%0 Journal Article
%F self-archiving-INPE-MCTIC-GOV-BR
%@issn 1539-3755
%A Sousa D. F.,
%A Sampaio, J. A.,
%A Nunes, L. A. O.,
%A Baesso, M. L.,
%A Bento, A. C.,
%A Miranda, Luiz Carlos Moura,
%@affiliation Universidade de Sao Paulo
%@affiliation Instituto de Fisica, Universidade Estadual Maringa, Departamento de Fisica
%T Energy transfer and the 2.8-mu m emission of Er3+- and Yb3+-doped low silica content calcium aluminate
%B Physical Review E
%D 2000
%V 62
%N 5
%8 Aug.
%X The 2.8-mu m emission of Er3+-doped low silica content calcium aluminate glasses sensitized by Yb3+ is investigated using conventional spectroscopy. The experimental data are quantitatively analyzed in terms of the energy transfer among the Yb3+ and Er3+ ions. The energy transfer rate by dipole-quadrupole mechanism was inferred to be larger than by dipole-dipole mechanism. Using the Dexter model of energy transfer, the microscopic parameters of energy transfer by dipole-dipole mechanism were calculated. It was found that the Yb3+--> Er3+ energy transfer constant is 2.6 times greater than the back-energy transfer.
%P 3176-3180
%3 sousa_energy.pdf