Project Details
Projekt
P6: Unraveling the photophysics of stimulus-responsive emitters with time-resolved electronic and vibrational laser spectroscopy
Applicant
Professor Dr. Peter Vöhringer
Subject Area
Physical Chemistry of Molecules, Liquids and Interfaces, Biophysical Chemistry
Term
since 2025
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 535200000
The project’s main objective is to explore the primary photophysical mechanisms, i.e. sequence of elementary processes and associated time scales, of stimulus-responsive emitters using ultrafast time-resolved electronic and vibrational spectroscopies in the near-UV-to-near-IR and MIR spectral regions. The project will scrutinize emitters from the three different families, i.e. 1) mechano-responsive luminescence, MRL, 2) aggregation-dependent luminescence, ADL, 3) spin-flip luminescence, SFL, and determine the rate constants, and hence quantum yields, of structural and electronic relaxation processes that ultimately result in the emission of a photon. Ultrafast spectroscopy will be applied primarily on liquid, or ideally lsc-fluid, samples exposed to an orthogonal stimulus derived from the thermodynamic state variables, temperature, T, and pressure, p. Varying T at constant p will enable us to tune the solvent density, ρ, seamlessly from liquid-like to gas-like. Concurrently, this will modify other physico-chemical quantities of the medium such as viscosity and/or dielectric constant, which, in turn, should affect structural and electronic relaxation processes in a profound manner. These interrelations will provide unique insight into the nature of the stimulus-responsivity of the studied emitters and provides immediate feedback to the synthetically oriented projects of the research group.
DFG Programme
Research Units
