Solution-State Cooperative Luminescence Upconversion in Molecular Ytterbium Dimers
Résumé
Two homometallic ytterbium dimers are prepared and their solution-state photoluminescence and upconversion properties are investigated. Both complexes exhibit two-photon cooperative luminescence upconversion in the visible region (lambda(em) approximate to 510 nm) upon excitation into the near-infrared Yb F-2(5/2) <- F-2(7/2) absorption band at 980 nm. This miniaturization of the cooperative luminescence phenomenon down to just two Yb ions unequivocally proves the mechanistic origins of this process. Time-resolved measurements and excited-state modeling indicate the presence of a slow recombination of two singly excited ions Yb*Yb* into a virtual excited state, which ultimately gives rise to the observed emission at approximate to 510 nm.
Domaines
Chimie
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Advanced Optical Materials - 2022 - Soro - Solution‐State Cooperative Luminescence Upconversion in Molecular Ytterbium.pdf (2.04 Mo)
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