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

摘要

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 Cs3Cu2I5 under room temperature via solid-state reaction. In addition to original self-trapped emission of Cs3Cu2I5 at 445 nm, Mn dopant introduced characteristic emission at similar to 550 nm and realized dual color emission tuned by feeding ratio, extending chroma of Cs3Cu2I5 in blue region. Meanwhile, ultraviolet photo-electron spectra results confirmed that Mn2+ ion replacing Cu+ resulted in p-type doping in Cs3Cu2I5. The as-prepared Mn:Cs3Cu2I5 microcrystals show excellent stability with almost unchanged PL intensity within 15 days.