Organic EL device

Abstract

An organic EL device includes: a pair of electrodes; and an organic layer sandwiched between the pair of electrodes. The organic layer includes a compound including layer, and the compound including layer includes a compound of 1,3-bis [N,N-bis{(4′-methylbiphen-4-yl)}amino]-5-N,N-bis(4-methylphenyl) aminobenzene. The heat resistance and the vapor deposition property of the organic layer containing the above tertiary amine compound can be improved.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:

FIG. 1 is a cross sectional view showing an organic EL device;

FIG. 2 is a schematic view showing a chemical structure of a starburst tertiary amine compound;

FIG. 3 is a schematic view showing a chemical structure of a compound III;

FIGS. 4A to 4C are schematic views showing chemical structures of compounds IVA to IVC, respectively;

FIGS. 5A to 5D are schematic views showing chemical structures of compounds VA to VD, respectively;

FIG. 6 is a graph showing deposition rate and material temperature in the compound IVC;

FIG. 7 is a graph showing detection intensity of decomposition product and material temperature in the compound IVC;

FIG. 8 is a table showing deposition properties in various compounds; and

FIG. 9 is a table showing emission duration in various samples.

Claims

1. An organic EL device comprising: a pair of electrodes; andan organic layer sandwiched between the pair of electrodes, whereinthe organic layer includes at least one compound including layer, andthe compound including layer includes a compound of:

2. The device according to claim 1, wherein the compound including layer is a light emitting layer, which is made of mixture of a hole transporting material, an electron transporting material and a light emitting additive, andthe compound provides the hole transporting material.

3. The device according to claim 2 wherein the hole transporting material in the light emitting layer has a first ionization potential, and the electron transporting material in the light emitting layer has a second ionization potential, anda difference between the first and second ionization potentials is equal to or larger than 0.35 eV.

4. The device according to claim 2 wherein the electron transporting material is made of a compound of:

5. The device according to claim 2 wherein the compound has a glass transition temperature equal to or larger than 100° C., andthe compound has a decomposition threshold temperature, which is higher than a deposition rate threshold temperature of the compound.

6. The device according to claim 1, wherein the compound including layer is a hole transporting layer, which includes the compound.

7. The device according to claim 1, wherein the compound including layer is a hole injecting layer, which includes the compound.

8. The device according to claim 1, wherein the organic layer includes a hole injection layer, a hole transporting layer, a light emitting layer, an electron transporting layer, and an electron injecting layer, which are stacked in this order, andone of the pair of electrodes contacts the hole injecting layer, and provides an anode, andthe other one of the pair of electrodes contacts the electron injecting layer, and provides a cathode.