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Title: Multi-exciton emission from solitary dopant states of carbon nanotubes

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/c7nr06661a· OSTI ID:1673361

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. Here, 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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1673361
Report Number(s):
LA-UR-18-29325
Journal Information:
Nanoscale, Vol. 9, Issue 42; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Exciton relaxation in carbon nanotubes via electronic-to-vibrational energy transfer journal October 2019

Figures / Tables (2)