Stimuli-responsive photoluminescent copper(I) halides for scintillation, anticounterfeiting, and light-emitting diode applications
Dilruba A. Popy , Yashpal Singh , Yauhen Tratsiak , Abby M. Cardoza , John M. Lane , Luis Stand , Mariya Zhuravleva , Neeraj Rai , Bayram Saparov
Aggregate ›› 2024, Vol. 5 ›› Issue (5) : e602
Stimuli-responsive photoluminescent copper(I) halides for scintillation, anticounterfeiting, and light-emitting diode applications
Highly sensitive stimuli-responsive luminescent materials are crucial for applications in optical sensing, security, and anticounterfeiting. Here, we report two zero-dimensional (0D) copper(I) halides, (TEP)2Cu2Br4, (TEP)2Cu4Br6, and 1D (TEP)3Ag6Br9, which are comprised of isolated [Cu2Br4]2−, [Cu4Br6]2−, and [Ag6Br9]3− polyanions, respectively, separated by TEP+ (tetraethylphosphonium [TEP]) cations. (TEP)2Cu2Br4 and (TEP)2Cu4Br6 demonstrate greenish-white and orange-red emissions, respectively, with near unity photoluminescence quantum yields, while (TEP)3Ag6Br9 is a poor light emitter. Optical spectroscopy measurements and density-functional theory calculations reveal that photoemissions of these compounds originate from self-trapped excitons due to the excited-state distortions in the copper(I) halide units. Crystals of Cu(I) halides are radioluminescence active at room temperature under both X- and γ-rays exposure. The light yields up to 15,800 ph/MeV under 662 keV γ-rays of 137Cs suggesting their potential for scintillation applications. Remarkably, (TEP)2Cu2Br4 and (TEP)2Cu4Br6 are interconvertible through chemical stimuli or reverse crystallization. In addition, both compounds demonstrate luminescence on-off switching upon thermal stimuli. The sensitivity of (TEP)2Cu2Br4 and (TEP)2Cu4Br6 to the chemical and thermal stimuli coupled with their ultrabright emission allows their consideration for applications such as solid-state lighting, sensing, information storage, and anticounterfeiting.
0D copper(I) halides / anticounterfeiting / efficient photoluminescence / scintillators / solid-state lighting
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2024 The Author(s). Aggregate published by SCUT, AIEI, and John Wiley & Sons Australia, Ltd.
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