Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Molecular Electronics and Excited State Properties

CPP 3.5: Vortrag

Montag, 1. April 2019, 10:45–11:00, H13

Simultaneous Singlet-Singlet and Triplet-Singlet Förster Transfer — •Anton Kirch, Max Gmelch, and Sebastian Reineke — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden, 01187 Dresden, Germany

We present our study of Förster resonant energy transfer (FRET) for the interesting case using a biluminescent donor material. FRET is used as spectroscopic ruler in various research fields and also determines many photonic and optoelectronic applications on the nanoscale. A biluminescent organic molecule is one that shows both fluorescence and phosphorescence at room temperature, where the latter is only observed under special conditions, which are currently widely explored in material research. The time dynamics of such a biluminophore is very special, spanning from nanoseconds-lifetime fluorescence to seconds-lifetime phosphorescence.

Here, we show that such a biluminescent donor can transfer its energy of both singlets and triplets to a fluorescent donor in the exact same framework of FRET. For both singlet and triplet energy transfer, we separately determine the nanoscale range (< 10 nm). The unified observation and description of singlet and triplet FRET from the very same molecular origin (same donor) has not been discussed in literature before. Importantly, our study validates Förster's theory on a single system over eight orders of magnitude in respective excited state lifetimes.