Abstract
The concentration change of prompt and delayed fluorescence spectra of naphthalene in poly(methyl methacrylate) (PMMA) was investigated at 293 and 77 K. For high concentrations, delayed and prompt excimer fluorescence were observed. It is suggested that molecular pairs of naphthalene are responsible for the excimer fluorescence in the PMMA matrix. The ratio φ E/φ M of the excimer fluorescence yield to the molecular fluorescence yield was determined and was found to be considerably larger for the delayed than for the prompt fluorescence. The difference is explained by excitation energy transfer in the triplet state.
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