Organometallic complex and organic electroluminescence device using the same

Abstract

Provided are an organometallic complex providing highly efficient phosphorescence and an organic electroluminescence device using the organometallic complex represented by Formula 1: MLmL′n where M is Ir, Os, Pt, Pb, Re, Ru or Pd, L and L′ are different bidentate ligands, m is 1, 2 or 3, and n is 3−m. The organometallic complex can be used to form an organic layer of the organic electroluminescence device, efficiently emits light of a wavelength corresponding to red light, and has high brightness and low operating voltage.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein:

FIGS. 1A through 1F are diagrams schematically illustrating various laminated structures of an organic electroluminescent device according to embodiments of the present invention; and

FIG. 2 is a diagram illustrating an organic electroluminescent device manufactured according to the present invention.

Claims

1. An organometallic complex represented by Formula 1: MLmL′n   (1)where M is Ir, Os, Pt, Pb, Re, Ru or Pd;L and L′ are different bidentate ligands;m is 1, 2 or 3;n is 3−m; andMLm of Formula 1 is represented by Formula 2;

2. The organometallic complex of claim 1, wherein M is one of Ir and Pt.

3. The organometallic complex of claim 1, wherein A and B are a C3-C60 bicyclic or tricyclic aromatic fused ring structure having at least one hetero atom.

4. The organometallic complex of claim 1, wherein the MLm is represented by one of Formulas 3 through 9:

5. The organometallic complex of claim 1, wherein the bidentate ligand L′ is represented by Formulas 11 through 19:

6. The organometallic complex of claim 1, wherein the compound represented by Formula 1 is represented by one of Formula 21 through Formula 28:

7. An organic electroluminescence device having an organic layer formed of the organometallic complex of claim 1.

8. An organometallic complex represented by Formula 1: MLmL′n   (1)where M is Ir, Os, Pt, Pb, Re, Ru or Pd;L and L′ are different bidentate ligands;m is 1, 2 or 3;n is 3−m;MLm of Formula 1 is represented by one of Formulas 3 through 9:

9. The organometallic complex of claim 8, wherein M is Ir or Pt, and A and B are a C3-C60 bicyclic or tricyclic aromatic fused ring structure having at least one hetero atom.

10. An organic electroluminescence device having an organic layer formed of the organometallic complex of claim 8.

11. An organic electroluminescence device, comprising: a pair of electrodes; andan organic layer interposed between the pair of electrodes, the organic layer comprising an organometallic complex represented by Formula 1: MLmL′n   (1)where M is Ir, Os, Pt, Pb, Re, Ru or Pd;L and L′ are different bidentate ligands;m is 1, 2 or 3;n is 3−m; andMLm of Formula 1 is represented by Formula 2;

12. The organic electroluminescence device of claim 11, wherein the organic layer is a light emitting layer.

13. The organic electroluminescence device of claim 12, wherein the organometallic complex is in an amount of 1 to 30 parts by weight based on 100 parts by weight of materials used to form the light emitting layer.

14. The organic electroluminescence device of claim 11, wherein the organic layer further comprises one of green phosphorescent materials or blue phosphorescent materials.

15. The organic electroluminescence device of claim 11, wherein M is one of Ir and Pt.

16. The organic electroluminescence device of claim 11, wherein A and B are a C3-C60 bicyclic or tricyclic aromatic fused ring structure having at least one hetero atom.

17. The organic electroluminescence device of claim 11, wherein the MLm is represented by one of Formulas 3 through 9:

18. The organic electroluminescence device of claim 11, wherein the bidentate ligand L′ is represented by Formulas 11 through 19:

19. The organic electroluminescence device of claim 11, wherein the compound represented by Formula 1 is represented by one of Formula 21 through Formula 28:

20. The organic electroluminescence device of claim 11, wherein the organic layer further comprises at least one host selected from the group consisting of a polymer host, a mixture host comprising a polymer and a small molecule, a small molecule host, and a non-emitting polymer matrix.