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Triplet interactions in solution processed organic devices

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To motivate the significance of triplet charge interactions I will briefly introduce recent progress in solution processed phosphorescent organic light-emitting diodes (OLEDs). In contrast to small organic molecule devices, complete modelling of the devices is lacking due to missing rate constants for a variety of dynamic processes in solution based OLE Ds. We developed a method based on time-resolved gated spectroscopy to investigate triplet charge interactions. I will present our study of triplet charge interactions in unipolar devices of polymers and small molecules doped with Pt(II)- of Ir(III)-complexes. To quantify interaction processes it is essential to obtain space-charge-limited currents. From our measurements we extract the mobility which is in good agreement with independent time-of-flight studies. It will be shown how matrix and complex structure influence the rate constant for triplet-charge interaction. At the end I will show results on the magnetic field influence on triplet charge interactions which might give some insight to understanding of organic magnetoresistance effects.

This talk is part of the Optoelectronics Group series.

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