Abstract: A TADF dendrimer of formula (I), (Ar1)m—(Ar2)—(X)n, wherein: Ar2 is a pyridine, pyrimidine, pyrazine, pyridazine, triazine or tetrazine ring group; m is from 1 to 5; n is 0, 1 or 2; each Ar1 is a six-membered aromatic or heteroaromatic ring comprising at least one dendron Z positioned meta to the ring position on Ar1 where Ar1 is attached to acceptor core Ar2. Dendrons Z are carbazole-based.

Abstract: An organic thermally activated delayed fluorescence (TADF) compound selected from the group consisting of compounds according to formula (Ia) and formula (Ib): wherein: Het is a heteroaryl group containing at least one heteroatom; n(D) denotes n donor groups D bonding to the heteroaryl group Het; n is at least 1; and -a and -b denotes bonding to another group.

Abstract: An organic thermally activated delayed fluorescence (TADF) compound selected from the group consisting of compounds according to formula (Ia) and formula (Ib): wherein: Het is a heteroaryl group containing at least one heteroatom; n(D) denotes n donor groups D bonding to the heteroaryl group Het; n is at least 1; and -a and -b denotes bonding to another group.

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.

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.

Abstract: Charged organic thermally activated delayed fluorescence (TADF) species are described. A light-emitting electrochemical cell (LEEC) includes the charged organic thermally activated delayed fluorescence (TADF) species and sufficient counter ions to balance the charge on the charged organic thermally activated delayed fluorescence species, as emitter material. Also disclosed are OLEDSs containing the TADF species.

Abstract: Charged organic thermally activated delayed fluorescence (TADF) species are described. A light-emitting electrochemical cell (LEEC) includes the charged organic thermally activated delayed fluorescence (TADF) species and sufficient counter ions to balance the charge on the charged organic thermally activated delayed fluorescence species, as emitter material. Also disclosed are OLEDSs containing the TADF species.

Abstract: Cationic iridium III complexes including a ligand according to formula I are provided. The linking group Z is a hydrocarbylene linking group comprising at least two carbon atoms in a chain. Ligands according to formula I have increased rigidity about the central bond linking the two five membered rings by virtue of the linking group Z, when compared to previous biimidazole related ligands. Increased photoluminescence quantum yield may been obtained in cationic iridium III complexes provided with these ligands.

Abstract: Organic thermally activated delayed fluorescence (TADF) species according to Formula I are described. The species have donor (D) and acceptor (A) moieties bonded to a ring system (Q). Q is an unsaturated carbocyclic or heterocyclic ring system including at least two rings fused together. The ring system Q may include at least one polyunsaturated ring, typically an aromatic or heteroaromatic ring. A polyunsaturated ring includes at least two double bonds. The ring system Q may include at least one benzene ring fused to at least one other ring. Both the at least two rings fused together in ring system Q may be aromatic and/or heteroaromatic rings. The ring system Q may be an annelated benzene or annelated heteroarene ring system.

Abstract: A light-emitting device includes an organometallic complex of the form Z-M-Z1, as light emitting material. M is Pd(0) or Pt(0) and Z is a nitrogen containing heterocyclic carbene ligand. Z1 is a phosphorus ligand or a nitrogen containing heterocyclic carbene ligand that may be the same as or different from Z. The light emitting device may be an organic light-emitting diode (OLED), a sensor, or a light-emitting electrochemical cell (LEEC).

Abstract: A light-emitting device includes an organometallic complex of the form Z-M-Z1, as light emitting material. M is Pd(0) or Pt(0) and Z is a nitrogen containing heterocyclic carbene ligand. Z1 is a phosphorus ligand or a nitrogen containing heterocyclic carbene ligand that may be the same as or different from Z. The light emitting device may be an organic light-emitting diode (OLED), a sensor, or a light-emitting electrochemical cell (LEEC).

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.

Abstract: Charged organic thermally activated delayed fluorescence (TADF) species are described. A light-emitting electrochemical cell (LEEC) includes the charged organic thermally activated delayed fluorescence (TADF) species and sufficient counter ions to balance the charge on the charged organic thermally activated delayed fluorescence species, as emitter material. Also disclosed are OLEDSs containing the TADF species.

Abstract: Cationic iridium III complexes including a ligand according to formula I are provided. The linking group Z is a hydrocarbylene linking group comprising at least two carbon atoms in a chain. Ligands according to formula I have increased rigidity about the central bond linking the two five membered rings by virtue of the linking group Z, when compared to previous biimidazole related ligands. Increased photoluminescence quantum yield may been obtained in cationic iridium III complexes provided with these ligands.