Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange

Benjamin T. Diroll, Richard D. Schaller

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Treatment of CdSe nanoplatelets with halide salts induces a bathochromic shift in the absorption resonances that does not occur in quasi-spherical quantum dots of the same composition. The optical shifts are not strongly sensitive to the cation moiety, which may be organic or inorganic. The magnitude of the energy shift is largest for thinner nanoplatelets, with bathochromic shifts as large as 240 meV observed for 3 monolayer nanoplatelets. This effect is driven by a tetragonal distortion of the zinc blende lattice in response to ligand exchange. The expansion of the lattice in the shortest nanoplatelet axis results in the observed red-shifts due primarily to relaxation of quantum confinement, with secondary contributions from strain.

Original languageEnglish
Pages (from-to)3556-3563
Number of pages8
JournalChemistry of Materials
Volume31
Issue number9
DOIs
Publication statusPublished - May 14 2019

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ASJC Scopus subject areas

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

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