Luminescence from two different crystallographic sites in Sr6BP5O20:Eu2+

The time resolved luminescence and concentration quenching behavior were examined for Sr6BP5O20:Eu2+ phosphors. The emission spectrum of the Sr6BP5O20:Eu2+ phosphor could be deconvoluted into two well defined Gaussian peaks. This implies that the Eu2+ emission emanates from two different crystallographic sites for Sr2+ ions. Each deconvoluted Gaussian peak was assigned to its corresponding Sr2+ crystallographic site with the assistance of density functional theory (DFT) calculations. The accurate assignment achieved by the DFT calculation will provide some basic guidelines for improving the color purity of Sr6BP5O20:Eu2+ phosphors, when they are to be applied to blue components in plasma display panels.