Optical Property of Inorganic Halide Perovskite Hexagonal Nanocrystals

Abstract

Inorganic halide perovskite nanocrystals (NCs) exhibit many excellent optical and semiconductor properties. Herein, CsPbBr3 hexagonal NCs (HNCs) have been synthesized, and their photophysical behavior has been investigated in detail. The CsPbBr3 cubic NCs (CNCs) act as references. The CsPbBr3 HNCs exhibit apparent linear and two-photon fluorescence properties, and their two-photon absorption cross section is 4668.7 GM. In addition, the energy band, radiative channel, and carrier recombination of CsPbBr3 HNCs have been analyzed compared to those of CsPbBr3 NCs by changing the temperature and pressure. The photoluminescence (PL) property of CsPbBr3 HNCs is always better than that of CsPbBr3 CNCs since their electron–hole bimolecular recombination related to PL is much rapid. Our results provide comprehensive insights into the photophysical properties of inorganic halide perovskite nanomaterials and examine their potential in the optoelectronic field.

Investigation of highly luminescent inorganic perovskite nanocrystals synthesized using optimized ultrasonication method

“…This specificity can form hexagonal PeNCs, which are different from the typical square crystals. It was found that the PL behavior of hexagonal PeNCs is usually better than that of typical square-shaped PeNCs [26] . These characteristics can be analyzed indirectly by density functional theory (DFT) calculation etc.…”

Surfactant-tail control of CsPbBr3 nanocrystal morphology

“…While most perovskite nanocrystals (NCs) exhibit a cubic morphology, recent studies have demonstrated the ability to fine-tune the intrinsic optical and catalytic properties of lead bromide perovskite NCs by precisely controlling facet growth and shape. 11 In this vein, synthetic efforts to modulate the shape of CsPbBr 3 NCs have been extensively carried out, either by the addition of other metals like Cd and Mn, 12 by lowering the injection temperature, by post synthetic modifications of Cs 4 PbBr 6 NCs, 13 or by changing the commonly used long-chain ligands to short-chain amines. 14 However, few reports focus on studying the effect of other surfactants than OAm/OA as capping ligands in the facet growth of CsPbBr 3 NCs.…”

Theoretical and Experimental Advances in High-Pressure Behaviors of Nanoparticles

“…(H, I) pressure dependence of monomolecular recombination rate (H) and bimolecular recombination rate (I) of CsPbBr 3 hexagonal NCs and CNCs. Reproduced with permission from ref . Copyright 2021 American Chemical Society.…”