@article{articlee66602ac,
title   = {Efficient green and red upconversion emissions in 'Er POT. 3+'/'Yb POT. 3+' co-doped Zn'Al IND. 2''O IND. 4' phosphor obtained by combustion reaction},
author = {de Camargo, Andrea Simone Stucchi and Nunes, Luiz Antônio de Oliveira and Silva, J. F. and Costa, A. C. F. M. and Barros, B. S. and Silva, J. E. C. and Sá, G. F.},
year = {2007},
journal   = {Journal of Physics: Condensed Matter}
}