skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Bandgap Engineering of InP QDs Through Shell Thickness and Composition

Abstract

Fields as diverse as biological imaging and telecommunications utilize the unique photophysical and electronic properties of nanocrystal quantum dots (NQDs). The development of new NQD compositions promises material properties optimized for specific applications, while addressing material toxicity. Indium phosphide (InP) offers a 'green' alternative to the traditional cadmium-based NQDs, but suffers from extreme susceptibility to oxidation. Coating InP cores with more stable shell materials significantly improves nanocrystal resistance to oxidation and photostability. We have investigated several new InP-based core-shell compositions, correlating our results with theoretical predictions of their optical and electronic properties. Specifically, we can tailor the InP core-shell QDs to a type-I, quasi-type-II, or type-II bandgap structure with emission wavelengths ranging from 500-1300 nm depending on the shell material used (ZnS, ZnSe, CdS, or CdSe) and the thickness of the shell. Single molecule microscopy assessments of photobleaching and blinking are used to correlate NQD properties with shell thickness.

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:
1044830
Report Number(s):
LA-UR-12-22430
TRN: US201214%%514
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; COATINGS; INDIUM PHOSPHIDES; MICROSCOPY; OXIDATION; QUANTUM DOTS; THICKNESS; TOXICITY; WAVELENGTHS

Citation Formats

Dennis, Allison M, Mangum, Benjamin D, Piryatinski, Andrei, Park, Young-Shin, Htoon, Han, and Hollingsworth, Jennifer A. Bandgap Engineering of InP QDs Through Shell Thickness and Composition. United States: N. p., 2012. Web.
Dennis, Allison M, Mangum, Benjamin D, Piryatinski, Andrei, Park, Young-Shin, Htoon, Han, & Hollingsworth, Jennifer A. Bandgap Engineering of InP QDs Through Shell Thickness and Composition. United States.
Dennis, Allison M, Mangum, Benjamin D, Piryatinski, Andrei, Park, Young-Shin, Htoon, Han, and Hollingsworth, Jennifer A. Thu . "Bandgap Engineering of InP QDs Through Shell Thickness and Composition". United States. https://www.osti.gov/servlets/purl/1044830.
@article{osti_1044830,
title = {Bandgap Engineering of InP QDs Through Shell Thickness and Composition},
author = {Dennis, Allison M and Mangum, Benjamin D and Piryatinski, Andrei and Park, Young-Shin and Htoon, Han and Hollingsworth, Jennifer A},
abstractNote = {Fields as diverse as biological imaging and telecommunications utilize the unique photophysical and electronic properties of nanocrystal quantum dots (NQDs). The development of new NQD compositions promises material properties optimized for specific applications, while addressing material toxicity. Indium phosphide (InP) offers a 'green' alternative to the traditional cadmium-based NQDs, but suffers from extreme susceptibility to oxidation. Coating InP cores with more stable shell materials significantly improves nanocrystal resistance to oxidation and photostability. We have investigated several new InP-based core-shell compositions, correlating our results with theoretical predictions of their optical and electronic properties. Specifically, we can tailor the InP core-shell QDs to a type-I, quasi-type-II, or type-II bandgap structure with emission wavelengths ranging from 500-1300 nm depending on the shell material used (ZnS, ZnSe, CdS, or CdSe) and the thickness of the shell. Single molecule microscopy assessments of photobleaching and blinking are used to correlate NQD properties with shell thickness.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {6}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: