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Related Concept Videos

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.
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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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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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All-Quantum-Dot Infrared Light-Emitting Diodes.

Zhenyu Yang1, Oleksandr Voznyy1, Mengxia Liu1

  • 1The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto , 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

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|November 18, 2015
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Summary
This summary is machine-generated.

Colloidal quantum dot (CQD) infrared light-emitting diodes (LEDs) now utilize quantum-tuned CQDs for all layers. This breakthrough enables tunable emission from 1220-1622 nm with high efficiency and low voltage.

Keywords:
carrier transport layerscolloidal quantum dotsinfrared light emissionlight-emitting diodes

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Colloidal quantum dots (CQDs) are explored for infrared electroluminescent devices.
  • Existing CQD light-emitting diodes (LEDs) use organic or inorganic oxide transport layers.
  • A need exists for improved CQD-based infrared LEDs with tunable emission and high performance.

Purpose of the Study:

  • To develop novel infrared LEDs using quantum-tuned colloidal quantum dots for all functional layers.
  • To demonstrate tunable emission wavelengths by precisely controlling the bandgap and band position of CQD components.
  • To achieve high external quantum efficiency and low turn-on voltage in all-inorganic CQD LEDs.

Main Methods:

  • Fabrication of infrared LEDs utilizing quantum-tuned CQDs for hole-transporting, electron-transporting, and light-emitting layers.
  • Bandgap and band position engineering of CQD materials.
  • Characterization of electroluminescent properties, including emission wavelength, external quantum efficiency, and turn-on voltage.

Main Results:

  • Successfully fabricated infrared LEDs with tunable emission spanning 1220 to 1622 nm.
  • Achieved peak external quantum efficiency of 1.6% for devices emitting at 1350 nm.
  • Demonstrated a low turn-on voltage of 1.2 V for devices emitting at 1350 nm.
  • Outperformed previously reported all-inorganic CQD LEDs in terms of efficiency and performance.

Conclusions:

  • Quantum-tuned CQDs can be effectively used for all layers in infrared LEDs, including transport layers.
  • This approach allows for precise tuning of emission wavelengths across the infrared spectrum.
  • The developed all-inorganic CQD LEDs represent a significant advancement, offering high efficiency and low operating voltage for infrared emission.