Unveiling the concentration dependent direct triplet formation via singlet fission in a tetracene derivativeNikolaus Wollscheid, Nicolo Alagna, J. Luis Perez Lustres, Tiago Buckup, Sebastian Hahn, Uwe H. F. Bunz and Marcus MotzkusEPJ Web Conf., 205 (2019) 09031DOI: https://doi.org/10.1051/epjconf/201920509031