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 journalArticle

Abstract

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
Volume31
Issue number14
DOIs
Publication statusPublished - Jul 23 2019

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Semiconductor doping
Selenium compounds
Infrared devices
Selenium Compounds
Fluorescence spectroscopy
Polymethyl Methacrylate
Sols
Mercury
Particle size analysis
Photoluminescence
Energy gap
Anisotropy
X ray photoelectron spectroscopy
Optical properties
Fluorescence
Doping (additives)
Mercury (metal)
Selenium
Cadmium
Linewidth

ASJC Scopus subject areas

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

Cite this

Galle, T., Kazes, M., Hübner, R., Lox, J., Samadi Khoshkhoo, M., Sonntag, L., ... Eychmüller, A. (2019). Colloidal Mercury-Doped CdSe Nanoplatelets with Dual Fluorescence. Chemistry of Materials, 31(14), 5065-5074. https://doi.org/10.1021/acs.chemmater.9b00812

Colloidal Mercury-Doped CdSe Nanoplatelets with Dual Fluorescence. / Galle, Tom; Kazes, Miri; Hübner, René; Lox, Josephine; Samadi Khoshkhoo, Mahdi; Sonntag, Luisa; Tietze, Remo; Sayevich, Vladimir; Oron, Dan; Koitzsch, Andreas; Lesnyak, Vladimir; Eychmüller, Alexander.

In: Chemistry of Materials, Vol. 31, No. 14, 23.07.2019, p. 5065-5074.

Research output: Contribution to journalArticle

Galle, T, Kazes, M, Hübner, R, Lox, J, Samadi Khoshkhoo, M, Sonntag, L, Tietze, R, Sayevich, V, Oron, D, Koitzsch, A, Lesnyak, V & Eychmüller, A 2019, 'Colloidal Mercury-Doped CdSe Nanoplatelets with Dual Fluorescence', Chemistry of Materials, vol. 31, no. 14, pp. 5065-5074. https://doi.org/10.1021/acs.chemmater.9b00812
Galle T, Kazes M, Hübner R, Lox J, Samadi Khoshkhoo M, Sonntag L et al. Colloidal Mercury-Doped CdSe Nanoplatelets with Dual Fluorescence. Chemistry of Materials. 2019 Jul 23;31(14):5065-5074. https://doi.org/10.1021/acs.chemmater.9b00812
Galle, Tom ; Kazes, Miri ; Hübner, René ; Lox, Josephine ; Samadi Khoshkhoo, Mahdi ; Sonntag, Luisa ; Tietze, Remo ; Sayevich, Vladimir ; Oron, Dan ; Koitzsch, Andreas ; Lesnyak, Vladimir ; Eychmüller, Alexander. / Colloidal Mercury-Doped CdSe Nanoplatelets with Dual Fluorescence. In: Chemistry of Materials. 2019 ; Vol. 31, No. 14. pp. 5065-5074.
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