By a News Reporter-Staff News Editor at Electronics Newsweekly -- New research on Nanocrystals is the subject of a report. According to news reporting out of Argonne, Illinois, by VerticalNews editors, research stated, "The tens-of-percent photoluminescence (PL) quantum yields routinely obtained for colloidally prepared CdSe semiconductor nanocrystals (NCs) decrease substantially with temperature elevation. While such PL efficiency loss has direct consequences for applications ranging from light-emitting diodes and lasers to photovoltaics under solar concentration, the origin of this loss is currently not established, hindering synthetic efforts to design materials with robust performance."
Our news journalists obtained a quote from the research from Argonne National Laboratory, "Here, for the first time, we utilize transient absorption and ultrafast PL in addition to static PL and time-correlated single photon counting, to characterize CdSe core-only and CdSe/ZnS core/shell NCs up to temperatures as high as 800 K. For multiple particle sizes, loss of PL efficiency as a function of temperature elevation is more severe and less reversible for core-only NCs than for core/shell NCs. Ultrafast measurements performed at elevated sample temperatures indicate that thermally activated trapping of individual carriers dominates the nonradiative loss of excitons. Through a combination of spectroscopic techniques, we identify the primary carrier loss process as hole trapping in particular."
According to the news editors, the research concluded: "These findings support the notion that extrinsic trapping effects out-compete intrinsic exciton deactivation at high temperature and point to realizable improvements in thermally robust optoelectronic performance."
For more information on this research see: Exciton Fate in Semiconductor Nanocrystals at Elevated Temperatures: Hole Trapping Outcompetes Exciton Deactivation. Journal of Physical Chemistry C, 2013;117(33):17337-17343. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)
Our news journalists report that additional information may be obtained by contacting C.E. Rowland, Argonne Natl Lab, Center Nanoscale Mat, Argonne, IL 60439, United States.
Keywords for this news article include: Argonne, Illinois, Electronics, United States, Semiconductor, Nanotechnology, Emerging Technologies, North and Central America
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