Luminescence of Free and Self-Trapped Excitons in α- and β-Perylene Crystals
- 15 November 1984
- journal article
- research article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 53 (11) , 3999-4008
- https://doi.org/10.1143/jpsj.53.3999
Abstract
Luminescence spectra and decaytimes have been measured over a wide temperature range. Thermal equilibrium population between free and self-trapped excitons has been confirmed in both dimeric (α) and monomeric (β) forms of perylene crystals. Two-center type self-trapped exciton in α-perylene, and one-center type and two-center type self-trapped excitons in β-perylene are stable and play prominent roles in exciton radiative decay. The decaytimes of free and self-trapped exciton luminescence are discussed in terms of exciton-lattice interaction. The exciton band width is briefly discussed.Keywords
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