Crystal Spectra of Tetracene and Rubrene under Pressure
- 1 June 1968
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 48 (11), 4817-4821
- https://doi.org/10.1063/1.1668088
Abstract
Pressure‐induced spectral shifts (0–20 kbar) are compared for the absorption and fluorescence of tetracene and rubrene as crystals or embedded in polystyrene matrices. At 20 kbar the red shift of the tetracene crystal absorption is two to three times larger than either the red shift of tetracene in polystyrene or rubrene in both crystal and solid‐solution environments. The crystal shifts and increased Davydov splitting at high pressure are related to calculations on compressed anthracene by Rice and Jortner. The spectral shifts indicate that crystal‐field effects are negligible for rubrene due to steric factors. Strong specific interactions in the excited state between the phenyl substituents of rubrene and the phenyl groups of polystyrene are indicated from the fluorescence spectra at atmospheric pressure. The influence of pressure on tetracene crystal luminescence can be described in terms of excitation‐energy transfer to tetracene dimers at defects. High pressures enhance the transformation of excitation energy into heat, probably by increasing non‐radiative excition trapping at imperfections.Keywords
This publication has 39 references indexed in Scilit:
- Absorption and Excimer Fluorescence Spectra of Sandwich Dimers of Substituted AnthracenesThe Journal of Chemical Physics, 1966
- Chemiluminescence from the Reduction of Rubrene Radical CationsJournal of the American Chemical Society, 1966
- Excimer Fluorescence of Crystalline Anthracene and Naphthalene Produced by High PressureThe Journal of Chemical Physics, 1965
- Fluorescence of Anthracene in Lucite at Very High PressuresJournal of the Optical Society of America, 1965
- Excimer Formation and Emission via the Annihilation of Electrogenerated Aromatic Hydrocarbon Radical Cations and AnionsJournal of the American Chemical Society, 1965
- Interaction of Perpendicular π-Electron SystemsJournal of the American Chemical Society, 1963
- Electronic Spectral Shifts of Nonpolar Molecules in Nonpolar SolventsThe Journal of Chemical Physics, 1957
- New Types of Thermochromic Substances. The Stereochemical Aspect of Thermochromism; Thermochromism and VinylogyJournal of the American Chemical Society, 1954
- Absorption spectrum of rubrene in different solventsSpectrochimica Acta, 1951
- Rough Compressions of 177 Substances to 40,000 Kg/CmProceedings of the American Academy of Arts and Sciences, 1948