Temperature Dependence of Crystalline Tetracene Fluorescence

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Abstract
A 100‐fold increase in the fluorescence emission of crystalline tetracene is observed on cooling from room temperature to 4°K. Phase transformations and lattice distortions are reflected in a drastic change of the emission spectra: the high‐temperature modification has an emission that resembles closely tetracene dimer fluorescence while the low‐temperature modification fluorescence is nearly a mirror image of the absorptionspectrum. The changes in the quantum yields are interpreted on the basis of the Dexter–Fowler model which predicts a considerable difference in the rates of radiationless transitions from different vibronic states.

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