Back to Search
Start Over
A time-dependent luminescent phosphor of Na2Ba2Si2O7:Eu for multi-level encryption and dynamic information display
- 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