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HL: Fachverband Halbleiterphysik

HL 86: Organic electronics and photovoltaics V (CPP, jointly with HL, O)

HL 86.10: Talk

Thursday, March 14, 2013, 17:45–18:00, H34

Insight into the photophysics of photocatalytically active polymeric carbon nitride: an optical quasi-monomer — •Christoph Merschjann¹, Tobias Tyborski^1,2, Steven Orthmann^1,3, Florent Yang¹, Klaus Schwarzburg¹, Michael Lublow^1,4, and Thomas Schedel-Niedrig¹ — ¹Helmholtz-Zentrum-Berlin für Materialien und Energie — ²Max-Born-Institut für nichtlineare Optik und Kurzzeitspektroskopie, Berlin — ³Technische Universität Berlin — ⁴Leibnitz-Institut für Katalyse, Rostock

A comprehensive investigation of the luminescent properties of photocatalytically active carbon nitride polymers, based on tri-s-triazine units, has been conducted for the first time. Steady-state temperature- and excitation-power-dependent as well as time-resolved measurements with near-UV excitation (λ = 325 nm & 405 nm) yield strong photoluminescence, covering the visible spectrum. The spectral, thermal and temporal features of the photoluminescence can be satisfactorily described by the excitation and radiative recombination of molecular excitons, localized at single tri-s-triazine units. The discussed model is in accordance with the recently reported absorption features of carbon nitride polymers. Thus, from the point of view of optical spectroscopy, the material effectively behaves as a monomer rather than a classical semiconductor.