SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: Organic Electronics and Photovoltaics I (joint session CPP/HL)

CPP 18.9: Talk

Tuesday, March 28, 2023, 11:45–12:00, GÖR 226

Investigation on organic light-emitting diodes, fabricated by a self-developed and highly automated physical vapor deposition system — •Fabian Binder, Mona Löther, Pascal Schady, Vladimir Dyakonov, and Andreas Sperlich — Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg

Organic light emitting diodes (OLEDs) are most commonly produced in ultra-high vacuum by physical vapor deposition (PVD) of several organic and metallic layers on a carrier substrate. We developed an automated PVD system, mainly consisting of two vacuum chambers for organic and metal deposition, respectively. Stepper motors and sensor solutions ensure a smooth and precise positioning of the carrier substrate above the evaporation crucibles. The substrate is then rotated with a defined speed to achieve an even deposition of the material. In order to vapor-deposit material, a certain material-specific temperature range is required which is realized by a software-based temperature controller which manages the evaporation rate according to the user’s specifications. A user interface facilitates planning of the desired OLED layer stack and provides information about the production progress. The capabilities of our new PVD system were tested by producing OLEDs based on multiple-resonance TADF emitters of the DABNA series. We performed electro-optical LJV-characterization and determined the devices’quantum efficiencies. The results of this investigation will enable us to optimize the production process with regard to evaporation rates and layer thicknesses.