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.

It’s hard for pure perovskite quantum dots (QDs) to maintain long-term and stable optical properties in practical conditions. Here, CsPbBr3 QDs were first stabilized in amorphous SiO2 and crystalline hexagonal boron nitride (h-BN) nanosheets. The transmission electron microscopy (TEM) images display the laminated structure consisting of CsPbBr3/SiO2 nanospheres and h-BN nanosheets. Besides, the photoluminescence (PL) intensity of CsPbBr3/SiO2/h-BN nanohybrid only has a slight decrease than CsPbBr3/SiO2 nanocomposite. But, dual protection of SiO2 and h-BN give perovskite QDs better humidity stability and thermal stability. Besides, CsPbBr3/SiO2/h-BN block exhibits excellent water-resistance. This work provides a novel method to accelerate the application of perovskite QDs in optoelectronic devices.

In this paper, the CsPbBr 3 quantum dot solid powder with excellent luminescence performance was prepared by using APTES and APTMS as silane by simple normal temperature method, and the influence of Cs + concentration on its luminescence performance and stability was studied in detail. With the increase of Cs/Pb ratio, PL wavelength shows redshift slightly. Proper Cs/Pb ratio is crucial to quantum yield, and the stability of quantum dot powder is improved under Cs-rich condition. This work offers a good guideline for the preparation of CsPbBr 3 quantum dot power for LED illumination and display.

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