Brightening of carbon nanotube photoluminescence through the incorporation of sp 3 defects

Yanmei Piao, Brendan Meany, Lyndsey R. Powell, Nicholas Valley, Hyejin Kwon, George C. Schatz, Yuhuang Wang

Research output: Contribution to journalArticle

203 Citations (Scopus)

Abstract

Semiconducting carbon nanotubes promise a broad range of potential applications in optoelectronics and imaging, but their photon-conversion efficiency is relatively low. Quantum theory suggests that nanotube photoluminescence is intrinsically inefficient because of low-lying 'dark' exciton states. Here we demonstrate the significant brightening of nanotube photoluminescence (up to 28-fold) through the creation of an optically allowed defect state that resides below the predicted energy level of the dark excitons. Emission from this new state generates a photoluminescence peak that is red-shifted by as much as 254 meV from the nanotube's original excitonic transition. We also found that the attachment of electron-withdrawing substituents to carbon nanotubes systematically drives this defect state further down the energy ladder. Our experiments show that the material's photoluminescence quantum yield increases exponentially as a function of the shifted emission energy. This work lays the foundation for chemical control of defect quantum states in low-dimensional carbon materials.

Original languageEnglish
Pages (from-to)840-845
Number of pages6
JournalNature chemistry
Volume5
Issue number10
DOIs
Publication statusPublished - Oct 1 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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