Efficient solution-processed light-emitting diodes based on organic-inorganic hybrid antimony halides.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41545384.
- Also identified by DOI 10.1038/s41467-026-68597-9 and PMC identifier 12923899.
- Licence recorded as CC BY-NC-ND.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Organic-inorganic hybrid antimony halides are emerging emitters for solution-processed light-emitting diodes. However, achieving high-efficiency electroluminescence remains challenging resulting from the non-radiative recombination within emitters and inferior charge transport within device. Here, we develop an organic cation engineering to design a carbazole-functionalized triphenyl(9-ethyl-9H-carbazol-3-yl) phosphonium (TPPEtCz<sup>+</sup>), which enables a (TPPEtCz)<sub>2</sub>Sb<sub>2</sub>Br<sub>8</sub> film with good luminescence and achieves an improved charge transport within device. The TPPEtCz<sup>+</sup> facilitates strong hydrogen bonding with the [Sb<sub>2</sub>Br<sub>8</sub>]<sup>2-</sup> species and dichloromethane solvent, resulting in a more complete crystal restructuring, thus improving the quality of films. Moreover, non-covalent π-π interactions between carbazole moieties of (TPPEtCz)<sub>2</sub>Sb<sub>2</sub>Br<sub>8</sub> and benzimidazole moieties of electron-transport TPBi modify the interfacial contact that promotes electron transport and injection. Consequently, our light-emitting diodes reach a peak external quantum efficiency of 19.4% and half-lifetime of 10,190 min at 100 cd m<sup>-2</sup>. These discoveries provide critical insights into the cation design of hybrid devices that are promising for practical applications.