ORGANIC EL COMPONENT

Abstract

An organic EL element includes a positive electrode layer, a hole injection layer, a hole transport layer, a light emitting portion, an electron transport layer, an electron injection layer, and a negative electrode layer laminated on a substrate. The light emitting portion has three first light emitting layers, three hole transport layers, and a second light emitting layer. The three first light emitting layers and the three layer hole transport layers are alternately laminated. The organic EL element is capable of enhancing luminous efficiency and minimizing the attenuation of the luminous efficiency and luminance.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a sectional structure of an organic EL element according to a preferred embodiment of the present invention.

FIG. 2 shows a sectional structure of an organic EL element for comparison.

FIG. 3 is a graph showing the relationship between luminous efficiency and time.

FIG. 4 is a graph showing the attenuation of the luminance of the organic EL element according to a preferred embodiment of the present invention and other organic EL elements for comparison.

Claims

1. An organic EL element comprising: a light emitting portion including: a plurality of light emitting layers made of a light emitting material; anda plurality of charge transport layers made of a charge transporting material capable of smoothly moving either positive or negative charges; whereinthe plurality of light emitting layers and charge transporting layers are alternately laminated.

2. The organic EL element according to claim 1, wherein the light emitting material defining the light emitting layer contains trisaluminum (Alq3).

3. The organic EL element according to claim 1, wherein the charge transport layer is made of a hole transporting material capable of smoothly moving a hole.

4. The organic EL element according to claim 3, wherein the hole transporting material defining the charge transport layer contains naftelphenylbenzine (NPB).

5. The organic EL element according to claim 2, wherein the charge transporting layer is made of a hole transporting material capable of smoothly moving a hole.

6. The organic EL element according to claim 1, wherein the plurality of light emitting layers and charge transporting layers includes at least three light emitting layers and at least three charge transporting layers.

7. The organic EL element according to claim 1, wherein the plurality of light emitting layers includes a plurality of first light emitting layers and a second light emitting layer, wherein the second light emitting layer is thicker than each of the first light emitting layers.