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HL: Fachverband Halbleiterphysik
HL 16: Organic Semiconductors
HL 16.5: Vortrag
Dienstag, 18. März 2025, 10:30–10:45, H14
Toward High Efficiency and Stable Blue OLEDs/Organic Light-Emitting Diodes with Lanthanide-Based Complexes: Host Material Impact — •Mahmoud Soleimani1,2, Paulius Imbrasas2, Sebastian Schellhammer1, Carsten Rothe2, and Sebastian Reineke1 — 1Institute for Applied Physics (IAP), Technische Universität Dresden, Germany — 2beeOLED GmbH, Dresden, Germany
Lanthanides offer a new approach for achieving blue emission in organic light-emitting diodes (OLEDs). Cerium (III) and Europium (II) complexes emit in the blue range via the 5d-4f transition, potentially enhancing the stability and efficiency of OLEDs, outperforming current emitters. However, precise ligand design around the lanthanide is required for a stable, blue-emissive complex. With the right ligands, emitters with near-unity photoluminescence quantum yield in solution have been demonstrated. In the transition to OLED-compatible thin-films, we found that the host material plays a key role in maintaining this luminescence efficiency and that it can also impair emission through quenching mechanisms caused by unfavorable energy level alignment and coordination of the metal-organic complex by the host. This study investigates the photoluminescence of Cerium (III) tris(pyrazolyl)borate complex blended with four common OLED emission layer hosts. These insights guide the development of efficient blue OLEDs with lanthanide complexes.
Keywords: OLED; Blue Emitter; Lanthanide complex; Organic Semiconductor; Luminescence