High spatial dynamics-photoluminescence imaging reveals the metallurgy of the earliest lost-wax cast object
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15 novembre 2016
- handle: 10670/1.4wddq7
- hal: hal-01487174
- doi: 10.1038/ncomms13356
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info:eu-repo/semantics/altIdentifier/doi/10.1038/ncomms13356
info:eu-repo/semantics/OpenAccess
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Photoluminescence Archaeology Manufacturing Indus Imaging Deep ultraviolet ZnO Semiconductor -mat]/Materials Science [cond-mat.mtrl-sci]Sujets proches
Natural science Sciences Science of science Diseases--ImagingCiter ce document
Mathieu Thoury et al., « High spatial dynamics-photoluminescence imaging reveals the metallurgy of the earliest lost-wax cast object », HAL-SHS : archéologie, ID : 10.1038/ncomms13356
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Résumé
Photoluminescence spectroscopy is a key method to monitor defects in semiconductors from nanophotonics to solar cell systems. Paradoxically, its great sensitivity to small variations of local environment becomes a handicap for heterogeneous systems, such as are encountered in environmental, medical, ancient materials sciences and engineering. Here we demonstrate that a novel full-field photoluminescence imaging approach allows accessing the spatial distribution of crystal defect fluctuations at the crystallite level across centimetre-wide fields of view. This capacity is illustrated in archaeology and material sciences. The coexistence of two hitherto indistinguishable non-stoichiometric cuprous oxide phases is revealed in a 6,000-year-old amulet from Mehrgarh (Baluchistan, Pakistan), identified as the oldest known artefact made by lost-wax casting and providing a better understanding of this fundamental invention. Low-concentration crystal defect fluctuations are readily mapped within ZnO nanowires. High spatial dynamics-photoluminescence imaging holds great promise for the characterization of bulk heterogeneous systems across multiple disciplines.