ORGANIC ELECTROLUMINESCENCE DEVICE AND LIGHT EMITTING APPARATUS

Abstract

There is provided an organic electroluminescence device including: a pair of electrodes formed of an anode and a cathode; and an organic compound layer provided between the pair of electrodes, in which: the organic compound layer contains a metal so that the metal partially forms a coordination bond with an organic compound; and a ratio of the number of metal atoms involved in the coordination to the total number of metal atoms in the layer is 0.11 or more to 0.42 or less. The organic electroluminescence device has excellent light emitting property that is not largely impaired even after the device is driven for a long time period.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a representative example of the binding energy chart corresponding to an N1s orbital measured by X-ray photoelectron spectroscopy of a film obtained by the co-vapor-deposition of a metal cesium dispenser and a phenanthroline derivative.

FIG. 1B is a representative example of the binding energy chart corresponding to a Cs3d5 orbital measured by X-ray photoelectron spectroscopy of the film obtained by the co-vapor-deposition of the metal cesium dispenser and the phenanthroline derivative.

FIG. 2 is an example of a schematic sectional view of an organic electroluminescence device of the present invention.

FIG. 3 is an example of a schematic sectional view of the organic electroluminescence device of the present invention.

FIG. 4 is a schematic sectional view of an organic electroluminescence device to be produced in each of the examples and comparative examples of the present invention.

Claims

1. An organic electroluminescence device comprising: a pair of electrodes formed of an anode and a cathode; andan organic compound layer provided between the pair of electrodes,wherein:the organic compound layer contains a metal so that the metal partially forms a coordination bond with an organic compound; anda ratio of the number of metal atoms involved in the coordination to the total number of metal atoms in the layer is 0.11 or more to 0.42 or less.

2. The organic electroluminescence device according to claim 1, wherein the ratio of the number of the metal atoms involved in the coordination to the total number of the metal atoms in the layer is 0.22 or more to 0.42 or less.

3. The organic electroluminescence device according to claim 1, wherein the molar ratio of the metal to the organic compound is 0.5 or more to 3.0 or less.

4. The organic electroluminescence device according to claim 1, wherein the metal has an ionization energy of 7 eV or less.

5. The organic electroluminescence device according to claim 1, wherein the metal has an ionization energy of 5 eV or less.

6. The organic electroluminescence device according to claim 1, wherein the organic compound comprises a low-molecular-weight compound.

7. The organic electroluminescence device according to claim 1, wherein the organic compound comprises a phenanthroline derivative.

8. The organic electroluminescence device according to claim 1, wherein the organic compound layer containing the metal is in electrical contact with the cathode.

9. The organic electroluminescence device according to claim 1, wherein the cathode comprises a transparent electrode.

10. The organic electroluminescence device according to claim 1, wherein light is extracted from at least a side of the cathode.

11. A light emitting apparatus comprising a plurality of organic electroluminescence devices each of which comprises the organic electroluminescence device according to claim 1 in its surface.