Time-resolved Fluorescence

This technique has the following projects (and possibly other techniques) related to it:

• Excited state and charge carrier dynamics in organic semiconductors
• Light induced processes in artificial antenna complexes
• Light induced processes in artificial reaction centers
• Photochemistry and excited state dynamics of melanin and its building blocks

Time-resolved Fluorescence

Description setup

Infrared pulses with a duration of 100 fs and a repetition rate of 82 MHz (Spectra-Physics, Tsunami) are first stretched to 200 fs and subsequently sent through a pulse picker (NEOS, 17389.-93-FOA with 71009) to reduce the repetition rate to 8 MHz. The output is either frequency doubled or tripled using a Photop Technologies doubler/tripler. The output is focused on the sample of interest and the resulting emission is collected at magic angle using two 1-inch diameter 50 mm focal length glass objective lenses and focused on the slit of a spectrograph (Chromex). The output is sent into a streak camera setup (Hamamatsu, C6860). An example of a measurement is shown in Figure 1.

Figure 1. Typical measurement with streak camera setup.