Ontology type: schema:ScholarlyArticle
2013-05
AUTHORSBenjamin S. Mashford, Matthew Stevenson, Zoran Popovic, Charles Hamilton, Zhaoqun Zhou, Craig Breen, Jonathan Steckel, Vladimir Bulovic, Moungi Bawendi, Seth Coe-Sullivan, Peter T. Kazlas
ABSTRACTWe report a colour-saturated, red quantum-dot light-emitting device (QLED) using an inverted organic–inorganic hybrid device structure and colloidal CdSe–CdS (core–shell) quantum-dot emitters. The strong electronic coupling of quantum dots to an adjacent layer of ZnO nanocrystals (which form the electron transport layer) facilitates charge transfer, which is responsible for both injecting electrons and maintaining an optimal charge balance for the quantum dot emitters. We show that QLED performance can be modified by controlling the distance of the electroluminescence recombination zone within the quantum dot film from the quantum dot–ZnO interface. Devices are reported with a luminous efficiency of 19 cd A−1, corresponding to an external quantum efficiency of 18% (which is close to the theoretical maximum of 20%) and an internal quantum efficiency of 90%. The corresponding luminous power efficiency exceeds 25 lm W−1 due to the low operating voltage of the device. More... »
PAGES407
http://scigraph.springernature.com/pub.10.1038/nphoton.2013.70
DOIhttp://dx.doi.org/10.1038/nphoton.2013.70
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