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A multi-analytical investigation of semi-conductor pigments with time-resolved spectroscopy and imaging

机译：用时间分辨光谱和成像技术对半导体颜料进行多分析研究

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We present the non-invasive study of historical and modern Zn- and Cd-based pigments with time-resolved fluorescence spectroscopy, fluorescence multispectral imaging and fluorescence lifetime imaging (FLIM). Zinc oxide and Zinc sulphide are semiconductors which have been used as white pigments in paintings, and the luminescence of these pigments from trapped states is strongly dependent on the presence of impurities and crystal defects. Cadmium sulphoselenide pigments vary in hue from yellow to deep red based on their composition, and are another class of semiconductor pigments which emit both in the visible and the near infrared. The Fluorescence lifetime of historical and modern pigments has been measured using both an Optical Multichannel Analyser (OMA) coupled with a Nd:YAG ns-laser, and a streak camera coupled with a ps-laser for spectrally-resolved fluorescence lifetime measurements. For Zn-based pigments we have also employed Fluorescence Lifetime Imaging (FLIM) for the measurement of luminescence. A case study of FLIM applied to the analysis of the painting by Vincent Van Gogh on paper - "Les Bretonnes et le pardon de Pont-Aven" (1888) is presented. Through the integration of complementary, portable and non-invasive spectroscopic techniques, new insights into the optical properties of Zn- and Cd-based pigments have been gained which will inform future analysis of late 19th and early 20th C. paintings.
机译：我们通过时间分辨荧光光谱，荧光多光谱成像和荧光寿命成像（FLIM），对历史和现代的Zn和Cd基颜料进行非侵入性研究。氧化锌和硫化锌是半导体，已被用作绘画中的白色颜料，这些颜料从俘获态的发光在很大程度上取决于杂质和晶体缺陷的存在。磺基硒化镉颜料的色相根据其组成从黄色到深红色不等，是另一类半导体颜料，可在可见光和近红外光中发射。使用光学多通道分析仪（OMA）结合Nd：YAG ns激光和带ps激光的条纹相机测量光谱分辨的荧光寿命，可以测量历史和现代颜料的荧光寿命。对于锌基颜料，我们还采用了荧光寿命成像（FLIM）来测量发光。介绍了一个FLIM的案例研究，该案例用于Vincent Van Gogh在纸上的绘画分析“ Les Bretonnes et le pardon de Pont-Aven”（1888年）。通过整合互补的，便携式的和非侵入性的光谱技术，已经获得了对基于锌和镉的颜料的光学特性的新见解，这些见解将为19世纪末和20世纪初的绘画提供参考。

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