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In the current work, a novel class of (Ca0.9Si0.1)Al2O6:Eu2+,Nd3+ longpersistent phosphor was synthesized using high-temperature (1000-1500oC)solid-state reaction method. Further, the phosphor material was formulated intoa phosphorescent ink using epoxy based colloidal suspension. Interestingly thephosphorescent ink absorbs ambient energies such as white light from D65 andtungsten lamps, sunlight, artificial lights etc., stores up the energy and emitas efficient blue colored photoluminescence (PL) apparently visible for manyhours for dark adapted human eye. However, the optimum PL emission centred at~450 nm has been registered at ~365 nm excitation that is attributed totransitions from 4f65d1 to 4f7 energy levels of Eu2+ ions. The longerpersistence of PL aroused due to trapping and de-trapping of holes at Nd3+sites situated proximate to valance band. In the optimised stoichiometriccomposition of the phosphor, the persistence lasted for >4 hours in extremelydark conditions. Furthermore, the phenomenon of long persistence enables tocreate/design unique hidden markings on goods and certificates using quickresponse (QR) code patterns. Systematic studies have been performed on varioustemplates kept under UV (~365 nm) excitation to identify fake currencies,barcodes and combat counterfeiting effectively.

Probing blue long persistent Eu2+/Nd3+ activated  (Ca$_{0.9}$Si$_{0.1}$)Al$_2$O$_6$ emerging phosphor based novel invisible ink  for knocking out fake security papers and combat counterfeiting