Ultrahigh Photo-stable All-Inorganic Perovskite Nanocrystals and Their Robust Random Lasing
Photo-instability has prevented further commercialization of all-inorganic perovskite nanocrystals (NCs) in the field of high-power optoelectronic applications. Here, an accelerated process from non-luminescent Cs4PbBr6 to be CsPbBr3 NCs with bright green emission is explored with the irradiation of 365 nm during the water-triggered structural transformation. The photoelectric field provided by the photon energy of 365 nm promotes the rapid stripping of CsBr and atomic reconstruction, contributing to the production of ultrahigh photo-stable defect-free CsPbBr3 NCs. Robust emission output of the as-obtained CsPbBr3 NCs is well preserved even recorded after 160 min, moreover, a long-term stable random lasing could be achieved excited by ~800 nm femtosecond laser for at least 8.6×107 laser shots. Our results not only elucidate the photo-induced the accelerated phase transformation process of the all-inorganic perovskites, but also open up opportunities to synthesize highly stable CsPbBr3 NCs for their practical applications in photovoltaics and optoelectronics.