Figure 2
Time evolutions and spectra of the luminescence from TlBiSe2.
(a) Time evolution curves of the luminescence intensities at photon energies from 0.25 eV to 1.0 eV (indicated near the left end of each curve) with 1.55 eV-photoexcitation. The curves are normalized at their own maxima and offset for clarity of display. The curves at photon energies lower than bulk band gap energy of 0.35 eV are shown in blue. The blue arrows indicate the peak position of each curve. The inset shows the peak position time and the decay time evaluated with a single exponential fitting for each decay curve. (b) Time-resolved luminescence spectra from 0.5 ps to 3.5 ps. Here, each spectrum is an integration within the time window of 0.2 ps that is nearly equal to the time resolution of the measurement system.
