Effect of the Concentration of SrAl₂O₄: Eu²⁺and Dy³⁺ (SAO) on Characteristics and Properties of Environment-Friendly Long-Persistent Luminescence Composites from Polylactic Acid and SAO

Figure 5

SEM images of fractures for (a) pure PLA, (b) 5 wt% SAO/PLA, (c) 10 wt% SAO/PLA, (d) 15 wt% SAO/PLA, and (e) 20 wt% SAO/PLA.

(a)

(b)

(c)

(d)

(e)