@article{Shao2024, 
author = {Jie Shao and Xiyang Li and Meng Liu and Haiqin Sun and Qiwei Zhang and Dengfeng Peng and Fuchi Liu},
title = {A time-dependent luminescent phosphor of Na2Ba2Si2O7:Eu for multi-level encryption and dynamic information display},
year = {2024},
journal = {Journal of Advanced Ceramics},
volume = {13},
number = {4},
pages = {429-436},
keywords = {light irradiation, luminescent modulation, invisible optical storage},
url = {https://www.sciopen.com/article/10.26599/JAC.2024.9220865},
doi = {10.26599/JAC.2024.9220865},
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.}
}