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journal article·2024-10Open access

Lattice Engineering via Transition Metal Ions for Boosting Photoluminescence Quantum Yields of Lead‐Free Layered Double Perovskite Nanocrystals

Maning Liu, Sri Kasi Matta, Tarek Al Said, Jiatu Liu, Anastasia Matuhina, Basheer Al‐Anesi, Harri Ali‐Löytty, Kimmo Lahtonen, Slavy P. Russo, Paola Vivo

Small· Volume 20· Issue 40
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Abstract

Abstract Lead‐free layered double perovskite nanocrystals (NCs), i.e., Cs 4 M(II)M(III) 2 Cl 12 , have recently attracted increasing attention for potential optoelectronic applications due to their low toxicity, direct bandgap nature, and high structural stability. However, the low photoluminescence quantum yield (PLQY, <1%) or even no observed emissions at room temperature have severely blocked the further development of this type of lead‐free halide perovskites. Herein, two new layered perovskites, Cs 4 CoIn 2 Cl 12 (CCoI) and Cs 4 ZnIn 2 Cl 12 (CZnI), are successfully synthesized at the nanoscale based on previously reported Cs 4 CuIn 2 Cl 12 (CCuI) NCs, by tuning the M(II) site with different transition metal ions for lattice tailoring. Benefiting from the formation of more self‐trapped excitons (STEs) in the distorted lattices, CCoI and CZnI NCs exhibit significantly strengthened STE emissions toward white light compared to the case of almost non‐emissive CCuI NCs, by achieving PLQYs of 4.3% and 11.4% respectively. The theoretical and experimental results hint that CCoI and CZnI NCs possess much lower lattice deformation energies than that of reference CCuI NCs, which are favorable for the recombination of as‐formed STEs in a radiative way. This work proposes an effective strategy of lattice engineering to boost the photoluminescent properties of lead‐free layered double perovskites for their future warm white light‐emitting applications.
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Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Centre for Analysis and Synthesis Department of Chemistry Lund University P.O. Box 124 Lund 22100 Sweden

Wallenberg Initiative Materials Science for Sustainability Department of Chemistry Lund University Lund 22100 Sweden

NanoLund Lund University Lund 22100 Sweden

Hybrid Solar Cells Faculty of Engineering and Natural Sciences Tampere University P.O. Box 541 Tampere FI‐33014 Finland

JSPS International Research Fellow (Center for Computational Sciences) University of Tsukuba Tsukuba 305‐8577 Japan

Australian Research Council (ARC) Centre of Excellence for Exciton Science RMIT University Melbourne 3000 Australia

Department Spins in Energy Conversion and Quantum Information Science Helmholtz‐Zentrum Berlin für Materialien und Energie GmbH Albert‐Einstein‐Str. 16 12489 Berlin Germany

MAX IV Laboratory Fotongatan 2 Lund 224 84 Sweden

Surface Science Group Faculty of Engineering and Natural Sciences Tampere University P.O. Box 692 Tampere FI‐33014 Finland

Faculty of Engineering and Natural Sciences Tampere University P.O. Box 692 Tampere FI‐33014 Finland

Theoretical Condensed Matter Physics Laboratory Australian Research Council (ARC) Centre of Excellence for Exciton Science RMIT University Melbourne 3000 Australia

Funding

Jane ja Aatos Erkon Säätiö · Centre of Excellence in Exciton Science · Japan Society for the Promotion of Science London · Suomen Kulttuurirahasto · Knut och Alice Wallenbergs Stiftelse · Kungliga Fysiografiska Sällskapet i Lund

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