Quantum Yield Enhancement of Cd/Se Colloidal Quantum Dots by Variation of Surface Ligands

Abstract

Colloidal cadmium/selenium (Cd/Se) quantum dots (QDs) were synthesized with two different sets of ligands. The first used simple components, octadecene (ODE), which serves both as a solvent and a ligand, and oleic acid, which also serves as a ligand. The second used more complex ligands, octadecylphosphonic acid, and oleyamine. Transient samples have been collected during the course of each synthesis. Then the particle diameter and quantum yield (QY) of the samples were calculated from transmission and emission data obtained with UV/VIS spectrometer and flourometer. Calibration data for QY measurements were obtained with reference to the literature data on the QY of a known standard, rhodamine 6G (Rh6G). These measurements helped elucidate the effect surface ligands have on the QY of semiconductor colloidal QDs.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2013
Accession Number
ADA572126

Entities

People

  • David Gudeman
  • W. Pałosz

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Sensors

DTIC Thesaurus Topics

  • Absorption
  • Chemical Compounds
  • Chemical Kinetics
  • Chemistry
  • Diameters
  • Emission
  • Literature
  • Materials
  • Measurement
  • Military Research
  • Oleic Acid
  • Particles
  • Physical Chemistry
  • Quantum Dots
  • Quantum Yields
  • Reaction Time
  • Standards

Fields of Study

  • Chemistry

Readers

  • Aerosol Science/Aerosol Physics
  • Chemistry (specifically Chemical Fluorescence)
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Microelectronics
  • Quantum Computing