Colloidal CdSe1- xSx Nanoplatelets with Narrow and Continuously-Tunable Electroluminescence

Fengjia Fan, Pongsakorn Kanjanaboos, Mayuran Saravanapavanantham, Eric Beauregard, Grayson Ingram, Emre Yassitepe, Michael M. Adachi, Oleksandr Voznyy, Andrew K. Johnston, Grant Walters, Gi Hwan Kim, Zheng Hong Lu, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

106 Scopus citations

Abstract

Colloidal nanoplatelets, quasi-two-dimensional quantum wells, have recently been introduced as colloidal semiconductor materials with the narrowest known photoluminescence line width (∼10 nm). Unfortunately, these materials have not been shown to have continuously tunable emission but rather emit at discrete wavelengths that depend strictly on atomic-layer thickness. Herein, we report a new synthesis approach that overcomes this issue: by alloying CdSe colloidal nanoplatelets with CdS, we finely tune the emission spectrum while still leveraging atomic-scale thickness control. We proceed to demonstrate light-emitting diodes with sub-bandgap turn-on voltages (2.1 V for a device emitting at 2.4 eV) and the narrowest electroluminescence spectrum (FWHM ∼12.5 nm) reported for colloidal semiconductor LEDs.

Original languageEnglish (US)
Pages (from-to)4611-4615
Number of pages5
JournalNano letters
Volume15
Issue number7
DOIs
StatePublished - Jul 8 2015

Keywords

  • alloying
  • CdSeS
  • colloidal nanoplatelets
  • electroluminescence
  • solution-processed light-emitting diodes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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