Two-photon-induced singlet fission in rubrene single crystal

• Main Authors: Gurzadyan, Gagik G., Ma, Lin, Galstyan, Gegham, Zhang, Keke, Sun, Handong, Soci, Cesare, Michel-Beyerle, Maria Elisabeth, Kloc, Christian
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2013
• Online Access: https://hdl.handle.net/10356/101277; http://hdl.handle.net/10220/10998
• Institution: Nanyang Technological University

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.