Journal of the Physical Society of Japan · 1992 · 11 citations · 5 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSpectroscopyCrystal ChemistryElectron-phonon InteractionsElectronic Band StructureElectronic Excited StatesLuminescent MaterialsOptical Properties Of SolidsAbsorption SpectraElectron-phonon ScatteringExciton-phonon CouplingExciton-phonon InteractionsExcitonsLuminescence MechanismsNon-equilibrium Thermal TransportPhonon Scattering
Luminescence and absorption spectra of coronene single crystals are studied. Free-exciton luminescence is observed for the first time. The intensity of free-exciton luminescence decreases with decreasing temperature, suggesting that free excitons are in thermal equilibrium with excitons in a relaxed state which is located 1070 cm -1 below the bottom of the free-exciton band. The line shape of the O–O absorption band which is located at 23220 cm -1 at 10.4 K is Lorentzian, indicating that scattering of excitons by phonons is weak.
5