Organometallic complex, luminescent solid, organic EL element and organic EL display
View Patent ↗An object of the invention is to provide an organic EL element which uses an organometallic complex emitting light by phosphorescence and which represents excellent luminous efficiency, etc; or the like. The organic EL element of the invention includes the organometallic complex, where the organometallic complex includes a metal atom, and a tridentate ligand, where the tridentate ligand binds to the metal atom tridentately via two nitrogen atoms and a carbon atom, and the carbon atom is located between the two nitrogen atoms, and where the tridentate ligand has two azomethine bonds (—C═N—), and each nitrogen atom in the azomethine bonds coordinates to the metal atom. Preferably, in one aspect, the organometallic complex includes a monodentate ligand which binds to the metal atom monodentately, and in another aspect, the metal atom is Pt.
1. An organometallic complex comprising:
a metal atom;
a tridentate ligand
wherein the tridentate ligand binds to the metal atom tridentately via two nitrogen atoms and a carbon atom, and the carbon atom is located between the two nitrogen atoms, and
wherein the tridentate ligand has two azomethine bonds (—C═N—), and each nitrogen atom in the azomethine bonds coordinates to the metal atom; and
further comprising a monodentate ligand which binds to the metal atom monodentately, wherein the monodentate ligand is expressed by the following structural formula (30):
—O—R
where, in the structural formula (30), R represents an aryl group which may have a substituent group.
2. The organometallic complex according to claim 1 , wherein the metal atom is Pt.
3. The organometallic complex according to claim 1 , which is electrically neutral.
4. The organometallic complex according to claim 1 , which exhibits sublimation property in vacuo.
5. The organometallic complex according to claim 1 , which is used in one of an organic EL element and a lighting apparatus.
6. A luminescent solid comprising an organometallic complex, wherein the organometallic complex comprises:
a metal atom; and
a tridentate ligand
wherein the tridentate ligand binds to the metal atom tridentately via two nitrogen atoms and a carbon atom, and the carbon atom is located between the two nitrogen atoms, and
wherein the tridentate ligand has two azomethine bonds (—C═N—), and each nitrogen atom in the azomethine bonds coordinates to the metal atom.
7. An organic EL element comprising:
a positive electrode;
a negative electrode; and
an organic thin layer between the positive electrode and the negative electrode, wherein the organic thin layer comprises an organometallic complex, wherein the organometallic complex comprises:
a metal atom; and
a tridentate ligand
wherein the tridentate ligand binds to the metal atom tridentately via two nitrogen atoms and a carbon atom, and the carbon atom is located between the two nitrogen atoms, and wherein the tridentate ligand has two azomethine bonds (—C═N—), and each nitrogen atom in the azomethine bonds coordinates to the metal atom.
8. The organic EL element according to claim 7 , wherein the organic thin layer comprises a light-emitting layer sandwiched between a hole-transporting layer and an electron-transporting layer, wherein the light-emitting layer comprises the organometallic complex as a light-emitting material.
9. The organic EL element according to claim 8 , wherein the light-emitting layer comprises the organometallic complex alone.
10. The organic EL element according to claim 8 , wherein the light-emitting layer comprises a carbazole derivative expressed by the following structural formula (64):
where, in the structural formula (64), Ar is a divalent or trivalent group containing an aromatic ring, or a divalent or trivalent group containing a heterocyclic aromatic ring;
R 9 and R 10 represent independently a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an alkenyl group, an aryl group, a cyano group, an amino group, an acyl group, an alkoxy carbonyl group, a carboxyl group, an alkoxy group, an alkyl sulfonyl group, a hydroxyl group, an amide group, an aryloxy group, an aromatic hydrocarbon ring or an aromatic heterocyclic group; these may be further substituted by a substituent group; and
n represents an integer of 2 or 3.
11. The organic EL element according to claim 8 , wherein an electrontransporting material contained in the electron-transporting layer is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) expressed by the following structural formula (77):
12. An organic EL display comprising an organic EL element, wherein the organic EL element comprises:
a positive electrode;
negative electrode; and
an organic thin layer between the positive electrode and the negative electrode, wherein the organic thin layer comprises an organometallic complex, wherein the organometallic complex comprises:
a metal atom; and
a tridentate ligand
wherein the tridentate ligand binds to the metal atom tridentately via two nitrogen atoms and a carbon atom, and the carbon atom is located between the two nitrogen atoms, and
wherein the tridentate ligand has two azomethine bonds (—C═N—), and each nitrogen atom in the azomethine bonds coordinates to the metal atom.
13. The organic EL display according to claim 12 , wherein the organic EL display is one of a passive-matrix panel and an active-matrix panel.