Multi-Color Magnetic Circularly Polarized Luminescence from Achiral Perovskite (Cs⁺Pb²⁺X₃) Quantum Dots

High-performance optoelectronic materials require luminescent materials capable of intense photoluminescence (PL). However, controlling the optical properties of luminescent materials requires complex synthesis and purification procedures. Herein, we propose a simple method for obtaining circularly polarized luminescence from achiral inorganic quantum dots. This method involves applying north-up and south-up 1.7 T magnetic fields at 25 degrees C to five types of achiral antimagnetic perovskite-Pb-quantum dots in a solution state. The wavelengths of magnetic circularly polarized luminescence (MCPL) and PL of achiral perovskite-Pb quantum dots were successfully controlled according to the type and composition ratio of halogen ions. The magnitude of MCPL, g(MCPL), was on the order of |g(MCPL)|=10(-3) in a wavelength range of 406-697 nm. Although the perovskite-Pb-quantum dots were achiral, the rotation direction of the MCPL could be controlled by varying the direction of the applied magnetic field.