Scientists map energy transfer in quantum dot arrays for brighter displays
Researchers have identified how light energy moves between different-sized quantum dots stacked in layers, a finding that could improve efficiency in next-generation displays and optoelectronic devices. Understanding these energy pathways helps manufacturers optimize light-emitting materials and reduce power consumption in consumer electronics.
Originaltitel: Recombination dynamics in heterostructures with two planar arrays of II-VI quantum dots
<p>We present time-resolved photoluminescence studies of epitaxial heterostructures with two arrays of Cd(Zn)Se/ZnSe quantum dots (QDs), which are formed by the successive insertion of CdSe fractional monolayers of different nominal thicknesses into a ZnSe matrix. Our data are suggestive of the appearance of effective channels of the energy transfer from the insertion comprising the array with smaller QDs, emitting at higher energy, towards the array with larger QDs, emitting at lower energy. The effect of dark excitons on characteristic times of radiative recombination is discussed.</p>