Text this: Structure, Luminescence and Temperature Detection Capability of [C(NH<sub>2</sub>)<sub>3</sub>]M(HCOO)<sub>3</sub> (M = Mg<sup>2+</sup>, Mn<sup>2+</sup>, Zn<sup>2+</sup>) Hybrid Organic–Inorganic Formate Perovskites Containing Cr<sup>3+</sup> Ions
