Green and red upconversion emission from 'Er POT.3+'/'Yb POT.3+'-doped Si'O IND.2'-'Ta IND.2''O IND.5'planar waveguides - Ferrari, J. L.; Lima, K. O.; Ferreira, R. A. S.; Carlos, L. D.; Gonçalves, Rogéria Rocha (Brazilian Meeting on Inorganic Chemistry, 2010)