Studying the Effect of Mn Doping on Structural and Photophysical Properties of Morpholinium Lead Bromide Perovskite.

Organic-inorganic lead halide perovskite is under intense focus on developing different optoelectronic devices because of its exceptional optical and electrical properties and ease of processing. However, the Pb toxicity and the luminescence instability of these classes of semiconductors require continuous development of newer luminescent variants. Herein, Mn is used as a dopant in luminescent morpholinium lead bromide perovskite, (CHNO)PbBr, to substitute Pb with Mn with varied doping percentage to develop two different analogs of Mn-doped (CHNO)PbBr with varied optical properties. The incorporation of the dopant ion is investigated using various characterization techniques like inductively coupled plasma-optical emission spectroscopy, single-crystal and powder X-ray diffraction, infrared, and electron paramagnetic resonance spectroscopies. The photophysical properties are characterized by absorption and emission spectroscopies. With the increase in Mn-dopant amount, the emission maxima showed a blueshift with respect to the pristine sample and exhibited an enhanced (about 40%) photoluminescence quantum yield. Finally, the possibility of utilizing these semiconductors for practical applications is conducted by studying the structural and photophysical properties after embedding them into an optically transparent polymer, polymethyl methacrylate.