Stabilized Multicolor CsPbBr <sub> 3– <i>x</i> </sub> I <sub> <i>x</i> </sub> Nanocrystals via Ca–I Scorpionate Capping for Down-Light Converters

Anion exchange has been recognized as one of the most effective approaches for mediating the spontaneous formation of mixed-halide perovskite nanocrystals (MHPs) with tunable optical properties and color quality. However, the difference in the diffusion capability of halides, specifically between bromide and iodide species, into MHPs makes these materials prone to halide deficiency, which deteriorates their structural integrity and stability. In this work, we studied the surface passivation and composition engineering by introducing a dinuclear calcium-iodide scorpionate complex (CaISC) dispersed into different organic solvents such as chloroform, dichloromethane, 1,2-dichloroethane, and acetonitrile, which favor or hinder the I-for-Br exchange process between this ligand and native CsPbBr3 perovskite nanocrystals (PNCs). By analyzing the CaISC content and the nature of the solvent, we are able to efficiently promote halide exchange, also generating an intermediate mononuclear Ca2+ complex, favoring Ca2+ doping and the diffusion of a high density of iodide species for triggering Pb2+ and halide defect compensation. From this strategy, suitable CaISC-capped CsPbBr3–xIx PNCs active layers were prepared for the fabrication of efficient down-light converters, with operational stability up to 480 h. This contribution offers an alternative for the processing of stable multicolor PNCs with facile modulation of their photophysical properties, making them adequate for the fabrication of future LED technologies.

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Publication Details

Journal
ACS Applied Optical Materials
Published
2026-04-14
DOI
https://doi.org/10.1021/acsaom.6c00102
Primary Topic
Perovskite Materials and Applications
Type
article
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0.00

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article

Stabilized Multicolor CsPbBr 3– x I x Nanocrystals via Ca–I Scorpionate Capping for Down-Light Converters

Jhonatan Rodríguez‐Pereira, Oscar A. Douglas‐Gallardo, Felipe de la Cruz‐Martínez, Iván Mora‐Seró et al.
ACS Applied Optical Materials
Perovskite Materials and Applications
article

Stabilized Multicolor CsPbBr 3– x I x Nanocrystals via Ca–I Scorpionate Capping for Down-Light Converters

Jhonatan Rodríguez‐Pereira, Oscar A. Douglas‐Gallardo, Felipe de la Cruz‐Martínez, Iván Mora‐Seró, Camilo Segura, Beatriz Julián‐López, Carina Pareja‐Rivera, Francisca Werlinger, Agustín Lara‐Sánchez, Andrés F. Gualdrón‐Reyes, Seog Joon Yoon, Enrique Francés‐Poveda, Víctor Mayorga, Javier Martínez, Juwon Jang, Harumi Correa‐Leiva, Ignacio Utreras-Asenjo, Bárbara Nicoleth Vallejos
article en

Abstract

Anion exchange has been recognized as one of the most effective approaches for mediating the spontaneous formation of mixed-halide perovskite nanocrystals (MHPs) with tunable optical properties and color quality. However, the difference in the diffusion capability of halides, specifically between bromide and iodide species, into MHPs makes these materials prone to halide deficiency, which deteriorates their structural integrity and stability. In this work, we studied the surface passivation and composition engineering by introducing a dinuclear calcium-iodide scorpionate complex (CaISC) dispersed into different organic solvents such as chloroform, dichloromethane, 1,2-dichloroethane, and acetonitrile, which favor or hinder the I-for-Br exchange process between this ligand and native CsPbBr3 perovskite nanocrystals (PNCs). By analyzing the CaISC content and the nature of the solvent, we are able to efficiently promote halide exchange, also generating an intermediate mononuclear Ca2+ complex, favoring Ca2+ doping and the diffusion of a high density of iodide species for triggering Pb2+ and halide defect compensation. From this strategy, suitable CaISC-capped CsPbBr3–xIx PNCs active layers were prepared for the fabrication of efficient down-light converters, with operational stability up to 480 h. This contribution offers an alternative for the processing of stable multicolor PNCs with facile modulation of their photophysical properties, making them adequate for the fabrication of future LED technologies.

ACS Applied Optical Materials
Universitat Jaume I (ES), Central European Institute of Technology (CZ), University of Pardubice (CZ), Austral University of Chile (CL), University of Concepción (CL), University of Bío-Bío (CL), Parc Científic de la Universitat de València (ES), Instituto de Química Orgánica General (ES), Yeungnam University (KR), Brno University of Technology (CZ), University of Chile (CL), University of Castilla-La Mancha (ES)
Ministerstvo Školství, Mládeže a Tělovýchovy, Generalitat Valenciana, National Research Foundation of Korea, Universitat Jaume I, Universidad de Castilla-La Mancha, Universidad Austral de Chile, Junta de Comunidades de Castilla-La Mancha, European Regional Development Fund, Agencia Estatal de Investigación, Fondo Nacional de Desarrollo Científico y Tecnológico
Openalex Percentile: Top 18%
Perovskite Materials and Applications
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