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. 2022 Jan 27;13:553. doi: 10.1038/s41467-022-28220-z

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — A One photon excitation (solid purple line) and two-photon excitation (maroon dots) spectra (λ_em = 615 nm) of modified Eu:BPEPC. B Excitation power dependency (green diamonds) of the 2PE induced photo luminescence (PL) intensity, slope 1.84 ± 0.1, σ² = 144.5 ± 3 GM (10⁻⁵⁰ cm⁴s/photon). C One (λ_ex = 365 nm, solid red line) and two-photon (λ_ex = 720 nm, solid blue line) induced emission spectrum of the depicted (insert) Λ- and Δ Eu:BPEPC. D One photon and (insert) two-photon CPL spectra of Λ- and Δ-modified Eu:BPEPC (solid black and red line respectively). Spectra recorded in MeOH.