Abstract
Sandwhichlike palladiumphthalocyanine was found to possess highly efficient NIR triplet sensibilization with an increasing of ligand number, due to the triplet energy level (ET) enhancing and the triplet lifetime (3τ0) prolonging and resulting in efficient triplet–triplet energy transfer (TTT). Also, rhodamine B (RhB) was found to act as reactive triplet acceptor that emits red-to-yellow upconversion when doped with sandwhichlike complex. By tuning pH value, the three-layered phthalocyanine/RhB system presents so far the highest red-to-yellow upconversion efficiency (ΦUC) as large as 10.5% (λex = 655 nm, 1W·cm–2), which has provided a simple approach to develop not only the new-type highly efficient NIR sensitizers but also the TTA-UC supported pH response applied in biomedicine.
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