Tuesday, May 2025

11:30 AM - 11:50 AM

Room: LL20BC

Session: OLED Devices I

Design of OLED Capacitance by Material Combinations

Invited

• Alexander Schubert

  Merck KGaA, Darmstadt, Germany

Description:

Organic Light Emitting Diodes (OLEDs) are intricate multi-layer devices that play a pivotal role in modern display and lighting technologies. The transient phenomena associated with OLED panels, such as higher refresh rates and the integration of behind-screen cameras or sensors, necessitate rapid (de)charging of pixels, which is intrinsically linked to their capacitance characteristics. At the interfaces of different materials, charge carriers encounter abrupt changes in the energy landscape, often leading to accumulation effects that are evident in the capacitance-voltage curves. In this study, we demonstrate how the selection and combination of OLED materials across various layers can be aligned to engineer capacitance properties through dielectric spectroscopy and drift-diffusion simulations. Our findings reveal that one of the key parameters influencing capacitance is the polarity of the layers, which is attributed to spontaneous orientation polarization.