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Journal of Photonics for Energy • Open Access

Simulations of emission from microcavity tandem organic light-emitting diodes
Author(s): Rana Biswas; Chun Xu; Weijun Zhao; Rui Liu; Ruth Shinar; Joseph Shinar

Paper Abstract

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.

Paper Details

Date Published: 1 January 2011
PDF: 12 pages
J. Photon. Energy 1(1) 011016 doi: 10.1117/1.3552947
Published in: Journal of Photonics for Energy Volume 1, Issue 1
Show Author Affiliations
Rana Biswas, Iowa State Univ. (United States)
Chun Xu, Iowa State Univ. (United States)
Weijun Zhao, Iowa State Univ. (United States)
Rui Liu, Ames Lab. (United States)
Ruth Shinar, Iowa State Univ. (United States)
Joseph Shinar, Ames Lab. (United States)

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