2. OLED Display Structure

  1. Takatoshi Tsujimura

Published Online: 2 APR 2012

DOI: 10.1002/9781118173053.ch2

OLED Displays: Fundamentals and Applications

OLED Displays: Fundamentals and Applications

How to Cite

Tsujimura, T. (2012) OLED Display Structure, in OLED Displays: Fundamentals and Applications, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9781118173053.ch2

Publication History

  1. Published Online: 2 APR 2012
  2. Published Print: 22 JUN 2012

Book Series:

  1. Wiley-SID Series in Display Technology

Book Series Editors:

  1. Anthony C. Lowe

ISBN Information

Print ISBN: 9781118140512

Online ISBN: 9781118173053

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Keywords:

  • delayed fluorescence emission;
  • organic light-emitting diode (OLED);
  • Richardson effect;
  • thermionic emission

Summary

Emission from all organic light-emitting diode (OLED) devices-whether of the small-molecular or polymer family-can be explained by the same principle. The wavelength of this light emission corresponds to the exciton energy, so it is possible to control the color of the emission by adjusting the molecular design of the color center. OLED devices could emit very dim light before these developments, but high-luminance operation was achieved only after the first OLED paper. The electrons require sufficient energy to cross the potential barrier to exit the electrode surface. When the temperature is increased, electrons possessing sufficient kinetic energy can reach and then exit the surface. This phenomenon is called thermionic emission or the Richardson effect . The emission obtained with this mechanism yields an emission that is slower than normal fluorescence OLED emission, so it is sometimes called delayed fluorescence emission .

Controlled Vocabulary Terms

fluorescence; organic light emitting diodes; thermionic conversion