Open AccessNonlinear optical characterization of multinuclear iridium compounds containing tricycloquinazoline
Author(s) -
William M. Shensky,
Michael J. Ferry,
Ryan M. O’Donnell,
Trenton R. Ensley,
Jianmin Shi
Publication year - 2016
Publication title -
applied optics
Language(s) - Uncategorized
Resource type - Journals
ISSN - 0003-6935
DOI - 10.1364/ao.56.00b179
Subject(s) - microsecond , nanosecond , excited state , iridium , picosecond , materials science , absorption spectroscopy , absorption (acoustics) , ultrafast laser spectroscopy , spectroscopy , ground state , laser , analytical chemistry (journal) , optics , chemistry , atomic physics , physics , biochemistry , quantum mechanics , chromatography , composite material , catalysis
Nonlinear optical properties were characterized for a series of multinuclear iridium compounds of the form TCQ[Ir III (ppz) 2 ] n , where n=1, 2, or 3, TCQ is tricycloquinazoline, and ppz is 1-phenylpyrazole. Transient absorption (TA) spectroscopy indicated that the triplet metal-to-ligand charge transfer excited state was formed on a subpicosecond time scale and decayed back to the ground state on a microsecond time scale, consistent with precedents in the literature. TA bands were observed for all three compounds from 475 to 900 nm, implying the potential for reverse-saturable absorption (RSA) at those wavelengths. Z-scan measurements using picosecond and nanosecond pulses were obtained at 532 nm and confirmed the presence of RSA behavior for all three compounds. The triplet excited state cross sections and the RSA figure of merit were found to decrease with increasing n:1>2∼3.