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Hybrid organic-inorganic perovskites constitute a rapidly-growing family of solid-state semiconducting materials with remarkable potential in optoelectronic and photovoltaic applications. Their highly-tunable chemical composition enables emission across a broad spectral range; however, efficient violet-blue emitting perovskites remain relatively scarce. In this work, we present the synthesis, structural characterization, and optical properties of a new two-dimensional (2D) hybrid perovskite, (ethylammonium)2CdBr4. The crystal structure of this compound comprises infinite inorganic 2D layers formed by corner-sharing [CdBr6]4− octahedra, separated by ethylammonium cations. Optical absorption measurements indicate a wide band gap of 4.25 eV. Photoluminescence studies reveal a sharp emission peak centered at 388 nm with a full-width at half maximum (FWHM) of 32 nm, corresponding to chromaticity coordinates that closely approach the NTSC blue standard. Density functional theory (DFT) calculations of the electronic band structure and density of states (DOS) confirm that the states near the Fermi level are primarily derived from cadmium and bromine orbitals. The combined experimental and theoretical results demonstrate that (ethylammonium)2CdBr4 represents a promising candidate for violet-blue light emission, offering a simple, cost-effective route toward next-generation perovskite-based luminophores utilizing readily available organic cations. This study contributes to the ongoing exploration of low-dimensional perovskites as tunable emitters for advanced optoelectronic technologies.
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