Efficient Near-Infrared Polymer Nanocrystal Light-Emitting Diodes
Nir Tessler,1*
Vlad Medvedev,1
Miri Kazes,2
ShiHai Kan,2
Uri Banin2*
Conjugated polymers and indium arsenide-based
nanocrystals were used to create near-infrared plastic light-emitting
diodes. Emission was tunable from 1 to 1.3 micrometers--a range that
effectively covers the short-wavelength telecommunications
band--by means of the quantum confinement effects in the
nanocrystals. The external efficiency value (photons out
divided by electrons in) is ~0.5% (that is, >1% internal) and is
mainly limited by device architecture. The near-infrared emission did
not overlap the charge-induced absorption bands of the polymer.
1 Electrical Engineering Department,
Microelectronic Center, and Communications and Information Technologies
Center, Technion-Israel Institute of Technology, Haifa 32000, Israel.
2 Institute of Chemistry and the Center for
Nanoscience and Nanotechnology, Hebrew University, Jerusalem 91904, Israel.
*
To whom correspondence should be addressed. E-mail:
nir{at}ee.technion.ac.il, banin{at}chem.ch.huji.ac.il
