Polymer Monoliths Containing Two-Photon Absorbing Phenylenevinylene Platinum(II) Acetylide Chromophores for Optical Power Limiting.
A series of platinum(II) acetylide complexes containing p-phenylenevinylene and moieties end-capped with triphenylamine groups have been incorporated into poly(methyl methacrylate) (PMMA) monoliths for optical power limiting applications. The one- and two-photon photophysical properties were investigated and compared to the photophysical properties in THF. The absolute two-photon absorption cross-section values for the monolith samples were measured and are comparable to the values obtained in solution. In the PMMA monoliths, the complexes retained the important two-photon absorption and reverse saturable absorption properties necessary for optical power limiting via dual mode mechanism, and their strong nonlinear absorption property was demonstrated by the open-aperture Z-scan method. Photostability studies of the p-phenylenevinylene platinum(II) acetylide complexes showed two photodegradation processes: a trans-to-cis isomerization and a singlet-oxygen sensitized self-oxidative cleavage. The photostability of the least photostable complex TPV0 was increased upon incorporation into a PMMA matrix.
†Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.
Randi S
RS
Price
†Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.
Galyna
G
Dubinina
‡Department of Physics, Montana State University, Bozeman, Montana 59717, United States.
Geoffrey
G
Wicks
‡Department of Physics, Montana State University, Bozeman, Montana 59717, United States.
Mikhail
M
Drobizhev
‡Department of Physics, Montana State University, Bozeman, Montana 59717, United States.
Aleksander
A
Rebane
†Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.
Kirk S
KS
Schanze
nonlinear absorption; optical power limiting; platinum(II) acetylide; reverse-saturable absorption; two-photon absorption