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- W2130462796 abstract "NN–PtII–bis(acetylide) complexes [NN = 4,4′-bis(tert-butyl-2,2′-bipyridine) (dbbpy)] with ethynylpyrene (Pt-2) or 4-ethynyl-1,8-naphthalimide ligands (Pt-3) that show long-lived 3IL triplet excited states (τT = 118.0 μs) were used as new triplet sensitizers for triplet–triplet annihilation (TTA) based upconversion (UC). UC quantum yields of up to 18.1 % were observed. We found that the triplet–triplet energy-transfer (TTET) processes, which are crucial for the TTA UC, were improved by up to 150-fold and 250-fold with Pt-2 (Stern–Volmer quenching constant KSV = 5.70 × 105 M–1) and Pt-3 (KSV = 9.64 × 105 M–1), respectively, relative to the model complex dbbpy–PtII–bis(phenylacetylide) (Pt-1) (KSV = 3.80 × 103 M–1). The efficient upconversion is attributed to the long-lived triplet excited states as well as the high T1-state energy level of the sensitizers Pt-2 and Pt-3." @default.
- W2130462796 created "2016-06-24" @default.
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- W2130462796 date "2012-05-09" @default.
- W2130462796 modified "2023-10-18" @default.
- W2130462796 title "Efficient Triplet–Triplet Annihilation Upconversion with Platinum(II) Bis(arylacetylide) Complexes That Show Long‐Lived Triplet Excited States" @default.
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- W2130462796 doi "https://doi.org/10.1002/ejic.201200109" @default.
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