Self-reversal in the exciton phosphorescence of 1,4-dibromonaphthalene

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Abstract
Self‐reversed line shapes have been observed in the low temperature phosphorescence spectrum of 1,4‐dibromonaphthalene crystals when the crystals are illuminated by a collimated laser beam. Self‐reversal is a consequence of reabsorption of the phosphorescence emission. The precise shape of the self‐reversed lines is a very sensitive measure of small changes in the unreabsorbed emission spectrum with respect to the absorption spectrum and energy shifts as small as 1% of the linewidth can be measured. For dibromonaphthalene we attribute these changes to macroscopic variations in strain within the crystal. Numerical calculations of the line shapes based on a simple but realistic model are compared with the experimental line shapes.
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