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Jifu Sun, Wanhua Wu, Huimin Guo and Jianzhang Zhao Visible-Light Harvesting with Cyclometalated Iridium(III) Complexes Having Long-Lived 3IL Excited States and Their Application in Triplet–Triplet-Annihilation Based Upconversion European Journal of Inorganic Chemistry 2011

Article first published online: 21 JUN 2011 | DOI: 10.1002/ejic.201100501

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Cyclometalated iridium(III) complexes with intense absorption in the visible region were prepared. The complexes show long-lived intraligand triplet excited states, with lifetimes (τT) of up to 75.5 μs (ΦP = 0.6 %). The complexes were used as triplet sensitizers in triplet–triplet-annihilation (TTA) upconversion, and quantum yields (ΦUC) of up to 21.3 % were observed.

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