Two-Photon Absorption Properties of New Fluorene-Based Singlet Oxygen Photosensitizers

The degenerate two-photon absorption (2PA) spectra of several fluorene-based photosensitizers (PS) in solution were obtained over a broad spectral range (460−880 nm) by open aperture Z-scan and two-photon fluorescence methods under either picosecond or femtosecond excitation, respectively. A maximum...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2009-03, Vol.113 (11), p.4706-4711
Main Authors: Belfield, Kevin D, Bondar, Mykhailo V, Hernandez, Florencio E, Masunov, Artëm E, Mikhailov, Ivan A, Morales, Alma R, Przhonska, Olga V, Yao, Sheng
Format: Article
Language:English
Subjects:
C: Electron Transport, Optical and Electronic Devices, Hard Matter
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Summary:The degenerate two-photon absorption (2PA) spectra of several fluorene-based photosensitizers (PS) in solution were obtained over a broad spectral range (460−880 nm) by open aperture Z-scan and two-photon fluorescence methods under either picosecond or femtosecond excitation, respectively. A maximum 2PA cross section of ca. 300 GM was observed for the photosensitizers containing a benzothiazole substituent in the fluorenyl 7-position. The electronic structures and 2PA properties of these PS were analyzed using a time-dependent density functional theory method, resulting in reasonably good agreement between experimental and theoretical data.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp8102832