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Photos of the 3D-printed silica glass doped with (a) Eu3+, (b) Tb3+, and (c) Ce3+ ions, and their luminescent performance under a 254 nm UV lamp are shown in (d–f). Photos of selected-area-doped silica glass under (g) natural light and (h) 254 nm UV radiation. Scale bar: 5 mm [75].
