Frenkel Exciton Dynamics in Anthracene under High Pressure and Quasi-Free Exciton State

概要

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The polarized absorption and luminescence spectra of anthracene crystals havebeen investigated under high pressures and at room temperature. A satellite absorp-tion band which shifts to lower energy with increasing pressure is found to be relatedwith the vibronic luminescence series. As the origin of the vibronic luminescence amodel of a quasi-free exciton is proposed. The vibronic luminescence bands loosetheir intensity with pressure and are replaced by intrinsic self-trapped excitonluminescence at pressures higher than about 18 kbar. Self-trapping of excitons seemsto be enhanced by the second order phase transition which occurs at 24 kbar. The ex-citon-phonon coupling constant at 22 kbar is estimated to be at least 1.6 which shouldbe compared to 0.85 at ambient pressure.
社団法人日本物理学会の論文
1986-07-15