Multiple anti-counterfeiting realized in NaBaScSi₂O₇ with a single activator of Eu²⁺

Abstract

Multiple encryption data encoding and decoding model of single activator ion luminescence.

Multiple‐response anti‐counterfeiting realized in CaYAl3O7 host with the dual coexistence of Eu2+/Eu3+

“…PL and PLE spectra of CYA: Eu and CYA: Eu, Nd recorded at 298 K are displayed in Figure , respectively. As shown in Figure A, the PLE spectrum monitored at 618 nm reveals a broad band with the maximum at 265 nm in the range of 200‐350 nm due to the charge transfer band (CTB) from Eu 3+ to O 2‐ ions, along with some sharp peaks in the range of 350‐425 nm related to the 4f‐4f transitions of Eu 3+ ions . A broad band with a peak at 337 nm in the range of 300‐400 nm related to the 5d‐4f transitions of Eu 2+ ions appears when monitored at 440 nm .…”

“…As shown in Figure 2A, the PLE spectrum monitored at 618 nm reveals a broad band with the maximum at 265 nm in the range of 200-350 nm due to the charge transfer band (CTB) from Eu 3+ to O 2ions, along with some sharp peaks in the range of 350-425 nm related to the 4f-4f transitions of Eu 3+ ions. 29,31 A broad band with a peak at 337 nm in the range of 300-400 nm related to the 5d-4f transitions of Eu 2+ ions appears when monitored at 440 nm. 31,32 The spectrum of CYA: Eu present a blue emission at 440 nm, which is attributed to 4f 6 5d 1 -4f 7 transition of Eu 2+ ions, combined with red emission at 590, 618, 650 and 704 nm are assigned to 5 D 0 -7 F 1, 2, 3, 4 of Eu 3+ ions under 365 nm excitation, as displayed in Figure 2B.…”

“…The coexistence of Eu 3+ and Eu 2+ ions is observed in CaYAl 3 O 7 host matrix, which would provide a dual mode of detected optical signal as expected. Moreover, a reconstructed trap structure could significantly improve the optical performance of phosphors, Nd 3+ ions as sensitizers to adjust crystal field environment and defect structure around emitting centers has been investigated . Herein, a potential anti‐counterfeiting application of CaYAl 3 O 7 : Eu 2+ /Eu 3+ , Nd 3+ with dynamic and static changes in color tuning is to be explored in this work.…”

A multicolor persistent luminescent phosphor Sr2Ga2GeO7:Pr3+ for dynamic anticounterfeiting

“…Owing to the unique property of “glow‐in‐the‐dark,” the PersL phosphors have attracted a widespread range of interests. Recently, PersL phosphors have been applied in various important fields, for example, the emergency lighting, optical storage, in vivo imaging, solar energy, and photocatalysis …”

“…Recently, PersL phosphors have been applied in various important fields, for example, the emergency lighting, optical storage, in vivo imaging, solar energy, and photocatalysis. [5][6][7][8] It is well known that a PersL phosphor consists of the host, emitters, and traps and the PersL color of a PersL phosphor usually depends on the emitters. Generally, the broadband emitters including d n TM and 5d-4f RE 3+ ions show the continuous emission bands in visible spectrum similar to the sunlight, and thus it is more suitable for lighting.…”