S. Kazaoui, H. J. Byrne, and N. Minami
[Fullerenes and Fullerene Nanostructures, p. 551, 1996]

Electronic excited states specific to solid C₇₀ have been identified at 1.85 and 2.30eV by several spectroscopies including UV-visible absorption, electro-absorption, luminescence and its interaction with external electric field as well as steady state photoconductivity. The solid state specific features coincide well with the photocarrier generation efficiency onset at 1.85eV and with the shoulder at 2.3eV. The results can be interpreted in terms of branching either in the excitation or relaxation processes involving intermolecular charge transfer excited states at 1.85 and 2.30eV. The differences between C₆₀ and C₇₀ films are discussed.