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Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 15: [HL] Organic Semiconductors: Transistors and OLEDs (Joint Session DS/CPP/HL/O)

DS 15.10: Talk

Tuesday, March 23, 2010, 12:00–12:15, H15

Probing charge carrier dynamics in conducting polymers using single molecules as sensors — •Maximilian Nothaft1, Steffen Höhla2, Aurélien Nicolet3, Jens Pflaum4, Fedor Jelezko1, and Jörg Wrachtrup113. Phys. Ins., Univ. Stuttgart — 2Chair of Display Technology, Univ. Stuttgart — 3MoNOS, Huygens Laboratory Leiden — 4Exp. Phys. VI, Univ. Wuerzburg and ZAE Bayern

Doping of conducting polymers by guest molecules is widely applied in organic light emitting devices to improve their efficiency. By reducing the concentration of suited guest molecules it becomes possible to study the dynamics of single molecule emitters using confocal microscopy.

In our contribution we discuss the optical properties of single Dibenzoterrylene dye molecules dispersed in an OLED consisting of PPV as host material. It will be shown how to prepare devices of photostable single molecules in PPV emitting a constant flux of single photons at room temperature by excitation from a Ti:sapphire laser.

By simultaneous laser excitation and electrical operation it is possible to detect the effect of injected charge carriers on the dynamics of single quantum emitters. Since the ratio of singlet to triplet exciton formation in the device is 1:3, this leads to an effective pumping to the triplet state of the single molecule thereby reducing its fluorescence intensity. Modeling this process it becomes possible to associate the reduced fluorescence intensity with the local current density at the position of the molecule. This correlation enables us to optically probe the current density in an OLED with nm spatial resolution.

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