Diffusion of Triplet Excitons in Pure Crystalline Naphthalene

Author: Matyskiela, Walter William, Jr.

Year: 1968

Degree: Bachelor's thesis

Advisor: Robinson, G. Wilse

Committee Member: Unknown, Unknown

Option: Chemistry

DOI: 10.7907/vr7c-gm61

Abstract

The diffusion of triplet excitons in pure crystalline naphthalene is investigated using delayed fluorescence, arising from the annihilation of two triplet excitons producing a fluorescing singlet exciton, as a probe. Insufficient lab time prevented any numerical evaluation of the diffusion constant. As previously reported,1 the lifetime for the triplet exciton, determined from the first-order components of the phosphorescence and delayed fluorescence decay curves, is 130 ± 20 msec. Impurities and exposure of the sample to the atmosphere were found to have significant effects upon the spectral characteristics of the samples.

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