Study of downconversion process in Er3+/Yb3+ co-doped tellurite glasses - Figueiredo, M. S.; Santos, F. A.; Moraes, J. C. S.; Nunes, Luiz Antônio de Oliveira; Andrade, L. H. C.; Lima, S. M. (International Conference on Luminescence and Optical Spectroscopy of Condensed Matter - ICL, 2014)