期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 206, 期 2-3, 页码 188-197出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2009.06.007
关键词
TPA; TPF; Solvent polarity; Vibronic coupling; Figure-of-merit
资金
- Ministry of Commn. & Info. Tech., Govt. of India
- Dept. of Science and Technology, Govt. of India
- Wellcome Trust Foundation (UK)
For a series of rhodamine dyes, two-photon absorption (TPA) and two-photon fluorescence (TPF) have been performed in different solvents. Solvent-dependent TPA spectra of these dyes were measured with open aperture z-scan method and compared to their respective single-photon spectra at equivalent energies. In the TPA spectra, relative peak intensities and positions are highly solvent dependent, which could be a result of vibronic couplings that depend on solvent environment. Measured TPA cross-sections of rhodamine dyes are consistently higher in nonpolar solvents. Certain complementary and similarity between TPA and TPF are also elucidated. Finally, a two-photon figure-of-merit is presented for these dyes in different solvents as a function of wavelength. (C) 2009 Elsevier B.V. All rights reserved.
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