Effects of Cs⁺ Concentration on the Optical Properties and Stability of Perovskite Quantum Dots

Abstract

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.

Investigation on Photoluminescence of CsPb(Br,I)3 Perovskite Nanocrystals by Comparison between Hot-Injection and Ion-Exchange Methods

“…CsPbBr 3 perovskite nanocrystal (NC) is a fascinating nanophosphor because of its excellent photoluminescence (PL) properties, 1 including green emission with a sharp peak, a high PL quantum yield (PLQY), and good durability when compared with organic-inorganic perovskite phosphors. As a result, many researchers have been attracted to investigations of this material, [2][3][4][5] and recent work has contributed to its development. [6][7][8][9] The ability to tune the emission wavelength of the material by changing the bandgap through halide composition is expected to open a wide range of applications.…”

“…Volumes of halide solutions used in the ion-exchange methods.Iodide ratio x in CsPb(Br 1−x I x )3 Added PbI 2 solution (ml) to CsPbBr 3 NC dispersion Added PbBr 2 solution (ml) to CsPbI 3 NC dispersion…”