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Updated: May 11, 2026

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Luminescent Properties and Thermal Stability of [PPh4][Cu3I4] with a Unique Helical Structure
Luyi Chen1, Andrey A Petrov1,2, Mingming Li1
1Department of Materials Science, Shenzhen MSU-BIT University, Shenzhen 518172, China.
Abstract:
Hybrid halocuprates (I) with organic cations show great potential for optoelectronic applications due to their tunable luminescence and high thermal stability. In this study, the iodocuprate (I) [PPh4][Cu3I4], featuring unique helical chains of face-sharing tetrahedra, was synthesized and characterized. This compound exhibits a bandgap of 3.1 eV and orange luminescence at low temperature, attributed to self-trapped exciton emission. [PPh4][Cu3I4] demonstrates exceptional thermal stability among hybrid halocuprates with decomposition above 380 °C, forming a stable melt at ~255 °C without Cu+ oxidation in ambient atmosphere.
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