Upconversion luminescence characteristics of a multi-rare-earth-doped 0.05K2O-0.1ZnO-0.1BaO-0.2PbO-0.2GeO2-0.35TeO2 glass have been investigated under 976nm excitation for potential use in full colour displays.Two luminescence ions, Er3+ and Tm3+, were used as blue, green and red emitters to control the colour of the emitted light. Sensitizer ions, Yb3+, were used to increase the upconversion emission intensity. With the substitution of Er3+ for Tm3+, the intensities of the blue, green and 657nm upconversion emissions simultaneously increase.