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A time-dependent luminescent phosphor of Na2Ba2Si2O7:Eu for multi-level encryption and dynamic information display
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Qiwei Zhang1,2(
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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.
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A time-dependent luminescent phosphor of Na2Ba2Si2O7:Eu for multi-level encryption and dynamic information display
), Qiwei Zhang1,2(
),
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.
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Acknowledgements
This work was sponsored by the National Natural Science Foundation of China (Nos. 52062042 and 12164005) and the Central Government Guidance Funds for Local Scientific and Technological Development of China (No. Guike ZY22096024).
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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).
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