Models for Luminescence Degradation in Organic Solids

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Abstract
The damage vs dose relationship for radiation damage in organic solids is computed on the basis of several models, and the results are compared with experimental data reported by various workers. Two models are amenable to analytical treatment: (1) after a hit, all molecules within a given sphere centered about the hit molecule are poisoned, and none outside, and (2) there is a constant probability that excitation of any molecule throughout the crystal will result in quenching independent of its distance from the hit molecule. The fact that experiment agrees with the result of the latter model, but disagrees with the former, implies that the damage mechanism has a very large range. A lower limit of approximately 1000 angstroms, corresponding to 3×104 jumps of the excitation energy among neighboring molecules is found as a requirement for consistency with the latter model.

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