Bismuth-activated luminescence reversible modification of photochromic for multimodal anti-counterfeiting and optical storage application

Multifunctional luminescence material with photochromism and controllable luminescence modulation properties have attracted increasing interest, enabling innovative applications such as optical information storage and anti-counterfeiting. Herein, the Bi 3 + single-doped BaSrY 4 O 8 photochromic phosphor was prepared by the solid-state reaction method, and its crystal structure and optical properties were systematically investigated. Notably, this phosphor demonstrates reversible photochromic properties, accompanied by a rapid transition in body color from white to brown when exposed to 365 nm near-UV light, and considerable recovery capacity upon blue light (450 nm) irradiation. By the combination of photoluminescence and reversible photochromism, the application of optical memory and anti-counterfeiting is developed that depends on the different light stimulations. Moreover, the BaSrY 4 O 8 : Bi 3+ phosphor exhibits an intense blue broadband emission centered at 423 nm and good thermal stability (83 %@423 K). These results indicate that BaSrY 4 O 8 : Bi 3+ phosphor is a promising multifunctional luminescence material for applications in optical storage and anti-counterfeiting.