosphorescent compound have a T₁ value of 60 kcal/mol or higher, and the phosphorescent compound emits phosphorescence having a peak wavelength of 550 nm or shorter.

4. The organic electroluminescent device of claim 1, wherein the at least one organic compound layer is at least three organic compound layers including a hole transporting layer, a light emitting layer, and an electron transporting layer, and the electron transporting layer has an IP value of 5.9 eV or higher.

5. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by formula (II)

6. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (III):

7. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (IV):

8. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (V):

9. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (VI):

10. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (VII):

11. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (VIII):

12. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (IX):

13. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (X):

14. The organic electroluminescent device of claim 1, wherein the host material is a compound represented by the formula (XI):

15. The organic electroluminescent device of claim 1, wherein the at least one host material is at least two host materials.

16. The organic electroluminescent device of claim 15, wherein at least one of the host materials is an arylamine derivative.

17. The organic electroluminescent device of claim 15, wherein at least one of the host materials is an aromatic hydrocarbon compound.

18. The organic electroluminescent device of claim 15, wherein at least one of the host materials is an aromatic nitrogen-containing heterocyclic compound.

19. The organic electroluminescent device of claim 15, at least one of the host materials is a metal complex other than the compound represented by the formula (I).