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Electroluminescence from light-emitting polymer/ZnO nanoparticle heterojunctions at sub-bandgap voltages

Paper ID Volume ID Publish Year Pages File Format Full-Text
32279 44919 2010 6 PDF Available
Title
Electroluminescence from light-emitting polymer/ZnO nanoparticle heterojunctions at sub-bandgap voltages
Abstract

SummaryThe 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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (149 K)Download as PowerPoint slideResearch highlights▶ Light emission from polymer light emitting devices (PLEDs) was observed at energies less than the photon energy. ▶ Energy up-conversion Auger process resulted in photon emission at sub-bandgap energy (driving voltages). ▶ A layer of <5 nm diameter ZnO nanoparticles was necessary to observe sub-bandgap emission.

Keywords
PLED; Zinc oxide nanoparticles; Electroluminescence; Auger up-conversion
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Electroluminescence from light-emitting polymer/ZnO nanoparticle heterojunctions at sub-bandgap voltages
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Publisher
Database: Elsevier - ScienceDirect
Journal: - Volume 5, Issue 5, 2010, Pages 384–389
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us