Citation:
Cristina Bertoni, Diego Gallardo, Steve Dunn, Nikolai Gaponik and Alexander Eychmüller, (2007) Fabrication and characterization of red-emitting electroluminescent devices based on thiol-stabilized semiconductor nanocrystals, Applied Physics Letters, Volume 90, Issue 3, Article number 034107
Abstract:
Thiol-capped CdTe nanocrystals were used to fabricate light-emitting diodes,
consisting of an emissive nanocrystal multilayer deposited via layer-by-layer,
sandwiched between indium-tin-oxide and aluminum electrodes. The emissive and
electrical properties of devices with different numbers of nanocrystal layers
were studied. The improved structural homogeneity of the nanocrystal multilayer
allowed for stable and repeatable current- and electroluminescence-voltage
characteristics. These indicate that both current and electroluminescence are
electric-field dependent. Devices were operated under ambient conditions and a
clear red-light was detected. The best-performing device shows a peak external
efficiency of 0.51% and was measured at 0.35mA/cm2 and 3.3V.
