Organic electroluminescent element and the manufacturing method

Abstract

A manufacturing method of an organic electroluminescent element is provided. The method includes forming an insulator layer between pattern-formed pixel electrodes on a substrate, and forming a hole transport layer by printing hole transport ink, having a hole transport material dissolved in a solvent, on the pixel electrodes between the insulator layers by relief printing, wherein the hole transport ink includes 3,4-polyethylen dihydroxy thiophen (PEDOT), and monohydric alcohol and dihydric alcohol as solvents.

Description

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view which shows structure of an organic electroluminescent panel including an organic electroluminescent element of an embodiment of the present invention.

FIG. 2 is a schematic diagram of a relief printing apparatus used in the present invention.

FIG. 3 is an estimation result of an organic electroluminescent display panel of examples and comparative examples.

Claims

1. A manufacturing method of an organic electroluminescent element including pixel electrodes, cathode(s) and an organic luminescent medium layer including an organic luminescent layer and an hole transport layer, said method includingforming an insulator layer between pattern shaped pixel electrodes on a substrate, and forming a hole transport layer on the pixel electrodes between insulator layers by relief printing hole transport ink,wherein said hole transport ink includes 3,4-polyethylen dihydroxy thiophen (PEDOT), monohydric alcohol and dihydric alcohol, andwherein a total of the weight fraction of the monohydric alcohol and the dihydric alcohol in the hole transport ink is 5%-50%.

2. The manufacturing method of an organic electroluminescent element according to claim 1, wherein boiling points of the monohydric alcohol and the dihydric alcohol are equal to or less than 200 degrees Celsius at atmospheric pressure.

3. The manufacturing method of an organic electroluminescent element according to claim 1, wherein a contact angle between face of a relief printing plate and hole transport ink is 15-45 degrees.

4. An organic electroluminescent element including pixel electrodes, cathode(s) and an organic luminescent medium layer including an organic luminescent layer and a hole transport layer, said element includesan insulator layer between pattern shaped pixel electrodes on a substrate, anda hole transport layer on the pixel electrodes between insulator layers,wherein the hole transport layer is formed by relief printing hole transport ink,wherein the hole transport ink includes 3,4-polyethylen dihydroxy thiophen (PEDOT), monohydric alcohol and dihydric alcohol, andwherein a total of the weight fraction of the monohydric alcohol and the dihydric alcohol in the hole transport ink is 5%-50%.

5. The organic electroluminescent element according to claim 4, wherein boiling points of the monohydric alcohol and the dihydric alcohol are equal to or less than 200 degrees Celsius at atmospheric pressure.

6. The organic electroluminescent element according to claim 4, wherein a contact angle between face of a relief printing plate and hole transport ink is 15-45 degrees.