Journal
OPTICS LETTERS
Volume 35, Issue 9, Pages 1305-1307Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.001305
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- Army Research Laboratory [W911NF-06-2-0032]
- National Science Foundation (NSF) [CHE-0449598]
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The singlet excited-state lifetime of a bipyridyl platinum(II) complex containing two alkynyl-benzothiazolylfluorene units was determined to be 145+/-105 ps by fitting femtosecond transient difference absorption data, and the triplet quantum yield was measured to be 0.14. A ground-state absorption cross section of 6.1 x 10(-19) cm(2) at 532 nm was deduced from UV-visible absorption data. Excited-state absorption cross sections of (6.7+/-0.1) x 10(-17) cm(2) (singlet) and (4.6+/-0.1) x 10(-16) cm(2) (triplet) were obtained by using a five-level dynamic model to fit open-aperture Z scans at picosecond and nanosecond pulse widths and a variety of pulse energies. For this complex, the ratio of the triplet excited-state absorption cross section to the ground-state absorption cross section-long used as a figure of merit for reverse saturable absorbers-thus stands at 754, to our knowledge the largest ever reported at 532 nm wavelength. (C) 2010 Optical Society of America
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