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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.26: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Kinetic Monte Carlo simulations of energy transfer processes in an organic light emitting diode — •Leanne Paterson and Denis Andrienko — Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

Organic light emitting diodes (OLEDs), utilise small organic molecules, in order to achieve an emissive electroluminescent layer. Ultra-thin, lightweight and flexible characteristics offer a highly enticing substitute, in comparison to their inorganic counterpart. It is therefore understandable why there has been a large amount of research, focused on enhancing the efficiency and stability of OLEDs. However, achieving a blue OLED, which is both efficient and stable, has proven to be problematic. The challenge originating with the limitations of the individual blue emitters, be that phosphorescent or fluorescent. Commercially, stability is prioritised, in order to achieve a long-lived consumer product, but with battery life on portable devices being the cost of any inefficiency, it is vital that blue OLEDs become more efficient. By developing a Kinetic Monte Carlo (KMC) code, for the study of excited molecule energy transfer, the individual emitters can be studied. Making direct comparisons to experimentally achieved results, it is possible to investigate processes, such as Förster resonance energy transfer (FRET) and Dexter energy transfer. Using the KMC code a unicoloured phosphor-sensitised fluorescence (UPSF) OLED and the corresponding energy transfer processes are explored. The fundamental efficiency and lifetime limits are identified, providing a clear insight, and expanding on experimentally achieved results.

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