Luminescence from two different crystallographic sites in Sr_6BP_5O_(20):Eu~(2+)

摘要

The time resolved luminescence and concentration quenching behavior were examined for Sr_6BP_5O_(20):Eu~(2+) phosphors. The emission spectrum of the Sr_6BP_5O_(20):Eu~(2+) phosphor could be deconvoluted into two well defined Gaussian peaks. This implies that the Eu~(2+) emission emanates from two different crystallographic sites for Sr~(2+) ions. Each deconvoluted Gaussian peak was assigned to its corresponding Sr~(2+) 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 Sr_6BP_5O_(20):Eu~(2+) phosphors, when they are to be applied to blue components in plasma display panels.