Accession Number:

ADA621285

Title:

Optical Spectroscopy of Hybrid Semiconductor Quantum Dots and Metal Nanoparticles

Descriptive Note:

Final rept. 9 May 2011-8 Aug 2014

Corporate Author:

HAMPTON UNIV VA

Personal Author(s):

Report Date:

2014-11-07

Pagination or Media Count:

57.0

Abstract:

Optical studies of semiconductor quantum dots SQDs, metal nanoparticles MNPs, and their hybrid nanomaterials are great interests for the Department of Defenses DoD photonic applications. Our research focused on developing and characterizing advanced optical nanomaterials of hybrid plasmon-coupled semiconductor quantum dots, II-VI semiconductor QDs, and I-III-VI2 semiconductor nanocrystals SNCs. The coupling distances between the mono-layers of Au nanoparticles were controlled by PMMA plasma etching. The time-resolved spectroscopy of plasmon-coupled II-VI semiconductor QDs revealed a strong shortening of the longest lifetime and approximately 9-fold PL enhancement. For the I-III-VI2 semiconductor nanocrystals, both time-resolved and temperature-dependent photoluminescence spectroscopy revealed their optical properties with spectral, temporal, and thermal characteristics which were closely linked to surface related recombination, and shallow or deep defect-related donor-acceptor transitions. The good spectral coupling between the PL from CISZnS with a broad spectral width and the InGaN diode excitation leads to the realization of hybrid white LEDs.

Subject Categories:

  • Physical Chemistry
  • Electrooptical and Optoelectronic Devices
  • Atomic and Molecular Physics and Spectroscopy
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE