Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.51: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Influence of encapsulation material on organic magnetoconductance effect in organic light emitting diodes (OLED) — •Annika Morgenstern1, Dominik Weber2, Apoorva Sharma1, Daniel Schondelmaier2, Dietrich R.T. Zahn1,3, and Georgeta Salvan1,31Semiconductor Physics, TU Chemnitz, 09107 Chemnitz, Germany — 2Nanotechnology and Functionalized Surfaces, Westsächsische Hochschule Zwickau, 08056 Zwickau, Germany — 3Center of Materials, Architectures and Integration of Nanomembranes, TU Chemnitz, 09126 Chemnitz, Germany

Organic semiconductors are the basic building block of organic light-emitting diodes (OLED). It was reported that certain OLEDs based on Alq3, P3HT, etc. when exposed to an external magnetic field show a change in the electrical resistance. This phenomenon is called the organic magnetoconductance (OMC) effect, which stems from the influence of the magnetic field on the charge carrier density and/or mobility. OLEDs are also known to degrade due to the infiltration of oxygen and moisture into the constituting layers. In this work, we present a systematic study of the influence of polymethyl methacrylate (PMMA) and soda-lime glass encapsulation layer on the OMC effect, using a homebuilt electrical test bench based on a magnetic field modulation technique to remove the time-dependent change in the current. Additionally, we compare the passivation efficacy of the investigated encapsulation material on the lifetime of OLEDs. The lifetime of the studied OLEDs were measured using a test setup equipped with a photodiode, allowing to record the OLED light output over time.

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