Phys. Rev. B 81, 033306 (2010) [4 pages]Polarized superradiance from delocalized exciton transitions in tetracene single crystalsReceived 23 December 2009; published 22 January 2010 Polarized superradiant emission and exciton delocalization in tetracene single crystals are reported. Polarization-, time-, and temperature-resolved spectroscopies evidence the complete polarization of the zero-phonon line of the intrinsic tetracene emission from both the lower (F state) and the upper (thermally activated) Davydov excitons. The superradiance of the F emission is substantiated by a nearly linear decrease in the radiative lifetime with temperature, being 15 times shorter at 30 K compared to the isolated molecule, with an exciton delocalization of about 40 molecules. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.81.033306
DOI:
10.1103/PhysRevB.81.033306
PACS:
78.47.jf, 42.50.Nn, 78.40.Me, 78.45.+h
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