Ni2+ doping induced structural phase transition and photoluminescence enhancement of CsPbBr3
Source abstract
Abstract
All-inorganic CsPbBr3 perovskites exhibit great potential in optoelectronic application due to their outstanding physical properties for optoelectronics. However, the relatively low luminescence efficiency of the bulk CsPbBr3 crystal hampers its further application. Here, we report a facile method to enhance the optical efficiency of halide perovskite powder via doping the transition metal Ni ions. It is demonstrated that Ni doping results in the formation of the Cs(NiPb)Br3 alloy and also triggers the phase transition of CsPbBr3 from orthorhombic to cubic. Both the Cs(NiPb)Br3 alloy and cubic CsPbBr3 are found to contribute to the asymmetric photoluminescence (PL) spectra in the green-yellow light band. The splitting-peak fitting experiments for the overlapped PL spectrum based on the bi-Gaussian line model reveal that the Cs(NiPb)Br3 alloy dominates the contribution of the observed PL enhancement. The Ni2+ doping is also beneficial for optimizing the crystallinity of the CsPbBr3 perovskite, suppressing the nonradiative recombination and significantly enhancing the photoluminescence consequently. Our investigation provides a novel insight into the effect of environmentally friendly metal doping in perovskites.
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Research context
OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Optical properties and cooling technologies in crystalline materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University 1 , Kunming 650091, People’s Republic of China
School of Physics and Astronomy, Yunnan University 2 , Kunming 650091, People’s Republic of China
Centre for Translational Atomaterials, Swinburne University of Technology 3 , Hawthorn 3122, Australia
Funding
National Natural Science Foundation of China · Joint Foundation of Provincial Science and Technology Department-Double First-class Construction of Yunnan University · the Reserve Talents of Academic and Technical Leader Project · Young Top Talent Project of Yunnan Province · the Application Basic Research Project
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