Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 71: Organic Electronics and Photovoltaics - OLEDs and Molecular Excitations

CPP 71.6: Vortrag

Donnerstag, 15. März 2018, 16:15–16:30, C 243

Influencing and quantifying the intersystem crossing in biluminescent organic molecules by adding heavy atoms — •Felix Fries¹, Anna Haft¹, Ramunas Lygaitis², Olaf Zeika¹, and Sebastian Reineke¹ — ¹Dresden Integrated Center for Applied Physics and Photonic Materials, TU Dresden, Nöthnitzer Str. 61, 01187 Dresden — ²Kaunas University of Technology, K. Donelaičio g. 73, 44249 Kaunas

Organic molecules are able to show a broad variety of emission types. Fluorescence, phosphorescence or charge transfer (CT) state emissions have very different properties in energy and time regime. For one emitter, CT does not play a role and normally, those systems only show either fluorescence or phosphorescence. We name systems showing both fluorescence and phosphorescence at room temperature, biluminescent. An advantage of having experimentally access to both emission channels is that a very detailed description of the energetic behaviour of those molecules is possible. Here, we focus on a series of molecules with different levels of bromination. Namely those molecules are, N,N,N’,N’-tetraphenyl-[1,1’-biphenyl]-4,4’-diamine (TPB) and Br_xTPB, where x = 1 … 4. Extensive analysis of those molecules gives the luminescent lifetimes (∼ns, ∼ms), their contribution to the quantum yield and allows to quantify the intersystem crossing rate as a function of the bromination. Furthermore, the experimental results can be compared to numerical simulations like a line shape analysis of the radiative transitions, allowing deeper understanding of the influences of the heavy atom effect on the molecules’ energetic landscape.