Abstract

Based on the rigorous electromagnetic wave theory, a numerical model for simulating the radiation characteristics of organic light-emitting devices (OLEDs) is developed. In particular, a novel method for overcoming the numerical difficulty in taking the thick glass substrate into account is proposed. The numerical results confirm the importance of the effects of the thick glass substrate. The algorithms based on the numerical model are then used for evaluating the dependencies of OLED radiation characteristics on various parameters, including the thickness of different device layers and the cathode metal variety. In the study of the effect of emission layer (EML) thickness, it is found that the radiation spectral peak red shifts with increasing EML thickness. This trend is consistent with the experimental result.

© 2006 IEEE

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Other (20)

C. W. Tang and S. A. VanSlyke, "Organic electroluminescent diodes", Appl. Phys. Lett., vol. 51, no. 12, pp. 913-915, Sep. 1987.

C. W. Tang, S. A. VanSlyke and C. H. Chen, "Electroluminescence of doped organic thin films", J. Appl. Phys., vol. 65, no. 9, pp. 3610-3616, May 1989.

X. Jiang, P. Herguth, T. Sassa and A. K-Y. Jen, "Efficient green polymer light-emitting diodes with microcavity effect in electroluminescence spectrum but constant quantum efficiency", J. Appl. Phys., vol. 96, no. 6, pp. 3553-3555, Sep. 2004.

B. D. Chin, M. C. Suh, S. T. Lee and H. K. Chung, "Improved blue light-emitting polymeric device by the tuning of drift mobility and charge balance", Appl. Phys. Lett., vol. 84, no. 10, pp. 1777-1779, Mar. 2004.

K. B. Kahen, "Rigorous optical modeling of multilayer organic light-emitting diode devices", Appl. Phys. Lett., vol. 78, no. 12, pp. 1649-1651, Mar. 2001.

J. Rostalski and D. Meissner, "Photocurrent spectroscopy for the investigation of charge carrier generation and transport mechanisms in organic p/n-junction solar cells", Sol. Energy Mater. Sol. Cells, vol. 63, no. 1, pp. 37-47, Jun. 2000.

P. Peumans, A. Yakimov and S. R. Forrest, "Small molecular weight organic thin-film photodetectors and solar cells", J. Appl. Phys., vol. 93, no. 7, pp. 3693-3723, Apr. 2003.

H. Riel, S. Karg, T. Beierlein, W. Rieß and K. Neyts, "Tuning the emission characteristics of top-emitting organic light-emitting devices by means of a dielectric capping layer: An experimental and theoretical study", J. Appl. Phys., vol. 94, no. 8, pp. 5290-5296, Oct. 2003.

C. C. Wu, C. L. Lin, P. Y. Hsieh and H. H. Chiang, "Methodology for optimizing viewing characteristics of top-emitting organic light-emitting devices", Appl. Phys. Lett., vol. 84, no. 20, pp. 3966-3968, May 2004.

L. M. Brekhovskikh, Waves in Layered Media, New York: Academic, 1960.

J. R. Wait, Electromagnetic Waves in Stratified Media, Oxford: U.K.: Pergamon, 1962.

S. R. J. Brueck, "Radiation from a dipole embedded in a dielectric slab", IEEE J. Sel. Topics Quantum Electron., vol. 6, no. 6, pp. 899-910, Nov./Dec. 2000.

A. Ishimaru, Electromagnetic Wave Propagation, Radiation, and Scattering, Englewood Cliffs, NJ: Prentice-Hall, 1991.

G. Gu, D. Z. Garbuzov, P. E. Burrows, S. Venkdtesh and S. R. Forrest, "High-external-quantum-efficiency organic light-emitting devices", Opt. Lett., vol. 22, no. 6, pp. 396-398, Mar. 1997.

E. D. Palik, Ed. Handbook of Optical Constants of Solids, New York: Academic, 1985.

Y. Fukuda, T. Watanabe, T. Wakimoto, S. Miyaguchi and M. Tsuchida, "An organic LED display exhibiting pure RGB colors", Synth. Met., vol. 111/112, pp. 1-6, Sep. 2000.

S. K. So, W. K. Choi, L. M. Leung and K. Neyts, "Interference effects in bilayer organic light-emitting diodes", Appl. Phys. Lett., vol. 74, no. 14, pp. 1939-1941, Apr. 1999.

S. Han, C. Huang and Z. H. Lu, "Color tunable metal-cavity organic light-emitting diodes with fullerene layer", J. Appl. Phys., vol. 97, no. 9, p. 093102, Apr. 2005.

P. A. Hobson, J. A. E. Wasey, I. Sage and W. L. Barnes, "The role of surface plasmons in organic light-emitting diodes", IEEE J. Sel. Topics Quantum Electron., vol. 8, no. 2, pp. 378-386, Mar./Apr. 2002.

Y. R. Do, Y.C. Kim, Y. W. Song and Y. H. Lee, "Enhanced light extraction efficiency from organic light emitting diodes by insertion of a two-dimensional photonic crystal structure", J. Appl. Phys., vol. 96, no. 12, pp. 7629-7636, Dec. 2004.

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