Synergistic tunability of fluorescence using coupled quantum dots

Sucheta Sengupta, Somobrata Acharya

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Size and shape controlled semiconductor quantum dots have been widely adopted in tailoring nanomaterials properties, which basically utilize band edge engineering extending the band gap to larger values than the bulk. However, the long range electronic transition tunability is difficult to achieve using size or shape controlled quantum dots. Alternatively, chemically coupled quantum dots offer a novel route for tuning long range electronic transitions of semiconductors via band offset engineering at the material interface. We report on a simple route of tailoring visible emissions over long range by chemically designing coupled dots comprising of ZnSe and CdS quantum dots. Long range tunability of visible emissions originated from strong interdot dispersion, which can not be realized from individual quantum dots. A variation of component size or extend of coupling led to the tuning of visible emission wavelengths, the intensity of which can be controlled by temperature. The first principles electronic structure calculations based on density functional theory reveals the type-II nature of chemical bonding at CdS/ZnSe interface which plays a crucial role in tailoring the long range emissions. Such novel class of asymmetric coupled structures may offer a basis for diverse set of building blocks for optoelectronic devices, ultrahigh density memories and quantum information processing.

Original languageEnglish
Title of host publicationSolid State Physics - Proceedings of the 55th DAE Solid State Physics Symposium 2010
Pages75-78
Number of pages4
EditionPART A
DOIs
StatePublished - 12 Sep 2011
Externally publishedYes
Event55th DAE Solid State Physics Symposium 2010 - Manipal, India
Duration: 26 Dec 201030 Dec 2010

Publication series

NameAIP Conference Proceedings
NumberPART A
Volume1349
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference55th DAE Solid State Physics Symposium 2010
Country/TerritoryIndia
CityManipal
Period26/12/1030/12/10

Keywords

  • Coupled quantum dot
  • DFT calculations
  • Long range visible emission
  • emission tunability
  • type-II interface

ASJC Scopus subject areas

  • General Physics and Astronomy

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