Novel star-shaped subporphyrins with monodisperseoligocarbazolearms were prepared by using pyridine-tri-N-pyrrolylborane as a template. It was found that photoinduced energy transfer took place from the oligocarbazolearms to the subporphyrin core, and the energy transfer efficiency decreased with an increase in the number of carbazole units in the arms. These subporphyrins could emit intense yellow-green
absorption and steady-state fluorescence spectroscopy, together with the corresponding monodisperseoligocarbazole aldehyde precursors. It is found that the light-harvesting capability of T(OCAn)Ps increases with the increasing length of the arms and reaches the maximum when n = 6. A selective excitation of the oligocarbazolearms leads to the typical emission from the porphyrin cores, indicating occurrence