Cover Picture: Single Dibenzoterrylene Molecules in an Anthracene Crystal: Spectroscopy and Photophysics (ChemPhysChem 8/2007)

Abstract

The cover picture shows a sublimation‐grown anthracene crystal doped with dibenzoterrylene. The deep blue color is the anthracene crystal's intrinsic fluorescence, excited by a mercury line at 365 nm. The red color arises from scattered near‐infrared (785 nm) laser light used to excite dibenzoterrylene. Fluorescence exits the crystal dominantly through the edges, defects and cracks. The bottom of the figure presents a high‐resolution broad‐band fluorescence excitation spectrum of the sample at low temperature around 785 nm. Every sharp line marks the zero‐phonon transition of a single dibenzoterrylene molecule. The group of lines at 12 590 cm−1 is one of the two spectroscopic sites (the “red site”) whose photophysics are studied in the Article by Nicolet et al. on page 1215.