Efficient CdSe/CdS Quantum Dot Light-Emitting Diodes Using a Thermally Polymerized Hole Transport Layer
Top Cited Papers
- 1 February 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 6 (3) , 463-467
- https://doi.org/10.1021/nl052417e
Abstract
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.Keywords
This publication has 19 references indexed in Scilit:
- Wave Function Engineering in Elongated Semiconductor Nanocrystals with Heterogeneous Carrier ConfinementNano Letters, 2005
- Large-Area Ordered Quantum-Dot Monolayers via Phase Separation During Spin-CastingAdvanced Functional Materials, 2005
- Drying-mediated self-assembly of nanoparticlesNature, 2003
- Tuning the performance of hybrid organic/inorganic quantum dot light-emitting devicesOrganic Electronics, 2003
- Metastable garnet in oceanic crust at the top of the lower mantleNature, 2002
- Electronic transport in films of colloidal CdSe nanocrystalsPhysical Review B, 2002
- Hybrid Nanorod-Polymer Solar CellsScience, 2002
- Photoinduced electron transfer from conjugated polymers to CdSe nanocrystalsPhysical Review B, 1999
- Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymerNature, 1994
- Angular Dependence of the Emission from a Conjugated Polymer Light‐Emitting Diode: Implications for efficiency calculationsAdvanced Materials, 1994