Journal
NANO TODAY
Volume 5, Issue 5, Pages 384-389Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2010.08.010
Keywords
PLED; Zinc oxide nanoparticles; Electroluminescence; Auger up-conversion
Categories
Funding
- Army Research Office [W911NF-07-1-0545]
- US Department of Energy [DE-FC26-06NT42855]
- Florida Energy Systems Consortium
- US Department of Energy Office of Basic Sciences [DE-FG0207ER46464]
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The turn-on voltage of a light-emitting diode is generally equal to or greater than its bandgap voltage (or the bandgap energy divided by the electron charge). In contrast, we have found that electroluminescence at sub-bandgap voltages can be observed in polymer light-emitting devices with a heterojunction based on ZnO nanoparticles (NPs). This sub-bandgap electroluminescence is attributed to an Auger-assisted energy up-conversion process at the polymer/ZnO NPs interface, the observation of which depends strongly on the size of the nanoparticles. (C) 2010 Elsevier Ltd. All rights reserved.
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