Editing Stokes shift (section)

=== Yttrium oxysulfide ===
[[Yttrium]] oxysulfide ({{Chem2|Y2O2S}}) doped with [[gadolinium oxysulfide]] ({{Chem2|Gd2O2S}}) is a common industrial anti-Stokes [[pigment]], absorbing in the [[Infrared#Regions within the infrared|near-infrared]] and emitting in the visible region of the spectrum.<ref>{{Cite journal |last=Georgobiani |first=A. N. |last2=Bogatyreva |first2=A. A. |last3=Ishchenko |first3=V. M. |last4=Manashirov |first4=O. Ya. |last5=Gutan |first5=V. B. |last6=Semendyaev |first6=S. V. |date=2007-10-01 |title=A new multifunctional phosphor based on yttrium oxysulfide |url=https://doi.org/10.1134/S0020168507100093 |journal=Inorganic Materials |language=en |volume=43 |issue=10 |pages=1073–1079 |doi=10.1134/S0020168507100093 |issn=1608-3172|url-access=subscription }}</ref> This composite material is often utilized in luminescent applications, where it absorbs lower-energy photons and emits higher-energy photons. This unique property makes it particularly valuable in various technological fields, including security printing, anti-counterfeiting measures, and luminescent displays. By harnessing anti-Stokes fluorescence, this pigment enables the creation of vibrant and durable inks, coatings, and materials with enhanced visibility and authentication capabilities.