Abstract
ABX 3 -type halide perovskite nanocrystals (NCs) have been a hot topic recently due to their fascinating optoelectronic properties. It has been demonstrated that A-site ions have an impact on their photophysical and chemical properties, such as the optical band gap and chemical stability. The pursuit of halide perovskite materials with diverse A-site species would deepen the understanding of the structure–property relationship of the perovskite family. In this work we have attempted to synthesize rubidium-based perovskite NCs. We have discovered that the partial substitution of Rb + by Cs + help to stabilize the orthorhombic RbPbBr 3 NCs at low temperature, which otherwise can only be obtained at high temperature. The inclusion of Cs + into the RbPbBr 3 lattice results in highly photoluminescent Rb 1−x Cs x PbBr 3 NCs. With increasing amounts of Cs + , the band gaps of the Rb 1−x Cs x PbBr 3 NCs decrease, leading to a redshift of the photoluminescence peak. Also, the Rb 1−x Cs x PbBr 3 NCs (x=0.4) show good stability under ambient conditions. This work demonstrates the high structural flexibility and tunability of halide perovskite materials through an A-site cation substitution strategy and sheds light on the optimization of perovskite materials for application in high-performance optoelectronic devices.
Original language | English |
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Pages (from-to) | 2597-2603 |
Number of pages | 7 |
Journal | Chemistry - A European Journal |
Volume | 25 |
Issue number | 10 |
DOIs | |
Publication status | Published - 18 Feb 2019 |
Keywords
- cation substitution
- lead halide perovskite
- nanocrystals
- optical properties
- perovskite phases
- rubidium