Effect of C₇₀ rotation on the photoluminescence spectra of compressed C₇₀*mesitylene

Abstract

The efficient photoluminescence (PL) emission of solvated fullerenes has attracted significant interest because of their potential applications. Uncovering the possible factors that govern the PL emission of solvated fullerenes thus becomes important for the purpose of application. Here, we report a high pressure study on a typical solvated fullerene, C70*mesitylene, using the diamond anvil cell technique with associated spectroscopic measurements. Our Raman and PL spectra show that there is a change in the pressure dependence for the normalized PL intensity in solvated samples during the rotational transition. It indicates that the rotational state of C70 is a critical factor which can influence the PL emission of solvated samples. The optical absorption (OA) spectra further suggest that the C70–C70 interactions in solvated samples compared with those in desolvated samples are hindered under pressure because of the intercalation of solvent, which makes the PL emission in solvated samples more sensitive to the change in C70 rotations under pressure. Copyright © 2016 John Wiley & Sons, Ltd.

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