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Proceedings Paper

Exploring particle like nanostructures for light outcoupling from organic LEDs by first principles calculations
Author(s): Horst Greiner
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Paper Abstract

Regular arrays of scatterers like cylinders or spheres which resemble 2D photonic crystals can increase light extraction from organic leds. In a recent SPIE publication we have shown that the scattering of the light emitted from a dipole source by such structures can be effectively modelled by an integral equation which kernel is essentially given by the Green’s tensor of the layered medium constituting the organic led. Here we extend the scope of this method by making use of the fact that the matrix-vector products arising from the discretization of the integral equation via the coupled dipole approximation can be calculated by the fast 3D Fourier transform. In this way the iterative solution of linear systems with millions of unknowns becomes feasible and large finite arrays comprising about 10 by 10 particles and more can be effectively treated. After giving an outline of the algorithms we present the results of calculations for large arrays of spheres and cylinders of circular and quadratic cross section. The influence of particle shape, type of array (quadratic, hexagonal) and refractive index on the efficiency of light extraction and angular distribution is studied. We also investigate the effect of random departures of the scattering elements from their ideal lattice positions.

Paper Details

Date Published: 15 September 2004
PDF: 12 pages
Proc. SPIE 5450, Photonic Crystal Materials and Nanostructures, (15 September 2004); doi: 10.1117/12.544802
Show Author Affiliations
Horst Greiner, Philips Research Labs. GmbH (Germany)

Published in SPIE Proceedings Vol. 5450:
Photonic Crystal Materials and Nanostructures
Richard M. De La Rue; Pierre Viktorovitch; Clivia M. Sotomayor Torres; Michele Midrio, Editor(s)

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