CaCuSi4O10 and BaCuSi4O10 are among the most ancient artificial pigments known as Egyptian Blue and Han Blue, respectively. Alkaline earth copper silicate-based pigments are compounds of interest from a historical point of view, thanks to their interesting near-infrared (NIR) photoemission. It is well recognized that the emission originates from the Cu2+ d−d transitions inside the chromophore group [CuO4]6−; however, the optical properties are slightly different, probably related to a variation in the local structure.
Structure Dynamics and Vibronic Coupling in AECuSi4O10 (AE: Ca, Sr, Ba) Compounds.
Emmanuela Di Giorgio;Emanuela Sartori;Marta Campolucci;Maurizio Ferretti;Federico Locardi
2024-01-01
Abstract
CaCuSi4O10 and BaCuSi4O10 are among the most ancient artificial pigments known as Egyptian Blue and Han Blue, respectively. Alkaline earth copper silicate-based pigments are compounds of interest from a historical point of view, thanks to their interesting near-infrared (NIR) photoemission. It is well recognized that the emission originates from the Cu2+ d−d transitions inside the chromophore group [CuO4]6−; however, the optical properties are slightly different, probably related to a variation in the local structure.
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