Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 59, Number 11
Friday–Saturday, October 17–18, 2014; Orem, Utah
Session A1: Plenary I |
Hide Abstracts |
Chair: Bonnie Andersen, Utah Valley University Room: Science Building 134 |
Friday, October 17, 2014 8:45AM - 9:24AM |
A1.00001: Welcome |
Friday, October 17, 2014 9:24AM - 10:00AM |
A1.00002: Quantum dots with engineered interfaces for light-emitting diodes Invited Speaker: Victor Klimov Lighting consumes almost one-fifth of all electricity generated today. A dramatic improvement in lighting efficiency is possible by replacing traditional incandescent bulbs by light-emitting diodes (LEDs) in which current is directly converted into photons via the process of electroluminescence. The focus of this presentation is on the emerging technology of LEDs that use solution-processed semiconductor quantum dots (QDs) as light emitters. QDs are nanosized semiconductor particles whose emission color can be tuned by simply changing their dimensions. They feature near-unity emission quantum yields and narrow emission bands, which results in excellent color purity. These properties make QDs attractive for applications in lighting and display technologies. This presentation overviews spectroscopic studies of QDs that address the problem of nonradiative carrier losses in QD-LEDs, and approaches for its mitigation via the appropriate design of QD emitters. We consider processes such as carrier recombination via surface defects including hot-electron trapping, discussed in the context of QD emission intermittency (``blinking''). We also analyze nonradiative Auger recombination in the presence of extra charges, and specifically, the asymmetry between recombination pathways in positively and negatively charged QDs. Finally, we provide evidence for the direct relation of Auger recombination to the problem of LED efficiency roll-off (known also as a ``droop effect'') at high driving currents, suggesting that the realization of high-performance LEDs might require a new generation of ``Auger-decay-engineered'' QDs that in addition to being efficient single-exciton emitters would also show high emission efficiency in the multicarrier regime. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700