Abstract
Guest-Guest Triplet-Triplet annihilation in highly purified mixed crystals of naphthalene (guest)- naphthalene-d 8 (host) was studied at 1.8 K via spectrally and time-resolved phosphorescence and delayed- fluorescence. We find significant deviations from current diffusion theories and homogeneous kinetics but consistency with local heterogeneities (clusterization) and dynamic exciton percolation, as well as with long-range annihilation (via superexchange). There is negative evidence for an Anderson transition.
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