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. 2021 Sep 4;10:131–144. doi: 10.1016/j.bioactmat.2021.08.030

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© 2021 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Fig. 2 — Persistent luminescence property. (a) Excitation and (b) emission spectra of CAO. (c) Afterglow decay curves of CAO powder after repeated excitation with white LED lamp. (d) Afterglow luminescence images of CAP and CAO after 10 min irradiation by a 365 nm UV lamp and 2 min re-activation of white LED lamp. (e) Emission spectra of CaAl₂O₄:Eu,Nd and CaAl₂O₄:Eu. (f) Scheme of persistent luminescence mechanism of CAO. The inset image refers to the powder of CAO under 365 nm UV irradiation. (g) Emission spectrum of CAP and UV–vis absorption spectra of verteporfin (Vp) and cyanobacteria.