Structure and Luminescent Properties of Mechanochemically Obtained Mn2+-Doped Hybrid Perovskites CH3NH3PbHal3 (Hal = Cl, Br)

Abstract

A series of Mn²⁺ -doped hybrid perovskites MAPb_1-xMn_xHal₃ (MA = CH₃NH₃, Hal = Cl and Br in different ratios, x = 0.33, 0.5, 0.67, 0.8) was obtained for the first time by mechanochemical synthesis. It is shown that materials obtained retain the perovskite structure even at the highest content of manganese ions (x = 0.8), and their structural and optical characteristics are mainly determined by the Cl/Br ratio. It is established that dispersions in toluene and nanocomposite films in polystyrene exhibit the intense photoluminescence (PL) due to the formation of pseudo-2D nanoparticles as a result of the ultrasonic disintegration of powders in an organic solvent. It is shown that the PL spectra of dispersions and nanocomposite films based on MAPb_1–xMn_xCl₃ are characterized by the appearance of an additional emission band from Mn²⁺ ions in the red region of the spectrum, due to which it is possible to increase the PL quantum yield from 0.2% (for the undoped sample) to 6.3% (films) and 10.2% (dispersions).