Proceedings of Online Meetup - Beyond Lead Halide Perovskites: Syntheses and Applications of Metal Halide Semiconductors (MABP)
Publication date: 23rd April 2020
Nontoxic alternatives to lead halide perovskites are highly sought after for applications in optoelectronics. Blue-luminescent materials are especially demanded as they could be used to prepare white light-emitting diodes, with important potential applications in lighting systems. However, wide band gap blue emitters with high photoluminescence quantum yields (PLQYs) are typically more difficult to obtain as compared to green- or red-emitting ones. Here, we prepared a series of inorganic cesium copper halides, with the general formula Cs3Cu2X5 (X = Cl, Br, I, and mixtures thereof) by dry mechanochemical synthesis at room temperature. X-ray diffraction demonstrates quantitative conversion of binary precursors into the desired ternary structures and good halide mixing in single-phase compounds. We identified Cs3Cu2I5 as the most promising material as it maintains blue luminescence centered at 442 nm with a high PLQY (>40%) after several days in air (Cs3Cu2Cl5 shows significantly higher PLQY, over 80% but is unstable in air). Based on this, we fabricated homogeneous and pinhole-free Cs3Cu2I5 thin films by thermal single-source vacuum deposition. Crystalline phase and photoluminescence features are maintained in the thin films, demonstrating that these low-toxicity materials can be synthesized and processed by fully solvent-free routes for a widespread implementation in optoelectronic devices.
The research leading to these results has received funding from the European Union Programme for Research and Innovation Horizon 2020 (2014-2020) under the Marie Skłodowska-Curie Grant Agreement PerovSAMs No. 747599, from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. [834431]), the Spanish Ministry of Science, Innovation and Universities (ex-MINECO) via the Unidad de Excelencia Marı ́a de Maeztu MDM-2015-0538, MAT2017- 88821-R, and PCIN-2015-255, and the Generalitat Valenciana (Prometeo/2016/135). P.S thanks the Spanish Ministry of Education, Culture and Sport for her pre-doctoral grant. M.S. thanks the Spanish Ministry of Science Innovation and Universities (ex-MINECO) for his postdoctoral RyC contract. We acknowledge the European Union’s Horizon 2020 research & innovation program under grant agreement No. 763977 of the PerTPV project.
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