Made available in DSpace on 2021-07-14T10:47:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2003-12. Added 1 bitstream(s) on 2021-07-14T11:38:23Z : No. of bitstreams: 1 S1516-14392003000400003.pdf: 595912 bytes, checksum: 4864b6bfb74f35fb337bd26a64336977 (MD5) Er-doped SnO2 thin films and xerogels are obtained by sol-gel technique. In order to understand the Er³+ rare-earth ion activity in SnO2 matrix, a characterization of Er incorporation is done through emission and excitation spectra of xerogels, besides thin film electrical characterization. Effects to grain dimensions are also analyzed based on X-ray diffraction data showing the particle growth with annealing temperature and inhibition of this growth by Er doping. Electrical characterization results suggest that Er³+ has an acceptor-like character in SnO2, and that codoping with Yb³+ allows an energy transfer process Yb³+ -> Er³+. Universidade Estadual Paulista, FC Universidade de São Paulo, Instituto de Física de São Carlos Universidade Estadual Paulista, Instituto de Química Araraquara Universidade Estadual Paulista, FC Universidade Estadual Paulista, Instituto de Química Araraquara