Excitation Wavelength-Dependent Photoluminescence Decay Of Hybrid Gold/Quantum Dot Nanostructures

Abstract

Hybrid nanostructures comprised of metal nanoparticles (MNPs) and quantum dots (QDs) have been found to exhibit unique, new optical properties due to the interaction that occurs between the MNPs and QDs. The aim of this work is to understand how the exciton-plasmon interaction in these systems is dependent on the excitation wavelength. The nanoassemblies consisted of gold (Au) NPs coated in a silica (SiO2) shell of a controlled thickness and core/shell CdSe/CdS QDs adsorbed onto the SiO2 shells. Our findings show that the photoluminescence lifetimes of the hybrid constructs are dependent on the excitation wavelength relative to the localized surface plasmon resonance (LSPR) of the Au NPs. When the excitation wavelength is closer to the LSPR, the photoluminescence decay of the hybrid structures is faster. We demonstrate that by tuning the excitation wavelength close to the resonance, there is an enhancement in the exciton-plasmon coupling between the Au NPs and QDs resulting in a shortening in the QD photoluminescence lifetime. We then propose a possible mechanism to explain this excitation wavelength-dependent phenomenon.

Publication Date

10-25-2018

Publication Title

ACS Omega

Volume

3

Issue

10

Number of Pages

14151-14156

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/acsomega.8b01959

Socpus ID

85055819422 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85055819422

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