Quantitative cascade energy transfer in semiconductor thin films

In this contribution we report the photophysical study of three organic blend systems comprising [60]-PCBM along with different combinations of five extended semiconducting arylacetylenes, i.e. p-[(2-{[m, pdidodecyloxyphenyl] ethynyl}-7-fluorenyl) ethynyl] benzonitrile, 4,7-bis(5-{[m, p-bis(hexyloxy) phenyl]ethynyl} thien-2-yl)-2,1,3-benzothiadiazole, 9,10-bis-[(m, m-bis{[m, m-bis-(hexyloxy) phenyl] ethynyl}phenyl) ethynyl]-anthracene, pseudo-p-[(10-{[m, p-bis-(hexyloxy) phenyl] ethynyl}-9-anthryl[2.2] paracyclophane, and oligo{2,5-bis(hexyloxy)[1,4-phenylene ethynylene]-alt-[9,10-anthraceneethynylene]}, and one semiconducting arylvinylene, i.e. 9,10-bis-{(E)-[m, p-bis(hexyloxy) phenyl] vinyl}-anthracene, that evidenced an efficient quantitative energy transfer from the hypsochromic to the bathochromic species (the potential efficient charge-donor components), useful to extend the collection of sunlight. An interesting emission enhancement in thin films has been observed only for the arylvinylene derivative.