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Light emitting devices and compounds

Active Publication Date: 2020-01-23
UNIVERSITY OF ST ANDREWS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a compound that exhibits TADF behavior, which means it can efficiently produce light. This compound has specific features that make it different from other similar structures. The text also explains how the compound can be modified to produce different colored light emitting devices. Overall, the patent text introduces a novel approach to create efficient TADF compounds with improved properties.

Problems solved by technology

Despite their highly desirable performance characteristics, the rarity of these metals, their high cost and their toxicity are important detracting features that inhibit large-scale, worldwide adoption of OLED technology.

Method used

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  • Light emitting devices and compounds
  • Light emitting devices and compounds
  • Light emitting devices and compounds

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Embodiment Construction

[0008]According to a first aspect, the present invention provides a compound according to formula I:

[0009]wherein the ring II:

[0010]represents an aromatic spacer ring with each Het bonded to adjacent carbon atoms and each moiety D bonded to adjacent carbon atoms, and

[0011]wherein each Het is an aromatic heterocyclic moiety and each D is a donor moiety.

[0012]The compound according to formula I exhibits TADF behaviour. The aromatic heterocyclic groups Het act as acceptor groups and the donor moieties D act as donor groups. The spatial separation of Het and D by the ring II provides segregation of the HOMO (centred on donors D) and LUMO (centred on acceptors Het) that provides efficient TADF behaviour.

[0013]The ring II may be a benzene ring and thus the compound of the invention may be according to formula III:

wherein D and Het have the same meaning as before. R* may be, independently for each occurrence, selected from the group consisting of —H, alkyl, aryl or heteroaryl (for example ...

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Abstract

Thermally Activated Delayed Fluorescence (TADF) compounds wherein two aromatic heterocyclic moieties are provided as acceptor groups, spaced apart from two donor moieties by an aromatic spacer ring, are described. Charged organic TADF species having a similar structure are also described. The TADF compounds and charged organic TADF species may be employed as emitter material in light emitting devices such as OLEDs and LEECs. Also described TADF compounds wherein at least one donor moiety is substituted by at least one substituent that is a phosphine oxide or a phosphine sulphide.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a 35 U.S.C. § 371 National Stage Application of International Application No. PCT / GB2015 / 054171, filed Dec. 29, 2015, which claims the benefit of UK Application No. 1507340.6 filed on Apr. 29, 2015, the entirety of each of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention is directed to the provision of Thermally Activated Delayed Fluorescence (TADF) compounds for use in OLEDs or other light emitting devices.BACKGROUND TO THE INVENTION[0003]Organic Light Emitting Diodes (OLEDs) have come to the fore as the state-of-the-art technology for visual displays and lighting. OLEDs are desirable as they are light-weight, flexible, provide better contrast and possess large viewing angle. OLEDs are also more power efficient than traditional lighting sources and thus their wide adoption can alleviate significantly the strain on current energy demand because lighting alone constitutes about...

Claims

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Application Information

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IPC IPC(8): H01L51/00C07D413/14C09K11/06C07D417/10C07D265/38C07D279/22C07F9/572
CPCC09K11/06C07F9/5728H01L51/007H01L51/0071C07D279/22C07D417/10H01L51/0072C07D413/14C07D265/38H01L51/5016C07D413/10C07F9/572C09K2211/1033C09K2211/1037C09K2211/1007C09K2211/1029H10K85/6565H10K85/657H10K85/6572H10K50/11H10K2101/20C09K2211/1048H10K50/135H10K2101/10C09K2211/1018
Inventor ZYSMAN-COLMAN, ELIWONG, MICHAEL
Owner UNIVERSITY OF ST ANDREWS
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