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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 1 — Jan. 13, 2014
  • pp: 498–507

FDTD analysis of the light extraction efficiency of OLEDs with a random scattering layer

Jun-Whee Kim, Ji-Hyang Jang, Min-Cheol Oh, Jin-Wook Shin, Doo-Hee Cho, Jae-Hyun Moon, and Jeong-Ik Lee  »View Author Affiliations


Optics Express, Vol. 22, Issue 1, pp. 498-507 (2014)
http://dx.doi.org/10.1364/OE.22.000498


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Abstract

The light extraction efficiency of OLEDs with a nano-sized random scattering layer (RSL-OLEDs) was analyzed using the Finite Difference Time Domain (FDTD) method. In contrast to periodic diffraction patterns, the presence of an RSL suppresses the spectral shift with respect to the viewing angle. For FDTD simulation of RSL-OLEDs, a planar light source with a certain spatial and temporal coherence was incorporated, and the light extraction efficiency with respect to the fill factor of the RSL and the absorption coefficient of the material was investigated. The design results were compared to the experimental results of the RSL-OLEDs in order to confirm the usefulness of FDTD in predicting experimental results. According to our FDTD simulations, the light confined within the ITO-organic waveguide was quickly absorbed, and the absorption coefficients of ITO and RSL materials should be reduced in order to obtain significant improvement in the external quantum efficiency (EQE). When the extinction coefficient of ITO was 0.01, the EQE in the RSL-OLED was simulated to be enhanced by a factor of 1.8.

© 2014 Optical Society of America

OCIS Codes
(160.4890) Materials : Organic materials
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.3670) Optical devices : Light-emitting diodes
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optical Devices

History
Original Manuscript: September 24, 2013
Revised Manuscript: November 25, 2013
Manuscript Accepted: December 2, 2013
Published: January 3, 2014

Citation
Jun-Whee Kim, Ji-Hyang Jang, Min-Cheol Oh, Jin-Wook Shin, Doo-Hee Cho, Jae-Hyun Moon, and Jeong-Ik Lee, "FDTD analysis of the light extraction efficiency of OLEDs with a random scattering layer," Opt. Express 22, 498-507 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-1-498


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