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. However, controlling the optical properties of luminescent materials requires complex synthesis and purification procedures. Here, we propose a simple method for obtaining circularly polarized luminescence from achiral inorganic quantum dots. In the method, north‐up and south‐up 1.7 T magnetic fields are applied at 25°C to five types of achiral antimagnetic perovskite‐Pb‐quantum dots in solution state. The wavelengths of magnetic circularly polarized luminescence (MCPL) and photoluminescence (PL) of achiral perovskite‐Pb quantum dots could be successfully controlled according to the type and composition ratio of halogen ions. The magnitude of MCPL, gMCPL, was on the order of |gMCPL|= 10‐3 at 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.