Concentration dependent nondiffusive triplet energy transport on a disordered lattice in the chemically mixed crystal dichlorobenzene–dibromobenzene

Abstract

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“…This is reflected by the observation that when we selectively excite DCB monomers by pulsed singlet-triplet laser excitation, the phosphorescence decay is faster than expected from the average DCB triplet lifetime of 16 ms. 23 Moreover, depending on DCB concentration, the decay is strongly nonexponential. 23,24 This is not surprising as cluster sizes and individual transfer routes between donors (DCB monomers) themselves and donors and acceptors (DCB aggregates) will reflect the substitutional disorder depicted in Fig. 1.…”

“…We have already shown 24 that the decay can be empirically described by a Kohlrausch-type 25 stretchedexponential behavior at short times and a monoexponential decay at long times via the equation /phos == /£rexp[-(r/T)^-//Ti]+/ 0 exp(-//ro), (1) with 0 < p < 1 and the triplet lifetime T\ « TO. TO rule out the possibility of parallel one-step transport processes between statistically distributed donors and acceptors as has been described by Inokuti and Hirayama, 26 we tried to fit our results with a logarithmic-exponential form, which was quite less satisfying than the stretchedexponential behavior.…”