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Room temperature PL spectra of lanthanide(III)-doped 1 in the solid state upon excitation at 370 nm: black, Tb-doped 1; blue, Eu-doped 1; red, Eu- and Tb co-doped 1.The insets are the optical photographs of 1, Eu@1, Tb@1 and Eu/Tb@1 excited under 365 nm ultraviolet lamps, corresponding to the letters N, E, N and U, respectively.
