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Title: Synthesis of Non-blinking Semiconductor Quantum Dots Emitting in the Near-Infrared

Abstract

Our previous work demonstrates that Quasi-Type II CdSe/CdS core-shell quantum dots with thick shells (3-5 nm) exhibit unique photophysical characteristics, including improved chemical robustness over typical thin-shelled core/shell systems and the elimination of blinking through suppression of nonradiative Auger recombination. Here we describe a new thick-shelled heterostructure, InP/CdS, which exhibits a Type II bandgap alignment producing near-infrared (NIR) emission. Samples with a range of shell thicknesses were synthesized, enabling shell-thickness-dependent study of the absorbance and emission spectra, fluorescence lifetimes, and quantum yields. InP/CdS/ZnS core/shell/shell structures were also synthesized to reduce cadmium exposure for applications in the biological environment. Single particle spectroscopy indicates reduced blinking and improved photostability with increasing shell thickness, resulting in thick-shelled dots that are appropriate for single-particle tracking measurements with NIR emission.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1044829
Report Number(s):
LA-UR-12-22429
TRN: US201214%%513
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: American Chemical Society ; 2012-03-25 - 2012-03-25 ; San Diego, California, United States
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALIGNMENT; CADMIUM; EMISSION SPECTRA; FLUORESCENCE; QUANTUM DOTS; RECOMBINATION; SPECTROSCOPY; SYNTHESIS; THICKNESS

Citation Formats

Dennis, Allison M, Mangum, Benjamin D, Piryatinski, Andrei, Park, Young-Shin, Htoon, Han, and Hollingsworth, Jennifer A. Synthesis of Non-blinking Semiconductor Quantum Dots Emitting in the Near-Infrared. United States: N. p., 2012. Web.
Dennis, Allison M, Mangum, Benjamin D, Piryatinski, Andrei, Park, Young-Shin, Htoon, Han, & Hollingsworth, Jennifer A. Synthesis of Non-blinking Semiconductor Quantum Dots Emitting in the Near-Infrared. United States.
Dennis, Allison M, Mangum, Benjamin D, Piryatinski, Andrei, Park, Young-Shin, Htoon, Han, and Hollingsworth, Jennifer A. Thu . "Synthesis of Non-blinking Semiconductor Quantum Dots Emitting in the Near-Infrared". United States. https://www.osti.gov/servlets/purl/1044829.
@article{osti_1044829,
title = {Synthesis of Non-blinking Semiconductor Quantum Dots Emitting in the Near-Infrared},
author = {Dennis, Allison M and Mangum, Benjamin D and Piryatinski, Andrei and Park, Young-Shin and Htoon, Han and Hollingsworth, Jennifer A},
abstractNote = {Our previous work demonstrates that Quasi-Type II CdSe/CdS core-shell quantum dots with thick shells (3-5 nm) exhibit unique photophysical characteristics, including improved chemical robustness over typical thin-shelled core/shell systems and the elimination of blinking through suppression of nonradiative Auger recombination. Here we describe a new thick-shelled heterostructure, InP/CdS, which exhibits a Type II bandgap alignment producing near-infrared (NIR) emission. Samples with a range of shell thicknesses were synthesized, enabling shell-thickness-dependent study of the absorbance and emission spectra, fluorescence lifetimes, and quantum yields. InP/CdS/ZnS core/shell/shell structures were also synthesized to reduce cadmium exposure for applications in the biological environment. Single particle spectroscopy indicates reduced blinking and improved photostability with increasing shell thickness, resulting in thick-shelled dots that are appropriate for single-particle tracking measurements with NIR emission.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {6}
}

Conference:
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