Abstract

Femtosecond transient difference absorption (fs TA) measurements, together with a series of open-aperture $Z$ scans at picosecond and nanosecond pulse widths and a variety of pulse energies, were performed on a 1,10-phenanthrolinyl iridium(III) complex bearing ligands containing a benzothiazolylfluorenyl motif. An analysis of decay data from the fs TA experiment yields a value of $1.24\pm 0.26\mathrm{ns}$ for the singlet excited-state lifetime ${\tau }_S$ of the complex. By fitting the $Z$ scans to a five-level dynamic model incorporating the independently measured value of ${\tau }_S$ and previously reported values of the complex’s triplet quantum yield (0.13) and triplet excited-state lifetime (230 ns), we obtain values of $3.5\times {10}^{-17}{\mathrm{cm}}^2$ (singlet) and $5.0\times {10}^{-16}{\mathrm{cm}}^2$ (triplet) for the excited-state absorption cross-sections of the complex in toluene solution at 532 nm; the latter value represents one of the largest triplet excited-state absorption cross-sections ever reported at this wavelength. The ratio of the triplet excited-state cross-section to the ground-state absorption cross-section exceeds 3800.

© 2015 Optical Society of America

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