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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
07:44

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Published on: November 16, 2018

White organic light-emitting diodes for emotion solid-state lighting.

Ji Hoon Seo1, Seok Jae Lee, Ja Ryong Koo

  • 1Department of Information Display, Hongik University, Seoul 121-791, Korea.

Journal of Nanoscience and Nanotechnology
|August 3, 2012
PubMed
Summary

Researchers developed white organic light-emitting diodes for emotion solid-state lighting (ESSL). These diodes utilize a hole modulating layer (HML) and mixed spacer (MS) to balance charge carriers, achieving tunable warm to cold white light emissions.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Solid-State Lighting

Background:

  • Organic light-emitting diodes (OLEDs) are crucial for advanced lighting applications.
  • Achieving stable and tunable white light emission in OLEDs remains a key challenge.
  • Emotion Solid-State Lighting (ESSL) requires efficient and spectrally controllable white light sources.

Purpose of the Study:

  • To demonstrate white OLEDs for ESSL applications.
  • To investigate the use of specific organic materials as hole modulating layers (HML) and mixed spacers (MS).
  • To achieve tunable white light emission with varying chromaticities.

Main Methods:

  • Fabrication of white OLED devices incorporating novel HML and MS materials.
  • Utilizing N,N -diphenyl-N,N -bis-[4-(phenyl-m-tolyl-amino)-phenyl]-biphenyl-4,4 -diamine and N,N -bis-(1-naphyl)-N,N -diphenyl-1,1 -biphenyl-4,4 -diamine as HML.
  • Employing 4,4 ',4 "-tris(N-carbazolyl)-triphenylamine and {9,9-dimethyl-7-[10-(naphthalen-2-yl)anthracen-9-yl]-9H-fluoren-2-yl}triphenylsilane as MS to unbalance holes and electrons.

Main Results:

  • Successful demonstration of white OLEDs for ESSL.
  • Achieved a range of white light chromaticities, from warm white (CIE coordinates: 0.46, 0.42) to cold white (CIE coordinates: 0.29, 0.36).
  • The HML and MS effectively controlled the balance of holes and electrons within the device.

Conclusions:

  • The developed white OLEDs are suitable for ESSL applications.
  • The strategic use of HML and MS enables precise control over white light emission characteristics.
  • This work presents a viable approach for creating tunable white solid-state lighting using organic materials.