Fig. 4. Luminescent spectra of (a) Eu0.1Y0.9 and (c) Tb0.1Y0.9 upon the addition of various metal ions in DMF (λex = 275 nm); quenching efficiency values of (b) Eu0.1Y0.9 and (d) Tb0.1Y0.9 in DMF by different metal ions (1 × 10−2 M).
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