A photoluminescence study of the changes induced in the zinc white pigment by formation of zinc complexes

Artesani, Alessia, Gherardi, Francesca, Nevin, Austin , Valentini, Gianluca and Comelli, Daniela (2017) A photoluminescence study of the changes induced in the zinc white pigment by formation of zinc complexes. Materials, 10 (4). p. 340. ISSN 1996-1944

Full content URL: http://dx.doi.org/10.3390/ma10040340

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It is known that oil paintings containing zinc white are subject to rapid degradation. This is caused by the interaction between the active groups of binder and the metal ions of the pigment, which gives rise to the formation of new zinc complexes (metal soaps). Ongoing studies on zinc white paints have been limited to the chemical mechanisms that lead to the formation of zinc complexes. On the contrary, little is known of the photo-physical changes induced in the zinc oxide crystal structure following this interaction. Time-resolved photoluminescence spectroscopy has been applied to follow modifications in the luminescent zinc white pigment when mixed with binder. Significant changes in trap state photoluminescence emissions have been detected: the enhancement of a blue emission combined with a change of the decay kinetic of the well-known green emission. Complementary data from molecular analysis of paints using Fourier transform infrared spectroscopy confirms the formation of zinc carboxylates and corroborates the mechanism for zinc complexes formation. We support the hypothesis that zinc ions migrate into binder creating novel vacancies, affecting the photoluminescence intensity and lifetime properties of zinc oxide. Here, we further demonstrate the advantages of a time-resolved photoluminescence approach for studying defects in semiconductor pigments.

Additional Information:This article belongs to the Special Issue Techniques and Methods for Advanced Characterization of Luminescent Materials
Keywords:time-resolved photoluminescence, zinc white, zinc carboxylate, metal soap
Subjects:F Physical Sciences > F200 Materials Science
Divisions:College of Science > School of Chemistry
ID Code:28953
Deposited On:04 Oct 2017 14:40

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