title: Two-photon-induced singlet fission in rubrene single crystal.
abstract: The two-photon-induced singlet fission was observed in rubrene single crystal and studied by use of femtosecond pump-probe spectroscopy. The location of two-photon excited states was obtained from the nondegenerate two-photon absorption (TPA) spectrum. Time evolution of the two-photon-induced transient absorption spectra reveals the direct singlet fission from the two-photon excited states. The TPA absorption coefficient of rubrene single crystal is 52 cm∕GW at 740 nm, as obtained from Z-scan measurements. Quantum chemical calculations based on time-dependent density functional theory support our experimental data.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
authors.forename: Lin
authors.initials: L
authors.lastname: Ma
authors.forename: Gegham
authors.initials: G
authors.lastname: Galstyan
authors.forename: Keke
authors.initials: K
authors.lastname: Zhang
authors.forename: Christian
authors.initials: C
authors.lastname: Kloc
authors.forename: Handong
authors.initials: H
authors.lastname: Sun
authors.forename: Cesare
authors.initials: C
authors.lastname: Soci
authors.forename: Maria E
authors.initials: ME
authors.lastname: Michel-Beyerle
authors.forename: Gagik G
authors.initials: GG
authors.lastname: Gurzadyan
mesh_terms: D018360:Crystallography, X-Ray; D008958:Models, Molecular; D015394:Molecular Structure; D009279:Naphthacenes / Q000737:chemistry*; D017785:Photons; D011789:Quantum Theory; D013057:Spectrum Analysis
chemical_list: D009279:Naphthacenes; C045049:rubrene