Colloidal Quantum-Dot Light-Emitting Technologies

Dr Ben Mashford

Centre for Micro-Photonics, Swinburne University of Technology

3:30 pm Friday, 22 February 2013, EN313 Lecture Theatre (EN Building), Hawthorn.

Semiconductor quantum dots (QDs) exhibit size-dependent optical and electrical properties that offer potential for use in a range of optoelectronic applications. The spatial confinement of energy in these nanostructures leads a number of behaviours not seen in bulk semiconductors, including a size-tunable band gap and very high emission efficiencies. One current area of research activity is the development of structures for electrically-driven QD emission. By incorporating QDs into thin film light-emitting devices (LEDs), affordable solid-state lighting and display technologies may be realised via the use of printable, semiconductor inks. These QD-LEDs retain the inherent emission characteristics of QDs with respect to colour and efficiency. The development of efficient QD-LEDs is a multidisciplinary research effort that spans QD physics, materials chemistry and nanoscale device fabrication.

In this presentation, I will give an overview of current work in this field and discuss the physical model that underlies the operation of QD electroluminescence. I will also address the scientific and engineering challenges that must be overcome before QD-LEDs can become a widely-used technology.

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