The Anisotropic Complex Dielectric Function of CsPbBr₃ Perovskite Nanorods Obtained via an Iterative Matrix Inversion...

Area of Science:

• Materials Science
• Nanotechnology
• Optoelectronics

Background:

• Colloidal lead halide perovskites are promising optoelectronic materials.
• Understanding shape anisotropy's impact on their dielectric function is crucial for applications leveraging polarized light.
• CsPbBr3 nanorods exhibit unique optical properties due to their structure.

Purpose of the Study:

• To determine the anisotropy of the complex dielectric function of CsPbBr3 nanorods.
• To correlate shape anisotropy with optical properties like absorption and emission.
• To develop a method for analyzing anisotropic dielectric functions in colloidal nanostructures.

Main Methods:

• Analyzing ensemble absorption and spectral fluorescence anisotropy spectra.
• Utilizing an iterative matrix inversion (IMI) methodology.
• Distinguishing light absorption parallel and perpendicular to the nanorod axis.

Main Results:

• Quantum confinement induces axis-dependent electronic features in the dielectric function.
• Both particle shape and quantum confinement contribute to fluorescence anisotropy.
• The study successfully determined the anisotropic complex dielectric function.

Conclusions:

• The findings enhance understanding of perovskite nanorod optical behavior.
• The developed methodology is applicable to various colloidal materials.
• This work facilitates the design of optoelectronic devices utilizing polarized light emission and absorption.