Highly Effective Hybrid Copper(I) Iodide Cluster Emitter with Negative Thermal Quenched Phosphorescence for X-Ray Imaging

Qingsong Hu; Chengkai Zhang; Xian Wu; Guijie Liang; Lei Wang; Xiaowei Niu; Zhi Wang; Wei-Dan Si; Yibo Han; Ruiqin Huang; Jiawen Xiao; Di Sun

doi:10.1002/anie.202217784

Highly Effective Hybrid Copper(I) Iodide Cluster Emitter with Negative Thermal Quenched Phosphorescence for X-Ray Imaging

Angew Chem Int Ed Engl. 2023 Mar 6;62(11):e202217784. doi: 10.1002/anie.202217784. Epub 2023 Feb 1.

Authors

Qingsong Hu^{1

2}, Chengkai Zhang³, Xian Wu^{1

2}, Guijie Liang^{1

2}, Lei Wang^{1

2}, Xiaowei Niu⁴, Zhi Wang³, Wei-Dan Si³, Yibo Han⁵, Ruiqin Huang⁵, Jiawen Xiao⁴, Di Sun³

Affiliations

¹ Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang, 441053, China.
² Hubei Longzhong Laboratory, Xiangyang, 441000, Hubei, China.
³ School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Ji'nan, 250100, P. R. China.
⁴ Beijing Key Lab of Microstructure and Property of Advanced Materials, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, China.
⁵ Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China.

PMID: 36647290
DOI: 10.1002/anie.202217784

Abstract

The low efficiency triplet emission of hybrid copper(I) iodide clusters is a critical obstacle to their further practical optoelectronic application. Herein, we present an efficient hybrid copper(I) iodide cluster emitter (DBA)₄ Cu₄ I₄ , where the cooperation of excited state structure reorganization and the metallophilicity interaction enables ultra-bright triplet yellow-orange emission with a photoluminescence quantum yield over 94.9 %, and the phonon-assisted de-trapping process of exciton induces the negative thermal quenching effect at 80-300 K. We also investigate the potential of this emitter for X-ray imaging. The (DBA)₄ Cu₄ I₄ wafer demonstrates a light yield higher than 10⁴ photons MeV^-1 and a high spatial resolution of ≈5.0 lp mm^-1 , showing great potential in practical X-ray imaging applications. Our new copper(I) iodide cluster emitter can serve as a model for investigating the thermodynamic mechanism of photoluminescence in hybrid copper(I) halide phosphorescence materials.

Keywords: Copper(I) Cluster; Efficient Triplet Phosphorescence; Negative Thermal Quenching; X-Ray Imaging.