Cooperative Sensitization Upconversion in Ytterbium(III)‐Based Eosin Lake Pigments

Materials based on organic chromophores and lanthanides able to transform low‐energy photons, specifically near‐infrared (NIR) photons, into higher energy photons to eventually lead to long‐lived sensitized emission of the dye are highly desirable. Cooperative sensitization (CS) upconversion has onl...

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Veröffentlicht in:ChemPhotoChem 2023-10, Vol.7 (10)
Hauptverfasser: Cevallos‐Toledo, Rita B., Bellezza, Delia, Ferrera‐González, Juan, Giussani, Angelo, Ortí, Enrique, González‐Béjar, María, Pérez‐Prieto, Julia
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container_issue 10
container_start_page
container_title ChemPhotoChem
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creator Cevallos‐Toledo, Rita B.
Bellezza, Delia
Ferrera‐González, Juan
Giussani, Angelo
Ortí, Enrique
González‐Béjar, María
Pérez‐Prieto, Julia
description Materials based on organic chromophores and lanthanides able to transform low‐energy photons, specifically near‐infrared (NIR) photons, into higher energy photons to eventually lead to long‐lived sensitized emission of the dye are highly desirable. Cooperative sensitization (CS) upconversion has only been accomplished for lanthanide‐based clusters. We used here the eosin Y (EOS) dianion and Yb 3+ (EOS‐Yb), and demonstrate the efficient CS emission of the dye after NIR excitation. Remarkably, the EOS dianion emission exhibits a nearly linear dependence on the EOS‐Yb concentration and a quadratic dependence on the laser power density. The emission is non‐sensitive to oxygen and its lifetime lasts about 1.76 μs and 12 μs in DMSO and DMSO‐ d 6 , respectively. Moreover, the effect of temperature (293–363 K range) on the EOS‐Yb 1 H NMR spectroscopic shifts demonstrates the reversible dynamic nature of the material.
doi_str_mv 10.1002/cptc.202300156
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title Cooperative Sensitization Upconversion in Ytterbium(III)‐Based Eosin Lake Pigments
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