Narrow-band single-photon emission through selective aryl functionalization of zigzag carbon nanotubes

Avishek Saha, Brendan J. Gifford, Xiaowei He, Geyou Ao, Ming Zheng, Hiromichi Kataura, Han Htoon, Svetlana Kilina, Sergei Tretiak, Stephen K. Doorn

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

The introduction of sp 3 defects into single-walled carbon nanotubes through covalent functionalization can generate new light-emitting states and thus dramatically expand their optical functionality. This may open up routes to enhanced imaging, photon upconversion, and room-temperature single-photon emission at telecom wavelengths. However, a significant challenge in harnessing this potential is that the nominally simple reaction chemistry of nanotube functionalization introduces a broad diversity of emitting states. Precisely defining a narrow band of emission energies necessitates constraining these states, which requires extreme selectivity in molecular binding configuration on the nanotube surface. We show here that such selectivity can be obtained through aryl functionalization of so-called ‘zigzag’ nanotube structures to achieve a threefold narrowing in emission bandwidth. Accompanying density functional theory modelling reveals that, because of the associated structural symmetry, the defect states become degenerate, thus limiting emission energies to a single narrow band. We show that this behaviour can only result from a predominant selectivity for ortho binding configurations of the aryl groups on the nanotube lattice.

Original languageEnglish
Pages (from-to)1089-1095
Number of pages7
JournalNature Chemistry
Volume10
Issue number11
DOIs
Publication statusPublished - 1 Nov 2018
Externally publishedYes

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