Si4+-doped BaZr(BO3)2:Eu3+ phosphors are prepared by a conventional solid-state reaction method.Because of the stronger electronegativity of Si4+ than Zr4+,the charge transfer state(CTS) of Eu3+-O2-shifts to higher energy location when Zr4+ is substituted by Si4+.The doping of Si4+ ion decreases the coordination number of Eu3+,which improves the energy transfer rates between Eu3+ and O2-.The intensity parameters calculated according to Judd-Ofelt theory show that the Eu3+ ion is located in a more asymmetric...