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:
-
- Los Alamos National Laboratory
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (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. 2012.
"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 = {},
url = {https://www.osti.gov/biblio/1044829},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 21 00:00:00 EDT 2012},
month = {Thu Jun 21 00:00:00 EDT 2012}
}