Photon Correlation Spectroscopy of Luminescent Quantum Defects in Carbon Nanotubes.
Nano Lett
; 19(10): 7078-7084, 2019 10 09.
Article
em En
| MEDLINE
| ID: mdl-31478677
ABSTRACT
Defect-decorated single-wall carbon nanotubes have shown rapid growing potential for imaging, sensing, and the development of room-temperature single-photon sources. The key to the highly nonclassical emission statistics is the discrete energy spectrum of defect-localized excitons. However, variations in defect configurations give rise to distinct spectral bands that may compromise single-photon efficiency and purity in practical devices, and experimentally it has been challenging to study the exciton population distribution among the various defect-specific states. Here, we performed photon correlation spectroscopy on hexyl-decorated single-wall carbon nanotubes to unravel the dynamics and competition between neutral and charged exciton populations. With autocorrelation measurements at the single-tube level, we prove the nonclassical photon emission statistics of defect-specific exciton and trion photoluminescence and identify their mutual exclusiveness in photoemissive events with cross-correlation spectroscopy. Moreover, our study reveals the presence of a dark state with population-shelving time scales between 10 and 100 ns. These new insights will guide further development of chemically tailored carbon nanotube states for quantum photonics applications.
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Bases de dados:
MEDLINE
Idioma:
En
Revista:
Nano Lett
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Alemanha