Exciton-Exciton Annihilation as a Mechanism for Uphill Transfer in a Molecular Excitonic System Craig N. Lincoln, Matthias Block, Bastian Baudisch, Pavel Malevich, Hans von Berlepsch, Eberhard Riedle and Jürgen Hauer EPJ Web Conf., 205 (2019) 06017 Published online: 16 April 2019 DOI: 10.1051/epjconf/201920506017