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Related Experiment Video

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Spontaneously Embedded Scattering Structures in a Flexible Substrate for Light Extraction.

Seungo Gim1, Illhwan Lee1, Jae Yong Park1

  • 1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Gyeongbuk-do, Pohang-si, 37673, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|May 3, 2017
PubMed
Summary

A novel flexible hazy substrate with embedded air bubbles significantly boosts organic light-emitting diode (OLED) efficiency. This innovation enhances light extraction, improving power efficiency by up to 91% with an external layer.

Keywords:
OLEDsflexible substrateslight extractionsolid-state lighting

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Organic light-emitting diodes (OLEDs) suffer from limited light extraction efficiency due to internal light trapping.
  • Enhancing light extraction is crucial for improving the performance and power efficiency of OLED devices.

Purpose of the Study:

  • To develop a flexible hazy substrate (FHS) with embedded air bubbles to increase light extraction efficiency in OLEDs.
  • To investigate the effect of FHS on OLED power efficiency and mechanical flexibility.

Main Methods:

  • Fabrication of micropatterned substrates using plasma treatment.
  • Embedding air bubbles by coating a planarization layer onto micropatterned substrates.
  • Characterization of FHS properties including haze, transmittance, and surface roughness.
  • Optical simulations (RCWA, FDTD) to analyze light extraction mechanisms.
  • Integration of FHS into OLED devices to measure power efficiency improvements.
  • Mechanical testing to evaluate flexibility and durability.

Main Results:

  • Controlled haze from 1.7% to 68.4% by adjusting plasma treatment time.
  • Achieved FHS with 68.4% haze, 90.3% transmittance, and 1.2 nm surface roughness.
  • Demonstrated effective photon extraction from trapped states within the substrate via simulations.
  • Increased OLED power efficiency by 22% using FHS alone.
  • Achieved a further 91% increase in power efficiency when combined with an external extraction layer.
  • Confirmed excellent mechanical flexibility with no defects after 10,000 bending cycles (4 mm radius).

Conclusions:

  • The developed flexible hazy substrate effectively enhances light extraction in OLEDs through embedded air bubbles.
  • The FHS offers significant improvements in OLED power efficiency and maintains excellent mechanical flexibility.
  • This technology presents a promising approach for next-generation flexible and efficient OLED displays.