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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Isotropic quantum dot LEDs approach theoretical external quantum efficiency (EQE) limits.
  • Anisotropic nanorods offer potential for higher EQE due to directional emission.
  • CdSe/CdS nanorods (NRs) face challenges like low quantum yield and unbalanced charge injection.

Purpose of the Study:

  • To overcome limitations in CdSe/CdS nanorod (NR) based LEDs.
  • To enhance photoluminescence quantum yield (PLQY) and charge injection balance.
  • To achieve high brightness and EQE in nanorod LEDs.

Main Methods:

  • Modified seeded growth method to produce anisotropic nanorods.
  • Coating spherical CdSe seeds with a gradient alloyed CdZnSe shell.
  • Applying a subsequent rod-shaped CdZnS/ZnS shell.

Main Results:

  • Achieved nanorods with photoluminescence quantum yield (PLQY) up to 98%.
  • Developed an intermediate alloyed CdZnSe shell to suppress electron delocalization.
  • Reduced hole-injection barrier and increased electron-injection barrier for balanced charge injection.
  • Demonstrated LEDs with high brightness (160341 cd m⁻²) and EQE of 22%.

Conclusions:

  • The novel shell structure effectively enhances charge injection balance and suppresses electron delocalization.
  • The developed nanorods represent a significant advancement for high-performance light-emitting diodes (LEDs).
  • Achieved record high brightness and EQE for nanorod-based LEDs.