'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
1
,
Yagnaseni Ghosh
1
,
Sergio Brovelli
1
,
Rawiwan Laocharoensuk
1
,
Victor I. Klimov
1
,
Jennifer A. Hollingsworth
1
,
Han Htoon
1
Publication type: Journal Article
Publication date: 2011-12-22
scimago Q1
wos Q1
SJR: 2.967
CiteScore: 14.9
Impact factor: 9.1
ISSN: 15306984, 15306992
PubMed ID:
22148981
General Chemistry
Condensed Matter Physics
General Materials Science
Mechanical Engineering
Bioengineering
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 (<9 CdS monolayers). The thickest-shell nanocrystals (16 monolayers of CdS) afforded an external quantum efficiency and luminance of 0.17% and 2000 Cd/m(2), respectively, with a remarkably low turn-on voltage of ~3.0 V.
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Pal B. N. et al. 'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials: strong influence of shell thickness on light-emitting diode performance. // Nano Letters. 2011. Vol. 12. No. 1. pp. 331-336.
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Pal B. N., Ghosh Y., Brovelli S., Laocharoensuk R., Klimov V. I., Hollingsworth J. A., Htoon H. 'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials: strong influence of shell thickness on light-emitting diode performance. // Nano Letters. 2011. Vol. 12. No. 1. pp. 331-336.
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TY - JOUR
DO - 10.1021/nl203620f
UR - https://doi.org/10.1021/nl203620f
TI - 'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials: strong influence of shell thickness on light-emitting diode performance.
T2 - Nano Letters
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 - 2011
DA - 2011/12/22
PB - American Chemical Society (ACS)
SP - 331-336
IS - 1
VL - 12
PMID - 22148981
SN - 1530-6984
SN - 1530-6992
ER -
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@article{2011_Pal,
author = {Bhola N Pal and Yagnaseni Ghosh and Sergio Brovelli and Rawiwan Laocharoensuk and Victor I. Klimov and Jennifer A. Hollingsworth and Han Htoon},
title = {'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials: strong influence of shell thickness on light-emitting diode performance.},
journal = {Nano Letters},
year = {2011},
volume = {12},
publisher = {American Chemical Society (ACS)},
month = {dec},
url = {https://doi.org/10.1021/nl203620f},
number = {1},
pages = {331--336},
doi = {10.1021/nl203620f}
}
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MLA
Copy
Pal, Bhola N., et al. “'Giant' CdSe/CdS core/shell nanocrystal quantum dots as efficient electroluminescent materials: strong influence of shell thickness on light-emitting diode performance..” Nano Letters, vol. 12, no. 1, Dec. 2011, pp. 331-336. https://doi.org/10.1021/nl203620f.