Polarized superradiance from delocalized exciton transitions in tetracene single crystals
Andrea Camposeo (1), Marco Polo (1,2), Silvia Tavazzi (3), Leonardo, Silvestri (3), Peter Spearman (3), Roberto Cingolani (1), Dario Pisignano, (1,2) ((1) National Nanotechnology Laboratory of CNR-INFM, Lecce, Italy, (2), Scuola Superiore ISUFI, Universit\`a del Salento, Lecce
TL;DR
This study demonstrates polarized superradiant emission in tetracene single crystals, showing exciton delocalization over approximately 40 molecules and a significant reduction in radiative lifetime at low temperatures.
Contribution
It provides direct experimental evidence of polarized superradiance and exciton delocalization in tetracene crystals, advancing understanding of excitonic interactions in organic semiconductors.
Findings
Polarized superradiant emission observed in tetracene crystals.
Radiative lifetime decreases nearly linearly with temperature.
Exciton delocalization involves about 40 molecules.
Abstract
Polarized superradiant emission and exciton delocalization in tetracene single crystals are reported. Polarization-, time-, and temperature-resolved spectroscopy 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 of the radiative lifetime with temperature, being fifteen times shorter at 30 K compared to the isolated molecule, with an exciton delocalization of about 40 molecules.
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