Figure 2:

Optical properties and switching performances of BA₂PbI₄.

(A) Real n (full lines) and imaginary k (dashed lines) parts of the refractive index of BA₂PbI₄ at 293 K (red curves) and 240 K (blue curves). (B) Comparison between the phase-change optical constants figure of merit (FOM_PC) of BA₂PbI₄ and Ge₂Sb₂Te₅ in the visible spectrum. (C) Photoluminescence spectra at 293 K (red curves) and 240 K (blue curves). (D) Phase-change photoluminescence figure of merit (FOM_PL) of BA₂PbI₄.