Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 50: Organic semiconductors
HL 50.6: Talk
Wednesday, March 13, 2013, 11:00–11:15, H13
The Effect of Confinement on the Exciton Dynamics in the Organic Semiconductor Rubrene — •B. Gieseking1, T. Schmeiler1, B. Müller1, C. Deibel1, V. Dyakonov1,2, and J. Pflaum1,2 — 1Experimental Physics VI, Julius-Maximilian University of Würzburg, D-97074 Würzburg — 2Bavarian Centre for Applied Energy Research (ZAE Bayern), D-97074 Würzburg
As for its inorganic counterpart the future developements in organic electronics are driven by the advancing device miniaturization. As a consequence the correlation between the opto-electronic properties and device dimensions has shifted continuously into the spotlight.
In this work we present a systematic investigation of the temperature dependent photoluminescence decay for well-defined structures of the organic semicondutor rubrene. The analysed samples exhibit an increasing degree of confinement and we confirm a direct influence on the PL spectra as well as on the excitation dynamics on ultrafast timescales already for a localization of excitation on the µm scale. Our results highlight the role of the local enviroment affecting the exciton dynamics in organic semiconductors which has to be taken into account for the design of future organic opto-electronic devices.
Financial support by the DFG (FOR 1809) is acknowledged.