POLYMERS, THEIR PREPARATION AND USES

摘要

An organic copolymer having a plurality of regions along the length of the copolymer backbone the said regions comprising region (iii) as defined below, and at least one of region (i) and/or region (ii), wherein
region (i) is a first region for transporting negative charge carriers and having a first bandgap defined by a first LUMO (Lowest Unoccupied Molecular Orbital) level and a first HOMO (Highest Occupied Molecular Orbital) level, wherein the first region comprises a structural unit derived from a first monomer comprising a substituted or unsubstituted aromatic or heteroaromatic group;
region (ii) is a second region for transporting positive charge carriers and having a second bandgap defined by a second LUMO level and a second HOMO level, wherein the second region comprises a structural unit derived from a second monomer comprising a substituted or unsubstituted aromatic or heteroaromatic group; and region (iii) is a third region for accepting and combining positive and negative charge carriers to generate light and having a third bandgap defined by a third LUMO level and a third HOMO level, wherein the third region comprises a structural unit derived from a third monomer comprising a triarylamine unit, wherein the triarylamine unit comprises a group having a formula as shown in Formula IV
wherein A and B are the same or different and are substituent groups, and wherein each region comprises one or more monomers and the quantity and arrangement of the monomers in the organic copolymer is selected so that the first, second and third bandgaps are distinct from one another in the copolymer.