Photoluminescence saturation independent of excitation pathway in air-suspended single-walled carbon nanotubes

Xiao, Yee-Fang; Anderson, Mitchell D.; Fraser, James M.

doi:10.1103/physrevb.89.235440

Cited by 4 publications

(6 citation statements)

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“…, where t ¢ is the delay time (see [5]). The measured relaxation lifetime was 10 ps, significantly shorter than typical exciton population relaxation times observed in longer pristine SWCNT samples [5,35,36], as expected due to environmental perturbations and end quenching.…”

Section: Time-resolved Optical Absorption Studiessupporting

confidence: 44%

“…The relaxation lifetime (τ ) of this SWCNT cluster was fit using the FEC signal assuming a mono-exponential decay, F EC ∝ τ ′ 0 exp(−t/τ )dt, where τ ′ is the delay time (see Ref: [5]). The measured relaxation lifetime was 10 ps, significantly shorter than typical exciton population relaxation times observed in longer pristine SWCNT samples [5,34,35], as expected due to environmental perturbations and end quenching.…”

Section: Time-resolved Optical Absorption Studiessupporting

confidence: 44%

“…In this study, both the optical absorption and the PL measured as the sum signal of the two excitation pulses. Figure : 5 (a) gives a typical FEC signal demonstrating the SWCNT exciton population relaxation [5,8,34]. The relaxation lifetime (τ ) of this SWCNT cluster was fit using the FEC signal assuming a mono-exponential decay, F EC ∝ τ ′ 0 exp(−t/τ )dt, where τ ′ is the delay time (see Ref: [5]).…”

Section: Time-resolved Optical Absorption Studiesmentioning

confidence: 99%

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Independence of optical absorption on Auger ionization in single-walled carbon nanotubes revealed by ultrafast e–h photodoping

et al. 2016

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Auger-ionized free-carriers in a one-dimensional semiconductor are predicted to result in a strong band-gap renormalization. Isolated single-walled carbon nanotubes (SWCNT) under high-intensity laser irradiation exhibit strong nonlinear photoluminescence (PL) due to exciton-exciton annihilation (EEA). The presence of exciton disassociation during the rapid Auger-ionization caused by EEA would lead to a strong nonlinear absorption. By simultaneously measuring SWCNT-PL and optical absorption of isolated SWCNT clusters in the PL saturation regime, we give evidence that Augerionized excitons do not disassociate but remain bound.

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Section: Time-resolved Optical Absorption Studiessupporting

confidence: 44%

Section: Time-resolved Optical Absorption Studiessupporting

confidence: 44%

Section: Time-resolved Optical Absorption Studiesmentioning

confidence: 99%

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Independence of optical absorption on Auger ionization in single-walled carbon nanotubes revealed by ultrafast e–h photodoping

et al. 2016

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“…The emission energy recovers reversibly upon reducing the power, suggesting that laser heating causes molecular desorption. 37,53,54 To avoid complications in data analysis, we keep the powers low enough to avoid such blueshifts.…”

Section: B Length Dependence Measurements and Extraction Of Diffusiomentioning

confidence: 99%

Exciton diffusion, end quenching, and exciton-exciton annihilation in individual air-suspended carbon nanotubes

2015

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Luminescence properties of carbon nanotubes are strongly affected by exciton diffusion, which plays an important role in various nonradiative decay processes. Here we perform photoluminescence microscopy on hundreds of individual air-suspended carbon nanotubes to elucidate the interplay between exciton diffusion, end quenching, and exciton-exciton annihilation processes. A model derived from random-walk theory as well as Monte Carlo simulations are utilized to analyze nanotube length dependence and excitation power dependence of emission intensity. We have obtained the values of exciton diffusion length and absorption cross section for different chiralities, and diameterdependent photoluminescence quantum yield have been observed. The simulations have also revealed the nature of a one-dimensional coalescence process, and an analytical expression for the power dependence of emission intensity is given.

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“…23 The shifting of the resonance energies indicate molecular adsorption, 14,17,25 and we thus refer to this redshifted state as the adsorbed state. Since the molecules can be thermally desorbed 17,26 we heat the samples to 400 • C in Ar gas with 3% H 2 for 20 minutes when we need to convert the nanotubes back to the pristine state.…”

mentioning

confidence: 99%

Molecular screening effects on exciton-carrier interactions in suspended carbon nanotubes

Uda

Tanaka

Kato

2018

Applied Physics Letters

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Photoluminescence spectroscopy measurements are performed on suspended carbon nanotubes in a fieldeffect configuration, and the gate voltage dependence of photoluminescence spectra are compared for the pristine and the molecularly adsorbed states of the nanotubes. We quantify the molecular screening effect on the trion binding energies by determining the energy separation between the bright exciton and the trion emission energies for the two states. The voltage dependence shows narrower voltage regions of constant photoluminescence intensity for the adsorbed states, consistent with a reduction in the electronic bandgap due to screening effects. The charge neutrality points are found to shift after molecular adsorption, which suggests changes in the nanotube chemical potential or the contact metal work function.The Coulomb interactions are enhanced in carbon nanotubes (CNTs) because of the limited screening in one-dimensional systems, 1,2 which result in stable exciton and trion formation even at room temperature. 3-6

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Photoluminescence saturation independent of excitation pathway in air-suspended single-walled carbon nanotubes

Cited by 4 publications

References 50 publications

Independence of optical absorption on Auger ionization in single-walled carbon nanotubes revealed by ultrafast e–h photodoping

Independence of optical absorption on Auger ionization in single-walled carbon nanotubes revealed by ultrafast e–h photodoping

Exciton diffusion, end quenching, and exciton-exciton annihilation in individual air-suspended carbon nanotubes

Molecular screening effects on exciton-carrier interactions in suspended carbon nanotubes

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