Enhanced coupling of light from organic light emitting diodes using nanoporous films

We have demonstrated an approach to enhance the light extraction efficiency for organic light emitting diode $\left(\mathrm{OLED}\right)$ . Nanoporous alumina film was used to modify the optical wave propagation and coupling of light from the $\mathrm{OLED}$ . Experimental results showed an increase of over $50\%$ in the coupling efficiency of the nanoporous device, without affecting the electrical properties of the $\mathrm{OLED}$ . Effective medium theory can be used to model the optical properties of the nanoporous media and simulated the optical characteristics of the $\mathrm{OLED}$ successfully.