Spatially indirect emission in a luminescent nanocrystal molecule

Charina L. Choi, Hui Li, Andrew C.K. Olson, Prashant K. Jain, Sanjeevi Sivasankar, A. Paul Alivisatos

Research output: Contribution to journalArticle

Abstract

Recent advances in the synthesis of multicomponent nanocrystals have enabled the design of nanocrystal molecules with unique photophysical behavior and functionality. Here we demonstrate a highly luminescent nanocrystal molecule, the CdSe/CdS core/shell tetrapod, which is designed to have weak vibronic coupling between excited states and thereby violates Kasha's rule via emission from multiple excited levels. Using single particle photoluminescence spectroscopy, we show that in addition to the expected LUMO to HOMO radiative transition, a higher energy transition is allowed via spatially indirect recombination. The oscillator strength of this transition can be experimentally controlled, enabling control over carrier behavior and localization at the nanoscale.

Original languageEnglish (US)
Pages (from-to)2358-2362
Number of pages5
JournalNano letters
Volume11
Issue number6
DOIs
StatePublished - Jun 8 2011
Externally publishedYes

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Keywords

  • CdSe/CdS core/shell
  • indirect emission
  • luminescence
  • Nanocrystal molecule

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Choi, C. L., Li, H., Olson, A. C. K., Jain, P. K., Sivasankar, S., & Alivisatos, A. P. (2011). Spatially indirect emission in a luminescent nanocrystal molecule. Nano letters, 11(6), 2358-2362. https://doi.org/10.1021/nl2007032