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Issue 7, 2018
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Rb+ cations enable the change of luminescence properties in perovskite (RbxCs1−xPbBr3) quantum dots

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Abstract

All-inorganic metal halide perovskites of the formulation ABX3 (where A is Cs+, B is commonly Pb2+, and X is a halide, X = Cl, Br, I) have been studied intensively for their unique properties. Most of the current studies focus on halogen exchange to modify the luminescence band gap. Herein we demonstrate a new avenue for changing the band gap of halide perovskites by designing mixed-monovalent cation perovskite-based colloidal quantum dot materials. We have synthesized monodisperse colloidal quantum dots of all-inorganic rubidium–cesium lead halide perovskites (APbBr3, A = mixed monovalent cation systems Rb/Cs) using inexpensive commercial precursors. Through the compositional modulation, the band gap and emission spectra are readily tunable over the visible spectral range of 474–532 nm. The photoluminescence (PL) of RbxCs1−xPbBr3 nanocrystals is characterized with excellent (NTCS color standard) wide color gamut coverage, which is similar to the cesium lead halide perovskites (CsPbX3, X = mixed halide systems Cl/Br), and narrow emission line-widths of 27–34 nm. Furthermore, simulated lattice models and band structures are used to explain the band gap variations.

Graphical abstract: Rb+ cations enable the change of luminescence properties in perovskite (RbxCs1−xPbBr3) quantum dots

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Publication details

The article was received on 19 Oct 2017, accepted on 12 Jan 2018 and first published on 15 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR07776A
Nanoscale, 2018,10, 3429-3437

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    Rb+ cations enable the change of luminescence properties in perovskite (RbxCs1−xPbBr3) quantum dots

    H. Wu, Y. Yang, D. Zhou, K. Li, J. Yu, J. Han, Z. Li, Z. Long, J. Ma and J. Qiu, Nanoscale, 2018, 10, 3429
    DOI: 10.1039/C7NR07776A

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