Light emitting devices and compounds
AssigneeUniversity Court of the University of St Andrews
InventorsEli Zysman-Colman, Michael Wong
Life of this patent
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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.
Claims37
1-37. (canceled)
A TADF compound according to formula I:
- wherein the ring II:
- represents an aromatic spacer ring with each Het bonded to adjacent carbon atoms and each moiety D bonded to adjacent carbon atoms, and
- wherein each Het is an aromatic heterocyclic acceptor moiety and each D is a donor moiety.
A TADF compound according to formula Ic:
- wherein the ring II:
- represents an aromatic spacer ring wherein each Acc is an acceptor moiety with each acceptor moiety Acc bonded to adjacent carbon atoms, each D is a donor moiety and each donor moiety D bonded to adjacent carbon atoms, and
- wherein one of the donor moieties D is according to formula A and the other is according to formula A or according to formula B:
- wherein -L represents the bonding position to ring II;
- X1 is selected from the group consisting of O, S, NR and CR2, wherein each R is independently selected from the group consisting of —H, alkyl, aryl or heteroaryl, inclusive of substituted or unsubstituted C1-C20 alkyl;
- and
- represents, independently for each occurrence a substituted or unsubstituted aryl or heteroaryl ring fused to the central ring of structures A or B.
A charged organic TADF species according to formula Ia:
- wherein the ring II:
- represents an aromatic spacer ring with each Het bonded to adjacent carbon atoms and each moiety D bonded to adjacent carbon atoms;
- wherein each Het is an aromatic heterocyclic acceptor moiety and each D is a donor moiety and sufficient counter ions C are provided to balance the charge on the species according to formula Ia.
A TADF compound wherein at least one donor moiety (D) is substituted by at least one substituent selected from the group consisting of phosphine oxide and phosphine sulphide.
Dependencies are inferred from the claim text.