Abstract

The multicolor intense visible emission from ${\mathrm{Er}}^{3+}$ and ${\mathrm{Tm}}^{3+}$ ions codoped in ${\mathrm{TeO}}_2–\mathrm{PbO}$ glass upon excitation at $\sim 1064\mathrm{nm}$ radiation from a nanosecond pulsed Nd:YAG laser has been investigated. The optical parameters of erbium ions codoped in ${\mathrm{Tm}}^{3+}–{\mathrm{TeO}}_2–\mathrm{PbO}$ glass by using the Judd–Ofelt theory have been determined from the optical absorption spectra. No upconversion (UC) emission was seen in the singly doped ${\mathrm{Er}}^{3+}$-doped glass upon excitation at 1064 nm. Through the experiments, it has been found that, in the codoped glass, the UC luminescence from ${\mathrm{Er}}^{3+}$ (2.0 mol. %) in green and red regions corresponding to the ${{}^2\mathrm{H}}_{11/2}\to {{}^4\mathrm{I}}_{15/2}$, ${{}^4\mathrm{S}}_{3/2}\to {{}^4\mathrm{I}}_{15/2}$, and ${{}^4\mathrm{F}}_{9/2}\to {{}^4\mathrm{I}}_{15/2}$ transitions is strengthened about $\sim 40$, $\sim 60$, and $\sim 130$ fold, respectively, at 2.0 mol. % ${\mathrm{Tm}}^{3+}$ ion concentration in codoped glass. The observed UC emissions and the enhancement observed in their intensity have been explained on the basis of efficient energy transfer and cross-relaxation energy transfer processes.

© 2014 Optical Society of America

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