Highly luminescent double-heterojunction nanorods

Gryphon A. Drake, Joseph C. Flanagan, Moonsub Shim

Research output: Contribution to journalArticle

Abstract

Anisotropic shape and band structure engineered into double-heterojunction nanorods (DHNRs) can improve and impart new optical/optoelectronic capabilities in colloidal quantum dot-based devices. However, the photoluminescence quantum yield of DHNRs, which is significantly lower than the near-ideal limit recently achieved in the state-of-the-art core/shell quantum dots, remains as their main limitation. Here, we examine how the photoluminescence of CdS/CdSe/ZnSe DHNRs is affected by (1) the length of the CdS seed nanorods, (2) the rod and tip diameter dependent variations in band offset, and (3) the CdSe-like islands on the sides of DHNRs that can result as a side-product of ZnSe shell growth. By understanding and optimizing these three key parameters, we demonstrate an improvement in the photoluminescence quantum yield up to 93% (up to 62% for excitation above CdS bandgap) while retaining useful shape anisotropy and the band structure design in DHNRs.

Original languageEnglish (US)
Article number134706
JournalJournal of Chemical Physics
Volume151
Issue number13
DOIs
StatePublished - Oct 7 2019

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Nanorods
nanorods
Heterojunctions
heterojunctions
Photoluminescence
Quantum yield
photoluminescence
Band structure
Semiconductor quantum dots
quantum dots
retaining
Optoelectronic devices
Seed
seeds
Energy gap
Anisotropy
rods
anisotropy
products
excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Highly luminescent double-heterojunction nanorods. / Drake, Gryphon A.; Flanagan, Joseph C.; Shim, Moonsub.

In: Journal of Chemical Physics, Vol. 151, No. 13, 134706, 07.10.2019.

Research output: Contribution to journalArticle

Drake, Gryphon A. ; Flanagan, Joseph C. ; Shim, Moonsub. / Highly luminescent double-heterojunction nanorods. In: Journal of Chemical Physics. 2019 ; Vol. 151, No. 13.
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