Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: Poster II
HL 26.16: Poster
Mittwoch, 11. März 2026, 09:30–11:30, P1
Host-Emitter Interactions in Single-Gaussian Deep-Blue Europium(II) OLED Emitters — •Mahmoud Soleimani1,2, Paulius Imbrasas2, Jan-Michael Mewes2, Felix Kaden2, Sebastian Schellhammer1, Toni Bärschneider2, Carsten Rothe2, and Sebastian Reineke1 — 1Institute of Applied Physics (IAP), Technische Universität Dresden, Germany — 2beeOLED GmbH, Dresden, Germany
Lanthanide-based emitters offer a promising approach to stable and efficient deep-blue organic light-emitting diodes (OLEDs). While divalent europium [Eu(II)] and trivalent cerium [Ce(III)] can provide ideal emission colors with near-unity exciton utilization, their integration into thin-film architectures remains insufficiently understood. In particular, the compatibility of lanthanide complexes with organic host materials and possible lanthanide-specific interactions are open questions. To shed light on and gain a deeper understanding of these aspects, we combine photoluminescence spectroscopy and density functional theory to evaluate the behavior of a literature-reported Eu(II) emitter and to introduce two new carborate-based Eu(II) complexes. These novel materials exhibit deep-blue single-Gaussian 4f-5d emission. Our experimental and theoretical analysis provides a framework for understanding electron confinement and shielding in Eu-based emitters, establishing design principles for a new class of stable, efficient deep-blue OLED materials.
Keywords: OLED; Blue Emitter; Deep-Blue Europium complex; Organic Semiconductor; Luminescence