In the article the glass with molar composition of 75TeO 2 -20ZnO-5Na 2 O co-doped with Yb 3+ /Tm 3+ /Ho 3+ ions was fabricated by typical melt-quenching technique. Multicolour up-conversion emission at the wavelengths of 479 nm (blue), 546 nm (green) and 650 nm (red) corresponding to transitions 1 G 4 → 3 H 6 (Tm 3+ ), 5 F 4 → 5 I 8 (Ho 3+ ) and 5 F 5 → 5 I 8 (Ho 3+ ), respectively have been observed under infrared excitation (λ exc = 980 nm) at room temperature. Influence of molar ratio of active ions on the colour coordinates (CIE-1931) have been investigated.
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