15 September 2004 Exploring particle-like nanostructures for light outcoupling from organic LEDs by first principles calculations
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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.
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Horst Greiner, Horst Greiner, } "Exploring particle-like nanostructures for light outcoupling from organic LEDs by first principles calculations", Proc. SPIE 5450, Photonic Crystal Materials and Nanostructures, (15 September 2004); doi: 10.1117/12.544802; https://doi.org/10.1117/12.544802

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