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HL: Fachverband Halbleiterphysik

HL 58: OFETs, OLEDs, and organic optoelectronics

HL 58.3: Vortrag

Mittwoch, 18. März 2015, 17:00–17:15, EW 202

Time-resolved measurement of intramolecular photoinduced electron transfer processes in perylene diimides — •Robin Carl Döring¹, Eduard Baal², Jörg Sundermeyer², and Sangam Chatterjee¹ — ¹Faculty of Physics and Materials Science Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany — ²Faculty of Chemistry and Materials Science Center, Philipps-Universität Marburg, Hans-Meerwein-Str., D-35043 Marburg, Germany

Perylene diimides (PDI) are commonly used as dyes but are also viable candidates for devices such as organic field-effect transistors and organic photovoltaics. We study a series of PDI samples by time-resolved photoluminescence and transient absorption measurements to identify the relaxation mechanisms following fs-optical excitation. Here, photoinduced electron transfer (PET) can occur. Following a high-energy excitation, an electron from the lone pair of the diimide is transferred to the HOMO of the perylene core, hence disallowing radiative recombination. By introducing alkyle groups as spacer units the distance between electron donor and the fluorophore is increased. Therefore, the distant distance dependent PET is altered, leading to a reduced PET efficiency and hence changed decay rates.