One-Dimensional Chiral Copper Iodide Chain-Like Structure Cu4 I4 (R/S-3-quinuclidinol)3 with Near-Unity Photoluminescence Quantum Yield and Efficient Circularly Polarized Luminescence

Jian Chen; Xin Pan; Xuanyu Zhang; Chen Sun; Congcong Chen; Xiaoqin Ji; Rui Chen; Lingling Mao

doi:10.1002/smll.202300938

One-Dimensional Chiral Copper Iodide Chain-Like Structure Cu₄ I₄ (R/S-3-quinuclidinol)₃ with Near-Unity Photoluminescence Quantum Yield and Efficient Circularly Polarized Luminescence

Small. 2023 Jun;19(25):e2300938. doi: 10.1002/smll.202300938. Epub 2023 Mar 18.

Authors

Jian Chen¹, Xin Pan¹, Xuanyu Zhang², Chen Sun¹, Congcong Chen¹, Xiaoqin Ji¹, Rui Chen², Lingling Mao¹

Affiliations

¹ Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China.
² Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China.

PMID: 36932944
DOI: 10.1002/smll.202300938

Abstract

Chiral organic-inorganic hybrid metal halide materials have shown great potential for circularly polarized luminescence (CPL) related applications for their tunable structures and efficient emissions. Here, this work combines the highly emissive Cu₄ I₄ cubane cluster with chiral organic ligand R/S-3-quinuclidinol, to construct a new type of 1D Cu-I chains, namely Cu₄ I₄ (R/S-3-quinuclidinol)₃ , crystallizing in noncentrosymmetric monoclinic P2₁ space group. These enantiomorphic hybrids exhibit long-term stability and show bright yellow emission with a photoluminescence quantum yield (PLQY) close to 100%. Due to the successful chirality transfer from the chiral ligands to the inorganic backbone, the enantiomers show intriguing chiroptical properties, such as circular dichroism (CD) and CPL. The CPL dissymmetry factor (g_lum ) is measured to be ≈4 × 10^-3 . Time-resolved photoluminescence (PL) measurements show long averaged decay lifetime up to 10 µs. The structural details within the Cu₄ I₄ reveal the chiral nature of these basic building units, which are significantly different than in the achiral case. This discovery provides new structural insights for the design of high performance CPL materials and their applications in light emitting devices.

Keywords: chirality; chiroptics; circularly polarized luminescence; hybrid copper(I) halides; photoluminescence quantum yield.

Abstract

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