Analysis of cadmium-based pigments with time-resolved photoluminescence

Cesaratto, Anna; D’Andrea, Cosimo; Nevin, Austin; Valentini, Gianluca; Tassone, F.; Alberti, R.; Frizzi, T.; Comelli, Daniela

doi:10.1039/c3ay41585f

Cited by 51 publications

(43 citation statements)

References 25 publications

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“…The same approach could be extended to the analysis of modern pigments and paintings, allowing an in-depth investigation of the emission properties of organic and inorganic artist materials, including Cd-based pigments, in a combined way [13,21].…”

Section: Discussionmentioning

confidence: 99%

Dual wavelength excitation for the time-resolved photoluminescence imaging of painted ancient Egyptian objects

et al. 2016

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Background:The scientific imaging of works of art is crucial for the assessment of the presence and distribution of pigments and other materials on surfaces. It is known that some ancient pigments are luminescent: these include pink red-lakes and the blue and purple pigments Egyptian Blue (CaCuSi 4 O 10 ), Han blue (BaCuSi 4 O 10 ) and Han purple (BaCuSi 2 O 6 ). Indeed, the unique near-infrared luminescence emission of Egyptian blue allows the imaging of its distribution on surfaces. Results:We focus on the imaging of the time-resolved photoluminescence of ancient Egyptian objects in the Burri Collection from the Civic Museum of Crema and of the Cremasco (Italy). Time-resolved photoluminescence images have been acquired using excitation at 355 nm for detecting the ns-emission of red lakes and binding media; by employing 532 nm excitation Egyptian blue is probed, and the spatial distribution of its long-lived microsecond emission is imaged. For the first time we provide data on the photoluminescence lifetime of Egyptian blue directly from objects. Moreover, we demonstrate that the use of a pulsed laser emitting at two different wavelengths increases the effectiveness of the lifetime imaging technique for mapping the presence of emissions from pigments on painted surfaces. Laser-induced luminescence spectra from different areas of the objects and traditional digital imaging, using led-based lamps, long pass filters and a commercial photographic camera, complement the results from photoluminescence lifetime imaging. We demonstrate the versatility of a new instrumental setup, capable of recording decay emission kinetics with lifetimes from nanosecond to microseconds. Conclusions:While the combined wavelength approach for the imaging of emissions from different materials has been demonstrated for the study of ancient Egyptian pigments (both organic and inorganic), the method could be extended to the analysis of modern pigments and paintings.

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Section: Discussionmentioning

confidence: 99%

Dual wavelength excitation for the time-resolved photoluminescence imaging of painted ancient Egyptian objects

et al. 2016

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“…Our attention focused on the photoluminescence emissions from the band edge (E g ) and the first deep trap state (E t1 ) [19,42], respectively related to the crystal lattice and to defects and vacancies present in it. The time-resolved analysis permitted a deeper study of this class of pigments compared to the spectrally resolved results obtained in previous studies [6,42].…”

Section: Case Studiesmentioning

confidence: 99%

Time-Resolved Photoluminescence Spectroscopy and Imaging: New Approaches to the Analysis of Cultural Heritage and Its Degradation

Nevin

Cesaratto

Bellei

et al. 2014

Sensors

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Applications of time-resolved photoluminescence spectroscopy (TRPL) and fluorescence lifetime imaging (FLIM) to the analysis of cultural heritage are presented. Examples range from historic wall paintings and stone sculptures to 20th century iconic design objects. A detailed description of the instrumentation developed and employed for analysis in the laboratory or in situ is given. Both instruments rely on a pulsed laser source coupled to a gated detection system, but differ in the type of information they provide. Applications of FLIM to the analysis of model samples and for the in-situ monitoring of works of art range from the analysis of organic materials and pigments in wall paintings, the detection of trace organic substances on stone sculptures, to the mapping of luminescence in late 19th century paintings. TRPL and FLIM are employed as sensors for the detection of the degradation of design objects made in plastic. Applications and avenues for future research are suggested.

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“…In order to better understand the origin of their color and luminescence in the paint layer, recent studies [14,15,16,17,18] have focused on luminescence emission lifetimes of luminescent materials. Cd-and Zn-based pigments were characterized [17] both by a rapid picosecond lifetime band gap emission related to pigment composition and by further radiative relaxation decay paths due to trap state levels connected to the presence of intrinsic and extrinsic defects.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Cd-yellow paints: Ab initio study of native defects in {10.0} surface CdS

Giacopetti

Satta

2016

Microchemical Journal

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Analysis of cadmium-based pigments with time-resolved photoluminescence

Cited by 51 publications

References 25 publications

Dual wavelength excitation for the time-resolved photoluminescence imaging of painted ancient Egyptian objects

Dual wavelength excitation for the time-resolved photoluminescence imaging of painted ancient Egyptian objects

Time-Resolved Photoluminescence Spectroscopy and Imaging: New Approaches to the Analysis of Cultural Heritage and Its Degradation

Degradation of Cd-yellow paints: Ab initio study of native defects in {10.0} surface CdS

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