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A time-dependent luminescent phosphor of Na2Ba2Si2O7:Eu for multi-level encryption and dynamic information display

Authors :
Jie Shao
Xiyang Li
Meng Liu
Haiqin Sun
Qiwei Zhang
Dengfeng Peng
Fuchi Liu
Source :
Journal of Advanced Ceramics, Vol 13, Iss 4, Pp 429-436 (2024)
Publication Year :
2024
Publisher :
Tsinghua University Press, 2024.

Abstract

Photo-stimuli responsive materials show great potential in the fields of information encryption and storage due to their distinctive spatial or temporal color changes. However, the conventional single or multi-color static outputs by light stimulus difficulty meet practical requirements for high-security optical storage technologies. Here, a novel dynamic irradiation-responsive phosphor of Na2Ba2Si2O7:Eu is demonstrated, exhibiting high storage stability and convenient readout behaviors. The inherent Eu2+ luminescence can be dynamically tuned, instantly read out, and conveniently erased by controlling irradiation duration of a portable diode laser (365 nm). The modulation mechanism is unraveled by optically induced oxidation reactions of Eu2+→Eu3+ and defects as killer centers. The excellent luminescence modulation degree (ΔRt = 89.5%) and the accompanying larger color contrast enable the creation of invisible optical codes with multi-level encryption in bright or dark field. These results indicate potential applications of Na2Ba2Si2O7-based materials in information encryption and invisible optical storage, and are expected to expand more investigations on optically induced PL modulation behaviors based on mixed valences and defects.

Details

Language :
English
ISSN :
22264108 and 22278508
Volume :
13
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Journal of Advanced Ceramics
Publication Type :
Academic Journal
Accession number :
edsdoj.838115f72a47e19b245bf2cd5ee307
Document Type :
article
Full Text :
https://doi.org/10.26599/JAC.2024.9220865