Multicolor up-conversion emission in tellurite glasses co-doped with rare earth ions for white LED applications

In the article the glass with molar composition of 75TeO2-20ZnO-5Na2O co-doped with Yb3+/Tm3+/Ho3+ 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 1G4 →3H6 (Tm3+), 5F4→5I8 (Ho3+) and 5F5→5I8 (Ho3+), respectively have been observed under infrared excitation (λexc = 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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