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Solvent-Free Synthesis and Thin-Film Deposition of Cesium Copper Halides with Bright Blue Photoluminescence

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Solvent-Free Synthesis and Thin-Film Deposition of Cesium Copper Halides with Bright Blue Photoluminescence

dc.contributor.author	Sebastia-Luna, Paz
dc.contributor.author	Navarro-Alapont, Javier
dc.contributor.author	Sessolo, Michele
dc.contributor.author	Palazón Huet, Francisco
dc.contributor.author	Bolink, Henk
dc.date.accessioned	2020-02-19T14:18:31Z
dc.date.available	2020-11-21T05:45:04Z
dc.date.issued	2019
dc.identifier.uri	https://hdl.handle.net/10550/73154
dc.description.abstract	Non-toxic 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 bandgap blue emitters with high photoluminescence quantum yields (PLQY) are typically more difficult to obtain as compared to green- or red-emitting ones. Here, we prepared two series of inorganic cesium copper halides, with the general formulas Cs3Cu2X5 and CsCu2X3 (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 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 are maintained in the thin films, validating that these low-toxicity materials can be synthesized and processed by fully solvent-free routes for a widespread implementation in optoelectronic devices.
dc.language.iso	eng
dc.relation.ispartof	Chemistry of Materials, 2019, vol. 31, p. 10205-10210
dc.rights.uri	info:eu-repo/semantics/openAccess
dc.source	Sebastia-Luna, Paz Navarro-Alapont, Javier Sessolo, Michele Palazón Huet, Francisco Bolink, Henk 2019 Solvent-Free Synthesis and Thin-Film Deposition of Cesium Copper Halides with Bright Blue Photoluminescence Chemistry of Materials 31 10205 10210
dc.subject	Materials
dc.title	Solvent-Free Synthesis and Thin-Film Deposition of Cesium Copper Halides with Bright Blue Photoluminescence
dc.type	info:eu-repo/semantics/article
dc.date.updated	2020-02-19T14:18:31Z
dc.identifier.doi	https://doi.org/10.1021/acs.chemmater.9b03898
dc.identifier.idgrec	135964
dc.embargo.terms	1 year