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Femtosecond ground state recovery: Measuring the intersystem crossing yield of polyspirobifluorene
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View: Figures


Image of FIG. 1.
FIG. 1.

Femtosecond transient photobleaching apparatus, as used to measure the rapid recovery of the ground state absorption following photobleaching.

Image of FIG. 2.
FIG. 2.

The apparatus used for the measurement of the nanosecond transient photobleaching and photoinduced absorption.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

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).

Image of FIG. 6.
FIG. 6.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Femtosecond ground state recovery: Measuring the intersystem crossing yield of polyspirobifluorene