Rb+ cations enable the change of luminescence properties in perovskite (Rb: X Cs1- x PbBr3) quantum dots

Hao Wu, Yong Yang, Dacheng Zhou, Kuangran Li, Jie Yu, Jin Han, Zhencai Li, Zhangwen Long, Jiao Ma, Jianbei Qiu*


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42 Citationer (Scopus)


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.

Udgave nummer7
Sider (fra-til)3429-3437
Antal sider9
StatusUdgivet - 21 feb. 2018
Udgivet eksterntJa

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© 2018 The Royal Society of Chemistry.


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