Correlated hopping model for singlet exciton transport in lightly dohttp://www.sciencedirect.com/science/article/B6TFM-44DTGD2-KF/2/d498b4c6ab57aaaa33fd7a30ddc18badped naphthalene crystals

Abstract

A formalism of correlated lattice random walk is applied to the singlet exciton transport in naphthalene. Fluorescence experiments on excitation migration in naphthalene crystals (C10H8 and C10D8), lightly doped chemically (anthracene) or isotopically (C10DH7), over a wide temperature range (2-300 K) are interpreted in terms of a correlated hopping model. The hopping time is found to be of the order of 1 ps. The increase in the overall quenching (supertrapping) efficiency with reduced temperature is interpreted in terms of an increase by one or more orders of magnitude in the parameter of coherency (hopping correlation). The role of the trapping cross section is discussed.