Vibronically coherent ultrafast triplet-pair formation and subsequent thermally activated dissociation control efficient endothermic singlet fission

Hannah L. Stern, Alexandre Cheminal, Shane R. Yost, Katharina Broch, Sam L. Bayliss, Kai Chen, Maxim Tabachnyk, Karl Thorley, Neil Greenham, Justin M. Hodgkiss, John Anthony, Martin Head-Gordon, Andrew J. Musser, Akshay Rao, Richard H. Friend