Room temperature doping of Ln3+ in perovskite nanoparticles: a halide exchange mediated cation exchange approach

Gouranga H. Debnath; Brian P. Bloom; Susheng Tan; David H. Waldeck

doi:10.1039/D2NR00490A

Room temperature doping of Ln³⁺ in perovskite nanoparticles: a halide exchange mediated cation exchange approach†

Gouranga H. Debnath,

^a Brian P. Bloom,

^a Susheng Tan

^bc and David H. Waldeck

*^ac

Author affiliations

* Corresponding authors

^a Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
E-mail: dave@pitt.edu

^b Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA

^c Petersen Institute of NanoScience and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA

Abstract

This study presents a halide exchange mediated cation exchange strategy for a room temperature doping of trivalent lanthanide cations (Ln³⁺) in cesium lead halide (CsPbX₃) nanoparticles (NPs). Post-synthetic addition of LnCl₃ [Ln = Nd, Sm, Eu, Tb, Dy, and Yb] to a solution of CsPbBr₃ NPs generates the corresponding lanthanide doped NPs which display host sensitized Ln³⁺ emission. Structural and spectroscopic characterizations indicate a successful halide exchange and substitutional displacement of Pb²⁺ by Ln³⁺. The effect of halide identity in controlling the Ln³⁺ sensitization was also evaluated. A photophysical framework is presented that can be used to predict the Ln³⁺ sensitization in perovskite NPs semiempirically, thereby removing the constraints of trial and error in designing a perovskite NP-Ln³⁺ host–guest combination.

This article is part of the themed collection: 2022 Nanoscale HOT Article Collection

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Article information

DOI: https://doi.org/10.1039/D2NR00490A
Article type: Paper
Submitted: 25 1 2022
Accepted: 31 3 2022
First published: 31 3 2022

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Nanoscale, 2022,14, 6037-6051

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Room temperature doping of Ln³⁺ in perovskite nanoparticles: a halide exchange mediated cation exchange approach

G. H. Debnath, B. P. Bloom, S. Tan and D. H. Waldeck, Nanoscale, 2022, 14, 6037 DOI: 10.1039/D2NR00490A

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