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Flexible and Stretchable UV-B Light-Emitting Diodes.

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Researchers developed the first flexible ultraviolet-B (UV-B) light-emitting diode membranes using gallium nitride (GaN) microwires. These elastic UV-B devices offer stable performance under stretching and bending for diverse applications.

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III−V semiconductorsPDMSUV‐B light‐emitting diodescarbon nanotubeselastic electronics

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid State Physics

Background:

  • Nanostructured ultraviolet light sources are crucial for applications in dermatology, horticulture, and disinfection.
  • Existing UV-B (280-325 nm) sources often lack the flexibility required for advanced applications like wearable optoelectronics.

Purpose of the Study:

  • To develop the first elastic UV-B light-emitting diode (LED) membranes.
  • To address challenges in optical efficiency and mechanical flexibility for UV-B sources.

Main Methods:

  • Fabrication of gallium nitride (GaN) microwires with an aluminum gallium nitride/gallium nitride (AlGaN/GaN) core-shell structure.
  • Encapsulation of microwires in polydimethylsiloxane (PDMS) and integration with elastic electrodes made from single-walled carbon nanotubes (SWCNTs) or silver nanowires.
  • Characterization of electrode resistivity under biaxial stretching and LED performance under mechanical strain.

Main Results:

  • SWCNT-based elastic electrodes maintained initial resistivity at 10% biaxial stretching.
  • The elastic UV-B LEDs emitted at 307-321 nm with a current density of ~3.9 A/cm² at 18 V.
  • Devices demonstrated stable functionality, minimal spectral shift (<3 nm), and consistent I-V characteristics under bending and 10% stretching.

Conclusions:

  • The developed GaN microwire-based elastic membranes represent a significant advancement in UV-B light source technology.
  • These flexible UV-B LEDs are suitable for integration into wearable optoelectronics and other applications requiring mechanical adaptability.