'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials: Strong influence of shell thickness on light-emitting diode performance

Bhola N. Pal, Yagnaseni Ghosh, Sergio Brovelli, Rawiwan Laocharoensuk, Victor I Klimov, Jennifer A. Hollingsworth, Han Htoon

Research output: Contribution to journalArticle

236 Citations (Scopus)

Abstract

We use a simple device architecture based on a poly(3,4- ethylendioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)-coated indium tin oxide anode and a LiF/Al cathode to assess the effects of shell thickness on the properties of light-emitting diodes (LEDs) comprising CdSe/CdS core/shell nanocrystal quantum dots (NQDs) as the emitting layer. Specifically, we are interested in determining whether LEDs based on thick-shell nanocrystals, so-called "giant" NQDs, afford enhanced performance compared to their counterparts incorporating thin-shell systems. We observe significant improvements in device performance as a function of increasing shell thickness. While the turn-on voltage remains approximately constant for all shell thicknesses (from 4 to 16 CdS monolayers), external quantum efficiency and maximum luminance are found to be about one order of magnitude higher for thicker shell nanocrystals (≥13 CdS monolayers) compared to thinner shell structures (2, respectively, with a remarkably low turn-on voltage of ∼3.0 V.

Original languageEnglish
Pages (from-to)331-336
Number of pages6
JournalNano Letters
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 11 2012

Fingerprint

Nanocrystals
Semiconductor quantum dots
Light emitting diodes
nanocrystals
light emitting diodes
quantum dots
Monolayers
Electric potential
electric potential
luminance
Tin oxides
Quantum efficiency
indium oxides
Indium
tin oxides
quantum efficiency
Luminance
Anodes
Cathodes
anodes

Keywords

  • Auger recombination
  • CdSe/CdS
  • core/shell
  • energy transfer
  • Giant nanocrystal quantum dot
  • QD-LED

ASJC Scopus subject areas

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

Cite this

'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials : Strong influence of shell thickness on light-emitting diode performance. / Pal, Bhola N.; Ghosh, Yagnaseni; Brovelli, Sergio; Laocharoensuk, Rawiwan; Klimov, Victor I; Hollingsworth, Jennifer A.; Htoon, Han.

In: Nano Letters, Vol. 12, No. 1, 11.01.2012, p. 331-336.

Research output: Contribution to journalArticle

Pal, Bhola N. ; Ghosh, Yagnaseni ; Brovelli, Sergio ; Laocharoensuk, Rawiwan ; Klimov, Victor I ; Hollingsworth, Jennifer A. ; Htoon, Han. / 'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials : Strong influence of shell thickness on light-emitting diode performance. In: Nano Letters. 2012 ; Vol. 12, No. 1. pp. 331-336.
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