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Photon upconversion sensitized by a Ru(II)-pyrenyl chromophore #MMPMID25987571
Deng F; Lazorski MS; Castellano FN
Philos Trans A Math Phys Eng Sci 2015[Jun]; 373 (2044): ä PMID25987571show ga
The near-visible-to-blue singlet fluorescence of anthracene sensitized by a ruthenium chromophore with a long-lived triplet-excited state, [Ru(5-pyrenyl-1,10-phenanthroline)3](PF6)2, in acetonitrile was investigated. Low intensity non-coherent green light was used to selectively excite the sensitizer in the presence of micromolar concentrations of anthracene generating anti-Stokes, singlet fluorescence in the latter, even with incident power densities below 500??W?cm?2. The resultant data are consistent with photon upconversion proceeding from sensitized triplet?triplet annihilation (TTA) of the anthracene acceptor molecules, confirmed through transient absorption spectroscopy as well as static and dynamic photoluminescence experiments. Additionally, quadratic-to-linear incident power regimes for the upconversion process were identified for this composition under monochromatic 488 nm excitation, consistent with a sensitized TTA mechanism ultimately producing the anti-Stokes emission characteristic of anthracene singlet fluorescence.