Photoluminescence properties of zinc white: an insight into trap state levels of historical samples.

Artesani A., Bellei S., Capogrosso V., Cesaratto A., Mosca S., Nevin A., Comelli D., Valentini G.
  Mercoledì 28/09   10:00 - 13:00   Edificio Psicologia 2 - Aula 3G   VI - Fisica applicata, Acceleratori e Beni Culturali
We propose an in-depth study of zinc white pigments based on time-resolved photoluminescence analysis. While the photo-physical properties of ZnO as nanostructures have been widely explored, only few papers have dealt with bulk materials as those present in artist pigments. The study is based on the analysis of valuable ZnO-based historical pastels (20th C), and of the pure commercial Zinc White pigment. Our approach has allowed the characterization of the spectral and decay-kinetic properties of emissions from the direct band-gap recombination and a variety of relaxation phenomena, which include near-band-edge and monomolecular recombination.