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Materials 2017, 10(4), 340; doi:10.3390/ma10040340

A Photoluminescence Study of the Changes Induced in the Zinc White Pigment by Formation of Zinc Complexes

1
Physics Department, Politecnico di Milano, Piazza Leonardo da Vinci, 20133 Milano, Italy
2
Chemistry, Materials and Chemical Engineering “Giulio Natta” Department, Politecnico di Milano, Piazza Leonardo da Vinci, 20133 Milano, Italy
3
Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci, 20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Hubertus T. Hintzen and Benjamin Dierre
Received: 22 February 2017 / Revised: 15 March 2017 / Accepted: 21 March 2017 / Published: 25 March 2017
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Abstract

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. View Full-Text
Keywords: time-resolved photoluminescence; zinc white; zinc carboxylate; metal soap time-resolved photoluminescence; zinc white; zinc carboxylate; metal soap
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MDPI and ACS Style

Artesani, A.; Gherardi, F.; Nevin, A.; Valentini, G.; Comelli, D. A Photoluminescence Study of the Changes Induced in the Zinc White Pigment by Formation of Zinc Complexes. Materials 2017, 10, 340.

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