Regensburg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster 1

CPP 12.41: Poster

Montag, 5. September 2022, 18:00–20:00, P1

Optimization Strategies for Purely Organic Room-Temperature Phosphorescence — •Heidi Thomas and Sebastian Reineke — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, TU Dresden

The development of organic materials displaying room-temperature phosphorescence (RTP) with lifetimes in the range of several hundred milliseconds is a research field that has attracted more and more attention in the last years. By using amorphous purely organic systems, we have been able, for example, to develop programmable luminescent tags. Still, the potential of such emitter systems is far from being exploited. We present a new family of organic luminescent derivatives embedded in amorphous matrices with phosphorescence lifetimes up to 2.6 s, extending their applicability. Hydrogen bonds between the emitters and the matrix presumably suppress vibrational dissipation, thus enabling bright long-lived phosphorescence. Further optimization of the host:emitter system is related to the film preparation technique. By varying host polymer, post-annealing temperature, and fabrication procedure, we analyze the phosphorescent lifetime, the photoluminescent quantum yield, and the phosphorescence-to-luminescence ratio. The film thickness turns out to affect the performance the most: Going from thin to thick spin-coated films, the phosphorescence lifetime could be increased by a factor of up to 2.5.