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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
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Vacuum nanohole array embedded phosphorescent organic light emitting diodes.

Sohee Jeon1, Jeong-Hwan Lee2, Jun-Ho Jeong3

  • 11] Research Institute of Advanced Materials (RIAM), Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea [2] Department of Nano Manufacturing Technology, Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon, 305-343, Korea.

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|March 4, 2015
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Summary

Researchers achieved over 50% external quantum efficiency (EQE) in phosphorescent organic light-emitting diodes (PhOLEDs) by incorporating a vacuum nanohole array (VNHA). This breakthrough significantly enhances light extraction, setting a new record for bottom-emitting OLEDs.

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Area of Science:

  • Optoelectronics
  • Materials Science

Background:

  • Phosphorescent organic light-emitting diodes (PhOLEDs) achieve 100% internal quantum efficiency but are limited by low external quantum efficiency (EQE), typically around 30%, due to light outcoupling losses.
  • Improving light extraction is crucial for advancing OLED technology and reducing energy consumption.

Purpose of the Study:

  • To significantly enhance the external quantum efficiency (EQE) of phosphorescent organic light-emitting diodes (PhOLEDs).
  • To investigate the effectiveness of a vacuum nanohole array (VNHA) in improving light extraction in PhOLEDs.
  • To achieve record-breaking EQE values for bottom-emitting OLED devices.

Main Methods:

  • Fabrication of PhOLEDs incorporating a vacuum nanohole array (VNHA).
  • Experimental measurement of EQE for the fabricated devices.
  • Optical modeling analysis to quantify light extraction enhancement and waveguide loss recovery.
  • Comparison of experimental data with optical modeling results.

Main Results:

  • Achieved an external quantum efficiency (EQE) greater than 50% in PhOLEDs with VNHA.
  • Demonstrated significantly reduced roll-off in EQE at high brightness.
  • Optical modeling confirmed that the VNHA effectively extracts the entire waveguide loss into the air.
  • The obtained EQE represents the highest value reported to date for bottom-emitting OLEDs.

Conclusions:

  • Insertion of a VNHA is a highly effective strategy for overcoming light extraction limitations in PhOLEDs.
  • The VNHA technology enables a substantial increase in EQE, surpassing previous records for bottom-emitting devices.
  • This advancement paves the way for more efficient and brighter OLED displays and lighting applications.