Ultrasmall CsPbBr₃ Blue Emissive Perovskite Quantum Dots Using K-Alloyed Cs₄PbBr₆ Nanocrystals as Precursors

Clara Otero-Martínez; Matteo L. Zaffalon; Yurii P. Ivanov; Nikolaos Livakas; Luca Goldoni; Giorgio Divitini; Sankalpa Bora; Gabriele Saleh; Francesco Meinardi; Andrea Fratelli; Sudip Chakraborty; Lakshminarayana Polavarapu; Sergio Brovelli; Liberato Manna

doi:10.1021/acsenergylett.4c00693

journal article·2024-05-10Open access

Ultrasmall CsPbBr₃ Blue Emissive Perovskite Quantum Dots Using K-Alloyed Cs₄PbBr₆ Nanocrystals as Precursors

Clara Otero-Martínez, Matteo L. Zaffalon, Yurii P. Ivanov, Nikolaos Livakas, Luca Goldoni, Giorgio Divitini, Sankalpa Bora, Gabriele Saleh, Francesco Meinardi, Andrea Fratelli, Sudip Chakraborty, Lakshminarayana Polavarapu, Sergio Brovelli, Liberato Manna

ACS Energy Letters· Volume 9· Issue 5

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Source abstract

Abstract

We report a colloidal synthesis of blue emissive, stable cube-shaped CsPbBr 3 quantum dots (QDs) in the strong quantum confinement regime via dissolution–recrystallization starting from pre-syntesized (K x Cs 1– x ) 4 PbBr 6 nanocrystals which are then reacted with PbBr 2 . This is markedly different from the known case of Cs 4 PbBr 6 nanocrystals that react within seconds with PbBr 2 and get transformed into much larger, green emitting CsPbBr 3 nanocrystals. Here, instead, the conversion of (K x Cs 1– x ) 4 PbBr 6 nanocrystals to CsPbBr 3 QDs occurs in a time span of hours, and tuning of the QD size is achieved by adjusting the concentration of the precursors. The QDs exhibit excitonic features in optical absorption that are tunable in the 420–452 nm range, accompanied by blue photoluminescence with quantum yield around 60%. Detailed spectroscopic investigations in both the single and multiexciton regime reveal the exciton fine structure and the effect of Auger recombination of these CsPbBr 3 QDs, confirming theoretical predictions for this system.

Source: openalex_inverted_index · Quality: baseline

Research context

Metals & alloys Nanomaterials Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · 2D Materials and Applications

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

Affiliations

CINBIO, Department of Physical Chemistry, Materials Chemistry and Physics Group, Universidade de Vigo, Campus Universitario As Lagoas-Marcosende, 36310 Vigo, Spain

Nanochemistry, Istituto Italiano di Tecnología, Via Morego 30, 16163 Genova, Italy

Dipartimento di Scienza dei Materiali, Università degli Studi di Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy

Electron Microscopy and Nanoscopy, Istituto Italiano di Tecnología, Via Morego 30, 16163 Genova, Italy

Dipartimento di Chimica e Chimica Industriale, Università di Genova, 16146 Genova, Italy

Material Characterization Facility, Istituto Italiano di Tecnologia Via Morego 30, 16163 Genova, Italy

Materials Theory for Energy Scavenging (MATES) Lab, Department of Physics, Harish-Chandra Research Institute (HRI), A C.I. of Homi Bhabha National Institute (HBNI), Jhunsi, Prayagraj 211019, India

Funding

HORIZON EUROPE European Innovation Council · Agencia Estatal de Investigaci?n · Ministerio de Ciencia e Innovaci?n · Xunta de Galicia · Ministero dell'Istruzione, dell'Universit? e della Ricerca · Ministero dell'Ambiente e della Sicurezza Energetica

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