Elusive Double Perovskite Iodides: Structural, Optical, and Magnetic Properties

Halide double perovskites [A2MIMIIIX6] are an important class of materials that have garnered substantial interest as non‐toxic alternatives to conventional lead iodide perovskites for optoelectronic applications. While numerous studies have examined chloride and bromide double perovskites, reports...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-08, Vol.62 (32), p.e202306000-n/a
Main Authors: Kent, Greggory T., Morgan, Emily, Albanese, Kaitlin R., Kallistova, Anna, Brumberg, Alexandra, Kautzsch, Linus, Wu, Guang, Vishnoi, Pratap, Seshadri, Ram, Cheetham, Anthony K.
Format: Article
Language:English
Subjects:
Gadolinium
Iodide
Iodides
Lanthanides
Luminescence
Magnetic properties
Magnetism
Optical properties
Optoelectronics
Perovskite Phases
Perovskites
Phase transitions
Photoluminescence
Prediction models
Structural analysis
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Summary:Halide double perovskites [A2MIMIIIX6] are an important class of materials that have garnered substantial interest as non‐toxic alternatives to conventional lead iodide perovskites for optoelectronic applications. While numerous studies have examined chloride and bromide double perovskites, reports of iodide double perovskites are rare, and their definitive structural characterization has not been reported. Predictive models have aided us here in the synthesis and characterization of five iodide double perovskites of general formula Cs2NaLnI6 (Ln=Ce, Nd, Gd, Tb, Dy). The complete crystal structures, structural phase transitions, optical, photoluminescent, and magnetic properties of these compounds are reported. Unicorn double perovskite iodides [A2MIMIIII6] are elusive, but with the help of rational design rules, can indeed be synthesized. The Cs2NaLnI6 (Ln=Ce, Nd, Gd, Tb, Dy) family demonstrate optical properties that are red shifted compared to related halide materials and their magnetic properties show weak interaction parameters.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202306000