Understanding the Surface Properties of Halide Exchanged Cesium Lead Halide Nanoparticles

Emily Grace Ripka, Christina R. Deschene, John Franck, In Tae Bae, Mathew M Maye

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This report describes a characterization study of the surfaces of CsPbBr3 and CsPbBr3-xIx perovskite nanoparticles (NPs) obtained via a simultaneous purification and halide exchange (HE) postsynthetic processing technique. We studied composition-dependent NP-ligand interactions via diffusion ordered NMR (DOSY) and quantified resulting photoluminescence quantum yield (QY) as a function of halide exchange as well as ligand exchange. Importantly, ligand binding strength and QY were found to decrease when successive purification and/or halide/ligand exchange steps were taken without careful concurrent additions of acid and base ligands. This suggests that ligands added during postsynthetic processing steps are localized at the surface of the NP, passivating open surface sites. Further, we show that CsPbBr3-xIx with increasing CsPbI3 character, obtained via the same method, have decreasing ligand density, from 6.4 to 1.4 to 0.2 nm-2, indicating the composition-dependence of surface ligand binding, which also has consequences on the QY of the resulting mixed-halide NPs. These results shed further light on the importance of ion-ligand moiety additions during purification and halide exchange of highly emissive CsPbBr3 NPs to maintain their as-synthesized properties, as well as the intrinsic differences in surfaces binding and photostability between near-unity QY CsPbBr3 and mixed-halide CsPbBr3-xIx NPs.

Original languageEnglish (US)
Pages (from-to)11139-11146
Number of pages8
JournalLangmuir
Volume34
Issue number37
DOIs
StatePublished - Sep 18 2018

Fingerprint

cesium halides
Cesium
surface properties
halides
Surface properties
Lead
Ligands
Nanoparticles
nanoparticles
ligands
Quantum yield
purification
Purification
Ion exchange
Processing
Chemical analysis
Perovskite
unity
Photoluminescence
Nuclear magnetic resonance

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Understanding the Surface Properties of Halide Exchanged Cesium Lead Halide Nanoparticles. / Ripka, Emily Grace; Deschene, Christina R.; Franck, John; Bae, In Tae; Maye, Mathew M.

In: Langmuir, Vol. 34, No. 37, 18.09.2018, p. 11139-11146.

Research output: Contribution to journalArticle

Ripka, Emily Grace ; Deschene, Christina R. ; Franck, John ; Bae, In Tae ; Maye, Mathew M. / Understanding the Surface Properties of Halide Exchanged Cesium Lead Halide Nanoparticles. In: Langmuir. 2018 ; Vol. 34, No. 37. pp. 11139-11146.
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