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Optical Engineering

Using holography to increase the light output efficiency of an organic light-emitting diode—angular, wavelength, and near-field effects
Author(s): Hua-Kuang Liu; Han-Tsung Hsueh; Chen Chang
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Paper Abstract

The authors propose the use of holograms to modify both sides of the substrate of an organic light-emitting diode (OLED) to increase its light output efficiency and to discuss the associated angular, spectral, and near-field effects. A single-source macroscopic phase hologram experiment is used to illustrate the idea. Since the emitted light originates from dynamically varying positions with different directions and has wavelengths longer than the nanometer layer thickness of an OLED, the angular, wavelength, and near-field effects have been analyzed. Diffraction efficiency due to the dynamic density and position variations of the excitons has been discussed. The subwavelength near-field wave propagation effect is described with finite-difference time domain solutions to Maxwell's equations. These effects are not limited to the holographic method, but should exist in other substrate-modification methods proposed for increasing the OLED's external light efficiency.

Paper Details

Date Published: 1 November 2005
PDF: 9 pages
Opt. Eng. 44(11) 111306 doi: 10.1117/1.2128407
Published in: Optical Engineering Volume 44, Issue 11
Show Author Affiliations
Hua-Kuang Liu
Han-Tsung Hsueh, National Taiwan Univ. (Taiwan)
Chen Chang, Yuan-Ze Univ. (Taiwan)

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