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Plasmon-enhanced homogeneous and heterogeneous triplet-triplet annihilation by gold nanoparticles.

We report the investigation of surface plasmon induced enhancement of homogeneous and heterogeneous triplet-triplet annihilation (TTA) by gold nanoparticles (AuNPs). Results show that AuNPs enhance the overall efficiency in both cases. Excitation rate and intersystem crossing efficiency of the sensitizer, and efficiency of energy transfer between sensitizer and acceptor are believed to be enhanced by the surface plasmon of AuNPs, leading to the enhancement of overall TTA efficiency.