Abstract
An emission enhancement strategy was realized in this study by introducing phosphorescent antennas and complexing with cucurbit[7]uril (CB [7]). The phenylpyridinium antenna units were attached covalently to the luminescence center of Ru (bpy)32+ by a two-step reaction. The resulting compounds showed strong near-infrared emission with quantum efficiencies as high as 6.6% in aerated water. Furthermore, complexing with CB [7] significantly enhanced their emission and improved quantum efficiency to a record value of 11.0% in aerated water by suppressing nonradiative decay of triplet state and improving intramolecular energy transfer. This result provided a general strategy for emission enhancement and will likely promote development of organic photoluminescence.
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