Abstract
Results on temperature and concentration dependences of triplet exciton fusion and triplet energy transfer in isotopically mixed naphthalene crystals are presented. Exciton fusion in the trap states is investigated by delayed fluorescence emission. Energy transfer efficiency is analyzed by the relative transfer yield to a supertrap acting as a sensor. The temperature dependences observed on delayed fluorescence and on energy transfer are similar, with a threshold at T ∿ 5K, suggesting a common origin for both processes. Numerical solutions of a master equation in a two-dimensional crystal are provided. The results may be understood by considering a two optical phonon mechanism (with a phonon energy equal to 40 cm-1) and by taking into account the long-range dipolar interaction between traps due to the spin-orbit coupling of triplet states to upper singlet states.
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© 1985 D. Reidel Publishing Company
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Pée, P., Brown, R., Dupuy, F., Rebière, Y., Kottis, P., Lemaistre, JP. (1985). Fusion and Transfer of Triplet Excitons in Isotopically Mixed Naphthalene Crystals. In: Daudel, R., Korb, JP., Lemaistre, JP., Maruani, J. (eds) Structure and Dynamics of Molecular Systems. Structure and Dynamics of Molecular Systems, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5351-2_8
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DOI: https://doi.org/10.1007/978-94-009-5351-2_8
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