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Zhao, Jialong; Bardecker, Julie A; Munro, Andrea M; Liu, Michelle S; Niu, Yuhua; Ding, I-Kang; Luo, Jingdong; Chen, Baoquan; Jen, Alex K.-Y; Ginger, David S
Nano letters, 03/2006, Letnik: 6, Številka: 3Journal Article
We report multilayer nanocrystal quantum dot light-emitting diodes (QD-LEDs) fabricated by spin-coating a monolayer of colloidal CdSe/CdS nanocrystals on top of thermally polymerized solvent-resistant hole-transport layers (HTLs). We obtain high-quality QD layers of controlled thickness (down to submonolayer) simply by spin-coating QD solutions directly onto the HTL. The resulting QD-LEDs exhibit narrow (∼30 nm, fwhm) electroluminescence from the QDs with virtually no emission from the organic matrix at any voltage. Using multiple spin-on HTLs improves the external quantum efficiency of the QD-LEDs to ∼0.8% at a brightness of 100 cd/m2 (with a maximum brightness over 1000 cd/m2). We conclude that QD-LEDs could be made more efficient by further optimization of the organic semiconductors.
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