NDLI: Photoluminescence imaging of solitary dopant sites in covalently doped single-wall carbon nanotubes

Content Provider	Royal Society of Chemistry (RSC)
Author	Yalcin, Sibel Ebru Tretiak, Sergei Hartmann, Nicolai F. Hároz, Erik H. Ma, Xuedan Adamska, Lyudmyla Htoon, Han Doorn, Stephen K.
Copyright Year	2015
Abstract	Covalent dopants in semiconducting single wall carbon nanotubes (SWCNTs) are becoming important as routes for introducing new photoluminescent emitting states with potential for enhanced quantum yields, new functionality, and as species capable of near-IR room-temperature single photon emission. The origin and behavior of the dopant-induced emission is thus important to understand as a key requirement for successful room-T photonics and optoelectronics applications. Here, we use direct correlated two-color photoluminescence imaging to probe how the interplay between the SWCNT bright E11 exciton and solitary dopant sites yields the dopant-induced emission for three different dopant species: oxygen, 4-methoxybenzene, and 4-bromobenzene. We introduce a route to control dopant functionalization to a low level as a means for introducing spatially well-separated solitary dopant sites. Resolution of emission from solitary dopant sites and correlation to their impact on E11 emission allows confirmation of dopants as trapping sites for localization of E11 excitons following their diffusive transport to the dopant site. Imaging of the dopant emission also reveals photoluminescence intermittency (blinking), with blinking dynamics being dependent on the specific dopant. Density functional theory calculations were performed to evaluate the stability of dopants and delineate the possible mechanisms of blinking. Theoretical modeling suggests that the trapping of free charges in the potential well created by permanent dipoles introduced by dopant atoms/groups is likely responsible for the blinking, with the strongest effects being predicted and observed for oxygen-doped SWCNTs.
Starting Page	20521
Ending Page	20530
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	48
Journal	Nanoscale
DOI	10.1039/c5nr06343d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Carbon nanotube Quantum Optoelectronics Exciton Oxygen Photoluminescence Interplay Entertainment Dopant Bromobenzene Density functional theory Photon Photonics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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