The effect of room temperature magnetic field on photoluminescence of Mn:CsPbBr₃ quantum dots prepared by one-pot method in air

The generation and manipulation of spin-polarized electrons at room temperature are essential for the development of advanced spin-optoelectronic devices. In this work, a one-pot method was used to successfully synthesize homogenous Mn:CsPbBr₃ perovskite quantum dots in air with particle sizes of 7−8 nm. The effects of Mn doping on the structure, optical and magnetic properties of CsPbBr₃ quantum dots were investigated. The findings demonstrated proper Mn doping improved the crystallinity and photoluminescence (PL) of quantum dots. The prepared quantum dots have a narrow full width at half maximum emission (FWHM) of about 17−20 nm. The magnetic properties of the doped samples and the effect of the magnetic field on the PL spectra properties were analyzed. The results show that trace Mn doping can improve the room-temperature ferromagnetism of CsPbBr₃ quantum dots. Doping with magnetic elements makes CsPbBr₃ quantum dots more responsive to the applied magnetic field. Even at a lower 50 mT magnetic field, the PL peak of Mn:CsPbBr₃ still declined 5.91%. Mn:CsPbBr₃ quantum dots are a new type of multifunctional material that is beneficial to spintronics research. This work demonstrates a low-cost synthesis method. It should make all-inorganic perovskite quantum dots a promising material for room-temperature spin optoelectronic devices.