Stress-Induced Structural Phase Transition in Polystyrene/NaYF₄: Eu³⁺ Photoluminescent Electrospun Nanofibers

Figure 3

Illustration of the stress-induced phase transition of α-NaYF₄ to β-NaYF₄ crystal structure (red→ sodium (Na), green→ yttrium (Y), and sea green → fluorine (F)). (a) Crystal structure of -NaYF₄. (b) Crystal structure of -NaYF₄