Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics I
CPP 22.5: Talk
Tuesday, March 10, 2026, 10:45–11:00, ZEU/0260
Substituted Benzo[b]fluorenes as Emitters for OLED With Tunable Electroluminescence in the Full Visible Range — •Pascal Schweitzer1, Christopher M. Leonhardt2, Cazibe Arslan1, Hermann A. Wegner2, and Derck Schlettwein1 — 1Justus-Liebig-Universität Gießen, Institut für Angewandte Physik, Heinrich-Buff-Ring 16, D-35392 Gießen — 2Justus-Liebig-Universität Gießen, Institut für Organische Chemie, Heinrich-Buff-Ring 17, D-35392 Gießen
Organic light emitting diodes (OLED), despite widespread application in displays, still exhibit major challenges. The search for stable and efficient emitting molecules continues, especially in the blue range. Substituted benzo[b]fluorenes (BF) show high stability of photoluminescence in solution over months. By exchanging the substitutional pattern, we show that this group of molecules allows for preparation of OLED with tunable emission bands in the full range of the visible spectrum. Thin films of BF can be prepared by solution-based methods or physical vapor deposition, allowing for easy integration into different layer stacks. Photoluminescence spectroscopy of showcase BFs revealed a multi-band emission that is found in line with electroluminescence spectra of the corresponding devices. Contact formation at relevant device interfaces was studied by in-situ Kelvin-probe force microscopy and gave insight into details of film growth and alignment of transport levels. Based on these findings we demonstrate working OLED devices with intense blue or red emission, respectively.
Keywords: Kelvin-Probe Force Microscopy (KPFM); OLED; organic semiconductor; photoluminescence; thin film