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 language | English |
|---|---|
| Pages (from-to) | 331-336 |
| Number of pages | 6 |
| Journal | Nano Letters |
| Volume | 12 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 11 2012 |
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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 journal › Article
}
TY - JOUR
T1 - 'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials
T2 - Strong influence of shell thickness on light-emitting diode performance
AU - Pal, Bhola N.
AU - Ghosh, Yagnaseni
AU - Brovelli, Sergio
AU - Laocharoensuk, Rawiwan
AU - Klimov, Victor I
AU - Hollingsworth, Jennifer A.
AU - Htoon, Han
PY - 2012/1/11
Y1 - 2012/1/11
N2 - 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.
AB - 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.
KW - Auger recombination
KW - CdSe/CdS
KW - core/shell
KW - energy transfer
KW - Giant nanocrystal quantum dot
KW - QD-LED
UR - http://www.scopus.com/inward/record.url?scp=84855767251&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84855767251&partnerID=8YFLogxK
U2 - 10.1021/nl203620f
DO - 10.1021/nl203620f
M3 - Article
C2 - 22148981
AN - SCOPUS:84855767251
VL - 12
SP - 331
EP - 336
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 1
ER -