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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)

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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

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

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)

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  1. M.-H. Lu, J. C. Sturm, “Optimization of external coupling and light emission in organic light-emitting devices: modeling and experiment,” J. Appl. Phys. 91(2), 595–604 (2002).
  2. V. Bulović, V. B. Khalfin, G. Gu, P. E. Burrows, D. Z. Garbuzov, S. R. Forrest, “Weak microcavity effect in organic light-emitting devices,” Phys. Rev. B 58(7), 3730–3740 (1998). [CrossRef]
  3. Y.-C. Kim, S.-H. Cho, Y.-W. Song, Y.-J. Lee, Y.-H. Lee, Y.-R. Do, “Planarized SiNx/spin-on-glass photonic crystal organic light-emitting diodes,” Appl. Phys. Lett. 89(17), 173502 (2006). [CrossRef]
  4. Y. Sun, S. R. Forrest, “Enhanced light out-coupling of organic light-emitting devices using embedded low-index grids,” Nat. Photonics 2(8), 483–487 (2008). [CrossRef]
  5. J.-H. Jang, M.-C. Oh, T.-H. Yoon, J.-C. Kim, “Polymer grating imbedded organic light emitting diodes with improved out-coupling efficiency,” Appl. Phys. Lett. 97(12), 123302 (2010). [CrossRef]
  6. J.-H. Jang, M.-C. Oh, “Outcoupling enhancement of OLED with randomly distributed ITO pattern fabricated by maskless wet etching method,” J. Disp. Technol. 9(11), 900–903 (2013). [CrossRef]
  7. C. H. Lee, J.-J. Kim, “Enhanced light out-coupling of OLEDs with low haze by inserting randomly dispersed nanopillar arrays formed by lateral phase separation of polymer blends,” Small 9(22), 3858–3863 (2013). [CrossRef] [PubMed]
  8. W.-H. Koo, S.-M. Jeong, F. Araoka, K. Ishikawa, S. Nishimura, T. Toyooka, H. Takezoe, “Light extraction from organic light-emitting diodes enhanced by spontaneously formed buckles,” Nat. Photonics 4(4), 222–226 (2010). [CrossRef]
  9. A. Chutinan, K. Ishihara, T. Asano, M. Fujita, S. Noda, “Theoretical analysis on light-extraction efficiency of organic light-emitting diodes using FDTD and mode-expansion methods,” Org. Electron. 6(1), 3–9 (2005). [CrossRef]
  10. Y.-R. Do, Y.-C. Kim, Y.-W. Song, C.-O. Cho, H.-S. Jeon, Y.-J. Lee, S.-H. Kim, Y.-H. Lee, “Enhanced light extraction from organic light-emitting diodes with 2D SiO2/SiNx photonic crystals,” Adv. Mater. 15(14), 1214–1218 (2003). [CrossRef]
  11. A. O. Altun, S.-H. Jeon, J.-Y. Shim, J.-H. Jeong, D.-G. Choi, K.-D. Kim, J.-H. Choi, S.-W. Lee, E.-S. Lee, H.-D. Park, J. R. Youn, J.-J. Kim, Y.-H. Lee, J.-W. Kang, “Corrugated organic light emitting diodes for enhanced light extraction,” Org. Electron. 11(5), 711–716 (2010). [CrossRef]
  12. X.-L. Zhang, J. Feng, J.-F. Song, X.-B. Li, H.-B. Sun, “Grating amplitude effect on electroluminescence enhancement of corrugated organic light-emitting devices,” Opt. Lett. 36(19), 3915–3917 (2011). [CrossRef] [PubMed]
  13. W. J. Choi, Q.-H. Park, D.-H. Kim, H.-S. Jeon, C.-S. Sone, Y.-J. Park, “FDTD simulation for light extraction in a GaN-based LED,” J. Korean Phys. Soc. 49(3), 877–880 (2006).
  14. A. Aziz, K. L. Narasimhan, “Subband gap optical absorption and defects in Tris(8 hydroxy quinolato) aluminium,” Synth. Met. 131(1–3), 71–77 (2002). [CrossRef]
  15. J. M. Bennett, “Precise Method for Measuring the Absolute Phase Change on Reflection,” J. Opt. Soc. Am. 54(5), 612–624 (1964). [CrossRef]
  16. D.-H. Cho, J.-W. Shin, S.-K. Park, J.-H. Moon, B.-J. Lee, N.-S. Cho, J.-H. Han, J.-W. Huh, C.-W. Joo, J.-H. Hwang, H.-Y. Chu, and J.-I. Lee, “Light extraction for white OLEDs by nano-structures and high refractive index layer,” in Digest of Technical Papers of the 12th International Meeting on Information Display (IMID, Daegu, Korea, 2012), 182–183.
  17. C.-I. Yeo, Y.-M. Song, S.-J. Jang, Y.-T. Lee, “Wafer-scale broadband antireflective silicon fabricated by metal-assisted chemical etching using spin-coating Ag ink,” Opt. Express 19(S5Suppl 5), A1109–A1116 (2011). [CrossRef] [PubMed]
  18. Y. Hu, X. Diao, C. Wang, W. Hao, T. Wang, “Effects of heat treatment on properties of ITO films prepared by rf magnetron sputtering,” Vacuum 75(2), 183–188 (2004). [CrossRef]
  19. Y.-S. Jung, Y.-W. Choi, H.-C. Lee, D.-W. Lee, “Effects of thermal treatment on the electrical and optical properties of silver-based indium tin oxide/metal/indium tin oxide structures,” Thin Solid Films 440(1–2), 278–284 (2003). [CrossRef]

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