Patent ID: 8198462

Claim:
A dendritic photoactive compound is represented by the following Formula 1a or Formula 1b: wherein n is 2, X is a phenylene, biphenylene, bisphenylene, or naphthylene that is unsubstituted or substituted with one or more groups selected from the group consisting of halogen, CN, a C 1 ˜C 6 alkyl group, a C 1 ˜C 6 alkoxy group, a C 1 ˜C 6 alkylthio group, and a morpholino group; a C 5 ˜C 20 arylene group that is unsubstituted or substituted with one or more groups selected from the group consisting of halogen, CN, a C 1 ˜C 6 alkyl group, a C 1 ˜C 6 alkoxy group, a C 1 ˜C 6 alkylthio group, and a morpholino group; or a C 4 ˜C 20 divalent heterocyclic group that is unsubstituted or substituted with one or more groups selected from the group consisting of halogen, CN, a C 1 ˜C 6 alkyl group, a C 1 ˜C 6 alkoxy group, a C 1 ˜C 6 alkylthio group, and a morpholino group and comprises O, N or S; or X is Y is selected from the group consisting of a C 1 ˜C 6 alkyl group; a phenyl group that is unsubstituted or substituted with one or more groups selected from the group consisting of halogen, CN, a C 1 ˜C 6 alkyl group, a C 1 ˜C 6 alkoxy group, a C 1 ˜C 6 alkylthio group, and a morpholino group; a C 5 ˜C 20 aryl group that is unsubstituted or substituted with one or more groups selected from the group consisting of halogen, CN, a C 1 ˜C 6 group, a C 1 ˜C 6 alkoxy group, a C 1 ˜C 6 alkylthio group, and a morpholino group; and a C 4 ˜C 20 heterocyclic group that is unsubstituted or substituted with one or more groups selected from the group consisting of halogen, CN, a C 1 ˜C 6 alkyl group, a C 1 ˜C 6 alkoxy group, a C 1 ˜C 6 alkylthio group, and a morpholino group and comprises O, N or S, and R1, R2, and R3 are each independently selected from the group consisting of a C 1 ˜C 6 alkyl group, nitrile group and phenyl group.