Method of manufacturing OLED element and an OLED element

Patent metadata

Field	Value
Publication number	US-10297796-B2
Application number	US-201715743396-A
Country	US
Kind code	B2
Filing date	Nov 14, 2017
Priority date	Oct 18, 2017
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

An OLED element and a method of manufacturing thereof are provided. The method of manufacturing OLED element includes step S1, sequentially depositing a hole injection layer, a hole transport layer, an emission layer, an electron transport layer and an electron injection layer and a first cathode on an anode; step S2, forming sub-pixels corresponding to each of the emission layers and an organic material layer for adjusting microcavity effect by photolithography; step S3, depositing a second cathode on the organic material layer. The disclosure provides a manufacture which adds conducting organic material layer between two cathodes by photolithography which is not effect to OLED material. According to adjust thickness of layer to enhance microcavity effect, the photolithography is different than the photolithography of manufacture CF and anode, it doesn't need fine metal mask, which save cost and time of manufacture OLED and enhance process efficiency.

First claim

What is claimed is:

1. A method of manufacturing OLED element, comprising
step S 1 , sequentially depositing a hole injection layer, a hole transport layer, an emission layer, an electron transport layer and an electron injection layer and a first cathode on an anode;
step S 2 , forming an organic material layer corresponding to each of sub-pixels of the emission layers so as to adjust microcavity effect by photolithography;
step S 3 , depositing a second cathode on the organic material layer;
wherein the specifically step S 2 comprising
step S 21 , coating a negative photoresist compatible with organic material on the first cathode;
step S 22 , positioning a photo mask on correspondingly position of the sub-pixel of emission layer, exposing to developing the negative photoresist by the photo mask;
step S 23 , depositing the organic material layer for adjusting microcavity effect on the position of the negative photoresist which is washed away by the developer solution and a remaining negative photoresist;
step S 24 , peeling the remaining negative photoresist and the organic material layer positioned above thereon, and obtaining a remaining organic material layer is corresponding to the sub-pixel of the emission layer;
step S 25 , repeating the steps S 21 -S 24 until obtaining the remaining organic material layer which corresponding to each of the sub-pixels of the emission layer.

2. The method of manufacturing OLED element according to claim 1 , wherein the negative photoresist contains carbon chain structure having at least a fluoro-containing group.

3. The method of manufacturing OLED element according to claim 1 , wherein the negative photoresist comprising photosensitive components, the photosensitive components include halogen-containing solvent, photoacid generator compound, at least a monomer contains fluoro-containing group and at least a copolymer contains acid-hydrolyzable ester-containing group.

4. The method of manufacturing OLED element according to claim 3 , wherein halogen reagent is hydrofluoroether or segregated hydrofluoroether, the copolymer is random copolymer.

5. An OLED element, comprising
an anode, and a hole injection layer, a hole transport layer, an emission layer, an electron transport layer and an electron injection layer and a first cathode are sequentially deposited on the anode;
an organic material layer is formed corresponding to each of sub-pixels of the emission layer so as to adjust microcavity effect on the first cathode by photolithography; and
a second cathode is deposited and formed on the organic material layer;
wherein the organic material layer is formed by following process positioning a photo mask on correspondingly position of the sub-pixel of emission layer, exposing to developing a negative photoresist by the photo mask;
depositing the organic material layer for adjusting microcavity effect on position of the negative photoresist which is washed away by the developer solution and a remaining negative photoresist;
peeling the remaining negative photoresist and the organic material layer positioned above thereon, and obtaining the organic material layer is corresponding to the sub-pixel of the emission layer; and
repeating the above steps until obtaining the organic material layer which corresponding to each of the sub-pixels of the emission layer.

6. The OLED element according to claim 5 , wherein the negative photoresist contains carbon chain structure having at least a fluoro-containing group.

7. The OLED element according to claim 5 , wherein the negative photoresist comprising photosensitive components, the photosensitive components include halogen-containing solvent, photoacid generator compound, at least a monomer contains fluoro-containing group and at least a copolymer contains acid-hydrolyzable ester-containing group.

8. The OLED element according to claim 7 , wherein halogen reagent is hydrofluoroether or segregated hydrofluoroether, the copolymer is random copolymer.

Assignees

• Wuhan China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Ren Hongyang
• Hsu Hsianglun

Classifications

• H01L51/504

  Electricity · mapped topic

• H01L51/56 Primary

  Electricity · mapped topic

• H01L51/0018

  Electricity · mapped topic

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/30 Primary

  Devices specially adapted for multicolour light emission · CPC title