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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
): ? PMID25987571
show 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)](PF(6))(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.
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