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Thermally activated delayed fluorescence molecules, materials comprising said molecules, and devices comprising said materials

A technology of thermal activation delay and electronic devices, which is applied in the direction of luminescent materials, electric solid devices, semiconductor devices, etc., and can solve the problems of short emission decay time and so on

Pending Publication Date: 2020-08-21
UNIVERSITY OF DURHAM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no molecular system provides sufficiently short emission decay times and efficient thermally activated delayed fluorescence for TADF emitters

Method used

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  • Thermally activated delayed fluorescence molecules, materials comprising said molecules, and devices comprising said materials
  • Thermally activated delayed fluorescence molecules, materials comprising said molecules, and devices comprising said materials
  • Thermally activated delayed fluorescence molecules, materials comprising said molecules, and devices comprising said materials

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[0133] The properties of the TADF molecules described herein can be adjusted by providing one or more functional groups bonded to one or more carbon atoms of the conjugated polycyclic ring system of the central core donor unit. These additional functional units can be provided to adjust the emission properties of the molecule and / or to alter the solubility and / or processing properties of the molecule.

[0134] For example, using t Bu or a small alkyl group para to each nitrogen nucleus atom, functionalizing the electron-donor core portion of the TADF emitter molecule, will make 1 The CT level is slightly red-shifted and allows the use of non-polar P=O group hosts, which is very useful for using TAT-3DBTO 2 Subject conditioning is important for TADF emitters.

[0135] can be used as Figure 11 The electron acceptor part shown replaces DBTO 2 . This modification can also be used to make 1 The CT level is slightly red-shifted without significantly affecting the molecular w...

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Abstract

A thermally activated delayed fluorescence (TADF) molecule comprising: a central electron donor moiety, wherein the central electron donor moiety is formed of a conjugated multi-ring system comprisingthree nitrogen atoms; and three electron acceptor moieties, each bonded to the central electron donor moiety via one of the three nitrogen atoms, wherein at least one of the three electron acceptor moieties is twisted relative to the central electron donor moiety defining a torsion angle in a range 40 degrees to <90 degrees whereby the TADF molecule has a photoluminescence quantum yield of >60% and a rate of reverse intersystem crossing from a lowest excited triplet state to a lowest excited singlet state of at least 1*10<6> s<-1>.

Description

technical field [0001] The present invention relates to thermally activated delayed fluorescence (TADF) molecules, materials comprising said molecules and devices comprising said materials. Background technique [0002] Organic light-emitting diodes (OLEDs) have become a central part of materials chemistry research, and as a result, there is a growing demand for more efficient and higher-quality display devices. Thus, there is great interest in organic OLED materials that emit light through a thermally activated delayed fluorescence (TADF) mechanism. Through this mechanism, the dark triplet excited state is switched by efficient reverse intersystem crossing (rISC) using an aromatic donor-acceptor (D-A) molecule (typically the D and A units are orthogonally conjugated) to emit a singlet state. These systems usually start from the singlet charge transfer state ( 1 CT) emission, but requires a locally excited triplet state ( 3 LE) energy is very close to this 1 CT. figure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D487/14H01L51/50
CPCC07D487/14H10K85/6576H10K85/6572H10K50/11H10K2101/20C09K11/06
Inventor 安德鲁·P·蒙克曼乔纳森·S·伍德马丁·R·布莱斯丹尼尔·G·康格雷夫帕洛玛·莱斯·多斯桑托斯
Owner UNIVERSITY OF DURHAM
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