# US 11,444,253 B2 · Thermally activated delayed fluorescent material and preparation method thereof

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- Number: US 11,444,253 B2
- Document ID: US11444253B2
- Status: Granted
- Kind: B2
- Application number: 16/639,593
- Filed: 2020-01-03
- Published: 2021-12-09
- Granted: 2022-09-13
- Earliest claimed: 2019-11-06
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Bo Wang
- Web page: https://patentgrep.com/patent/US11444253B2

## CPC

- H10K 85/6576: {comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene}
- C07D 413/14: containing three or more hetero rings
- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C09K 11/06: containing organic luminescent materials
- H10K 85/654: {comprising only nitrogen as heteroatom (H10K85/652 takes precedence)}
- H10K 85/657: {Polycyclic condensed heteroaromatic hydrocarbons}
- H10K 85/6572: {comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole}
- C09K 2211/1018: Heterocyclic compounds
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 2101/20: Delayed fluorescence emission
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A thermally activated delayed fluorescent material includes a compound having structural formula (I) as follows: A-D (I). A is an electron acceptor and D is an electron donor. In addition, a method of preparing a thermally activated delayed fluorescent material and an organic light emitting diode display device using the thermally activated delayed fluorescent material as luminescent host material are provided. The organic light emitting diode display device includes an anode, a cathode, and an organic functional layer disposed between the anode and the cathode. The organic functional layer includes the thermally activated delayed fluorescent material having a structural formula (I).

## Claims

### Claim 1

A thermally activated delayed fluorescent material, comprising a compound having structural formula (I) as follows:
A-D (I),
wherein A is an electron acceptor, D is an electron donor, and the electron acceptor comprises any one of following chemical structural formulas:
and
wherein the electron donor comprises any one of following chemical structural formulas:

### Claim 2 (depends on 1)

The thermally activated delayed fluorescent material according to claim 1, wherein the compound comprises one of following chemical structural formulas: