σ-Hammett parameter: A strategy to enhance both photo- and electro-luminescence features of heteroleptic copper(i) complexes

Michael D. Weber, Marta Viciano-Chumillas, Donatella Armentano, Joan Cano, Rubén D. Costa

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

This work studies the effect of the σ-Hammett parameter (σp)-i.e., the σ-donation effect caused by substitution at the para position of a bipyridine ligand (4,4′-R2bipy, where R is MeO, Me, H, NO2)-on both the photo- and electro-luminescence features of a series of heteroleptic copper(i) complexes-i.e., [Cu(N^N)(P^P)]+ where N^N and P^P ligands are R2bipy and Xantphos, respectively. By virtue of a comprehensive photophysical, theoretical, and thin-film lighting device-i.e., light-emitting electrochemical cells (LECs)-investigation, we note a clear relationship between the σp and the photo- and electro-luminescence parameters, such as photoluminescence quantum yields, excited-state lifetimes, and emission maxima, as well as device brightness, stability, and efficacy, respectively. As the most relevant finding, the substitution with the group featuring the most negative σp-i.e., MeO-provides a ca. five-fold enhancement of all of the aforementioned figures-of-merit upon comparison within the series of complexes. As such, this work provides a new guideline for a device optimization through a rational ligand design for heteroleptic copper(i) complexes.

Original languageEnglish
Pages (from-to)6312-6323
Number of pages12
JournalDalton Transactions
Volume46
Issue number19
DOIs
Publication statusPublished - 2017
Externally publishedYes

ASJC Scopus subject areas

  • Inorganic Chemistry

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