29 March 2013 Stability studies of lead sulfide colloidal quantum dot films on glass and GaAs substrates
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The stability of colloidal PbS quantum dot (QD) films deposited on various substrates including glass and GaAs was studied. Over a period of months, the QD film sample was re-tested after being left unprotected in air under ambient conditions. Despite exposure to 532 nm laser excitation and cooling to cryogenic temperatures, the initial photoluminescence (PL) remained stable between tests. We also retested a set of samples that had remained under ambient conditions for over 2 years. To track potential changes to the QDs over time, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), optical microscopy, UV-Vis-NIR spectrophotometry and atomic force microscopy (AFM) were employed. Evidence points towards oxidation enforced shrinking of the active QD volume causing a blue shift of the absorption and photoluminescence. The presented studies are important for reliability expectations of light emitters based on PbS QDs.
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Joanna S. Wang, Joanna S. Wang, Elizabeth H. Steenbergen, Elizabeth H. Steenbergen, Howard E. Smith, Howard E. Smith, Lawrence Grazulis, Lawrence Grazulis, Jeremy A. Massengale, Jeremy A. Massengale, Bruno Ullrich, Bruno Ullrich, Gail J. Brown, Gail J. Brown, } "Stability studies of lead sulfide colloidal quantum dot films on glass and GaAs substrates", Proc. SPIE 8634, Quantum Dots and Nanostructures: Synthesis, Characterization, and Modeling X, 86340T (29 March 2013); doi: 10.1117/12.2002499; https://doi.org/10.1117/12.2002499

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