Fig. 3: Nanosecond time-resolved non-polarized luminescence, circular anisotropy and photoselection-induced linear anisotropy of Eu[(+)-facam]3 in DMSO solution.
From: Broadband transient full-Stokes luminescence spectroscopy
a, Non-polarization sensitive luminescence spectra (excitation 343 nm, 200 fs and 500 Hz) with varying time bins, normalized by maximum value to highlight spectral changes. Key early-time spectral features are labelled as the broad peak around 400–500 nm (LC), and a series of peaks at 520–600 nm (\(\genfrac{}{}{0ex}{}{\,5}{}{D}_{1}\,\to \,\genfrac{}{}{0ex}{}{7}{}{F}_{{J}_{2}}\)). b, Kinetic traces of the non-polarization sensitive luminescence signal, at wavelengths corresponding to key features in spectra. c–e, Time-resolved CPL spectra (excitation 343 nm, 200 fs and 50 kHz) with 5 ns bins using horizontal excitation polarization to avoid photoselection. The transition 5D1 → 7F2 at 560 nm is shown magnified in an inset and labelled. f–h, Time-resolved S1 linear polarization measurement (excitation 343 nm, 200 fs and 50 kHz) with 2 ns bins and 0.5 ns steps, using vertical excitation polarization to intentionally induce photoselection (note that because of the time step and bin width, early-time bins fall within instrument response).
