Abstract
A method of core–shell-like gradient permeation of Er3+ on the surface of grain was used to prepare xEr3+-Bi0.5Na0.5TiO3 ceramics. The structure and photoluminescence properties were investigated both on the gradient and homogenous doping. The XRD patterns exhibited a single rhombohedra phase. The photoluminescence measurements showed a maximum value at x = 1.5 wt% for the gradient xEr3+-Bi0.5Na0.5TiO3 ceramics, and a maximum value at x = 2.0 wt% for the homogenous one, also critical concentrations of elimination of segregation of large strip grains. Significantly, an enhanced efficiency of bright green emission at about 550 nm was observed in the gradient Er3+-Bi0.5Na0.5TiO3 ceramics. In structure a critical concentration of elimination of segregation of large strip grains corresponds to the highest PL peak. The possible mechanism was discussed that concentration quenching effect is supposed due to the degeneration effect of multi-rare earth ions to allow energy transfer accompany with non-radiative loss. Gradient concentration will cause gradient overlapping energy levels to restrict energy transfer to enhance luminescence effect.
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Cao, W.Q., Wang, R.L., Zhou, F.L. et al. Enhance luminescence property of Er in Bi0.5Na0.5TiO3 ceramics by gradient permeation method. Appl. Phys. A 123, 693 (2017). https://doi.org/10.1007/s00339-017-1298-2
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DOI: https://doi.org/10.1007/s00339-017-1298-2