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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence: Fluorescence and Phosphorescence01:23

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Electroluminescence from Single-Walled Carbon Nanotubes with Quantum Defects.

Min-Ken Li1,2, Adnan Riaz2,3, Martina Wederhake4

  • 1Institute of Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.

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|June 22, 2022
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Summary

Defect-engineered single-walled carbon nanotubes exhibit tunable electroluminescence. Functionalization and electrostatic gating control these emissions, enabling highly pure light generation from these novel photon sources.

Keywords:
carbon nanotubesdefectsdopingelectroluminescenceexcitonsgraphenephotoluminescence

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Single-walled carbon nanotubes (SWCNTs) with covalent sidewall defects are tunable photon sources.
  • Their optical properties depend on chirality and functionalization.

Purpose of the Study:

  • To investigate electroluminescence (EL) from functionalized SWCNTs.
  • To correlate EL with electrical transport and photoluminescence (PL).
  • To demonstrate gate-controlled, defect-induced emissions.

Main Methods:

  • Fabrication of single-tube devices using functionalized (7, 5) and (6, 5) SWCNTs with graphene electrodes.
  • Electroluminescence spectroscopy and excitation mapping.
  • Electrical transport measurements.
  • Photoluminescence spectroscopy of pristine and functionalized nanotubes.

Main Results:

  • Electrically generated, defect-induced emissions were observed and controllable by electrostatic gating.
  • Emissions were strongly red-shifted compared to pristine nanotubes.
  • Excitonic and trionic recombination processes were identified.
  • Gate-dependent emission lines at cryogenic conditions were assigned to phonon-assisted hot-exciton EL.
  • High spectral purity was achieved through gate control of defect-state emission.

Conclusions:

  • Electroluminescence excitation selectively targets neutral defect states with low transition energy.
  • Gate control allows differentiation between neutral and charged defect emissions.
  • Functionalized SWCNTs offer a pathway to highly pure, tunable light sources.