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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster Session I
CPP 17.13: Poster
Monday, March 27, 2023, 18:00–20:00, P3
Self-heating in OLED Lighting — •Anton Kirch1,2, Axel Fischer1, Matthias Liero3, Jürgen Fuhrmann3, Annegret Glitzky3, Ludvig Edman2, and Sebastian Reineke1 — 1Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), TU Dresden, Germany — 2Department of Physics, Umeå University, Sweden — 3Weierstrass Institute Berlin, Germany
For bright area light sources, such as OLED lighting tiles, the electric resistivity of transparent electrodes induces a non-uniform current distribution within the device. At high driving currents, the interaction between conductivity, heat, and power dissipation results in a positive electrothermal feedback loop, which drastically exacerbates inhomogeneities in local device temperature and luminance.
Such nonlinear behavior induces unprecedented electrothermal effects that compromise the performance of bright area light sources. In this contribution, we present how Joule self-heating squeezes temperature and current into a tiny device region, while the remainder of the active area decreases in luminance (Switch-back effect) [1]. We further introduce how the dimension of the active area governs the current-voltage characteristics of the OLED and how two and even three stable operating branches develop (tristability) that can promote destructive incidences [2].
References
[1] Kirch et al., Light: Science & Applications 9, 5 (2020)
[2] Kirch et al., Adv. Func. Mat. 31, 47 (2021)