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Perovskite Light-Emitting Diodes with Improved Outcoupling Using a High-Index Contrast Nanoarray.

Sohee Jeon1, Lianfeng Zhao2, Young-Jin Jung3

  • 1Nano-Convergence Mechanical Research Division, Korea Institute of Machinery and Materials (KIMM), Yuseong-gu, Daejeon, 34103, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|February 1, 2019
PubMed
Summary

Researchers developed a nanohole array to improve light extraction in perovskite light-emitting diodes (PeLEDs). This strategy boosts outcoupling efficiency, enhancing PeLED performance for next-generation optoelectronics.

Keywords:
high-index contrastnanoarraysoutcouplingperovskite light-emitting diodes

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Organic-inorganic hybrid perovskite light-emitting diodes (PeLEDs) show promise for advanced optoelectronic applications.
  • High refractive index of perovskite layers causes significant optical losses (>70%) in PeLEDs, limiting external quantum efficiency (EQE).
  • Current PeLED EQE, though exceeding 20%, requires further enhancement to match other LED technologies.

Purpose of the Study:

  • To investigate the effectiveness of a nanohole array in enhancing light outcoupling efficiency in PeLEDs.
  • To address optical losses caused by the high refractive index of perovskite materials.
  • To improve the overall performance of red/near-infrared PeLEDs.

Main Methods:

  • Fabrication of a randomly distributed nanohole array with high-index contrast on the perovskite emissive layer.
  • Comprehensive optical analysis of the perovskite thin film and the nanohole outcoupling structure.
  • Characterization of red/near-infrared PeLEDs incorporating the nanohole array.

Main Results:

  • The nanohole array effectively redirects light into the substrate, significantly improving light outcoupling.
  • A 1.64 times increase in light extraction was achieved due to the nanohole array.
  • Highly efficient red/near-infrared PeLEDs demonstrated a peak external quantum efficiency (EQE) of 14.6%.

Conclusions:

  • Randomly distributed nanohole arrays are an effective strategy for enhancing outcoupling efficiency in PeLEDs.
  • This approach mitigates optical losses associated with high refractive index perovskite layers.
  • The developed nanohole structure enables the fabrication of highly efficient PeLEDs for optoelectronic applications.