Multi-exciton emission from solitary dopant states of carbon nanotubes

Xuedan Ma, Nicolai F. Hartmann, Kirill A. Velizhanin, Jon K.S. Baldwin, Lyudmyla Adamska, Sergei Tretiak, Stephen K. Doorn, Han Htoon

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

By separating the photons from slow and fast decays of single and multi-exciton states in a time gated 2nd order photon correlation experiment, we show that solitary oxygen dopant states of single-walled carbon nanotubes (SWCNTs) allow emission of photon pairs with efficiencies as high as 44% of single exciton emission. Our pump dependent time resolved photoluminescence (PL) studies further reveal diffusion-limited exciton-exciton annihilation as the key process that limits the emission of multi-excitons at high pump fluences. We further postulate that creation of additional permanent exciton quenching sites occurring under intense laser irradiation leads to permanent PL quenching. With this work, we bring out multi-excitonic processes of solitary dopant states as a new area to be explored for potential applications in lasing and entangled photon generation.

Original languageEnglish
Pages (from-to)16143-16148
Number of pages6
JournalNanoscale
Volume9
Issue number42
DOIs
Publication statusPublished - 14 Nov 2017
Externally publishedYes

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