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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

463
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...
463

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Synthesis of Core-shell Lanthanide-doped Upconversion Nanocrystals for Cellular Applications
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Core-Shell Nanorods as Ultraviolet Light-Emitting Diodes.

Douglas Cameron1, Pierre-Marie Coulon2,3, Simon Fairclough4

  • 1Department of Physics, Scottish Universities Physics Alliance (SUPA), University of Strathclyde, Glasgow G4 0NG, United Kingdom.

Nano Letters
|February 7, 2023
PubMed
Summary

Researchers developed a novel nanostructuring method for efficient deep ultraviolet (UV) light-emitting diodes (LEDs). This approach overcomes traditional barriers, paving the way for advanced UV LED technology using aluminum gallium nitride (AlGaN) nanorods.

Keywords:
AlGaNUV LEDcore−shellelectron microscopynanowiresemiconductor

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Deep ultraviolet (UV) light-emitting diodes (LEDs) face efficiency challenges due to conventional planar growth limitations.
  • Three-dimensional nanostructuring, specifically nanorods, offers potential improvements in doping, dislocation density, light extraction, and quantum effects.

Purpose of the Study:

  • To demonstrate a hybrid fabrication method for uniform aluminum gallium nitride (AlGaN) core-shell nanorods on sapphire.
  • To create a GaN-free design for deep-UV LEDs to prevent self-absorption and maintain electrical function.

Main Methods:

  • A hybrid top-down/bottom-up approach was employed for nanorod fabrication, scalable to wafer levels.
  • Nanoprobing and time-resolved cathodoluminescence were used to characterize the electrical and optical properties of the nanorods.

Main Results:

  • Highly uniform AlGaN core-shell nanorods were successfully fabricated using a GaN-free design.
  • Electrical characterization revealed low turn-on voltages, strong rectification, and significant electron-beam-induced currents.
  • Optical measurements indicated short carrier lifetimes, consistent with reduced polarization fields.

Conclusions:

  • Nanostructuring, particularly using AlGaN core-shell nanorods, is a viable strategy for overcoming barriers in efficient deep-UV LED development.
  • The demonstrated fabrication method is compatible with commercial manufacturing processes.