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. 2024 May 8;15:3846. doi: 10.1038/s41467-024-47674-x

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© The Author(s) 2024

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Fig. 4 — a The photographs of 4TPYBOH@PVA–Eu (left) and 4TPYBOH@PVA–Tb (right) RTP films that were prepared by being soaked in different Ln³⁺ concentrations (0.1–20 mg/mL) taken under and after removing the 254 nm UV irradiation. b The photographs of bimetallic Eu³⁺ and Tb³⁺-manipulated RTP materials with the increase of the ratio of Tb³⁺ taken under and after removing the 254 nm UV irradiation, the total Ln³⁺ concentration is 1 mg/mL.