Enhancement of upconversion intensity in Er3+ doped tellurite glass in presence of Yb3+
TeO2-PbO glasses doped/codoped with Er3+/Er 3+-Yb3+ ions have been fabricated by melting and quenching method. Efficient frequency upconversion emissions spanning from blue to red regions corresponding to the 2H11/2, 4S 3/2→4I15/2 and 4F 9/2→4I15/2 transitions, respectively, upon excitation with 976 nm diode laser radiation have been observed. The variations observed in the intensity of whole upconversion emission spectra due to the presence of the Yb3+ ions are reported and discussed in detail.
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