TIME RESOLVED TRIPLET EXCITON ENERGY TRANSFER IN ISOTOPIC MIXED NAPHTHALENE CRYSTALS
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Date
1978
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Ohio State University
Abstract
Energy transfer of the lowest triplet state of isotopic mixed naphthalene $h_{8}$-naphthalene $d_{8}$ single crystal was studied. To monitor the exciton flow, spectrally resolved phosphorescence time evolutions of guest naphthalene-$h_{8}$ and trap beta-methyl-naphthalene, as well as other impurity traps, were measured at $4.2^{\circ}K$, using a high pressure Xenon lamp as the excitation source. We find changes in the decay times around the triplet exciton critical concentration (about 9\% naphthalene-$h_{8}$ in -$d_{8}$). This is consistent with the onset of multistep energy transfer in the guest (naphthalene-$h_{8}$) component at this concentration. These results will be discussed in terms of the dynamic percolation and Anderson localization models.
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Author Institution: Department of Chemistry, The University of Michigan