Lead-free p-type Mn:Cs3Cu2I5 perovskite with tunable dual-color emission through room-temperature grinding method

Abstract Compared with widely studied lead halide perovskite, copper halide perovskite is toxic-free and combines better stability with comparable photoluminescence quantum yield. Cation doping has proven to be an effective way to manipulate optical and electronic properties of perovskite. Unlike lead halide perovskite able to act as the host of different kinds of dopant, copper halide perovskite acting as host material is still a great challenge. Herein, Mn was successfully doped into Cs \(_3\) Cu \(_2\) I \(_5\) under room temperature via solid-state reaction. In addition to original self-trapped emission of Cs \(_3\) Cu \(_2\) I \(_5\) at 445 nm, Mn dopant introduced characteristic emission at \(\sim \)  550 nm and realized dual color emission tuned by feeding ratio, extending chroma of Cs \(_3\) Cu \(_2\) I \(_5\) in blue region. Meanwhile, ultraviolet photo-electron spectra results confirmed that Mn \(^{2+}\) ion replacing Cu \(^+\) resulted in p-type doping in Cs \(_3\) Cu \(_2\) I \(_5\) . The as-prepared Mn:Cs \(_3\) Cu \(_2\) I \(_5\) microcrystals show excellent stability with almost unchanged PL intensity within 15 days. Graphical abstract Synthesis of p-type Mn:Cs3Cu2I5 with dual-color emission through room-temperature grinding method.