Raman spectroscopy-based method for evaluating LED illumination-induceddamage to pigments in high-light-sensitivity art
2020
Because commonly used organic pigments are highly responsive to
visible light, high-light-sensitivity art is vulnerable to irreversible
illumination-induced damage caused by radiation from light sources. With
application of the four primary white light-emitting diodes (fp-WLEDs) in
museums, it is urgent to evaluate the illumination-induced damage to
high-light-sensitivity art caused by the fp-WLEDs. Four narrowband LEDs
with different peak wavelengths of 450, 510, 583, and 650 nm that
constitute the spectra of the fp-WLEDs were used to irradiate three
commonly used organic pigments: safflower, gamboge, and indigo. Based on
the fundamental reason for the illumination-induced damage, that is,
photochemical reactions, Raman spectroscopy was introduced into the study.
The Raman spectra of pigments were measured before and after illumination.
The characteristic Raman peaks corresponding to the functional groups that
determine color and structure of pigments were selected, and the
variations in their peak intensities were calculated. The
illumination-induced damage coefficients of four narrowband LEDs on three
organic pigments were obtained, providing a data basis for
illumination-induced damage evaluation equation proposed in this study,
which was expected to further realize museum admission evaluation of the
new fp-WLEDs.
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