Bright Infrared Emission from Electrically Induced Excitons in Carbon Nanotubes

@article{Chen2005BrightIE,
  title={Bright Infrared Emission from Electrically Induced Excitons in Carbon Nanotubes},
  author={Jia Chen and Vasili Perebeinos and M. Freitag and James C. Tsang and Qiang Fu and Jie Liu and Phaedon Avouris},
  journal={Science},
  year={2005},
  volume={310},
  pages={1171 - 1174}
}
We used the high local electric fields at the junction between the suspended and supported parts of a single carbon nanotube molecule to produce unusually bright infrared emission under unipolar operation. Carriers were accelerated by band-bending at the suspension interface, and they created excitons that radiatively recombined. This excitation mechanism is ∼1000 times more efficient than recombination of independently injected electrons and holes, and it results from weak electron-phonon… 
Exciton formation and annihilation during 1D impact excitation of carbon nanotubes.
TLDR
Near-infrared electroluminescence was recorded from unipolar single-wall carbon nanotube field-effect transistors at high drain-source voltages, and resonant light emission originating from the radiative relaxation of excitons rather than heat dissipation is revealed.
Electrically driven light emission from hot single-walled carbon nanotubes at various temperatures and ambient pressures
Electroluminescence of individual single-walled carbon nanotubes down to ∼15K is measured. We observe electrically driven light emission from suspended quasimetallic nanotubes in vacuum down to ∼15K
Efficient narrow-band light emission from a single carbon nanotube p-n diode.
TLDR
A new level of control over electrical carrier injection is achieved, reducing power dissipation by a factor of up to 1,000, and resulting in zero threshold current, negligible self-heating and high carrier-to-photon conversion efficiencies.
Impact Excitation by Hot Carriers in Carbon Nanotubes
phonon excitation and a simple scaling of the rate with the field strength and optical phonon temperature is obtained. The excellent electrical properties and direct gap of carbon nanotubes (CNTs)
Electrically driven thermal light emission from individual single-walled carbon nanotubes.
TLDR
It is shown that, under low bias voltages, a suspended quasi-metallic SWNT (QM-SWNT) emits light owing to Joule heating, displaying strong peaks in the visible and infrared, corresponding to interband transitions.
Direct probe of excitonic and continuum transitions in the photocurrent spectroscopy of individual carbon nanotube p-n diodes
The authors show that a carbon nanotube p-n diode is a very sensitive probe of optical transitions in individual single-walled carbon nanotubes. In the photocurrent spectra, an alternating sequence
Avalanche Photoemission in Suspended Carbon Nanotubes: Light without Heat
We observe bright electroluminescence from suspended carbon nanotube (CNT) field effect transistors (FETs) under extremely low applied electrical powers (∼nW). Here, light emission occurs under
Extremely Efficient Multiple Electron-Hole Pair Generation in Carbon Nanotube Photodiodes
TLDR
Spatially and spectrally resolved photocurrent combined with temperature-dependent studies suggest that these steps result from efficient generation of multiple electron-hole pairs from a single hot E22 carrier, which is both of fundamental interest and relevant for applications in future ultra-efficient photovoltaic devices.
Carbon nanotube photo- and electroluminescence in longitudinal electric fields.
TLDR
A combination of screening and heating of the carbon nanotube can explain both spectral shift and broadening of the electrically induced light emission.
Electroluminescence and thermal radiation from metallic armchair carbon nanotubes with defects
Bias-induced light emission and thermal radiation from conducting channels of carbon nanotubes (CNTs) with defects are studied theoretically within the framework of nonequilibrium Green’s function
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 33 REFERENCES
Electrically Induced Optical Emission from a Carbon Nanotube FET
TLDR
Electrical measurements show that the observed optical emission originates from radiative recombination of electrons and holes that are simultaneously injected into the undoped nanotubes, consistent with a nanotube FET model in which thin Schottky barriers form at the source and drain contacts.
Hot Carrier Electroluminescence from a Single Carbon Nanotube
We measure the spectrum and efficiency of the infrared light emission from ambipolar carbon nanotube field-effect transistors. The width of the emission peak is strongly device-structure dependent.
Mobile ambipolar domain in carbon-nanotube infrared emitters.
TLDR
The spatially resolved infrared light emission from ambipolar carbon-nanotube field-effect transistors with long-channel lengths provides valuable insight into the transistor behavior, complementary to electronic device characteristics.
The Optical Resonances in Carbon Nanotubes Arise from Excitons
TLDR
Two-photon excitation spectroscopy bolsters the exciton picture and demonstrates the dominant role of many-body interactions in the excited-state properties of one-dimensional systems.
Bright band gap photoluminescence from unprocessed single-walled carbon nanotubes.
TLDR
A strong enhancement of photoluminescence intensity is observed when the excitation wavelength is resonant with the second Van Hove singularity, unambiguously confirming the origin of the photol Luminescence.
Single carbon nanotubes probed by photoluminescence excitation spectroscopy: the role of phonon-assisted transitions.
TLDR
Observations indicate very strong electron-phonon coupling that allows efficient excitation of electronic states via phonon-assisted processes and leads to ultrafast intraband relaxation due to inelastic electron- phonon scattering.
Stability of high-density one-dimensional excitons in carbon nanotubes under high laser excitation.
TLDR
It is found that the presence of lowest- subband excitons broadens all absorption peaks, including those in the second-subband range, which provides a consistent explanation for the complex spectral dependence of pump-probe signals reported for SWNTs.
Excitonic effects and optical spectra of single-walled carbon nanotubes.
TLDR
Calculations based on an ab initio many-electron Green's function approach of electron-hole interaction effects on the optical spectra of small-diameter single-walled carbon nanotubes explain the discrepancies between previous theories and experiments.
Electronic structure and dynamics of optically excited single-wall carbon nanotubes
We have studied the electronic structure and charge-carrier dynamics of individual single-wall carbon nanotubes (SWNTs) and nanotube ropes using optical and electron–spectroscopic techniques. The
Excitons in Carbon Nanotubes
Exciton energy levels and corresponding optical spectra are calculated in carbon nanotubes (CN) in the conventional screened Hartree-Fock approximation within a k · p scheme. The Coulomb interaction
...
1
2
3
4
...