Abstract
We concentrate on the relaxation of electronic excitation in naphthalene crystals doped with the substitutional impurity β-methylnaphthalene (BMN) and in particular how impurity interactions with the host might affect exciton trapping. The presence of chemical impurities in a crystal can produce states in the system due to perturbations of the host lattice.1 When the impurity is a trap these states may have a role in the trapping of electronic excitation by becoming secondary traps around the primary trap site.2 in this trapping model delocalized electronic excitation would first encounter a secondary trap and then relax to the localized primary trap site causing an energy cascade or funnel effect. Kopelman and co-workers have identified χ traps in the BMN-doped naphthalene system and concluded that the trapping site extends only to the nearest neighbors of the trapping center.3,4
© 1989 Optical Society of America
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