Colloidal Mercury-Doped CdSe Nanoplatelets with Dual Fluorescence

Tom Galle, Miri Kazes, René Hübner, Josephine Lox, Mahdi Samadi Khoshkhoo, Luisa Sonntag, Remo Tietze, Vladimir Sayevich, Dan Oron, Andreas Koitzsch, Vladimir Lesnyak, Alexander Eychmüller

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Quasi-two-dimensional (2D) CdSe nanoplatelets (NPLs) are distinguished by their unique optical properties in comparison to classical semiconductor nanocrystals, such as extremely narrow emission line widths, reduced Auger recombination, and relatively high absorption cross sections. Inherent to their anisotropic 2D structure, however, is the loss of continuous tunability of their photoluminescence (PL) properties due to stepwise growth. On top of that, limited experimental availability of NPLs of different thicknesses and ultimately the bulk band gap of CdSe constrain the achievable PL wavelengths. Here, we report on the doping of CdSe NPLs with mercury, which gives rise to additional PL in the red region of the visible spectrum and in the near-infrared region. We employ a seeded-growth method with injection solutions containing cadmium, selenium, and mercury. The resulting NPLs retain their anisotropic structure, are uniform in size and shape, and present significantly altered spectroscopic characteristics due to the existence of additional energetic states. We conclude that doping takes place by employing elemental analysis in combination with PL excitation spectroscopy, X-ray photoelectron spectroscopy, and single-particle fluorescence spectroscopy, confirming single emitters being responsible for multiple distinct emission signals.

Original languageEnglish
Pages (from-to)5065-5074
Number of pages10
JournalChemistry of Materials
Issue number14
Publication statusPublished - Jul 23 2019

ASJC Scopus subject areas

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

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