Abstract: A polymer comprising one or more optionally substituted repeat units of formula (I): wherein each Ar1 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Ar2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; n and m in each occurrence is at least 1; and R1 and R2 are substituents wherein R1 and R2 are different.

Abstract: An organic electronic device comprising an anode, a cathode, a semiconducting layer between the anode and the cathode and a hole transporting layer between the anode and the semiconducting layer, the hole-transporting layer comprising a co-polymer comprising repeat units of formula (I) and one or more co-repeat units: (I) wherein: Ar1 independently in each occurrence represents a fused aryl or fused heteroaryl group that may be unsubstituted or substituted with one or more substituents; Ar2 represents an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; R independently in each occurrence represents a substituent; and m is 1 or 2, preferably 1; and each Ar1 is directly bound to an aromatic or heteroaromatic group of a co-repeat unit.

Abstract: A polymer comprising a repeat unit of formula (I): wherein R1 in each occurrence is independently H or a substituent, and the two groups R1 may be linked to form a ring; R2 in each occurrence is independently a substituent; Ar1 in each occurrence is independently an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; R3 in each occurrence is independently a substituent; each n independently is 0, 1, 2 or 3 with the proviso that at least one n=1; and each m is independently 0 or 1. The polymer may be a light-emitting 103 of an organic light-emitting device.

Abstract: A copolymer comprising a repeat unit of Formula (I) and at least one further repeat unit: Formula (I) wherein: wherein: Ar1 and Ar2 are each independently selected from aryl and heteroaryl, each of which is independently unsubstituted or substituted with one or more substituents; each R is independently a substituent; each n is independently 0, 1 or 2; each m is independently 0, 1, 2 or 3, and at least one of the repeat units of the polymer is a partially conjugating repeat unit.

Abstract: A polymer comprising one or more optionally substituted repeat units of formula (I): wherein each Ar1 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Ar2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; n and m in each occurrence is at least 1; and R1 and R2 are substituents wherein R1 and R2 are different.

Abstract: A polymer comprising one or more optionally substituted repeat units of formula (I): (I) wherein each Ar1 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Ar2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; n and m in each occurrence is at least 1; and R1 and R2 are substituents wherein R1 and R2 are different.

Abstract: A polymer comprising a repeat unit of formula (I): (I) wherein Ar6 and Ar7 each independently represent a substituted or unsubstituted aryl or heteroaryl group; Sp represents a spacer group comprising a chain of at least 2 aliphatic carbon atoms spacing Ar6 from Ar7; m is at least 1; and if m is greater than 1 then —(Ar7)m forms a linear or branched chain of Ar7 groups in which Ar7 in each occurrence may be the same or different.

Abstract: A polymer comprising a repeat unit of formula (I): wherein R1 in each occurrence is independently H or a substituent, and the two groups R1 may be linked to form a ring; R2 in each occurrence is independently a substituent; Ar1 in each occurrence is independently an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; R3 in each occurrence is independently a substituent; each n independently is 0, 1, 2 or 3 with the proviso that at least one n=1; and each m is independently 0 or 1. The polymer may be a light-emitting 103 of an organic light-emitting device.

Abstract: A copolymer comprising a repeat unit of Formula (I) and at least one further repeat unit: Formula (I) wherein: wherein: Ar1 and Ar2 are each independently selected from aryl and heteroaryl, each of which is independently unsubstituted or substituted with one or more substituents; each R is independently a substituent; each n is independently 0, 1 or 2; each m is independently 0, 1, 2 or 3, and at least one of the repeat units of the polymer is a partially conjugating repeat unit.

Abstract: A polymer comprising a repeat unit of formula (I): (I) wherein Ar6 and Ar7 each independently represent a substituted or unsubstituted aryl or heteroaryl group; Sp represents a spacer group comprising a chain of at least 2 aliphatic carbon atoms spacing Ar6 from Ar7; m is at least 1; and if m is greater than 1 then —(Ar7)m forms a linear or branched chain of Ar7 groups in which Ar7 in each occurrence may be the same or different.

Abstract: An organic electronic device comprising an anode, a cathode, a semiconducting layer between the anode and the cathode and a hole transporting layer between the anode and the semiconducting layer, the hole-transporting layer comprising a co-polymer comprising repeat units of formula (I) and one or more co-repeat units: (I) wherein: Ar1 independently in each occurrence represents a fused aryl or fused heteroaryl group that may be unsubstituted or substituted with one or more substituents; Ar2 represents an aryl or heteroaryl group that may be unsubstituted or substituted with one or more substituents; R independently in each occurrence represents a substituent; and m is 1 or 2, preferably 1; and each Ar1 is directly bound to an aromatic or heteroaromatic group of a co-repeat unit.

Abstract: A polymer comprising one or more optionally substituted repeat units of formula (I): (I) wherein each Ar1 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; each Ar2 independently represents a substituted or unsubstituted aromatic or heteroaromatic group; n and m in each occurrence is at least 1; and R1 and R2 are substituents wherein R1 and R2 are different.