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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 57: Organic Electronics and Photovoltaics IV - Excitonic Properties and Light-Emitting Devices

CPP 57.3: Vortrag

Donnerstag, 4. April 2019, 15:30–15:45, H18

Time-resolved Spectroscopy of Organic Light Emitting Diodes based on Thermally Activated Delayed Fluorescence — •Jeannine Grüne, Nikolai Bunzmann, Sebastian Weißenseel, Vladimir Dyakonov, and Andreas Sperlich — Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg

Organic light emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) show increased efficiencies due to efficient upconversion from the non-emissive triplet states to the emissive singlet state via reverse intersystem crossing (RISC). Therefor a small energetic splitting between singlet and triplet states is required which can be achieved by formation of an exciplex state, a weakly bound electron-hole pair at a donor:acceptor interface. A proven material combination is among others 4,4',4''-Tris[(3-methylphenyl)phenylamino]triphenylamine (m-MTDATA), as donor and Tris(2,4,6-trimethyl-3-(pyridin-3-yl)phenyl)borane (3TPYMB), as acceptor. We investigated this system with time-resolved electroluminescence (trEL) in combination with time-resolved magnetic resonance techniques based on EL and photoluminescence detection (trELDMR, trPLDMR). In the latter case, microwave irradiation is used to induce transitions between the triplet states which are split in a present magnetic field. By applying microwave pulses over several microseconds, the spin-dependent EL modulation processes as well as the corresponding time frames can be identified, to get a better understanding of the triplet contribution to the TADF mechanism.

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