Preparation and Research of Perovskite Quantum Dots Powder Based on RbCl Doped CsPbBr₃

Abstract

Researchers have achieved precise control of the size of quantum dots by using the quantum confinement effect. Rb+ and Cs+ with similar ionic radii have become a new mechanism for researchers to regulate the emission wavelength of quantum dots. However, there are few studies on the performance of codoped quantum dots with ion at present. By adding a saturated solution of RbCl into an organic solution of CsPbBr3, quantum dots doped with Rb+ and Cl− were prepared. The prepared quantum dots realized adjustable emission spectrum (457‐510 nm), stable lattice structure, and good stability under ultraviolet light irradiation. Therefore, double ion doping is a new method to prepare short‐wavelength of quantum dots.

Recent Progress in Mixed A‐Site Cation Halide Perovskite Thin‐Films and Nanocrystals for Solar Cells and Light‐Emitting Diodes

“…The mixed A‐cation LHP NCs can be synthesized directly using the mixture of desired A‐cation precursors or by applying post‐synthetic A‐cation exchange and cross‐exchange on pre‐synthesized mono‐cation LHP NCs, as illustrated in Figure . The direct synthesis can be carried out by classical methods such as hot‐injection [ 48–175 ] or reprecipitation [ …”

“…[14,47,61,160] However, unlike thin films, colloidal LHP NCs with precise tunability of the A-cation composition are relatively less explored. [14,75] The mixed A-cation perovskite NCs can be classified into three categories: 1) all-inorganic if the A-cation composition is made of Cs + , Na + , K + , and Rb + , [163][164][165][166][167][168][169][170] 2) all-organic if the A-cation composition is made of a mixture of MA + and FA + , [171,172] 3) organic-inorganic hybrid if the A-cation composition is made of both organic and inorganic cations. [47,[59][60][61]160,173,174] The most common mixed A-cation perovskite NCs consist of different combinations of Cs + , MA + , and FA + .…”