Publication date: 17th July 2025
Owing to the outstanding optoelectronical properties of hybrid lead halide perovskites, such as intense photoluminescence and adjustable band gap, this family of materials attracts a lot of attention. However, because of the lead toxicity, discovering new lead-free perovskites is urgent.
Through exploratory syntheses, we discovered new hybrid alkali halide perovskites （PiPH2)3CsI7·xH2O(PiP=Piperazine, C4N2H10). These materials were prepared by simple synthesis methods based on abundant resources and exhibit a broad emission suitable for the fabrication of pc-WLED.
To unravel the origin of this emission, we employed temperature-dependent emission–excitation mapping together with power-dependent PL measurements. These analyses revealed that the light output arises from defect-related states, most likely tied to iodine excess within the lattice. This observation highlights defect control as a powerful handle for tailoring the emission behavior of such compounds. More importantly, our findings illustrate that hybrid alkali halide perovskites, though largely neglected so far, could offer an attractive route to environmentally benign, structurally robust, and cost-effective luminescent materials—promising candidates for future optoelectronic technologies without the toxicity concerns of traditional lead-based systems.
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