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(a) PA spectrum is shown and PA peak is at . A diode laser is used to be the pumping source. The absorption of PFO at is very high, but the absorption of at this wavelength is very weak. The temperature is at . (b) The PA frequency modulation of PFO triplet exciton in three different doping conditions. The modulation of 10% DCJTB doped PFO is identical with pure PFO. The fitted lifetime is . The lifetime of 10% doped PFO triplet exciton is decreased to . The solid lines are the theoretical fitting curves. Note that the PA intensity of doped PFO is higher than that of pure PFO. The inset in (a) are the chemical structures of PFO, , and DCJTB in the top and from left to right, respectively.
The PA frequency-modulation curve of PF triplet exciton. 0.02 and are the PF triplet exciton lifetimes in 3% doped PF and pure PF, respectively. The lower inset shows the exciton energy levels of polyfluorene and the transitions. The upper inset is the chemical structure of PF. The temperature is at , and PA peak is at .
Intersystem enhancement factor is plotted as a function of doping concentration. The inset is the PA intensity and fitted triplet exciton lifetime. is proportional to the former divided by the latter.
PL intensity of the blue emission from PFO host at different doping concentrations. The inset is the PL spectrum.
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