Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster Session IV

CPP 46.53: Poster

Mittwoch, 14. März 2018, 11:00–13:00, Poster A

Synthesis of a series of brominated TPB molecules to increase the phosphorescence — •Anna Haft¹, Felix Fries¹, 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

Biluminescent emitter molecules are able to show phosphorescence and fluorescence efficiency at room temperature. N,N,N',N'-tetraphenyl-[1,1'-biphenyl]-4,4'-diamine (TPB) is one of these special emitters. By adding heavy atoms like bromine it is possible to increase the ratio of phosphorescence to fluorescence by increasing the intersystem crossing through intramolecular heavy atoms.

To investigate this effect, a series of TPB derivates was synthesized successfully. The pure TPB was obtained using the Ullmann reaction. A bromination in para position in case of mono to tetra brominated species was achieved via an electrophilic substitution with N-bromosuccinimide. The materials were investigated in form of a host:guest system embedded in a rigid matrix of poly(methyl methacrylate) PMMA with respect to the internal conversion rates, where the increased phosphorescence-to-fluorescence ratio with increasing heavy atom decoration was confirmed.