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Updated: Jul 17, 2026

Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Afterglow Copper(I) Iodine Cluster Scintillator
Ying-Nan Zhao1, Qi Yang1, Bo-Han Yao1
1Tianjian Laboratory of Advanced Biomedical Sciences, Henan Key Laboratory of Crystalline Molecular Functional Materials, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
Abstract:
Copper(I) iodine clusters have drawn intense attention due to their advantageous photophysical properties, such as a high luminescence efficiency, large Stokes shift, and tunable luminescence lifetimes. In this work, a copper(I) iodine cluster (Cu2I2-CH3CN) was synthesized, which exhibits unique afterglow emission, ultrahigh quantum yield (90.1 % in solid state) and aggregation-induced emission (AIE) behavior. It was found that thermally activated delayed fluorescence (TADF) and long-lifetime phosphorescence occur simultaneously in Cu2I2-CH3CN. The unique photoluminescence properties of Cu2I2-CH3CN were attributed to the large spin-orbit coupling (SOC) and long-term rigidity of the crystal. The high quantum efficiency, TADF characteristics, and heavy-atom composition of Cu2I2-CH3CN endow it with excellent X-ray excited luminescence (XEL) properties, making it a promising X-ray scintillator. A flexible scintillator screen made of Cu2I2-CH3CN was successfully fabricated and used for X-ray imaging with a spatial resolution of 23.6 LP mm-1.
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