Mutual Annihilation of Singlet Excitons in [sgrave]-Conjugated Polysilanes

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Abstract
In previous papers, we have reported that the exciton-exciton annihilation rate constant is very high for singlet excitons in poly(n-propyl methyl silane) and that it is insensitive to temperature. In this paper, we report further that this rate constant is roughly the same magnitude as that found earlier in both poly(phenyl methyl silane) and poly(di-n-hexyl silane), and that it is not affected by the molecular weight of the polymer, at least in poly (di-n-hexyl silane). However, solid films of poly(di-n-hexyl silane) undergo an order-disorder transition near 42°C, and it appears that this transition causes an order of magnitude decrease in the annihilation rate constant.