Electrochromic polyamic acid material, preparation method thereof, and display device

Patent metadata

Field	Value
Publication number	US-11537020-B2
Application number	US-201916496963-A
Country	US
Kind code	B2
Filing date	Jun 14, 2019
Priority date	May 21, 2019
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

The present invention provides an electrochromic polyamic acid material, a preparation method thereof and a display device, wherein the molecular structure of the electrochromic polyamic acid material includes oligoaniline and carbazolyl triphenylamine. The oligoaniline serves as an electrochemically sensitive group, and the carbazolyl triphenylamine serves as a fluorescence emitting group. The electrochromic polyamic acid material is an electrically controlled fluorescent polymer. Fluorescence intensity of the electrochromic polyamic acid material undergoes reversible fluorescence conversion with a change of an applied voltage, due to a redox reaction of the oligoaniline at different voltages, resulting in an interchange between a benzene ring and an anthracene ring in a molecular structure, and an electron/energy transfer path with the fluorescence emitting group are generated or eliminated, thereby realizing the electrically controlled fluorescent properties of the electrochromic polyamic acid material.

First claim

What is claimed is:

1. A display device, comprising an electrochromic polyamic acid material comprising a molecular structure represented by formula below:

wherein the molecular structure of the electrochromic polyamic acid material comprises oligoaniline and carbazolyltriphenylamine, and the oligoaniline is an electrochemically sensitive group, and the carbazolyltriphenylamine serves as a fluorescence emitting group; and
wherein the display device further comprises:
a first electrode;
a hole injection layer disposed on the first electrode and made of material comprising the electrochromic polyamic acid material;
a hole transport layer disposed on the hole injection layer;
a light emitting layer disposed on the hole transport layer;
an electron transport layer disposed on the light emitting layer;
an electron injection layer disposed on the electron transport layer; and
a second electrode disposed on the electron transport layer.

2. The display device according to claim 1 , wherein
the first electrode is an anode made of indium tin oxide, and the second electrode is a cathode made of one of lithium fluoride and aluminum.

Assignees

• Wuhan China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Wang Yamin

Classifications

• C08G73/1042 Primary

  Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds · CPC title

• G02F2202/046

  fluorescent · CPC title

• C08G73/105

  with oxygen only in the diamino moiety · CPC title

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• G02F1/15165 Primary

  Polymers · CPC title