A blue silicate, cuprorivaite (CaCuSi4O10), with strong conversion of visible input to infrared emission at around 910 nm, was previously demonstrated for use as a micron scale powder for latent fingerprint imaging. In this research, we prepare a cuprorivaite powder and subject it to mechanochemical treatments that organically modify and exfoliate the material to produce a pigment ideal for ink formulation. The prepared ink was then used to print a security feature.
Jacob Petersen, Jeevan Meruga, Aravind Baride, Chandler Bogart, William Cross, Stanley May, Jon Kellar, "Visible-to-Infrared Converting CaCuSi4O10 Security Ink" in Proc. IS&T Printing for Fabrication: Int'l Conf. on Digital Printing Technologies (NIP33), 2017, pp 73 - 76, https://doi.org/10.2352/ISSN.2169-4451.2017.33.73