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Magneto-conductance characteristics of trapped triplet-polaron and triplet-trapped polaron interactions in anthracene-based organic light emitting diodes.

The effects of a magnetic field on the dissociation of triplet excitons by free charges (TCI) are well understood. However, the magneto-conductance (MC) characteristics of trapped triplet-polaron interactions (Tt PI) and triplet-trapped polaron interactions (TPt I) within organic light emitting diodes (OLEDs) are not well understood. We have studied these interactions in an anthracene-based OLED. The electroluminescence spectra, current-voltage characteristics and magneto-electroluminescence indicated that the anthracene layer contained many defects that could trap either triplet excitons or polarons, which led to TPt I and Tt PI. The MC curves at low temperature exhibited a complex line shape, which indicated that intersystem crossing, TPt I, Tt PI, and TCI occurred simultaneously in the device. The individual MC characteristics of TPt I and Tt PI were extracted from temperature dependant MC curves by fitting them to three empirical Lorentzian functions and one non-Lorentzian function. The MC of TPt I exhibited a negative sign, while that of Tt PI exhibited a positive one, with characteristic magnetic fields (B0 ) of ∼10.5 and ∼15 mT, respectively. Both processes were prominent below 150 K and weakened with increasing temperature. TPt I was neglected above 200 K, while Tt PI was observed even at ambient temperature. These results add significant insight into the magnetic field effects on triplet-polaron interactions.

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