Ultrahigh photo-stable all-inorganic perovskite nanocrystals and their robust random lasing. Issue 2 (3rd February 2020)

• Record Type: Journal Article
• Authors: Yang, Liuli; Wang, Ting; Min, Qiuhong; Pi, Chaojie; Li, Fan; Yang, Xiao; Li, Kongzhai; Zhou, Dacheng; Qiu, Jianbei; Yu, Xue; Xu, Xuhui
• Is Part Of: Nanoscale advances. Volume 2:Issue 2(2020)
• Page Start: 888
• Page End: 895
• Publication Date: 2020-02-03
• Subjects: 620.5
• DOI: 10.1039/c9na00775j
• Languages: English
• ISSNs: 2516-0230

Abstract

Abstract : Photo-instability has prevented further commercialization of all-inorganic perovskite nanocrystals (NCs) in the field of high-power optoelectronics. Abstract : Photo-instability has prevented further commercialization of all-inorganic perovskite nanocrystals (NCs) in the field of high-power optoelectronics. Here, an accelerated transformation process from non-luminescent Cs4 PbBr6 to CsPbBr3 NCs with bright green emission is explored with irradiation at 365 nm during 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. The robust emission output of the as-obtained CsPbBr3 NCs is well preserved even when recorded after 160 min. Moreover, a long-term stable random lasing could be achieved when excited using an ∼800 nm femtosecond laser for at least 8.6 × 10 7 laser shots. Our results not only elucidate the photo-induced accelerated phase transformation process of the all-inorganic perovskites, but also open up opportunities to synthesize highly stable CsPbBr3 NCs for their practical application in photovoltaics and optoelectronics.