Femtosecond transient photobleaching apparatus, as used to measure the rapid recovery of the ground state absorption following photobleaching.
The apparatus used for the measurement of the nanosecond transient photobleaching and photoinduced absorption.
Absorption (a), fluorescence (b), phosphorescence (c), and photoinduced absorption spectra of polyspirobifluorene in toluene solution, vertical lines mark the probe beams at 3.06 and as well as the pump beams at 3.2 and . The structure of the polymer is shown on the inset.
Double logarithmic presentation showing, (from top) the femtosecond decay component of the photobleaching, the nanosecond decay components of the photobleaching, the two photobleaching decays combined with a multiexponential fit to the data (hollow circles), and the transient triplet photoinduced absorption decay.
Recovery of the photobleaching of polyspirobifluorene in the solid state at room temperature (lower curve) and (middle curve), also shown is the decay of the singlet exciton (upper curve).
Comparison between the dynamics of the triplet photoinduced absorption signal (lower) and the ground state recovery on the nanosecond time scale (upper).
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