We report the first observation of a significant synergistic effect in TTA upconversion from single sensitizer/multi-acceptor systems. The upconversion quantum yield of 32% for the PtOEP-DPBF/DPA system is the highest value ever reported. The hetero-TTA process between triplet acceptors of different types accounts for the synergistic effect, leading to the high upconversion efficiency. The highest hetero-TTA quantum yield for the dual-acceptor system is much higher than the TTA quantum yield of the single-acceptor systems. The results shed light onto the TTA upconversion process, and have a profound implication to future studies of TTA upconversion, as well as other photophysical processes.

High upconversion efficiency from triplet-triplet annihilation in multi-acceptor systems

246th National Meeting (2013)

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