Abstract Luminescent emission from artworks is usually employed by conservators and restorers as a visual and quick method for assessing the presence of protective varnishes and restoration materials, as well to evaluate the painting conservation status. Besides these mere qualitative observations, the analysis of both spectral and temporal features of the optical emission from a painting can provide useful information about the pictorial materials employed by artists. In this work we propose Multi-spectral Time-gated Photoluminescence Imaging to differentiate between luminescent pigments, on the basis of their different emission spectra and lifetimes. We present the application of the approach on two modern paintings from Fondazione Maimeri Private Collection, on which we differently probe the fast-living emission from surface varnish and lake pigment and the long-living trap state emissions from different semiconductor pigments. With the aid of the time gated detection we record the trap state emission of semiconductor pigments, otherwise covered by the intense fluorescence of the organic compound. The method is complemented with Macro-XRF analysis, to confirm the nature of the identified inorganic pigments, as zinc white and cadmium yellow. The protocol represents a rapid, non-invasive and reliable way for assessing the identification of luminescent pigments and their spatial distribution.

中文翻译：

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现代绘画的光致发光成像：微秒时间尺度的大量信息

摘要 艺术品的发光通常被保护人员和修复人员用作评估保护清漆和修复材料的存在以及评估绘画保护状态的直观且快速的方法。除了这些纯粹的定性观察之外，对绘画光发射的光谱和时间特征的分析可以提供有关艺术家使用的绘画材料的有用信息。在这项工作中，我们提出了多光谱时间门控光致发光成像，以根据不同的发射光谱和寿命来区分发光颜料。我们展示了该方法在 Fondazione Maimeri 私人收藏的两幅现代画作上的应用，我们不同地探讨了表面清漆和色淀颜料的快速发射以及不同半导体颜料的长寿命陷阱态发射。借助时间门控检测，我们记录了半导体颜料的陷阱态发射，否则会被有机化合物的强荧光覆盖。该方法辅以宏观 XRF 分析，以确认已识别的无机颜料的性质，如锌白和镉黄。该协议代表了一种快速、非侵入性和可靠的方法，用于评估发光颜料的识别及其空间分布。否则被有机化合物的强烈荧光覆盖。该方法辅以宏观 XRF 分析，以确认已识别的无机颜料的性质，如锌白和镉黄。该协议代表了一种快速、非侵入性和可靠的方法，用于评估发光颜料的识别及其空间分布。否则被有机化合物的强烈荧光覆盖。该方法辅以宏观 XRF 分析，以确认已识别的无机颜料的性质，如锌白和镉黄。该协议代表了一种快速、非侵入性和可靠的方法，用于评估发光颜料的识别及其空间分布。