Special Section on Organic Light-Emitting Materials and Devices

Simulations of emission from microcavity tandem organic light-emitting diodes

[+] Author Affiliations
Rana Biswas, Chun Xu

Iowa State University, Department of Physics & Astronomy, Ames Laboratory, Ames, Iowa 50011

Iowa State University, Microelectronics Research Center, Department of Electrical and Computer Engineering, Ames, Iowa 50011

Weijun Zhao, Ruth Shinar

Iowa State University, Microelectronics Research Center, Department of Electrical and Computer Engineering, Ames, Iowa 50011

Rui Liu, Joseph Shinar

Iowa State University, Department of Physics & Astronomy, Ames Laboratory, Ames, Iowa 50011

J. Photon. Energy. 1(1), 011016 (March 14, 2011). doi:10.1117/1.3552947
History: Received August 15, 2010; Revised December 24, 2010; Accepted January 10, 2011; Published March 14, 2011; Online March 14, 2011
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Microcavity tandem organic light-emitting diodes (OLEDs) are simulated and compared to experimental results. The simulations are based on two complementary techniques: rigorous finite element solutions of Maxwell's equations and Fourier space scattering matrix solutions. A narrowing and blue shift of the emission spectrum relative to the noncavity single unit OLED is obtained both theoretically and experimentally. In the simulations, a distribution of emitting sources is placed near the interface of the electron transport layer tris(8-hydroxyquinoline) Al (Alq3) and the hole transport layer (N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine (α-NPB). Far-field electric field intensities are simulated. The simulated widths of the emission peaks also agree with the experimental results. The simulations of the 2-unit tandem OLEDs shifted the emission to shorter wavelength, in agreement with experimental measurements. The emission spectra's dependence on individual layer thicknesses also agreed well with measurements. Approaches to simulate and improve the light emission intensity from these OLEDs, in particular for white OLEDs, are discussed.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Rana Biswas ; Chun Xu ; Weijun Zhao ; Rui Liu ; Ruth Shinar, et al.
"Simulations of emission from microcavity tandem organic light-emitting diodes", J. Photon. Energy. 1(1), 011016 (March 14, 2011). ; http://dx.doi.org/10.1117/1.3552947


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