Complete Dopant Substitution by Spinodal Decomposition in Mn-Doped Two-Dimensional CsPbCl3 Nanoplatelets

Zhi Jun Li, Elan Hofman, Andrew Hunter Davis, Alex Khammang, Joshua T. Wright, Boris Dzikovski, Robert W. Meulenberg, Weiwei Zheng

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

The introduction of dopants plays a key role in the physical properties of semiconductors for optoelectronic applications. However, doping is generally challenging for nanocrystals (NCs), especially for two-dimensional (2D) NCs, due to the self-annealing effect and high surface energies required for dopant addition. Here, we report an efficient doping strategy for Mn-doped 2D CsPbCl3 (i.e., Mn:CsPbCl3) nanoplatelets (NPLs) through a postsynthetic solvothermal process. While the original lightly doped 2D Mn:CsPbCl3 NPLs were obtained from growth doping, higher Mn doping efficiencies were achieved through diffusion doping under pressure-mediated solvothermal conditions, resulting in enhanced Mn photoluminescence (PL). Surprisingly, a new CsMnCl3 phase with complete dopant substitution by spinodal decomposition was observed with extended solvothermal treatment, which is confirmed by powder X-ray diffraction, X-ray absorption fine structure, and electron paramagnetic resonance. Compared with Mn:CsPbCl3 NPLs, the pure CsMnCl3 NPLs give rise to shorter Mn PL lifetime, which is consistent with the short Mn-Mn distance within CsMnCl3 NPLs. This work provides an efficient strategy for doping inside NCs as well as new insights on the dopant concentration-dependent structural and optical properties of perovskite NCs.

Original languageEnglish (US)
Pages (from-to)6400-6409
Number of pages10
JournalChemistry of Materials
Volume30
Issue number18
DOIs
StatePublished - Sep 25 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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    Li, Z. J., Hofman, E., Davis, A. H., Khammang, A., Wright, J. T., Dzikovski, B., Meulenberg, R. W., & Zheng, W. (2018). Complete Dopant Substitution by Spinodal Decomposition in Mn-Doped Two-Dimensional CsPbCl3 Nanoplatelets. Chemistry of Materials, 30(18), 6400-6409. https://doi.org/10.1021/acs.chemmater.8b02657