Enhancing Orange-red Emission by Doping/codoping CsPb2Br5 with Cations through a Room-temperature Aqueous-phase Synthesis

Despite the rising advances in the field of all-inorganic CsPb2Br5-based materials and their photoelectronic applications, the exploitation of facile synthetic procedures and enhancement of optical properties remain challenging. Herein, we report a facile room-temperature aqueous phase synthesis of orange-red-emitting cation-doped and codoped CsPb2Br5 materials with enhanced photoluminescence (PL) performance and stability. Only very weak broad PL peak at around 618 nm is observed in the undoped CsPb2Br5 microsheets. However, doping with Cu, and codoping with Cu/Mn, Cu/Zn or Cu/Cd significantly enhance the PL intensity of the resulting CsPb2Br5-based samples. The stability of the representative Cu-doped and various codoped CsPb2Br5 is evaluated under various conditions such as soaking in water, high temperature up to 150oC, and ambient environment at room temperature. This work provides facile and cost-effective path for large-scale and controlled synthesis of orange-red emmisive CsPb2Br5-based materials with enhanced optical performances, excellent environmental stability, and potentials in LEDs.