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Proceedings Paper

Photoluminescence quantum yields of PbSe and PbS QDs in the range of 1000 nm to 2000 nm (Conference Presentation)
Author(s): Matthew C. Beard; Octavi E. Semonin; Justin C. Johnson; Ashley Marshall; Jianbing Zhang; Boris D. Chernomordik
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Paper Abstract

PbS and PbSe quantum dots (QDs) are promising strong infrared emitters. We have developed several synthetic routes to producing PbS and PbSe QDs with a variety of sizes such that the bandgap can be continuously tuned from 2000 to 1000 nm. We provide a simple and accurate synthetic route to reproducibly produce PbS QDs with a narrow size-distribution and high chemical yield. The different synthetic routes lead to differences in their surface chemistry and to differences in their air stability and photoluminescence quantum yields (PLQY). To characterize the PLQY we directly measured the PLQY IR-26 (a standard IR emitting organic dye) at a range of concentrations as well as the PLQY of PbS and PbSe QDs for a range of sizes. We find that the PLQY of IR-26 has a weak concentration dependence due to reabsorption, with a PLQY of 0:048_0:002% for low concentrations, lower than previous reports by a full order of magnitude. We also find a dramatic size dependence for both PbS and PbSe QDs, with the smallest dots exhibiting a PLQY in excess of 60% while larger dots fall below 3%. A model, including nonradiative transition between electronic states and energy transfer to ligand vibrations, appears to explain this size dependence. These findings provide both a better characterization of photoluminescence for near infrared emitters. Halogen surface passivation provides both a larger PLQY (~ 30% improvement) as well as increased air stability.

Paper Details

Date Published: 27 April 2016
PDF: 1 pages
Proc. SPIE 9723, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications VIII, 97230F (27 April 2016); doi: 10.1117/12.2211728
Show Author Affiliations
Matthew C. Beard, National Renewable Energy Lab. (United States)
Octavi E. Semonin, National Renewable Energy Lab. (United States)
Justin C. Johnson, National Renewable Energy Lab. (United States)
Ashley Marshall, National Renewable Energy Lab. (United States)
Jianbing Zhang, National Renewable Energy Lab. (United States)
Boris D. Chernomordik, National Renewable Energy Lab. (United States)


Published in SPIE Proceedings Vol. 9723:
Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications VIII
Samuel Achilefu; Ramesh Raghavachari, Editor(s)

Video Presentation

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