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(a) Crystal structure of FAGPbI4. (b) Octahedral coordination of lead ions. (c) A photograph of typical crystals (elipsoids shown at 50% probability). (d) Photographs of a FAGPbI4 crystal taken under day light and under UV illumination in dark. (e) Kubelka–Munk function F(R∞) = (1 – R∞)2/2R∞ (R∞, diffusive reflectance) and (f) temperature-dependent PL spectra measurements performed on powdered crystals.
