Nature of lasting luminescence of rubrene in solution
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The T2→T1 fluorescence of rubrene is absent in liquid solutions due to the rapid internal conversion between the T2 and T1 triplet states of the molecule.
During sensitized excitation a delayed fluorescence of rubrene arises due to a crossed annihilation of the molecules, that of the energy donor and rubrene in the triplet state. Its efficiency is considerably higher than when two rubrene triplet molecules collide.
KeywordsTriplet State Energy Donor Liquid Solution Internal Conversion Rubrene
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