Giant Improvement on the Afterglow of Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺ Phosphor by Systematic Investigation on Various Parameters

Figure 4

SEM microstructures of the Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺ phosphors prepared by adding different H₃BO₃ contents: (a) 0 mol%, (b) 20 mol%, (c) 40 mol%, and (d) 100 mol%.

(a)

(b)

(c)

(d)