Bulk Assembly of Organic Metal Halide Nanoribbons

TL;DR

This paper reports the first synthesis of 1D organic metal halide nanoribbons with dual emission properties and explores their photophysical behavior and electronic structure.

Contribution

It introduces a novel 1D organic metal halide hybrid with nanoribbons and characterizes its dual photoluminescence emission for the first time.

Findings

Achieved synthesis of metal halide nanoribbons with three octahedral units width.

Demonstrated dual emission with 25% PLQE under UV light.

DFT calculations reveal coexistence of free and self-trapped excitons.

Abstract

Organic metal halide hybrids with low-dimensional structures at the molecular level have received great attention recently for their exceptional structural tunability and unique photophysical properties. Here we report for the first time the synthesis and characterization of a one-dimensional (1D) organic metal halide hybrid material, which contains metal halide nanoribbons with a width of three octahedral units. It is found that this material with a chemical formula C$_8$H$_{28}$N$_5$Pb$_3$Cl$_{11}$ shows a dual emission with a photoluminescence quantum efficiency (PLQE) of around 25% under ultraviolet (UV) light irradiation. Photophysical studies and density functional theory (DFT) calculations suggest the coexisting of delocalized free excitons and localized self-trapped excitons in metal halide nanoribbons leading to the dual emission. This work shows once again the exceptional tunability of organic metal halide hybrids that bridge between molecular systems with localized states and crystalline ones with electronic bands.