Doping-Enhanced Short-Range Order of Perovskite Nanocrystals for Near-Unity Violet Luminescence Quantum Yield

• DOI: 10.1021/jacs.8b04763
• Publication Date: 2018-07-16T07:30:34Z
• Authors: Zi-Jun Yong; Shao-Qiang Guo; Ju-Ping Ma; Jun-Ying Zhang; Zhi-Yong Li; Ya-Meng Chen; Bin-Bin Zhang; Yang Zhou; Jie Shu; Jia-Li Gu; Li-Rong Zheng; Osman M. Bakr; Hong-Tao Sun
• Keywords: Quantum yield

All-inorganic perovskite nanocrystals (NCs) have emerged as a new generation of low-cost semiconducting luminescent system for optoelectronic applications. The room-temperature photoluminescence quantum yields (PLQYs) these NCs in the green and red spectral range approach unity. However, their PLQYs violet are much lower, an insightful understanding such poor performance remains missing. We report general strategy synthesis all-inorganic violet-emitting with near-unity through engineering local order lattice by nickel ion doping. A broad experimental characterizations, including steady-state time-resolved luminescence spectroscopy, X-ray absorption spectra, magic angle spinning nuclear magnetic resonance reveal that low PLQY undoped is associated short-range disorder induced intrinsic defects halide vacancies Ni doping can substantially eliminate result increased lattice. Density functional theory calculations perovskites causes increase defect formation energy does not introduce deep trap states band gap, which suggested to be main reason improved structural PLQY. Our ability obtain near-perfect properties opens door applications perovskite-based devices light-emitting diodes, single-photon sources, lasers, beyond.