Patent ID: 10873030

Abstract:
The present invention relates to a charge transporting semi-conducting material comprising: a) at least one electrical dopant, and b) a branched or cross-linked charge-transporting polymer comprising cyclobutenone cross-linking units of at least one of the general formulae la and/or lb, wherein aa) Pol1, Pol2, Pol3 and Pol4 are independently selected chains of the charge-transporting polymer, bb) X1, X2, X3, and X4 are independently selected optional spacer units or, independently, represent direct bonding of Pol1, Pol2, Pol3 and Pol4 chains to the cyclobutenone ring, cc) Z1, Z2, Z3, and Z4 are independently selected from H, halogen or a carbon-containing group; the charge transporting semi-conducting material being obtainable by a process comprising: i) providing a solution containing aaa) at least one precursor charge transporting compound comprising at least one covalently attacked alkenyloxy group having generic formula II wherein X is an optional spacer which is further linked to a charge transporting structural moiety of the precursor charge transporting compound, the dashed line represents the bonding to a charge transporting structural moiety of the precursor charge transporting compound and Z1, Z2, Z3, and Z4 are independently selected from H, halogen or the carbon-containing group, bbb) at least one electrical dopant, ccc) at least one solvent, ii) depositing the solution on a substrate, iii) removing the solvent, and iv) reacting the alkinyloxy groups to effect crosslinking, preferably by heating, wherein the average number of the alkinyloxy groups per one molecule of the precursor charge transporting compound provided in the step i) is equal to or greater than 2, preferably greater than 2.05, and a process for preparing the same.