Density-Functional Theory Study of the Optoelectronic Properties of {\pi}-Conjugated Copolymers for Organic Light-Emitting Diodes

TL;DR

This study uses density functional theory to investigate the optoelectronic properties of novel low-band-gap copolymer oligomers with D-A architecture, aiming to improve materials for organic light-emitting diodes.

Contribution

It introduces new low-band-gap copolymer oligomers with specific D-A structures and analyzes their electronic and optical properties using DFT calculations.

Findings

Predicted structural and electronic parameters of the copolymers

Identified charge transfer characteristics between donor and acceptor units

Analyzed optical absorption spectra supporting charge transfer processes

Abstract

Novel low-band-gap copolymer oligomers are proposed on the basis of density functional theory (DFT) quantum chemical calculations of photophysical properties. These molecules have an electron donor-accepter (D-A) architecture involving poly(3-hexylthiophene-2,5-diyl) (P3HT) as D units and furan, aniline, or hydroquinone as A units. Structural parameters, electronic properties, highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gaps and molecular orbital densities are predicted. The charge transfer process between the D unit and the A unit one is supported by analyzing the optical absorption spectra of the compounds and the localization of the HOMO and LUMO.