Efficient near-infrared polymer nanocrystal light-emitting diodes.
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 approximately 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.
Tessler
Nir
N
Electrical Engineering Department, Microelectronic Center, and Communications and Information Technologies Center, Technion-Israel Institute of Technology, Haifa 32000, Israel. nir@ee.technion.ac.il
Medvedev
Vlad
V
Kazes
Miri
M
Kan
ShiHai
S
Banin
Uri
U