Luminescent Carbazole-Based Eu and Yb Complexes with a High Two-Photon Absorption Cross-Section Enable Viscosity Sensing in the Visible and Near IR with One- and Two-Photon Excitation.

07:00 EST 13th February 2020 | BioPortfolio

Summary of "Luminescent Carbazole-Based Eu and Yb Complexes with a High Two-Photon Absorption Cross-Section Enable Viscosity Sensing in the Visible and Near IR with One- and Two-Photon Excitation."

The newly synthesized Eu and Yb complexes with the new carbazole-based ligands CPAD and CPAP display the characteristic long-lived metal-centered emission upon one- and two-photon excitation. The Eu complexes show the expected narrow emission bands in the red region, with emission lifetimes between 0.382 and 1.464 ms and quantum yields between 2.7% and 35.8%, while the Yb complexes show the expected emission in the NIR region, with emission lifetimes between 0.52 and 37.86 μs and quantum yields between 0.028% and 1.12%. Two-photon absorption cross sections (σ) as high as 857 GM were measured for the two ligands. The complexes showed a strong dependence of the one- and two-photon sensitized emission intensity on solvent viscosity in the range of 0.5-200 cP in the visible and NIR region.


Journal Details

This article was published in the following journal.

Name: Inorganic chemistry
ISSN: 1520-510X


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