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

Rongbo Ma,Xinyong Gong,Chaoyong Deng,Weichao Huang

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.