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<p>(<sup>3</sup>Sen*) after <a href="page.php?w=intersystem_crossing">intersystem crossing</a> (ISC). The excitation energy on the sensitizer then transfers through a <a href="page.php?w=Dexter_electron_transfer">Dexter</a> type triplet energy transfer (TET) to a <a href="page.php?w=ground_state">ground state</a> emitter, generating a <a href="page.php?w=Triplet_state">triplet</a> excited emitter (<sup>3</sup>Em*). Two triplet excited emitters then interact in a second energy transfer process, known as triplet-triplet annihilation (TTA). Upon TTA</p><p>
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