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Materials 2017, 10(11), 1335; doi:10.3390/ma10111335

Time-Resolved Photoluminescence Microscopy for the Analysis of Semiconductor-Based Paint Layers

1
Physics Department, Politecnico di Milano, Piazza Leonardo da Vinci, 20133 Milano, Italy
2
Istituto di Fotonica e Nanotecnologie-Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci, 20133 Milano, Italy
3
Centre de Recherche et de Restauration des Musées de France (C2RMF), Palais du Louvre, F-75001 Paris, France
4
Chimie Paris-Tech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), F-75005 Paris, France
*
Author to whom correspondence should be addressed.
Received: 29 September 2017 / Revised: 9 November 2017 / Accepted: 18 November 2017 / Published: 21 November 2017
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Abstract

In conservation, science semiconductors occur as the constituent matter of the so-called semiconductor pigments, produced following the Industrial Revolution and extensively used by modern painters. With recent research highlighting the occurrence of various degradation phenomena in semiconductor paints, it is clear that their detection by conventional optical fluorescence imaging and microscopy is limited by the complexity of historical painting materials. Here, we illustrate and prove the capabilities of time-resolved photoluminescence (TRPL) microscopy, equipped with both spectral and lifetime sensitivity at timescales ranging from nanoseconds to hundreds of microseconds, for the analysis of cross-sections of paint layers made of luminescent semiconductor pigments. The method is sensitive to heterogeneities within micro-samples and provides valuable information for the interpretation of the nature of the emissions in samples. A case study is presented on micro samples from a painting by Henri Matisse and serves to demonstrate how TRPL can be used to identify the semiconductor pigments zinc white and cadmium yellow, and to inform future investigations of the degradation of a cadmium yellow paint. View Full-Text
Keywords: time-resolved photoluminescence; photoluminescence microscopy; semiconductor pigments; trap state levels; zinc white; cadmium yellow time-resolved photoluminescence; photoluminescence microscopy; semiconductor pigments; trap state levels; zinc white; cadmium yellow
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Comelli, D.; Artesani, A.; Nevin, A.; Mosca, S.; Gonzalez, V.; Eveno, M.; Valentini, G. Time-Resolved Photoluminescence Microscopy for the Analysis of Semiconductor-Based Paint Layers. Materials 2017, 10, 1335.

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