Mechanism of luminescent enhancement in Ba2GdNbO6:Eu3+ perovskite by Li+   co-doping
  We investigated the Li+ ion incorporation in Ba2GdNbO6:Eu3+ perovskite by atomistic simulations based on energy minimization. We predicted the most probable sites occupied by Eu3+ and Li+ ions and the related charge-compensation mechanisms involved into these substitutions. The results show that the Eu3+ and Li+ ions are incorporated mainly at the Gd3+ site. In the Li+ ion case, there is a charge compensation by Nb_Gd antisite. The Crystal field parameters and the transition levels for the Eu3+ ion in the BGN:Eu3+ were calculated with basis on the simulated local symmetry of the Eu3+ site. The results show that the mechanism of luminescent properties enhancement is the symmetry distortion induced by the Li+ co-doping. 
Marcos Vinicius dos Santos Rezende, Mario Ernesto Giroldo Val\'erio,   Rodolpho Mouta, Eduardo Moraes Diniz, Carlos William ...
cond-mat.mtrl-sci